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1 टल फ स : Please Contact at elefax mtd@bis.org. in; hmtd@bis.org.in य प च ल लम म स DRAF IN WIDE CIRCULAION रलख रषण स लम /DOCUMEN DESPACH ADVICE एमट ड 4/ट -14, 5, 129, 177, MD 4/-14, 5, 129, 177 dated 07 Oct 2016 प टव इ उ प पवषय सम तउ ए ट ड 04 WROUGH SEEL PRODUCS SECIONAL COMMIEE, MD 04 प) ध उ प म इ ज तमयच ग पवभ ग च ष (ए ट ड स ), प चल खम व ल स य 1) Interested Members of Metallurgical Engineering Division Council, MDC 1)प टव इ उ प पवषय सम तउ ए ट ड 04 प स य 2) All Members of Wrought Steel Products Sectional Committee, MD 04 ग) अ य सभ चल खम व ल तमप य 3) All Others Interested ह य/ ह य,Dear Sir/ Madam, तम ममल खउ रलख स ल म ह: Please find enclosed the following draft standards: रल ख स य /Document No. व षय/ itle 1.रल ख: एमट ड 04 (5363) W2 अउ उ लघ प उ अ प मम इ उ प ल एव त Part 1 प ड फ म ग MD 4 (5363)W2 Cold Reduced Carbon Steel Sheet and Strip Part 1 Cold ए ड र इ ग ( आईएस 513 प स उव म षण) Forming and Drawing Purpose (Seventh Revison of IS 513 ) 2. रल ख: एमट ड 04 (5364) W2 अउ उ लघ प उ अ प मम इ उ प ल एव त Part 2 ह ई टम मसल ए ड उफस ट ल ( MD 4 (5364)W2 आईएस 513 प स उव म षण) Cold Reduced Carbon Steel Sheet and Strip Part 2 High ensile and Multi Phase Steel (Seventh Revision of IS 513) 3. रल ख: एमट ड 04 (5365) W2 ल:ज प यम एव स लम अमभ ण हउ उ उ लउ इ उ प लट MD 4(5365) W2 Hot - ( आईएस 5986 प ल थ म षण) Rolled Steel Flat Products for Structural Forming and Flanging Purposes Specification (Fourth Revision of IS 5986) 4.रल ख: एमट ड 04 (5366) W2 उ उ लउ प मम इ उ ल म एव त (आईएस 1079 प स उव म षण) MD 4(5366) W2 Hot - Rolled Carbon Steel Sheet, Plate and Strip Specification (Seventh Revision of IS 1079)

2 5. रल ख: एमट ड 04 (5367) W2 अउ उ लम रय जम हउ उ उ लउ प मम इ उ प त - पवम टट ( आईएस प स म षण) MD 4(5367) W2 Hot - Rolled Carbon Steel Strip for Cold Rolling Purposes Specification (Second Revision of IS 11513) प य उ रलख प अवल पम प अ म स तउय यह उ उ ह ए भजम, कप यद अ उउ यह रलख ट र य मप प म व प उ ह ज ए, उ इस अ ल प म म आ प यवस य अथव प म य पठम ईय आ सपउ ह: Kindly examine these draft standards and forward your views stating any difficulty which you are likely to experience in your business or profession, if this is finally adopted as National Standard. स तउ प अ उ तउचथ/ Last date for comments: स तउ यद प ई ह उ द ए गए र म मलख प, ऊ मल खउ उ अध ह उ ष प भजम Comments, if any, may please be made in the format given overleaf and mailed to the undersigned at the above address. ध यव, hanking you, भव य, Yours faithfully, (ज.प. ख ) (J.K. Bakhroo) (एमट ड.)Scientist वञ तमप एफ र ख F & H a (MD) mtd@bis.org.in; hmtd@bis.org.in स ल म ऊ मल खउ /Encl: As above

3 Doc: MD 4(5363) FOR COMMENS ONLY Draft Indian Standard COLD REDUCED CARBON SEEL SHEE AND SRIP PAR 1 COLD FORMING AND DRAWING PURPOSE (SEVENH REVISION OF IS 513) Not to be reproduced without the permission of BIS Last date for received of or used as SANDARD comments 07 November 2016 FOREWORD With the constant requirement of greater, stringent and varied requirements for steel sheets and strips for automobile industry and engineering applications, many specifications were made. An endeavour is made by Bureau of Indian Standards to identify, summarize and create a new standard. An attempt is made to cover all such requirements of Automobile and Engineering application under a single standard. However, interested parties as per their requirement may apply more stringent requirement against any clause in this standard or specify other characteristics not covered by this standard. In the present version following modifications are made: a) New designations and grades are added b) Existing standard is divided into two parts, based on the strength level c) Correlation of old designation with new designations and grades has been given for information (Annex A) Assistance has been derived from the following. ISO Cold reduced carbon steel sheet for commercial and drawing qualities EN Cold rolled steel flat products with high yield strength for cold forming JFS A Cold-rolled steel sheet and strip for automobile use JIS G Cold reduced high strength steel sheet and strip with improved formability for automobile structural uses For the purpose of deciding whether a particular requirement of this standard is complied with the final value, observed or calculated, expressing the result of a test or analysis shall be rounded off in accordance with IS2:1960 Rules for rounding off numerical values (revised). he number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. 1 SCOPE his standard covers the requirements of cold reduced carbon steel sheets and strips for cold forming and drawing purposeand where the surface is of prime importance. It covers sheets and strips upto 4.0 mm thick both in coil form and cut lengths. 1

