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Similar standardsQ/BQB 408-2023: Low carbon cold-rolled steel sheet and strip for cold forming---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/QBQB408-2023BQB ENTERPRISE STANDARD OF BAOSTEEL CO., LTD. Replacing Q/BQB 408-2021 Low carbon cold-rolled steel sheet and strip for cold forming Issued on: APRIL 09, 2023 Implemented on: JULY 01, 2023 Issued by. BaoSteel Co., Ltd. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Classification and code... 6 5 Information required for ordering... 7 6 Dimensions, appearance, weight, allowable deviations... 8 7 Technical requirements... 8 8 Inspection and testing... 13 9 Packaging, marking, inspection documents... 15 10 Numerical rounding rules... 15 11 Comparison of similar designations... 15 Appendix A (Normative) Hard material... 16 Appendix B (Informative) Hardness reference value of SPCC-X series specific designation... 19 Appendix C (Informative) Comparison of similar designations between this document and relevant domestic and foreign standards... 20ForewordThis document was drafted in accordance with the provisions of GB/T 1.1-2020 "Directives for standardization - Part 1.Rules for the structure and drafting of standardizing documents". This document was prepared with reference to JIS G 3141.2021, EN 10130.2006, JFS A 2001.2014. This document replaces Q/BQB 408-2021 "Low carbon cold-rolled steel sheet and strip for cold forming". Compared with Q/BQB 408-2021, the main technical changes in this document are as follows. - MODIFY normative references; - ADD the definition of type code for SPCC designation tempering degree (Table 4); - MODIFY the composition requirements of Mn and S for SPCC series designation, as well as the composition requirements for Mn, P, S for SPCD and SPCE series designation, in Table 5; - MODIFY the composition requirements of Mn, P, S of DC01 designation, as well as the composition requirements of P and S of DC03 and DC04 designation, in Table 6; - MODIFY the composition requirements of Mn, P, S of BLC designation, as well as the composition requirements of P and S of BLD and BUSD designations, in Table 7; - DELETE the composition requirements for Al in Table 5, Table 6, Table 7; - MODIFY the provisions for tensile specimens in Tables 8, 9, 11, uniformly adopting the P17 specimens specified in GB/T 228.1; - In Table 10, ADD the requirement that when the product thickness is > 2.3 mm ~ 2.5 mm, the r90 value is allowed to be reduced by 0.4; - In Table 14, SUPPLEMENT the description of the scope of application of surface structure; - In the tensile test method 8.3, ADD the second-level rate requirement (original 7.3); - CHANGE the statement of 8.4 "Description of r-value and n-value detection methods" (original 7.4); - REVISE the Appendix C -- Comparison similar designations among relevant domestic and foreign standards; - MAKE editorial changes to documents. Appendix A of this document is a normative appendix. Appendices B and C are informative appendixes. This document was proposed by the Manufacturing Management Department of Baoshan Iron and Steel Co., Ltd. This document shall be under the jurisdiction of the Manufacturing Management Department of Baoshan Iron and Steel Co., Ltd. This document is drafted by the Manufacturing Management Department of Baoshan Iron and Steel Co., Ltd. The main drafter of this document. Yuan Min. This standard replaces the standard previously issued as follows. Q/BQB 408-1988, Q/BQB 408-1994, Q/BQB 408-1999, Q/BQB 408-2003, Q/BQB 408-2009, Q/BQB 408-2014, Q/BQB 408-2018, Q/BQB 408-2019, Q/BQB 408-2021. Low carbon cold-rolled steel sheet and strip for cold forming1 ScopeThis document stipulates the classification and code, size, shape, weight, technical requirements, inspection and testing, packaging, marking and inspection documents of low carbon cold-rolled steel sheet and strip for cold forming. This document applies to low carbon cold-rolled steel sheet and strip for cold forming (hereinafter referred to as steel plates and strips), which have a thickness of 0.17 mm ~ 3.5 mm, as produced by Baoshan Iron & Steel Co., Ltd.2 Normative referencesThe contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, for dated reference documents, only the version corresponding to the date applies to this document; for undated reference documents, the latest version (including all amendments) applies to this document. GB/T 222 Permissible tolerances for chemical composition of steel products GB/T 223 Chemical analysis methods for steel and alloys GB/T 228.1-2021 Metallic materials - Tensile testing - Part 1.Method of test at room temperature GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1.Test method GB/T 232 Metallic materials - Bend test GB/T 2523 Measuring method of surface roughness, peak count and waviness for cold-rolled metal sheet and strip GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method) GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1.Test method GB/T 5027 Metallic materials - Sheet and strip - Determination of plastic strain ratio GB/T 5028 Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition GB/T 20123 Steel and iron - Determination of total carbon and sulfur content Infrared absorption method after combustion in an induction furnace (routine method) GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method GB/T 20126 Unalloyed steel - Determination of low carbon content - Part 2.Infrared absorption method after combustion in an induction furnace (with preheating) Q/BQB 400 Package, mark and inspection document for cold-rolled product Q/BQB 401 Dimension, shape, weight and tolerances for cold-rolled steel sheet and strip3 Terms and definitionsThere are no terms or definitions to be defined in this document.4 Classification and code4.1 Steel sheets and strips shall comply with the requirements in Table 1, when divided according to their uses. 4.2 Steel sheets and strips shall comply with the requirements in Table 2, when divided according to surface quality. 