Draft Indian Standard Galvanized Steel Sheets (Plain and Corrugated)- Specification (Seventh Revision of IS 277) ICS

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1 FOR BIS Use Only Doc: No. MTD 4 (5207) Draft Indian Standard Galvanized Steel Sheets (Plain and Corrugated)- Specification (Seventh Revision of IS 277) ICS Not be reproduced without the permission of Last date for receipt of BIS or used as STANDARD comments is 31 Jan FOREWORD In this revision, following changes have been made: a) Amendments number 1, 2, 3 and 4 have been incorporated. b) Table 1 and Table 2 have been modified. c) Clauses 2, 5, 7, 8, 9 and 15.1 have been modified. d) 5 new grades of structural steel have been included. For all tests specified in this standard (chemical/physical/others), the method as specified in relevant ISO standard may also be followed as an alternate method. While revising the standard, assistance has been derived from ISO 3575:2011 Continuous hot-dip zinc-coated carbon steel sheet of commercial and drawing qualities. For the purpose of deciding whether 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 IS 2: 1960 `Rules for rounding off numerical values (revised). The 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 1.1 This draft standard covers the requirements of plain galvanized steel sheets and strips (coils) and corrugated galvanized sheets. 1.2 Galvanized steel sheets covered by this standard are intended be used for purposes such as paneling, roofing, applications requiring lock forming etc. 1.3 Requirements of galvannealed and electrogalvanized steel are not covered in this standard. 2 REFERENCES The following standards contain provisions which through reference in this text, constitute provisions of this draft standard. At the time of publication, the editions indicated were valid. All standards are subject revision and parties agreement based on this standard are encouraged investigate the possibility of applying the most recent editions of the standards indicated below: IS No. Title 209:1992 Zinc ingot -Specification (fourth revision) 513:2008 Cold-rolled low carbon steel sheets and strips (fourth revision) 875 (Part 2):1987 Code of practice for design loads (other than earthquake) for buildings and structures: Part 2 Imposed loads (second revision) 1079:2009 Hot-rolled carbon steel sheet and strip (sixth revision) 1956 (Part 4):1975 Glossary of terms relating iron and steel - Part 4 Steel sheet and strip (first revision) 2629:1985 Recommended practice for hot dip galvanizing on iron and steel (first revision) 3

2 6745:1972 Method for determination of mass of zinc coating on zinc coated iron and steel articles 8910:2010 General technical delivery requirements for steel and steel products (first revision) 13229:1991 Zinc for galvanizing IS/ISO 16163:2005 Continuously hot dipped coated steel steel products-dimensional and shape lerances 1608:2005 Metallic Materials- Tensile testing at ambient temperature (third revision) 3 TERMINOLOGY 3.1 For the purpose of this standard, the definition given in IS 1956 (Part 4) and the following shall apply. 3.2 Black Sheet Hot rolled steel sheet prior pickling operation. 3.3 Cold Rolled Sheet or Coil Cold-rolled sheet or coil prior continuous galvanizing process. 3.4 Thickness of Sheet Thickness of hot-rolled or cold-rolled sheet in cut length or coil form. 3.5 Normal Spangle (N) : This finish is obtained when Zinc Coating is left solidify normally. Zinc crystals of different sizes and brightness appear depending on the galvanizing conditions. The quality of the coating is not affected by this. 3.6 Minimized Spangle (M) : This finish is obtained by influencing the solidification process in a specific way. The surface will have reduced spangles, in some cases, not visible the unaided eye. This finish may be ordered if the normal spangle does not satisfy the surface appearance requirements. 4 SUPPLY OF MATERIAL The general requirements relating the supply of galvanized sheets and strips shall conform IS MANUFACTURE 5.1 The base steel chemistry of galvanized sheets and coils shall be as per Table 1. S. No. Designation Grade Table : 1 Chemical Composition (Clause 5.1) C Max Mn Max S Max P Max Ti Max (1) (2) (3) (4) (5) (6) (7) (8) i) GP Ordinary ii) GPH Ordinary-Hard iii) GC Corrugated ordinary iv) GPL Drawing (Lock Forming) v) GPD Deep drawing vi) GPED Extra deep drawing vii) GPIF Interstitial free (Stabilized) viii) GP250 Structural Steel Grade ix) GP275 Structural Steel Grade x) GP350 Class-1 Structural Steel Grade 350 Class xi) GP350 Class-2 Structural Steel Grade 350 Class xii) GP550 Structural Steel Grade NOTES : 1. Restricted chemistry for S. No. v) and vi) may be mutually agreed between purchaser and the supplier. 4

