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Q/BQB 408-2014 (Q/BQB 408-2023 Newer Version) PDF English


Q/BQB 408-2014 (Q/BQB408-2014, QBQB 408-2014, QBQB408-2014)
Standard IDContents [version]USDSTEP2[PDF] delivered inName of Chinese StandardStatus
Q/BQB 408-2023English480 Add to Cart 0-9 seconds. Auto-delivery. Low carbon cold-rolled steel sheet and strip for cold forming
Q/BQB 408-2021English155 Add to Cart 0-9 seconds. Auto-delivery. Low carbon cold-rolled steel sheet and strip for cold forming
Q/BQB 408-2018English130 Add to Cart 0-9 seconds. Auto-delivery. Cold formed low carbon steel sheet and strip for cold forming Obsolete
Q/BQB 408-2014English85 Add to Cart 0-9 seconds. Auto-delivery. [Replaced by Q/BQB 408-2018] Cold formed low carbon steel sheet and strip for cold forming Obsolete
Q/BQB 408-2009English249 Add to Cart 3 days Cold rolled strip and strip for stamping Obsolete
Newer version: Q/BQB 408-2023     Standards related to (historical): Q/BQB 408-2023
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Q/BQB 408-2014: PDF in English (QBQB 408-2014)

Q/BQB 408-2014 TECHNICAL SUPPLY CONDITION OF BAOSTEEL GROUP CORPORATION Replacing Q/BQB 402-2009, Q/BQB 403-2009, Q/BQB 408-2009 Cold formed low carbon steel sheet and strip for cold forming ISSUED ON: OCTOBER 18, 2014 IMPLEMENTED ON: MARCH 31, 2015 Issued by: Baosteel Group Corporation Table of contents 1 Scope ... 3  2 Normative references ... 3  3 Classification and code ... 4  4 Information required for ordering ... 5  5 Size, shape, mass and allowable deviation ... 6  6 Technical requirements ... 6  7 Inspection and testing ... 11  8 Packaging, marking and inspection documents ... 12  9 Rounding off rules ... 12  10 Designation approximate comparison ... 12  APPENDIX A Normative appendix Hard materials ... 13  APPENDIX B (Informative) Approximate comparison between the designations of this technical specification and the designations of domestic and international technical specifications ... 16  Additional information: ... 17  Cold formed low carbon steel sheet and strip for cold forming 1 Scope This technical specification specifies the classification and code, size, shape, mass, technical requirements, inspection and testing, packaging, signs and inspection documents, and so on, of the cold-rolled low carbon steel sheet and strip for cold forming purposes. The technical specification applies to the thickness 0.17 mm ~ 3.5 mm cold- rolled low carbon steel sheet and strip as produced by Baosteel Group Corporation (Abbreviated as steel sheet and strip). 2 Normative references The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. GB/T 222-2006 Permissible tolerances for chemical composition of steel products GB/T 223 (all parts) Methods for chemical analysis of iron steel and alloy GB/T 228.1-2010 Metallic materials – Tensile testing – Part 1: Method of test at ambient temperature GB/T 230.1-2009 Metallic materials – Rockwell hardness test – Part 1: Test method (scales A, B, C, D, E, F, G, K, N, T) GB/T 232-2010 Metallic materials – Bend test GB/T 2523-2008 Measuring method of surface and peak count for cold-rolled metal sheet (strip) GB/T 2975-1998 Steel and steel products – Location and preparation of test pieces for mechanical testing GB/T 4336-2002 Carbon and low-alloy steel – Determination of multi- element contents – Spark discharge atomic emission spectrometric method (routine method) GB/T 4340.1-2009 Metallic materials - Vickers hardness test - Part 1: Test method GB/T 5027-2007 Metallic materials – Sheet and strip - Determination of plastic strain ratio GB/T 5028-2008 Metallic materials – Sheet and strip - Determination of tensile strain hardening exponent GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 20066-2006 Steel and iron – Sampling and preparation of samples for the determination of chemical composition GB/T 20123-2006 Steel and iron – Determination of total carbon and sulfur content infrared absorption method after combustion in an induction furnace (routine method) GB/T 20125-2006 Low alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method GB/T 20126-2006 Unalloyed steel – Determination of low carbon content – Part 2: Infrared absorption method after combustion in an induction furnace (with preheating) Q/BQB 400 Cold rolled products - packaging, marking and inspection documents Q/BQB 401 Cold rolled steel sheets and strips - Dimensions, shape, weight and tolerances JIS Z2241:2011 Metallic materials - Tensile testing - Method of test at room temperature 3 Classification and code 3.1 The classification of steel sheet and strip based on application shall comply with the provisions of Table 1. 7 Inspection and testing 7.1 The appearance of steel sheet and strip shall be checked with the naked eyes. 7.2 The dimensions and shape of steel sheet and strip shall be measured by suitable measuring tools. 7.3 Tensile test shall be in accordance with the method B in GB/T 228.1. In order to improve the reproducibility of the measurement results, it is recommended to use the beam displacement control method, the yield strength measurement rate is 5%Lc/min, AND the tensile strength measurement rate is 40%Lc/min (Lc refers to the parallel length of the sample). 7.4 The r value is calculated at 15% strain. When the uniform elongation is less than 15%, CONDUCT calculation based on the strain value at the end of uniform elongation. The n value is calculated in the strain range of 10% ~ 20%. When the uniform elongation is less than 20%, CONDUCT calculation based on the strain range from 10% to the end of uniform elongation. 