4 2 REFERENCES he following standards contain provisions which through in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below: IS No itle IS 228(Relevant Parts) Method for chemical analysis for steel IS 1501 : 2013 IS 1586:2012 Method for Vickers Hardness est for Metallic Materials (Part 1-4) Method for Rockwell hardness test for metallic material (Part 1-3) IS 1599:2012 IS 8910:2010 Metallic Materials - Bend est Metallic material ensile testing at ambient temperature (third revision) General echnical delivery conditions of steel and steel products IS 10175:2012 Metallic Materials-Sheet And Strip-Erichsen Cupping est IS 11999:2007 Method for determination of plastic strain ratio r for sheet metals IS 1608:2005 IS 15756:2007 IS/ISO 16162:2012 IS: 1956:2006 IS 15262:2002 Metallic Materials Sheet and strip- Determination of tensile strain hardening exponent Cold-Rolled Steel Sheet Products - Dimensional And Shape olerances ( First Revision ) Glossary of terms relating to Iron and steel Part-4 Steel sheet and strip Geometrical Product Specifications (GPS) - Surface exture: Profile Method - erms, Definitions and Surface exture Parameters 3 CLASSIFICAION OF GRADES Sheets and strips shall be classified as per the following groups and designated as per the able Cold Rolled Full Hard Cold rolled full hard steel strips, which can be used in the production of cold rolled annealed steel/galvanized steel/galvannelead steel/any other process/directly used in general engineering purpose. 3.2 General Purpose (CR) Steels which are used in general engineering applications where light bending or forming is required. 3.3 Drawing Quality (C,D,E,F,G) Mild steelswhich are used for the purpose of drawing, where as per the grade, light to critical drawing applications are involved. 2

5 3.4 Interstitial Free-High Strength steel (P) Interstitial free steels having excellent drawing capabilities for cold forming applicability. Strengthening by solid solution hardening. 3.5 Bake Hardening (B) Steels that exhibit increase in proof stress following paint baking treatment. Steel exhibit good drawing capabilities before forming and increase in strength after paint baking process for dent resistant applications. 3.6 Re-Phosphorized (R) Steel exhibit good impact and fatigue strengths. Steels that contain phosphorus to achieve the required strength. 3.7 C,Mn Steel (W) Steel exhibit high strengths with relatively lower yield stress. Steel that is strengthened by the addition of Carbon and Manganese, to achieve the required strength.(minimum tensile strength less than or equal 440 MPa). 4 SUPPLY OF MAERIAL 4.1General requirements relating to the supply of cold rolled carbon steel sheets and strip shall conform to IS Sheets and strips may be supplied either with mill or trimmed edges. 4.3Sheets and strips of CR1 may be supplied in any of following tempers. Sheets and strips of grades other than CR1 shall be supplied in annealed-skin passed or, as agreed between manufacturer and purchaser. emper Designation 1/2 H emper Processing Half Hard 1/4 H 1/8 H Quarter Hard 1/8 Hard Produced by cold rolling followed by annealing and further cold rolling to give strip of intermediate hardness -do- SP Skin Passed Produced by light cold rolling after annealing A Annealed Produced by a final annealing process -do- For specific applications, sheets and strips may also be supplied in any other temper conditions subject to agreement between manufacturer and purchaser. For such temper grades and as annealed conditions, mechanical properties shall be as agreed between manufacturer and purchaser. 3

6 5 NON AGEING CHARACERISICS 5.1he manufacturer shall guarantee the absence of stretcher strains on being cold worked in the case of non-ageing quality with a non ageing guarantee for six months from the date of manufacture ( Date of skin pass), when stored at room temperature. 5.2he manufacturer shall guarantee the absence of stretcher strains on being cold worked in the case of Delayed-ageing quality with a non ageing guarantee for three months from the date of manufacture ( Date of skin pass), when stored at room temperature. 5.3Non ageing characteristics of sheets and strips shall be as per able 2. 6 MANUFACURE 6.1he method of manufacture of steel and subsequent processing for production of steel for sheets and strips shall be left at the discretion of the manufacturer or as agreed between manufacturer and purchaser. 6.2Sheets and strips shall be supplied rimmed, semi-killed or fully killed as agreed between the manufacturer and purchaser.grades which are supplied in delayed ageing and Non ageing guarantee shall be supplied only in fully aluminium killed or in a fully stabilized condition 7 CHEMICAL COMPOSIION 7.1he ladle analysis of steel, when carried out either by the methods specified in relevant parts of IS 228 or any other established international instrumental/chemical method, shall be as given in able 3. In case of any dispute, the procedure given in relevant parts of IS 228 shall be the referee method. 7.2Alternatively, the method specified in relevant ISO standard may be used. 7.3 Product Analysis Permissible variation in the case of product analysis from the limits specified in able 3 shall be as given in able 4. 8 MECHANICAL AND PHYSICAL PROPERIES 8.1 ensile est a) ensile shall be carried out only, if specified by the purchaser; b) ensile test shall be carried out in accordance with IS 1608/ISO 6892; c) When specified, tests shall be carried out in accordance with the relevant Indian standards of test methods and Mechanical properties shall conform to the requirements specified in able 5A, 5B and 5C; d) ensile test values apply to the direction mentioned in able 5A, 5B and 5C. Strips having a width of 250 mm and below shall be tested longitudinally; e) he yield stress values apply to the 0.2 percent proof stress, if the yield stress is not clearly distinctive, otherwise the values apply to the lower yield stress; and f) he values specified in able 5A,5B and 5C are applicable as per the non ageing guarantee mentioned in able 2. 4