3 S. No. 2. When steel is killed by aluminium alone the tal aluminium content should be %. When steel is Silicon killed, the Silicon content shall not be less than 0.1%. When the steel is Al-Si killed then Silicon content shall not be less than 0.03% and tal aluminium content shall not be less than 0.01%. 3. The Nitrogen content of the steel shall not be more than 0.007%. However for S. No i), ii). iii), iv) the Nitrogen content shall not exceed 0.012%. This shall be ensured by the manufacturer by occasional check analysis. 4. The material may be supplied in the copper bearing quality in which case the copper shall be between 0.20 and 0.35% on Ladle analysis. In case of product analysis, the copper content shall be permissible in between 0.17 and 0.38%. 5. The steel can be made with micro alloying element like Niobium, Vanadium, Titanium and Boron either individually or in combination, on mutual agreement in which case the tal micro alloying element should not exceed 0.2% in ladle analysis. However, in case of Boron the limit shall be 0.006%. 6. The Titanium may be replaced tally or partially by Niobium or Vanadium and may be completely stabilized When it is not possible test the base metal before galvanizing, the base metal may be tested after stripping off the zinc coating. 5.2 Galvanizing shall be carried out by first pickling and/ or by cleaning the base steel and then dipping in a bath of molten zinc at a temperature suitable produce a complete and uniformly adhesive zinc coating (refer IS 2629). The zinc ingots used for galvanizing shall conform any of the grades specified in IS 209 or IS Passivation and/or oiling shall be carried out on the surface, as agreed between the purchaser and manufacturer. 5.4 Spangle type (N or M), surface quality (7.7) and surface treatment (7.8) may be agreed at the time of placing the order. 6 MECHANICAL PROPERTIES The mechanical properties of base steel, after galvanizing shall be as per Table 2. Designation Quality Name Table 2 Mechanical Properties (Clause 6) Yield Stress Tensile R e Strength MPa R m MPa Elongation, Percent A Min L o=80 mm L o=50 mm (1) (2) (3) (4) (5) (6) (7) i) GP Ordinary ii) GPH Ordinary-Hard 400 Min iii) GC Corrugated ordinary iv) GPL Drawing (Lock 350 Max 450 Max Forming) v) GPD Deep drawing 280 Max 430 Max vi) GPED Extra deep drawing 260 Max 430 Max vii) GPIF Interstitial free 240 Max 370 Max (Stabilized) viii) GP250 Structural Steel 250 Min 360 Min Grade 250 ix) GP275 Structural Steel 275 Min 380 Min Grade 275 x) GP350 Structural Steel 350 Min 450 Min Class-1 Grade 350 Class-1 xi) GP350 Structural Steel 350 Min Class-2 Grade 350 Class-2 xii) GP550 Structural Steel Grade Min 570 Min NOTE: Elongation values shall be reduced by 4 units for thickness values 0.5 mm and lower and shall be reduced by 2 units for thickness value above 0.5 mm up 0.7 mm. 5

4 7 ZINC COATING 7.1 The zinc coating shall conform the requirement of any one of the class prescribed in Table The zinc coating mass shall conform the requirement of any of the class prescribed in Table 3. The mass of coating referred in this standard shall represent the tal mass of zinc, both sides inclusive. 7.3 Any other mass of coating, than those specified in Table 3, may be supplied, if agreed between the purchaser and the manufacturer. 7.4 In addition X-ray fluorescence method (on line/off line) can also be used for the same. Table 3 Mass of Coating (Total Both Sides) (Clauses 7.1, 7.2, 7.3 and 9.2) Sl. No Class of Coating Minimum Average Coating Triple Spot Test g/ m 2 Minimum Coating Single Spot Test a) g/ m 2 (1) (2) (3) (4) i) ii) iii) iv) v) vi) vii) viii) a) Minimum individual value obtained in triple spot test. NOTE - The recommended base steel thickness for roofing application is 0.63 mm and corresponding recommended grade of coating shall be minimum 275 g/m If agreed between the purchaser and manufacturer, the grade of coating 100 and 80 may be used for non-critical applications other than roofing. The mass of coating in such cases shall be as given in Table 4. Table 4 Mass of Coating (Clause 7.5) Class of Coating Minimum Average Coating Triple Spot Test g/m 2 6 Minimum Coating Single Spot Test g/m 2 (1) (2) (3) NOTE For the above grade of coating, the mandrel diameter for bend test for adhesion of zinc coating shall be subject mutual agreement between the purchaser and the manufacturer. 7.6 For product 600 mm in width and narrower, only one test specimen is required. Specimens shall be taken at least 10 mm away from strip/sheet edge.