7.5 The steel sheet and steel strip shall be inspected and accepted in batches. Each inspection lot shall consist of steel sheet and steel strip of the same designation, same specification, and same processing status (not over 30 ton). As for the steel strip over 30 ton in mass, each strip will from an inspection lot. 7.6 The test items, number of samples, sampling method and test method for each batch of steel sheet and strip shall comply with the requirements in Table 12. 7.7 The supplier may use different inspection and test methods to conduct acceptance test. In the event of a dispute, it shall use the inspection and test methods as well as the relevant technical requirements specified in this technical specification to conduct test. Vickers hardness 1 / batch GB/T 4340.1 Bending test 1 / batch GB/T 232 Surface roughness - GB/T 2523 7.8 Re-inspection As for the tensile test, strain hardening index (n value), plastic strain ratio (r value), Rockwell hardness or Vickers hardness, and bending test, if the test result of any item does not comply with the technical requirements of this specification, then from the same batch, RE-TAKE the double number of samples to conduct re-inspection of this failure item. If the re-inspection results (including all the indicators required by this test item) are qualified, this batch is qualified. Even though there is only one indicator of the re-inspection results (including all the indicators required for this test item) unqualified, this batch is deemed as unqualified. Under such conditions, the individual piece which had been subjected to the test BUT failed to pass the test will be rejected; however, the other individual piece from this batch of materials which had not been subjected to the test can be submitted again one by one for the test and acceptance. 8 Packaging, marking and inspection documents The packaging, marking and inspection documents for steel sheet and strip shall comply with the requirements of Q/BQB 400. If the buyer has special requirements for the packaging mass, it shall be noted in the contact. 9 Rounding off rules The numerical rounding off rules shall comply with the provisions of GB/T 8170. 10 Designation approximate comparison The approximate comparison between the designations of this technical specification and the designations of domestic and foreign technical specifications is shown Appendix A. APPENDIX A Normative appendix Hard materials A.1 As for the steel sheet and stripe with the designation of SPCC, it is allowed to, based on different tempering type requirements, supply the hard steel sheet and strip materials (abbreviated as hard materials). A.2 The tempering degree classification of the hard material shall comply with the provisions of Table A.1; A.3 The chemical composition of hard materials shall be determined by the supplier. A.4 Hardness of hard materials A.4.1 As for the hard materials, if being ordered based on the tempering degree of 1/8 hard, 1/4 hard, and hard, the Rockwell hardness (HRBS or HRBW) or Vickers hardness (HV) shall comply with the provisions of Table A.2. Unless otherwise specified, the supplier shall only report the Rockwell hardness test values. A.4.2 As for the thin hard materials, if the Rockwell hardness (HRB) cannot be measured, it is allowed to measure the Rockwell hardness (HR30T or HR15T) or Vickers hardness (HV) of the surface hardness of the hard materials, AND in accordance with the provisions of the Table A.3, Table A.4 and Table A.5 of the Appendix A, CONVERT the results to HRB. A.4.3 As for the minimum measurement thickness example of hard materials as corresponding to the Rockwell hardness (HRB), SEE Table A.6. A.4.4 When HR30T or HR15T is to be measured, if using a diamond anvil, it is allowed for the backside of the hard material sample to appear indentation mark. Additional information: This technical specification was compiled referring to JIS G 3141:2011, EN 10130:2006, and JFS A 2001:2008. This technical specification replaces Q/BQB 402-2009, Q/BQB 403-2009 and Q/BQB 408-2009. As compared with Q/BQB 402-2009, Q/BQB 403-2009 and Q/BQB 408-2009, the main changes are as follows: - DELETE the designation SPCEN; - ADJUST the thickness level of r value in Table 7; - ADJUST the relevant performance requirements for the steel for which the designation is SPCC AND the tempering degree is 1/4 hard, 1/8 hard and full hard respectively; ADD the conversion relation table between the hardness value HR30T, HR15T, HV and HRB (Appendix A); - ADD the quality obligation requirements for the product which is not surfaced with grease; - ADD the requirements for mechanical performance guarantee period; - ADD the requirements for mechanical performance when the product is supplied as specified parts; - DEFINE the method used to conduct tensile test; - ADD the the requirements for in-house inspection methods. Appendix A of this specification is a normative appendix AND Appendix B is an informative appendix. This technical specification was proposed by the Manufacturing Management Department of Baosteel Group Corporation. This technical specification was drafted by the Manufacturing Management Department of Baosteel Group Corporation. The drafter of this technical specification: Sun Zhongming. This technical specification was firstly issued in 1988, firstly amended in 1994, secondly amended in 1999, thirdly amended in 2003, AND fourthly amended in 2009. This is the fifth amendment. ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.