7 8.2 Cupping est a) Cupping test shall be applicable only for sheets and strips ofcr2, CR3, CR4 grades having thickness from 0.5 mm upto 2.0 mm; b) Cupping test shall be carried out in accordance with IS 10175, and the minimum Erichson cupping test values shall be as given in Fig.1 Note: he shape of the cup fracture may be as mutually agreed between the manufacturer and purchaser. c) Cupping test is not a mandatory requirement for this standard. he same can be applied with mutual agreement between manufacturer and purchaser. 8.3 Hardness est Cold rolled sheets and strips shall conform to the Hardness requirements specified in able 6, when tested in accordance with IS However, by way of departure from these standards, a visible deformation on the back side of the specimen is permitted. he values determined in this way shall be identified by using symbols HRBm and HR30m, so as to differentiate these from the hardness values determined on thicker products (Which are not allowed to exhibit a visible deformation on the back side of the specimen). If agreed between the manufacturer and purchaser, hardness can be checked by using IS 1501: Method for Vickers hardness test for metallic materialand Resultsas agreed between manufacturer and Purchaser. 8.4 Bend est a) Bend est shall be carried out in accordance with IS 1599; b) he angle of bend and the internal diameter for the different grades of material shall be as given in able 7; c) he axis of the bend shall be in the direction of rolling. he test pieces shall be deemed to have passed the test, if the outer convex surface is free from cracks; and d) Bend test is not a mandatory requirement for this standard. he same can be applied with mutual agreement between manufacturer and purchaser. 8.5 Plastic Strain Ratio (R bar/r-90) a) he plastic strain ratio is an index of drawability (r bar/r-90), shall be applicable only to thickness between 0.50 mm to 2.00 mm. For thickness more than 1.00 mm, r-bar/r-90 value is reduced by and if required, for thickness more than 2.0mm, r-bar/r-90 value to be reduced by 0.20; and b) he plastic strain ratio shall be checked in accordance with IS and results shall conform to as given in able 5A, 5B and 5C. 8.6 ensile Strain Hardening Component (n value) a) he tensile strain hardening is an index of the stretch-ability (n-value/n-90), shall be applicable only to thickness between 0.50 mm and 2.00 mm. If required, for thicknessmore than 2.00 mm, the n-value/n-90 is reduced by 0.02; and b) he tensile strain hardening component shall be checked in accordance with IS andresults shall conform to as given in able 5A, 5B and 5C. 5

8 8.7 Bake Hardening Index (BH) Bake hardening index shall be tested as per Annex B and minimum BH value shall as given inable 5B and 5C. 8.8 Retest If a test does not give the specified results, two additional tests shall be carried out at random on the same lot. Both retests shall conform to the requirements of this standard; otherwise, individual test on each coil, (including any bundle of sheets generated from a single coil) shall meet the requirement otherwise the individual lot shall be rejected. 9 SURFACE FINISH 9.1 Cold Reduced Steel Sheetand Strip his product is normally supplied skin passed (see9.2), but may be supplied annealed last (that is without skin pass), if specified by the purchaser before placing the order. 9.2 Skin Pass he purpose of skin passing is one or more the following: a) o temporarily minimize the appearance of coil breaks, stretcher strains (Luder lines) or fluting during fabrication of finished parts; b) o obtain the required surface finish suitable for ordinary decorative painting; and c) o control the shape. Some increase in hardness and some loss in ductility will result from skin passing. 9.3 Strain Ageing Cold reduced sheet and strip in qualities CR1, CR2, CR3 supplied in skin-passed condition tends to strain age and this may lead to the following: a) Surface markings from stretcher strains (Luder lines) or fluting when the steel is formed; and b) Deterioration in ductility. Because of these factors, it is essential that the period between final processing at the mill and fabrication be kept to minimum. Rotation of stock, by using oldest material first, is important. Stocking of such Sheet and strip for extended periods of time should be avoided; for optimum performance the period should not exceed six weeks. For skin passed sheet and strip in qualities CR1, CR2, CR3and with due regard to foregoing precautions, reasonable freedom can be achieved by effective roller levelling immediately prior to fabrication at the purchaser s plant. Freedom from stretcher strain and fluting for a period of six months or three months can be achieved by the supply of skin passed nonageing steel or delayed ageing steel respectively. Grades of non ageing quality shall be 6

9 specified in such cases, where Luder s lines are not acceptable and where roller levelling is not possible. 9.4 Surface Condition he surface condition of CR0and CR1 grade should be that normally obtained in a cold rolled product. Grades of other quality (that is other than CR0 and CR1) are supplied either of the surface qualities A or B. a) Surface Quality A (Un exposed) - Imperfections such as pores, slight imperfections, small marks, minor scratches and slight colouring, which do not affect the formability or the application of surface coatings are permitted; b) Surface Quality B (Exposed) - he better surface shall be free of imperfections, which might affect the uniform appearance of quality coating. he other surface shall at least conform to surface quality A; c) Unless otherwise agreed, a single surface of the product shall comply with the specified requirements. On Mutual agreement between manufacturer and purchaser, any one of the applicable surface or both the surfaces (For Strip Outside/ Inside surface, For Sheet op/bottom Surface) shall comply with the requirements; and d) he other surface shall be such that during subsequent treatment it does not have a deleterious effect on the better surface. 9.5 Surface Finish a) Cold reduced steel sheet and strip may be supplied in a Bright finish and matt finsh, dull in appearance, which is suitable for ordinary decorative painting but is not recommended for electro plating. Surface roughness may be given subject to mutual agreement between the manufacturer and the purchaser; b) When cold reduced sheet and strip is deformed during fabrication, localized areas may roughen to some degree and such affected portions of the part may require hand finishing to prepare the surface for the intended application; and c) Designation of surface finish shall be as per able Oiling As a deterrent to rusting, a coating of oil is usually applied to the product. he oil is not intended as a drawing or forming lubricant and should be easily removable with degreasing chemicals. he product may be ordered not oiled, if required, in which case, the supplier has no responsibility, if oxidation occurs. For type of oiling, able 9 can be referred (Reference purpose only). 10 FREEDOM FROM DEFECS 10.1he finished sheets and strips shall be reasonably free from harmful defects such as scale, rust, blisters, laminations, pitting, porosity, cracked or torn edges or any other defects which are harmful to the intended use 10.2he degree or amount of surface defects in a strip may be expected to be more than in cut lengths because of the impossibility of rejectingportions of a strip. he purchaser should take 7

