For Public Comment DRAFT MALAYSIAN STANDARD. Alloyed spring steels - Specification 15P004R0. Copyright 2016 DEPARTMENT OF STANDARDS MALAYSIA

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1 DRAFT MALAYSIAN STANDARD 15P004R0 STAGE : PUBLIC COMMENT (40.20) DATE : 01/02/ /04/2016 Alloyed spring steels - Specification OFFICER/SUPPORT STAFF: (NI/siti) ICS: Descriprs: steel, spring steel Copyright 2016 DEPARTMENT OF STANDARDS MALAYSIA

2 Contents Page Committee representation... ii Foreword... iii 1 Scope Normative references Designation of grade Method of manufacture Chemical composition Appearance, shape, dimensions and lerances Decarburisation Tests Inspection Marking Report STANDARDS MALAYSIA All rights reserved i

3 Committee representation The Industry Standards Committee on Metallic Materials and Semi-Finished Products (ISC P) under whose authority this Malaysian Standard was developed, comprises representatives from the following organisations: Association of Consulting Engineers Malaysia Association of Marine Industries of Malaysia Construction Industry Development Board Malaysia Department of Standards Malaysia Federation of Malaysian Manufacturers IKRAM QA Services Sdn Bhd Institute of Materials Malaysia Jabatan Kerja Raya Malaysia Malaysia Steel Association Malaysia Steel Institute Malaysian Iron and Steel Industry Federation Master Builders Association Malaysia Ministry of International Trade and Industry Pertubuhan Akitek Malaysia SIRIM Berhad (National Centre for Machinery and Tooling Technology) SIRIM Berhad (National Precision Tooling (M) Sdn Bhd) SIRIM Berhad (Secretariat) SIRIM QAS International Sdn Bhd The Institution of Engineers, Malaysia Universiti Malaya Universiti Sains Malaysia Universiti Teknologi Malaysia The Technical Committee on Alloy Steels which developed this Malaysian Standard consist of representatives from the following organisations: Amsteel Mills Sdn Bhd Ann Joo Steel Berhad BlueScope Steel (Malaysia) Sdn. Bhd IKRAM QA Services Sdn Bhd Kanzen Tetsu Group Malaysian Iron and Steel Industry Federation SIRIM Berhad (Secretariat) SIRIM QAS International Sdn Bhd (Testing Services Department - Civil and Construction Section) SIRIM QAS International Sdn Bhd (Testing Services Department - Technical and Calibration Section) SKF Bearing Industries (M) Sdn Bhd Southern Steel Berhad SuperInox Pipe Industry Sdn Bhd Universiti Islam Antarabangsa Malaysia Universiti Kebangsaan Malaysia Universiti Sains Malaysia Co-opted member: Malaysia Steel Institute ii STANDARDS MALAYSIA All rights reserved

4 Foreword This Malaysian Standard was developed by the Technical Committee on Alloy Steels under the authority of the Industry Standards Committee on Metallic Materials and Semi-Finished Products. Compliance with a Malaysian Standard does not itself confer immunity from legal obligations. STANDARDS MALAYSIA All rights reserved iii

5 Alloyed spring steels - Specification 1 Scope This Malaysian Standard specifies the alloyed spring steels (hereafter referred as steels ) mainly used for the hot-formed springs such as the laminated springs, coiled springs and rsion bar springs. 2 Normative references The following normative references are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the normative reference (including any amendments) applies. MS 1846, Steel and steel products - General technical delivery requirements (First revision) MS 2247:2009 (P), Carbon steels for machine structural use MS ISO , Metallic materials -- Brinell hardness test -- Part 2: Verification and calibration of testing machines MS ISO , Metallic materials -- Rockwell hardness test -- Part 1: Test method MS ISO , Metallic materials -- Tensile testing -- Part 1: Method of test at room temperature JIS G 0320, Standard test method for heat analysis of steel products JIS G 0321:2010, Product analysis and its lerance for wrought steel JIS G 0415:2015, Steel and steel products - Inspection documents JIS G 0551, Steels - Micrographic determination of the apparent grain size JIS G 0553, Steel - Macroscopic examination by etching JIS G 0555, Microscopic testing method for the non-metallic inclusions in steel JIS G 0558, Steels - Determination of depth of decarburization JIS G 0561, Method of hardenability test for steel (End quenching method) JIS G 0901, Classification of structural rolled steel plate and wide flat for building by ultrasonic test JIS G 3191, Dimensions, mass and permissible variations of hot rolled steel bars and bar in coil JIS G 3194, Dimensions, mass and permissible variations of hot-rolled flat steel STANDARDS MALAYSIA All rights reserved 1