5 7.7 Surface Quality : As Coated Surface (A) : Imperfections such as Pimples, Marks, Scratches, Pits, Variation in surface appearance, Dark spots, Strip marks, and slight Passivation marks are permissible. Stretch leveling marks may appear Improved Surface (B) : This surface quality is obtained by skin passing. With this surface quality, small imperfections such as stretch leveling marks, skin pass marks, run-off marks, slight passivation stains are permissible Best Quality Surface (C) : Surface quality C is obtained by skin passing. The controlled surface shall make it possible apply a uniform high class paint finish. 7.8 Surface Treatment (Surface Protection) : Hot Dip galvanized steel shall be supplied with one of the following surface treatments. The period of protection afforded is limited and depends on the atmospheric and srage conditions. Chemical Passivation Oiling Chemical Passivation & Oiling C O CO Chemical Passivation (C): Chemical passivation protects the surface against humidity and reduces the risk of formation of corrosion product during srage and transportation. Local color variation as a result of this treatment is permissible and does not impair the quality Oiling (O): This treatment also reduces the risk of formation of corrosion products. It shall be possible remove the oil layer with suitable degreasing solvent which does not adversely affect the coating Chemical Passivation & Oiling (CO): Agreement may be reached this combination of treatment in accordance with and if increased protection against the formation of corrosion products. 8 MECHANICAL TESTING 8.1 Tensile Test Tensile test shall be carried out only, if specified by the purchaser When specified, the tensile test shall be carried out in accordance with IS 1608 as applicable, and the values of tensile strength, yield stress and percentage elongation shall conform the requirements specified in Table Tensile test values apply transverse specimen in case of sheet/strips. Transverse test piece shall be taken midway between the centre and the edge of the sheet/strip as-rolled The yield strength values apply the 0.2 percent proof stress, if the yield strength is not clearly distinctive, the values apply lower yield strength. 8.2 Bend Test Test Samples Bend test for the purpose of conformity shall be carried out at the rate of one set of 2 samples for every 1000 plain sheets or part thereof. However, bend test shall not be applicable GPH, GC and GP550 grades One bend test shall be conducted for every coil For bend test, the test piece shall be 230 mm long and 75 mm 100 mm wide cut across the direction of rolling. 7

6 Specimens for bend tests shall be free from burrs. Filling or machining remove burrs is permitted. Cracks of the base metal developing at the edge of the specimen or coarse grain developing at the line of the bend shall be disregarded. 8.3 Requirements Samples of galvanized steel sheets selected as described in shall withstand bending through 180 around a mandrel having diameter specified in Table 5 without peeling or flaking of zinc coating. Crack or fracture of base metal, except those indicated in , shall not be permitted. Table 5 Mandrel Diameter for Bend Test (Clause 8.3) (All dimensions in millimeter) Sl. No. Class of Coating Diameter 1) of Mandrel for Thickness of Sheet (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) i) ii) iii) iv) v) vi) vii) viii) ) Expressed as number of times the thickness of strip/sheet. 9 COATING TEST 9.1 Test Samples One set of three samples each 50 mm X 50 mm or 50 mm diameter, shall be selected at random from one sheet for every galvanized sheets or part thereof. For Single spot and triple spot tests, the test method given in IS 6745 shall be followed In case of galvanized sheet supplied in coils, one set of 3 samples, each 50 mm X 50 mm or 50 mm diameter, shall be selected from one end of each coil across the width. 9.2 Determination of Mass of Zinc Coating The average masses of zinc coating of samples as selected under 9.1 and determined by the method given in IS 6745 or by any other established instrument or chemical method shall conform both the values specified in Table RETESTS 10.1 If any test sample fails meet test requirements given in 8 and 9.2, two more set of test samples shall be taken for the specific test requirements from the same lot If any of the retest sample fails meet the requirements of this standard, the entire batch of the sheets represented by the sample shall be deemed as not conforming the standard. 8