10 this into account and the percentage of admissible defects may be agreed at the time of the enquiry and order. 10.3he sheets shall be reasonably flat and edges cleanly sheared and squared to the specified dimensions 11 DIMESNIONS AND OLERANCES 11.1Unless and other wise agreed to between manufacturer and the purchaser, standard dimensions of cold rolled sheets and strips shall be as given below: hickness, mm = 0.08,, 0.12, 0.14, 0.16, 0.18, 0.20, 0.22, 0.25, 0.28, 0.30,0.32, 0.35,0.40, 0.45, 0.50,0.55,0.63, 0.70,0.80,0.90,1.00,1.20,1.25,1.40,1.50,1.60,1.80 and 2.00 he following are the preferred thickness for sheets and strips above 2.00 mm: hickness, mm= 2.50 mm, 2.65 mm, 3.00 mm, 3.25 mm, 3.50 mm, 4.00 mm. 11.2Dimensional and shape tolerances applicable to cold rolled sheets and strip shall be as given in IS/ISO Stricter dimensional tolerances can be agreed between manufacturer and purchaser. 11.3For Untrimmed edges, width tolerances shall be +20/-0 mm and for edges which are trimmed before cold rolled, width tolerances shall be +7/-0 mm. For Edges trimmed after cold rolling and annealing, width tolerances shall be as per IS/ISO 16162: SAMPLING AND ESS 12.1One representative sample from a strip or a lot of sheets shall be taken for tensile testing. A lot consists of 50 tonnes or less of sheets or strips of the same quality rolled to same thickness and processed in same condition. If the lot consists of more than one heat, samples from each heat shall be tested. 12.2For cupping, hardness and bend tests, one sample from each lot of 50 tonnes of same heat or part thereof or one sample from each coil shall be taken. 12.3he specimens shall not undergo any treatment on either surface before testing. In case of strips, samples shall be taken from the beginning or end of the strip. 12.4he centre of each test piece shall be at a quarter widths. When it is not feasible, however the sampling should be made as close to the aforementioned position as possible 13 MARKING 13.1 Marking he following shall be legibly marked or printed on a sticker attached on the top of each bundle of package of sheets /on a tag attached to each coil: a) Manufacturer s name or trade mark; b) Quality designation and grade; c) Product dimensions; 8

11 d) Cast or identification mark by which the sheet or strip may be traced to cast or casts from which they were made; and e) Mass/Net weight BIS Certification Marking he material may also be marked with the standard mark he use of standard mark is governed by the provisions of Bureau of Indian standards Act 1986 and the rules and regulations made there under. he details of conditions under which the licence for the use of standard mark may be granted to manufacturers or producers may be obtained from the bureau of Indian standards Packing a) Each sheet shall be treated on both sides with non-hardening type rust preventive oil, which can be easily washed with aqueous alkali solution; b) Sheets and strips shall preferably be supplied in bundles or packages not more than 3 tonnes or as agreed to between the purchaser and the manufacturer. c) Sheets and strips shall be securely packed in water-resistant material and cover all over with steel envelope and securely tied round with steel straps and preferably with wooden battens underneath to prevent the sheets from rusting and damage during transit. able 1 Designation and Grades Designation (Quality) Cold Rolled (Full Hard) General Purpose Drawing Quality Interstitial Free-High Strength steel Bake Hardening Grade Available Product Range (mm) CR0 CR1 CR2 CR3 CR4 CR5 ISC270C ISC270D ISC270E ISC270F ISC260G ISC340P ISC370P ISC390P ISC440P ISC270B ISC300B ISC320B ISC340B

12 ISC360B ISC390B ISC440B ISC280R ISC320R ISC360R ISC400R ISC340W ISC370W ISC390W ISC440W Re-Phosphorized C,Mn Steel NOES 1 For any thickness greater than or less than the mentioned range, the same can be produced as mutually agreed between manufacturer and purchaser. Acceptance criteria for the range out of available product range shall be as agreed between Purchaser and manufacturer. 2For General Purpose Designation, grade qualities are as follows CR1- Commercial, CR2-Drawing, CR3-Deep Drawing, CR4-Extra Deep drawing, CR5 Extra Deep drawing (Stabilized Interstitial Free). 3 Nomenclature of grade is explained in AnnexC. 10

13 able 2Non Ageing Characteristics Grade Non Ageing Characteristics CR0 CR1 CR2 CR3 CR4 CR5 ISC270C ISC270D ISC270E ISC270F ISC260G ISC340P ISC370P ISC390P ISC440P ISC270B ISC300B ISC320B ISC340B ISC370B ISC400B ISC440B ISC280R ISC320R ISC360R ISC390R ISC340W ISC370W ISC390W ISC440W 8 days 8 days Non Ageing Non Ageing -Delayed Ageing Delayed Ageing Non Ageing Non Ageing Non Ageing Non Ageing Non Ageing Non Ageing Delayed Ageing Delayed Ageing Delayed Ageing Delayed Ageing Delayed Ageing Delayed Ageing Delayed Ageing - NOE: a) () Non ageing guarantee is not applicable b) For grades where non ageing guarantee is not Applicable, type of non-ageing characteristics can be mutually agreed between Manufacturer and Purchaser, before placing the order. 11