6 JIS Z , Non-destructive testing - Magnetic particle testing - Part 1: General principles JIS Z 2344, General rule of ultrasonic testing of ultrasonic testing of metals by pulse echo technique 3 Designation of grade The steels shall be classified in 8 grades, and their designations shall be as given in Table 1. Designation of grade SUP6 SUP7 SUP9 SUP9A SUP10 SUP11A Table 1. Designation of grade Silicon manganese steels Manganese chromium steels Chromium vanadium steels Manganese chromium boron steels Remarks Mainly used for laminated spring, coiled spring and rsion bar spring Mainly used for coiled spring and rsion bar spring Mainly used for large laminated spring, coiled spring and rsion bar spring. SUP12 Silicon chromium steels Mainly used for coiled spring. SUP13 Chromium molybdenum steels 4 Method of manufacture The method of manufacture shall be as follows: Mainly used for large laminated spring and coil spring. a) The steels shall be manufactured from killed steel. b) Steels shall be rolled or forged as the forming ratio of 4S or over unless otherwise specified. In the case where the forming ratio of steels for rolling or forging is less than 4S, it shall be upon the agreement between the purchaser and the manufacturer. NOTE. S means the ratio of bend radius (radius curvature) the thickness of flat sample. 2 STANDARDS MALAYSIA All rights reserved

7 c) The hot-rolled steels, unless otherwise specified, shall be as rolled. d) The cold-worked steels shall be supplied in such a way that the hot-rolled steels shall be hot-rolled then cold-worked, and shall be manufactured by cold-drawing, cutting, grinding or any combination thereof according the specification. 5 Chemical composition The steels shall be subjected the test of 8.1 and their cast analysis values shall be given in Table 2. When the product analysis values of steels are requested by the purchaser, the test of 8.1 shall be performed, and the lerances corresponding Table 2 shall be given in Table 4 of JIS G Elements not specified in this table shall not be intentionally added for purposes other than finishing the molten steel. Table 2. Chemical composition Unit in percentage Designation of grade C Si Mn P a) S a) Cu Cr Mo V B SUP SUP SUP SUP9A SUP SUP11A min SUP SUP a) The values of P and S may be specified be not more than % upon the agreement between the purchaser and the manufacturer. STANDARDS MALAYSIA All rights reserved 3

8 6 Appearance, shape, dimensions and lerances 6.1 Appearance The steels shall be well-finished and free from defects detrimental practical use. However, for the steels furnished in coil form, the detection of defects for the whole length is generally difficult and since there is no chance remove them, the steels sometimes may include defective parts. Therefore, the treatment for the defective part, if necessary, shall be upon the agreement between the purchaser and the manufacturer. 6.2 Standard for removing defects and allowable limit of remaining defects for steels The standard for removing defects and allowable limit of remaining defects for steels shall be upon the agreement between the purchaser and the manufacturer. 6.3 Shape, dimensions and lerances Round bar, wire rod and wire Hot-rolled steels The standard dimension for the hot-rolled steels (round bar and wire rod) be hot-formed in springs shall be as given in Table 3, and the dimensional lerances shall be as given in Table 4. The dimensions and lerances for the steels which are subjected cold-drawing, cutting, etc. shall be as specified in clause 6 of MS 2247:2009 (P). For the wire rod, of 32 mm or less in diameter is applicable, in general. Table 3. Standard dimension (diameter) for hot-rolled steels (hot-forming in springs as it is) STANDARDS MALAYSIA All rights reserved