4.3 Steel sheets and strips shall comply with the requirements in Table 3, when divided according to surface structure. 4.4 Codes for distinguishing types of tempering degrees of steel sheets and strips with SPCC designation.5 Information required for ordering5.1 Users shall provide the following information when ordering. a) Product name (steel sheet or steel strip); b) Enterprise standard number of this document; c) Designation; d) Product specifications, dimensions, unevenness precision; e) Edge state; f) Surface structure; g) Surface quality grade; h) Greasing requirements; i) Packaging method; j) Purpose; k) Others. 5.2 If the size and unevenness precision, surface structure, surface quality grade, edge state, packaging method are not specified in the order contract, the product in this document shall be supplied in trimmed steel strips or trimmed steel plates, based on the ordinary size and unevenness precision, surface structure of pitted surface, surface quality FB, meanwhile packaged according to the packaging method provided by the supplier.6 Dimensions, appearance, weight, allowable deviationsThe dimension, shape, weight, allowable deviations of steel sheets and strips shall comply with the provisions of Q/BQB 401.The thickness and unevenness allowable deviations of SPCC designation shall comply with the corresponding provisions, when the minimum yield strength specified in Q/BQB 401 is < 260 MPa.7 Technical requirements7.1 Chemical composition 7.1.1 The chemical composition (smelting analysis) of steel shall comply with the provisions of Table 5, Table 6, Table 7. 7.1.2 The allowable deviation of the chemical composition of finished steel sheets and strips shall comply with the provisions of GB/T 222. 7.2 Smelting methods The steel used for steel sheets and strips is smelted in an oxygen converter. 7.3 Delivery state 7.3.1 Steel sheets and strips are usually delivered after cold rolling, annealing, leveling. 7.3.2 Steel sheets and strips are usually supplied with grease; the grease film shall be removable with alkali aqueous solution. Under normal packaging, transportation, loading and unloading, storage conditions, the supplier shall ensure that the surface of the steel sheets and strips will not rust within 6 months from the date of completion of manufacturing. According to the requirements of the purchaser, the product can also be supplied without greasing, after agreement between the supplier and the buyer and being specified in the contract. The supplier will not bear corresponding product quality responsibility for defects such as rust, scratches, friction marks, which are caused by ungreased products during handling, storage, and use. Note. The issuance date in the product inspection document is usually specified as the manufacturing completion date of the product. 7.4 Mechanical properties 7.4.1 The supplier guarantees that within 6 months from the date of completion of manufacturing, the mechanical properties of steel sheets and strips shall comply with the provisions of Table 8, Table 9, Table 10, Table 11.Steel sheets and strips with designation DC01 shall comply with the requirements of Note d in Table 10. 7.4.2 When steel sheets and strips are supplied as specified parts, the supplier and the buyer can agree on a mechanical property range, that meets the processing requirements of the parts, as the acceptance criterion. At this time, the mechanical properties specified in Table 8, Table 9, Table 10, Table 11 will no longer be the basis for delivery. 7.4.3 Due to the influence of aging, the mechanical properties of steel sheets and strips will deteriorate with the extension of storage time, such as the increase in yield strength and tensile strength, the decrease in elongation at break, the deterioration of formability, the occurrence of tensile strain marks, etc., it is recommended that users use it as soon as possible. 7.4.4 The hardness and performance requirements for hard materials with the designation SPCC shall be as specified in Appendix A. 7.5 Tensile strain marks Under room temperature storage conditions, for steel sheets and strips with surface quality grades of FC and FD, tensile strain marks shall comply with the requirements in Table 12. 7.6 Surface quality 7.6.1 The surface of steel sheets and strips shall not have holes, surface cracks, laminations, or other defects that are harmful to use. 7.6.2 The characteristics of each surface quality grade of steel sheets and strips shall comply with the provisions of Table 13. 7.6.3 For steel strips, since there is no opportunity to cut off the defective part of the strip, the steel strip is allowed to be delivered with defects; however, the defective part shall not exceed 3% of the total length of each roll. If the user has special requirements, they can be determined through negotiation when ordering. 