14 able 3Chemical Composition Grade CR0 CR1 CR2 CR3 CR4 CR5 ISC270C ISC270D ISC270E ISC270F ISC260G ISC340P ISC370P ISC390P ISC440P ISC270B ISC300B ISC320B ISC340B ISC360B ISC390B ISC440B ISC280R ISC320R ISC360R ISC400R ISC340W ISC370W ISC390W ISC440W Notes: a) b) c) d) e) C (% Max) Mn (% Max) S (% Max) P (% Max) Restricted chemistry can be mutually agreed between purchaser and manufacturer When the steel is Aluminium killed, the total Aluminium content shall not be less than 0.02 percent. When the steel is silicon killed, the silicon content shall not be less than percent. When the steel is Aluminium silicon killed, the silicon content shall not be less than 0.03 percent and total Aluminium content shall not be less than 0.01 percent. (Note: If mutually agreed between purchaser and manufacturer, for aluminium killed steel, aluminium content can be less than 0.02 %) For grades where Non Ageing characteristics are defined, Nitrogen content shall be % Maximum. For grades, where non Ageing characteristics are not defined, Nitrogen content shall be % Maximum. his shall be ensured by the manufacturer by occasional check analysis. he steel can be made with micro alloying elements like Chromium, Nickel,Niobium, Vanadium, itanium, Molybdenum, Boron, Calcium and others, eitheradded individually or in combination,. However in case of boron, the limit shall be % Maximum. Phosphorus limit of 0.12 % Maximum can be added and in such cases, carbon content shall be limited to 0.15 % Maximum. 12

15 able 4 Variation in Product Analysis Element (1) Carbon Manganese Sulphur Phosphorus Silicon Micro Alloy Specified Chemical Composition Limit, Max Variation over Specified Limit Percent, Max (2) 0.15 > >0.60 to 1.15 > > > (3) Subject to negotiation NOE For carbon content less than percent, variation over specified limit can be mutually agreed between purchaser and manufacturer. 13

16 able 5A Mechanical Properties at Room emperature in as Delivered Condition for Annealed&Skin Passed Sheets and strips (Cut lengths and Coils) Designation Grade Yield Point or Proof Stress Mpa (Max) General Purpose CR1 CR2 CR3 CR4 CR Minimum ensile Strength MPa (Max) Minimum Elongation Gauge Length- 80 mm Gauge Length- 50 mm Mean Plastic strain ratio r-bar ensile strain hardening component n-value est Direction 1.3 min 1.4 min 1.7 min 0.16 min 0.19 min 0.22 min Notes for able 5A:-1 N/mm2 = 1 MPa Stricter Mechanical properties requirement may be agreed between Manufacturer and Purchaser, before placing the order. Mechanical properties apply only to skin-passed products he values of yield stress are the 0.2 % proof stress for products which do not represent a marked yield point and the lower yield stress for the others est Piece Direction L : Rolling Direction, est Piece Direction : Perpendicular to rolling direction For hickness upto and less than 0.6 mm, elongation values in the table 5A shall be reduced by 1 r-bar and n-value are only applicable to thickness greater than 0.5 mm. For thickness more than 1.00 mm, r-bar/r-90 value is reduced by.for hickness greater than 2.0 mm, rbar value is reduced by 0.2 and n value reduced by Mechanical properties are not generally tested on CR1 Grade and values mentioned are for information only 9. r-bar and n-values may be modified or excluded from this requirement, by agreement between manufacturer and purchaser. 10. Grade CR1 May be supplied in any of the temper grades as mentioned and mechanical properties (For temper other than Annealed and Skin passed) may not apply and shall be as per mutual agreement between Manufacturer and purchaser before placing of an order. 11. Mechanical properties not applicable for Grade CR0 Which is supplied in as cold rolled condition 12. () Notrequired DRAF FOR IS

17 able 5BMechanical Properties at Room emperature in as Delivered Condition for Annealed andskin Passed Sheets and Strips (Cut lengths and Coils) Elongation % Yield Point or Proof Stress Mpa Grade Minimum ensile Strength MPa Amount of Bake Hardening BH MPa Gauge Length- 50 mm hickness,, mm hickness,, mm < < < < < < < < < < < est Piece Direction Mean Plastic strain ratio r-bar Strain hardening component n-value (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) ISC270C L ISC270D L ISC270E L ISC270F L ISC260G L ISC340P ISC370P ISC390P ISC440P ISC270B L ISC340B ISC440B ISC340W ISC370W ISC390W ISC440W DRAF FOR IS 513 able 5C Mechanical Properties at Room emperature in as Delivered Condition for Annealedand Skin Passed Sheets and Strips (Cut lengths and Coils) 15

18 Elongation % Gauge Length- 80 mm Yield Point or Proof Stress MPa Grade Minimum ensile Strength MPa hickness,, mm hickness,, mm < 0.70 > < 0.70 > 0.70 Amount of Bake Hardening MPa BH est Piece Direction Plastic strain ratio (r-90) Strain hardening component (n-90) (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) ISC300B ISC320B ISC360B ISC390B ISC280R ISC320R ISC360R ISC400R DRAF FOR IS 513 Notes for able 5B & 5C:-1. 1 N/mm2 = 1 MPa = 20 kgf/mm2 2. Stricter Mechanical properties requirement may be agreed between Manufacturer and Purchaser, before placing the order. 3. Mechanical properties apply only to skin-passed products 4. he values of yield stress are the 0.2 % proof stress for products which do not represent a marked yield point and the lower yield stress for the others 5. r-bar/r-90 and n-value/n-90 are only applicable to thickness greater than 0.5 mm. For thickness more than 1.00 mm, r-bar/r-90 value is reduced by For hickness greater than 2.0 mm, r-bar/r-90 value is reduced by 0.2 and n value/n-90 reduced by est Piece Direction L : Rolling Direction, est Piece Direction : Perpendicular to rolling direction 7. Any Additional test may be carried out as per mutual agreement between Manufacturer and Purchaser - Not a mandatory requirement and it can be applied only on mutual agreement. Choice of Properties: Properties are applicable as per hickness range provided in able 5B & 5C. If mutually agreed between Manufacturer and purchaser and properties range (Yield Point or Proof Stress and Elongation ) is not required as per thickness range, then Minimum and Maximum values of the respective grade (Yield Point or Proof Stress and Elongation ), shall be considered as Limits of Yield point or Proof stress and elongation. For Ex: In Grade ISC270C, Properties are not required as per thickness range, then Limits of Yield Point or Proof Stress: MPa and Elongation : %. 10. () Not required