9 Table 4. Tolerances on hot-rolled steels (hot-forming in springs as it is) Dimensions in millimetres Diameter, Ø Tolerances Deviation a) Ø < 10 ± Ø < 16 ± Ø < 21 ± Ø < 34 ± Ø < 46 ± Ø < 75 ± Ø 80 ± NOTE. The dimensions other than those in this table be agreed between the purchaser and the manufacturer. a) The deviation means the difference between the minimum diameter and the imum diameter at the single section of round bar The lerances on length for the round bar shall be mm the specified 0 dimension by the purchaser unless otherwise agreed between the purchaser and the manufacturer The camber for the round bar shall not be more than 3 mm in any 1 m length, and not more than 3 mm X ( ) or less, for the tal length Cold-worked steels. The standard dimension for the cold-worked steels (round bar and wire) shall be as given in Table 5, and the lerances shall be as given in Table 6. For the wire rod of 14 mm or less in diameter is applicable, in general. Table 5. Standard dimension (diameter) for cold-worked steels Dimensions in millimetres The lerances on length for the round bar shall be +25 mm the specified 0 dimension by the purchaser unless otherwise agreed between the purchaser and the manufacturer The dimensions other than those in Table 5 shall be upon the agreement between the purchaser and the manufacturer. STANDARDS MALAYSIA All rights reserved 5

10 Table 6. Tolerances for cold-worked steels Dimensions in millimetres Diameter, Ø Tolerances Deviation a) Ø < 12.5 ± Ø < 26 ± Ø < 48 ± Ø < 80 ± a) The deviation means the difference between the minimum diameter and the imum diameter at the single section of round bar Flat steel The shape, dimensions and lerances of the flat steel shall be as follows Profile of section Key b Width of flat steel R Profile of round edge (curvature radius) t Thickness of flat steel Figure 1. Profile of section of flat steel The profile of section of flat steel shall be as given in Figure 1. The profile of section other than that in Figure 1 shall be upon the agreement between the purchaser and the manufacturer Standard dimension and lerances The standard dimension and the lerances of flat steel shall be as given in Table The thickness shall be measured at both ends of the width, and the difference between the thicknesses at both ends shall not be more than 25 % of the range of lerances on thickness specified in this table (however, the minimum value is 0.10 mm). Both surfaces shall not be convex The profile of both edges of width shall be the round edge. However, this R may be substituted with the numerical value upon the agreement between the purchaser and the manufacturer. 6 STANDARDS MALAYSIA All rights reserved

11 The lerances on length of the flat steel shall be +40 mm the dimension specified 0 by the purchaser unless otherwise agreed between the purchaser and the manufacturer Camber The camber for steel flats shall be not more than 15 mm in any 5 m length and also shall not exceed 3 mm in any 1 m at arbitrary portion. NOTE. The definition of camber is such that the imum deviation c of edge from the line connecting both edges of product or the line connecting arbitral two points as given in Figure 2. Key b Width of flat steel l Length of flat steel or distance between any two points of edge c camber 7 Decarburisation Figure 2. Camber of steel flat The steels shall be free from decarburisation that is detrimental practical use. The allowable limit for the decarburisation depth may be upon the agreement between the purchaser and the manufacturer, in which the measuring method of the decarburisation depth shall be as specified in 8.2. STANDARDS MALAYSIA All rights reserved 7

12 8 STANDARDS MALAYSIA All rights reserved Width, b Tolerances on width Table 7. Standard dimension and lerances for flat steel Thickness, t Dimensions in millimetres ± 0.50 ± 0.15 ± 0.15 ± 0.25 Tolerances on thickness 50 ± 0.60 ± 0.15 ± 0.15 ± 0.18 ± 0.20 ± 0.20 ± 0.25 ± 0.25 ± 0.25 ± ± 0.60 ± 0.15 ± 0.15 ± 0.18 ± 0.20 ± 0.20 ± 0.25 ± 0.25 ± 0.30 ± 0.30 ± ± ± 0.18 ± 0.18 ± 0.20 ± 0.25 ± 0.25 ± 0.25 ± 0.30 ± 0.30 ± 0.30 ± 0.35 ± 0.35 ± 0.40 ± 0.45 ± ± ± 0.20 ± 0.20 ± 0.25 ± 0.25 ± 0.30 ± 0.30 ± 0.30 ± 0.30 ± 0.35 ± 0.35 ± ± ± 0.25 ± 0.25 ± 0.30 ± 0.30 ± 0.30 ± 0.30 ± 0.35 ± 0.35 ± 0.40 ± 0.45 ± ± ± 0.30 ± 0.30 ± 0.30 ± 0.30 ± 0.35 ± 0.35 ± 0.40 ± 0.45 ± ± ± 0.40 ± 0.40 ± 0.50 ± 0.50 NOTE. The dimensions other than those in this table be agreed between the purchaser and the manufacturer.