7.7 Surface structure 7.7.1 The average surface roughness of steel sheets and strips shall be controlled in accordance with the requirements of Table 14.If the purchaser has special requirements for roughness, these shall be negotiated when ordering. 7.7.2 Surface structure suitable for environmentally friendly coating (BAOTEXTM) BAOTEXTM products can meet the technical requirements of advanced environmentally friendly coating processes. If users have needs, they can be negotiated when ordering.8 Inspection and testing8.1 The appearance of steel sheets and strips shall be visually inspected. 8.2 The size and shape of steel sheets and strips shall be measured, using appropriate measuring tools. 8.3 The tensile test shall be in accordance with Method B of GB/T 228.1-2021.In order to improve the reproducibility of the measurement results, it is recommended to use the beam displacement rate control method. The beam displacement rate for determining the yield strength is 0.00083 × Lc (mm/s) (where Lc is the parallel length of the tensile specimen, in mm, the same below) or 0.05 × Lc (mm/min). After the yield strength is measured, the beam displacement rate is 0.0067 × Lc (mm/s) or 0.4 × Lc (mm/min). 8.4 The r value is calculated at 15% plastic strain. When the maximum force plastic elongation Ag is less than 15%, the value of the plastic strain at the end of Ag is calculated. The n value is calculated in the range of 10% ~ 20% plastic strain. When Ag is less than 20%, the calculated strain range is 10% to Ag. 8.5 Steel sheets and strips shall be inspected and accepted in batches. Each inspection batch shall be composed of steel sheets and strips of the same designation, specification, processing state, at not exceeding 30 tons. For steel strips weighing more than 30 tons, each coil forms an inspection lot. 8.6 The inspection items, number of samples, sampling methods, test methods for each batch of steel sheets and strips shall comply with the provisions of Table 15. 8.7 The supplier may use different inspection and test methods for acceptance testing. In the event of a dispute, it shall use the inspection and test methods and relevant technical requirements specified in this document for testing. 8.8 Reinspection For tensile test, strain hardening index (n value), plastic strain ratio (r value), Rockwell hardness or Vickers hardness, bending test, if any test result does not meet the requirements of this document, it shall take double quantity of specimens randomly from the same batch, to carry out reinspection for this unqualified item. If the re- inspection results (including all indicators required for the test of item) are qualified, the whole batch will be qualified. If even one index in the reinspection results (including all indicators required for the test of the item) fails, the reinspection will fail. If the re- inspection fails, the individual pieces that have been tested and have inconsistent test results cannot be accepted; however, the individual pieces in the batch of materials that have not been tested can be resubmitted for testing and acceptance one by one.9 Packaging, marking, inspection documentsThe packaging, marking, inspection documents of steel sheets and strips shall comply with the requirements of Q/BQB 400.If the purchaser has special requirements for packaging weight, these shall be noted in the contract.10 Numerical rounding rulesThe numerical judgment adopts the rounding value comparison method; the numerical rounding shall comply with the provisions of GB/T 8170.11 Comparison of similar designationsSee Appendix C for a comparison of similar designations between this document and relevant domestic and foreign standards.Appendix A(Normative) Hard material A.1 For steel sheets and strips with the designation SPCC, hard steel sheet and steel strip materials (hereinafter referred to as hard materials) can be provided, according to different tempering requirements. A.2 The distinguishing of tempering degree of hard materials shall comply with the provisions of Table A.1. A.3 The chemical composition of hard materials is determined by the supplier. A.4 Hardness of hard materials A.4.1 If hard materials are ordered according to the tempering degree of 1/8 hard, 1/4 hard, hard, their Rockwell hardness (HRBS or HRBW) or Vickers hardness (HV)) shall comply with the provisions of Table A.2.Unless otherwise specified, the supplier only reports the measured value of Rockwell hardness. A.4.2 For thin hard materials, such as Rockwell hardness (HRB) cannot be tested, the surface hardness of the hard material can be tested by Rockwell hardness (HR30T or HR15T) or Vickers hardness (HV); then converted to HRB according to the provisions of Table A.3, Table A.4, Table A.5 of Appendix A. A.4.3 Examples of the minimum measured thickness of hard materials corresponding to Rockwell hardness (HRB) can be found in Table A.6. A.4.4 When measuring HR30T or HR15T, a diamond anvil shall be used; indentations are allowed on the back of the hard material specimen. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of Q/BQB 408-2023 be delivered?Answer: The full copy PDF of English version of Q/BQB 408-2023 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of Q/BQB 408-2023_English with my colleagues?Answer: Yes. The purchased PDF of Q/BQB 408-2023_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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