19 able 6Hardness of Grade at Room emperature Grade emper (1) CR0 CR1 CR1 CR1 CR1 CR1 (2) Cold Rolled Full Hard Half Hard(1/2H) Quarter Hard(1/4H) 1/8 Hard(1/8H) Annealed (A) Dead Soft Skin passed Hardness (HRB) Min Max (3) (4) NOE Stricter Hardness ranges can be as agreed between manufacturer and Purchaser. able 7Bend est Minimum ensile Strength (MPa) (1) Bend Angle (2) DRAF FOR IS 513 Bend Radius (3) Close Close Close Close Close NOE For grades, where minimum tensile requirement is not mentioned in the above table, nearest minimum tensile strength value can be applied. For Grade CR1, angle of bend degree is 1800 and bend radius is t (t=thickness) able 8 Surface Finish Surface Finish Class (1) Dull Finish Bright Finish Surface Finish Designation (2) Surface Roughness (µm) (3) D 0.50 Ra 2.00 C B 0.50 Ra 1.20 Ra 0.60µm NOES 1 Surface roughness Ra is the average roughness. 2 Restricted range of surface roughness can be agreed between manufacturer and Purchaser. 3 Unless and other wise mentioned, general condition of surface shall be Dull Finish with surface designation D. 17

20 able 9 ype of Oiling ype of Oiling (1) Normal Rust preventive Oil Special Rust preventive Oil Description (3) (2) High Lubrication rust preventive oil Solid lubricant No Oiling Commonly used for steel strip and sheet for rust prevention For rust prevention and better frictional properties during press work Surface will be dry and prone to oxidation NOE Above table for the purpose of reference only. Fig.1- Minimum Erichsen Values DRAF FOR IS

21 ANNEX A (Foreword) CORRELAION OF OLD AND NEW GRADES/DESIGNAIONS Old Designation New Designation (1) Designation Name CR0 Hard Cold Rolled (Full Hard) CR0 CR1 Commercial General PurposeCommercial CR1 CR2 Drawing General PurposeDrawing CR2 CR3 Deep Drawing General PurposeDeep Drawing CR3 CR4 Extra Deep Drawing CR5 Extra Deep Drawing(Stabilized Interstitial Free) CR5-IF340 CR5-IF390 CR5-IF440 CR5-BH270 CR5-BH320 CR5-BH370 (2) (3) Designation General PurposeExtra Deep Drawing General PurposeExtra Deep Drawing(Stabilized Interstitial Free) DRAF FOR IS 513 Extra Deep Drawing(Stabilized Interstitial Free) Extra Deep Drawing(Stabilized Interstitial Free) Extra Deep Drawing(Stabilized Interstitial Free) Extra Deep Drawing(Stabilized Interstitial Free) Extra Deep Drawing(Stabilized Interstitial Free) Extra Deep Drawing(Stabilized Interstitial Free) (4) Grade CR4 CR5 Interstitial FreeHigh Strength steel ISC340P Interstitial FreeHigh Strength steel ISC390P Interstitial FreeHigh Strength steel ISC440P Bake Hardening ISC270B Bake Hardening ISC320B Bake Hardening ISC370B 19

22 ANNEX B (Clause 8.7) BAKE HARDENING ES he bake hardening index (BH) is the increase in the yield point that is found in the Bake hardening test carried out.bake hardening of steel is achieved during the paint baking treatment. he test procedure for the determination of bake hardening Index is as follows: a. est specimen shall be collected from annealed and skin passed material, which is not supposed to exhibit yield point phenomenon during tensile testing, in the direction mentioned as per able 5B& 5C. ensile specimen to be prepared as per IS 1608 b. Parallel portion area of the test piece shall noted be as A0. c. he test specimen shall be strained to 2 percent tensile elongation. he corresponding force shall be noted as N1. d. he specimen shall beunloaded and heated for 20 minutes at a temperature of 1700C. e. After the heat treatment, the test specimen shall be subjected to tensile testing again. he sharp yield point is expected to appear along with the yield drop phenomenon. he force corresponding to the upper yield point shall be noted as N2 f. DRAF FOR IS 513 he BH value calculationshall be obtained as BH = (N2- N1)/A0 g. BH Value calculation is schematically represented in Figure 2.A &2.B. N2 N1 N1 Force Force 2% Elongation Fig.2.A. Preliminary strain loading Elongation Fig.2.B. After heat treatment 20

23 ANNEX C (able 1 Note 3) NOMENCLAURE OF GRADE ISC340P Designation (Quality) Minimum ensile Strength Cold Rolled Steel Indian Standard DRAF FOR IS

24 Doc: MD 4(5364) FOR COMMENS ONLY Draft Indian Standard COLD REDUCED CARBON SEEL SHEE AND SRIP Part 2High ensile And Multiphase Steel (Second Revision of IS 513) ICS: Not to be reproduced without the permission of Last date for receipt of BIS or used as a Standard comments is: FOREWORD With the constant requirement of greater, stringent and varied requirements for steel sheets and strips for automobile industry and engineering applications, many specifications were made. An endeavour is made by Bureau of Indian Standards to identify, summarize and create a new standard. An attempt is made to cover all such requirements of Automobile and Engineering application under a single standard. However, interested parties as per their requirement may apply more stringent requirement against any clause in this standard or specify other characteristics not covered by this standard. In the present version following modifications are made: a) New designations and grades are added; and b) Existing standard is divided into two parts, based on the strength level. Assistance has been derived from the following: EN Cold rolled steel flat products with high yield strength for cold forming a) EN Hot rolled and cold rolled non-coated products of multiphase steels for cold forming - echnical delivery conditions b) JFS A Cold-rolled steel sheet and strip for automobile use c) JIS G Cold reduced high strength steel sheet and strip with improved formability for automobile structural uses. For the purpose of deciding whether a particular requirement of this standard is complied with the final value, observed or calculated, expressing the result of a test or analysis shall be rounded off in accordance with IS2:1960 Rules for rounding off numerical values (revised). he number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. 1