7 11 FREEDOM FROM DEFECTS 11.1 Galvanized plain sheets, corrugated sheets and coils shall be reasonably flat and free from bare spots, pin holes, tears and other harmful defects. However, imperfections such as rough/non uniform coating, minor dents, water/passivation marks etc. may be present at certain portions which are not harmful for intended use Coils, however, may contain some abnormal imperfections which render a portion of the coil unusable since the imperfections in the coil cannot be removed as in the case with cut length. 12 MASS 12.1 Mass of sheets and coils shall be given in kg. of actual or calculated mass The mass of sheets and coils shall be calculated as given in Table 6 on the basis of nominal dimensions and mass of zinc coating. Table 6 Calculation of Mass of Sheets or Coils (Clause 12.2) Sl. Type of Order of Calculation Methods of Calculations Number of No. Material Numerals in Resultant Value (1) (2) (3) (4) (5) i) Sheet Mass of single sheet Nominal mass of single Round off 4 sheet plus mass of zinc effective coating figures Total mass Mass of single sheet (kg) x Rounded off Number of sheets integral value of kg ii) Coil Unit mass of coil Unit mass of sheet(kg/m 2 ) x Rounded off width (mm) x effective figures Mass of single Coil Unit mass of coil (kg/m) x - Length (m) Total mass (kg) Total mass of each coil Integral Number of kg NOTES 1) Nominal mass of single sheet shall be calculated by calculating the volume of the sheet and multiplying the same with density of sheet (density 7.85 g/cm 3 ) and rounding the same 4 effective figures. 2) Mass of the coating shall be calculated by multiplying the surface area of the single sheet with indicated nominal coating mass (g/m 2 ) as shown for triple spot test (see Table 3). 3) For calculation of corrugated sheet mass, the width before corrugation considered while calculating the area. 13 DIMENSIONS AND TOLERANCES OF PLAIN SHEETS/COILS 13.1 Sizes of Plain Sheets The plain sheets shall be supplied in any combination of the following lengths, widths and thickness: a) Length , 2 200, 2 500, and mm b) Width - 750, 900, and mm c) Thickness , 0.12, 0.14, 0.16, 0.18, 0.22, 0.25, 0.28, 0.32, 0.40, 0.45, (uncoated sheets) 0.50, 0.55, 0.63, 0.70, 0.80, 0.90, 1.00, and 1.60 mm NOTE Sheets for other sizes (length, width and thickness) may also be supplied subject the mutual agreement between the purchaser and the manufacturer. 9

8 13.2 Tolerance Length No sheet shall be smaller in length than that specified. Tolerances on length on plus side shall be 15 mm or 0.5 percent of length whichever is greater The diagonal distance between opposite corners of any sheet shall not differ by more than 20 mm Width No plain sheet shall be smaller in width than that specified. The positive lerances on width shall be 10 mm Thickness The lerance on thickness of sheet and coil shall be according IS 513, IS 1079, IS or as applicable Tolerance on Mass The lerance on mass of individual sheets calculated in accordance with 12.2 shall be within + 10 percent and lerance on mass of each bundle of sheet shall be + 5 percent. 14 DIMENSIONS AND TOLERANCES OF CORRUGATED SHEETS 14.1 Sizes of Corrugated Sheets Length The length of the corrugated sheets shall be as follows : 1 800, 2 200, 2 500, 2 800, and mm. NOTE Sheets of other lengths may also be supplied subject the mutual agreement between the purchaser and the manufacturer Depth and Pitch of the Corrugations The depth and pitch of the corrugation shall be as follows: Table 7 (Clause ) Type Depth of Corrugation mm Pitch of Corrugation mm A B C D NOTE : On agreement between the purchaser and the manufacturer sheets of other profile, depth and pitch of corrugation may also be supplied subject fulfillment of required condition for imposed load on roofs as per 4.2 of IS 375 (Part 2) : Number of Corrugations The number of corrugations shall be 8, 10, 11, 12, 13 and 14 depending on the width of the sheet The overall width of the corrugated sheets before and after corrugation shall be as shown in Table Sheets of sizes and corrugation patterns other than those specified above may be supplied, if agreed by the purchaser and manufacturer. 10

9 Sl. No. Table 8 all Width and Corrugation of Sheets (Clause ) No. of Type all Width of Sheet Corrugation Before Corrugation (mm) After Corrugation (mm) (1) (2) (3) (4) (5) i) 8 A ii) 10 A iii) 11 A iv) 13 A v) 14 A vi) 16 A vii) 18 A viii) 20 A ix) 8 B x) 10 B xi) 11 B xii) 13 B xiii) 16 B xiv) 18 B xv) 20 B xvi) 10 C xvii) 12 D Tolerances The lerances on dimensions of corrugated sheet shall be as given in Table 9. Table 9 Tolerance on Dimension of Corrugated Sheets (Clause ) Sl. No. Dimensions Tolerance 1) (1) (2) (3) i) Depth of corrugation ± 2.5 mm ii) Pitch of corrugation ± 5 mm iii) all width after corrugation ± 25 mm 1) Average of 4 measurements. 15 MARKING 15.1 Manufacturer s name or trade-mark, class of coating, length, width thickness and number of corrugations, type in case of corrugated sheets and material identification (steel grade, surface quality, etc) shall be marked legibly on each sheet or shown on a tag attached each bundle BIS Certification Marking The material may also be marked with the Standard Mark The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 1986 and the Rules and Regulations made thereunder. The details of conditions under which the license for the use of the Standard Mark may be granted manufacturers or producers may be obtained from the Bureau of Indian Standards. 11

10 FORMAT FOR SENDING COMMENTS ON BIS DOCUMENTS NAME OF THE COMMENTATOR / ORGANIZATION : Doc. Number and Title : Sl.No. Clause / Subclause / Comments / Suggestions Para No. commented (1) (2) (3)

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