13 8 Tests 8.1 Chemical analysis test The chemical analysis test shall be as follows: a) The general requirements for chemical analysis test and the sampling method for cast analysis shall be as specified in MS b) The sampling method for product analysis shall be as specified in Clause 4 of JIS G 0321:2010. c) The cast analysis method shall be as specified in JIS G 0320 and the product analysis method shall be as specified in JIS G 0321: Method of measuring decarburised depth The method of measuring the decarburised depth shall be as specified in JIS G Unless otherwise specified, the measurement by microscope, among other methods, specified in JIS G 0558 shall apply. 8.3 Other tests Upon agreement between the purchaser and the manufacturer, the purchaser may designate the following tests, provided that the sampling method of specimen, test method and others shall preliminarily be agreed with the manufacturer. Tests conducted are on grain size, macrostructure, non-metallic inclusions, hardenability, magnetic particle, ultrasonic, mechanical properties and microstructure inspections. The testing methods shall be as follows, respectively. Grain size JIS G 0551 Macrostructure JIS G 0553 Non-metallic inclusions JIS G 0555 Hardenability JIS G 0561 Magnetic particle JIS Z Ultrasonic JIS G 0901, JIS Z 2344 Mechanical properties MS ISO , MS ISO MS ISO The testing method of microstructure shall be upon the agreement between the purchaser and the manufacturer. 9 Inspection The inspection shall be as follows: a) General items for inspection shall be as specified in MS 1846; STANDARDS MALAYSIA All rights reserved 9

14 b) The chemical composition shall comply with Clause 5; c) The appearance, shapes, dimensions and lerances shall comply with Clause 6; d) Decarburisation shall comply with Clause 7; and e) Other inspections when either of the tests specified in 8.3 is performed, the test result shall comply with the criteria of acceptance upon agreement between the purchaser and the manufacturer. 10 Marking The marking on each steel shall be done with the following items by, a suitable method. The round bar, wire rod, wire, and flat steel that having a diameter less than 30 mm may be bound up and the marking may be made on each bundle by a suitable method. However, the hot-rolled steel round bar with diameter of 30 mm or more shall be legibly marked on each product individually. A part of following particulars may be omitted when agreed upon between the purchaser and the manufacturer: a) Designation of grade. b) Heat number or manufacturing number, c) Manufacturer s name or its identifying brand. d) Method of marking dimensions shall be as specified in JIS G 3191 or JIS G However, the expression method of wire rod shall be as the method of dimension expression method of bar-in-coil as specified in JIS G Report The report shall comply with the requirement as specified in MS However, unless otherwise specified at the time of ordering, the type of inspection document shall comply with standard designation 2.3 or 3.1B in Table 1 of JIS G 0415:2015. Further, the report of Clause 9 e) shall be upon the agreement between purchaser and the manufacturer. 10 STANDARDS MALAYSIA All rights reserved

15 Acknowledgements Members of Technical Committee on Alloy Steels Prof Dr Mohd Abd Maleque (Chairman) Ms Nageswary S Iyampillai (Secretary) Mr Yee Sen Tat Mr Ng Beng Fooi Mr. Jack Chum Mr Azman Idris Mr Mark Lim Mr Mohd Azlan Mat Isa Mr Dalha Rahmat Ms Chua Seok Cheng Assoc Prof Dr Zainuddin Sajuri Prof Dr Ahmad Badri Ismail Co-opted members Ms Lee Hooi Lan Universiti Islam Antarabangsa Malaysia SIRIM Berhad Amsteel Mills Sdn Bhd Ann Joo Steel Berhad BlueScope Steel (Malaysia) Sdn. Bhd IKRAM QA Services Sdn Bhd Malaysian Iron and Steel Industry Federation SIRIM QAS International Sdn Bhd (Testing Services Department - Civil and Construction Section Testing) SIRIM QAS International Sdn Bhd (Testing Services Department - Technical and Calibration Section) Southern Steel Berhad Universiti Kebangsaan Malaysia Universiti Sains Malaysia Malaysia Steel Institute STANDARDS MALAYSIA All rights reserved

16 Copyright 2016 All rights reserved. No part of this publication may be reproduced or utilised in any form or by any means, electronic or mechanical, including phocopying and microfilm, without permission in writing from the Department of Standards Malaysia.