25 1 SCOPE his standard covers the requirements of cold reduced carbon high tensile and multi-phase steel sheets and strips for forming and where the surface is of prime importance. It covers sheets and strips up to3.0 mm thick both in coil form and cut lengths. 2 REFERENCES he following standards contain provisions which through in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below: IS No IS 228(Relevant Parts) IS 1501 : 2013 IS 1586:2012 IS 1599:2012 IS 1608:2005 IS 8910:2010 IS 11999:2007 IS 15756:2007 IS/ISO 16162:2012 IS: 1956:2006 IS 15262:2002 itle Method for chemical analysis for steel Method for Vickers Hardness est for Metallic Materials (Part 14) Method for Rockwell hardness test for metallic material (Part 13) Method of bend test (Second revision) Metallic material ensile testing at ambient temperature (third revision) General echnical delivery conditions of steel and steel products Method for determination of plastic strain ratio r for sheet metals Metallic Materials Sheet and strip- Determination of tensile strain hardening exponent Cold-Rolled Steel Sheet Products - Dimensional And Shape olerances ( First Revision ) Glossary of terms relating to Iron and steel Part-4 Steel sheet and strip Geometrical Product Specifications (GPS) - Surface exture: Profile Method - erms, Definitions and Surface exture Parameters 3 CLASSIFICAION OF GRADES Sheets and strips shall be classified as per the following groups and designated as per the able High Strength Low Alloy(LA) Steel exhibit good impact and fatigue strengths. Steels that contain micro alloy additions to achieve the required strength. 3.2 C,Mn Steel (W) Steel exhibit high strengths with relatively lower yield stress. Steel that is strengthened by the addition of Carbon and Manganese, to achieve the required strength.(minimum ensile strength greater than 440 MPa). 2

26 3.3 Dual Phase Steel (Y) Steel with very high tensile strengths and low yield ratio. Steels are strengthened with a microstructure of ferrite and martensite, created by a suitable heat treatment. 3.4 RIP Steel () ransformation induced plasticity. Steel exhibit outstanding combination of high strength and ductility. Steels that are strengthened by retained austenite obtained by suitable heat treatment which transforms into martensite due to application of higher strain. 3.5 Complex Phase (C) Steel exhibit very high tensile strength with high yield stress and also good elongation. Steels are strengthened with a microstructure of different phases and extreme fine grain refinement. 3.6 Martensitic Steel (M) Steel exhibit very high tensile strengthand yield stress and are strengthened with high amount of martensite. 3.7 Hot forming grades (HF) Steel exhibit very high tensile properties, which are obtained through a process of hot forming and subsequent suitable quenching method. 4 SUPPLY OF MAERIAL 4.1General requirements relating to the supply of cold rolled low carbon steel sheets and strip conform to IS Sheets and strips may be supplied either with mill or trimmed edges. 5 MANUFACURE 5.1he method of manufacture of steel and subsequent processing for production of steel sheet and strips shall be left at the discretion of the manufacturer or as agreed between manufacturer and purchaser. 5.2Sheets and strips shall be supplied rimmed, semi-killed or killed as agreed between the manufacturer and purchaser. 6 CHEMICAL COMPOSIION a. he ladle analysis of steel, when carried out either by the methods specified in relevant parts of IS 228 or any other established international instrumental/chemical method, shall be as 3

27 b. c. given in able 3. In case of any dispute, the procedure given in relevant parts of IS 228 shall be the referee method. Alternatively, the method specified in relevant ISO standard may be used. Product Analysis Permissible variation in the case of product analysis from the limits specified in able 2 shall be as given in able 3. 7 MECHANICAL AND PHYSICAL PROPERIES 7.1 ensile est a) b) c) ensile shall be carried out only, if specified by the purchaser; ensile test shall be carried out in accordance with IS 1608/ISO 6892; When specified, tests shall be carried out in accordance with the relevant Indian Standards of test methods and Mechanical properties shall conform to the requirements d) e) specified in able 4A and4b; ensile test values apply to the direction mentioned in able 4A and4b; and he yield stress values apply to the 0.2 percent proof stress, if the yield stress is not clearly distinctive, otherwise the values apply to the lower yield stress. 7.2 Bend est a) b) Bend est shall be carried out n accordance with IS 1599; he angle of bend and the internal diameter for the different grades of material shall be as given in able 5; c) he axis of the bend shall be in the direction of rolling. he test pieces shall be deemed to have passed the test if the outer convex surface is free from cracks; and d) Bend test is not a mandatory requirement for this standard. he same can be applied with mutual agreement between manufacturer and purchaser. 7.3 ensile Strain Hardening Component n Value a) applicable he tensile strain hardening is an index of the stretch-ability (n-90), shall be only to thickness between 0.50 mm and 2.00 mm. For thickness more than 2.00 mm, the n-value is reduced by 0.02; and b) he tensile strain hardening component shall accordance with IS and results shallconform to as given in able 4A and4b. 7.4 Retest If a test does not give the specified results, two additional tests shall be carried out at random on the same lot. Both retests shall conform to the requirements of this standard; otherwise individual test on each coil, (including any bundle of sheets generated from a single coil) shall meet the requirement otherwise the individual lot shall be rejected. 8 SURFACE FINISH 4

28 8.1 Cold Reduced Steel Sheet and Strip his product is normally supplied skin passed (see 8.2), but may be supplied annealed last (that is without skin pass), if specified by the purchaser before placing the order. 8.2 Skin Pass he purpose of skin passing is one or more the following: a) o temporarily minimize the appearance of coil breaks, stretcher strains (Luder lines) or fluting during fabrication of finished parts; b) o obtain the required surface finish suitable for ordinary decorative painting; and c) o control the shape. Some increase in hardness and some loss in ductility will result from skin passing. 8.3 Strain Ageing Because of strain ageing factors, it is essential that the period of final processing at the mill and fabrication be kept to minimum. Rotation of stock, by using oldest material first, is important. Stocking of such steels for extended periods of time should be avoided; for optimum performance the period should not exceed six weeks. 8.4 Surface Condition Grades are supplied either of the surface qualities A or B. a) Surface Quality A (Un exposed) - Imperfections such as pores, slight imperfections, small marks, minor scratches and slight colouring, which do not affect the formability or the application of surface coatings are permitted; b) Surface Quality B (Exposed) - he better surface shall be free of imperfections, which might affect the uniform appearance of quality coating. he other surface shall at least conform to surface quality A; c) Unless otherwise agreed, a single surface of the product shall comply with the specified requirements. On Mutual agreement between manufacturer and purchaser, any one of the applicable surface or both the surfaces (For Strip Outside/ Inside surface, For Sheet op/bottom Surface) shall comply with the requirements; d) he other surface shall be such that during subsequent treatment it does not have a deleterious effect on the better surface; and e) Grades of this part of the standard are generally supplied in Surface quality A. 5

29 8.5 Surface Finish a) Cold reduced steel sheet and strip may be supplied in a Bright finish and matt finsh, dull in appearance, which is suitable for ordinary decorative painting but is not recommended for electro plating. Surface roughness may be given subject to mutual agreement between the manufacturer and the purchaser; b) When cold reduced sheet and strip is deformed during fabrication, localized areas may roughen to some degree and such affect portions of the part may require hand finishing to prepare the surface for the intended application; and c) Designation of surface finish shall be as per able Oiling As a deterrent to rusting, a coating of oil is usually applied to the product. he oil is not intended as a drawing or forming lubricant and should be easily removable with degreasing chemicals. he product may be ordered not oiled, if required, in which case, the supplier has no responsibility, if oxidation occurs. For type of oiling, able 7 can be referred (Reference purpose only). 9 FREEDOM FROM DEFECS 9.1he finished sheets and strips shall be reasonably free from harmful defects such as scale, rust, blisters, laminations, pitting, porosity, cracked or torn edges or any other defects which are harmful to the intended use 9.2he degree or amount of surface defects in a strip may be expected to be more than in cut lengths because of the impossibility of rejecting portions of a strip. he purchaser should take this into account and the percentage of admissible defects may be agreed at the time of the enquiry and order. 9.3he sheets shall be reasonably flat and edges cleanly sheared and squared to the specified dimensions 10 DIMESNIONS AND OLERANCES 10.1Unless and other wise agreed to between manufacturer and the purchaser, standard dimensions of cold rolled sheets and strips shall be as given below: hickness, mm = 0.40, 0.45, 0.50,0.55,0.63, 0.70,0.80,0.90,1.00,1.20,1.25,1.40,1.50,1.60,1.80 and 2.00 he following are the preferred thickness for sheets above 2.00 mm: hickness, mm= 2.50 mm, 2.65 mm, 3.00 mm. 10.2Dimensional and shape tolerances applicable to cold rolled sheets and strip shall be as given in IS/ISO Stricter dimensional tolerances can be agreed between manufacturer and purchaser. 10.3For Untrimmed edges, width tolerances shall be +20/-0 mm and for edges which are trimmed before cold rolling, width tolerances shall be +7/-0 mm. For Edges trimmed after cold rolling and annealing, width tolerances shall be as per IS/ISO

30 11 SAMPLING AND ESS 11.1One representative sample from a strip or a lot of sheets shall be taken for tensile testing. A lot consists of 50 tonnes or less of sheets or strips of the same quality rolled to same thickness and processed in same condition. If the lot consists of more than one heat, samples from each heat shall be tested. 11.2For bend tests, one sample each lot of 50 tonnes of same heat or part thereof or one sample from each coil shall be taken 11.3he specimens shall not undergo any treatment on either surface before testing. In case of strips, samples shall be taken from the beginning or end of the strip. 11.4he centre of each test piece shall be at a quarter widths. When it is not feasible, however the sampling should be made as close to the aforementioned position as possible. 12 MARKING 12.1 Marking he following shall be legibly marked or printed on a sticker attached on the top of each bundle of package of sheets /on a tag attached to each coil: Manufacturer s name or trade mark; Quality designation and grade; Product dimensions; Cast or identification mark by which the sheet or strip may be traced to cast or casts from which they were made; and e) Mass/Net weight. a) b) c) d) 12.2 BIS Certification Marking he material may also be marked with the standard mark.he use of standard mark is governed by the provisions of Bureau of Indian standards Act 1986 and the rules and regulations made there under. he details of conditions under which the licence for the use of standard mark may be granted to manufacturers or producers may be obtained from the bureau of Indian standards Packing a) Each sheet shall be treated on both sides with non-hardening type rust preventive oil, which can be easily washed with aqueous alkali solution; b) Sheets and strips shall preferably be supplied in bundles or packages not weighing more than 3 tonnes or as agreed to between the purchaser and the manufacturer; and c) Sheets and strips shall be securely packed in water resistant material and cover all over with steel envelope and securely tied round with steel straps and preferably with wooden battens underneath to prevent the sheets from rusting and damage during transit. 7