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Codeofchina.com is in charge of this English translation. In case of any doubt about the contents of English translation, the Chinese original shall be considered authoritative. This standard is developed in accordance with the rules given in GB/T 1.1-2009 Directives for Standardization —Part 1: Structure and Drafting of Standards. This standard is formulated on the base of JIS G3113-2006, JIS G3134-2006, EN 10149-2:2013, YB/T 4151-2006 and GB/T 3273-2005, and in combination with the actual situation of Baosteel. This standard replaces Q/BQB 310-2009 and BZJ 310-2012. The following technical deviations have been made with respect to Q/BQB 310-2009 (the previous edition): — Editions of normative references are updated; — Addition: designations QStE550TM, QStE600TM, QStE650TM, QStE700TM and corresponding technical requirements; — Addition: designations B450CL, B500CL, B550CL, B600CL, B650CL and corresponding technical requirements; — Addition: designations B600L, B650L, B700L, B750L and corresponding technical requirements; — The nominal thickness ranges of partial designations in Table 1 are extended; — Adjustment: the upper limits of chemical composition Mn content of partial designations in Table 2; — Correction: the misprint of SPFH590; — Addition: the corresponding relationship between newly-added designations in the comparison table of similar standards in Annex A; — Other editorial changes. This standard was proposed by manufacture and management department of Baoshan Iron & Steel Co., Ltd. This standard was prepared by manufacture and management department of Baoshan Iron & Steel Co., Ltd. This standard was drafted by manufacture and management department of Baoshan Iron & Steel Co., Ltd. Chief drafting staff of this standard: Han Yu. The previous editions of this standard are as follows: Q/BQB 310-1989, Q/BQB 310-1994, Q/BQB 310-1999, Q/BQB 310-2003, Q/BQB 310-2009. Continuously Hot-rolled Steel Sheet and Strip for Automobile Structural Use 1 Scope This standard specifies the size, appearance, technical requirements, test and inspection, package, mark and inspection document of continuously hot-rolled steel sheet and strip for automobile structural use. This standard is applicable to continuously hot-rolled steel strip of cold rolled quality carbon structural/low-alloy structural steel, as well as transversally cut steel sheet and longitudinally cut steel strip (hereinafter referred to as steel sheet and strip) produced by Baoshan Iron & Steel Co., Ltd. The products are used for manufacturing of automobile frames, beams, roller wheels, automobile transmission shaft pipes, automobile axle housing and other structure. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel Products GB/T 223 Methods for Chemical Analysis of Iron, Steel and Alloy GB/T 228.1-2010 Metallic Material — Tensile Test — Part 1: Method of Test at Room Temperature GB/T 232-2010 Metallic Materials — Bend Test GB/T 2975-1998 Steel and Steel Products — Location and Preparation of Test Pieces for Mechanical Testing GB/T 4336-2002 Test Method for Spark Discharge Atomic Emission Spectrometric Analysis of Carbon and Low-alloy Steel (Routine Method) 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) Q/BQB 300 General Rules of Package, Mark and Inspection Document for Continuously Hot-rolled Steel Sheet and Strip Q/BQB 301 Dimension, Shape, Weight and Tolerances for Continuously Hot-rolled Steel Sheet and Strip 3 Classification and Designation 3.1 The designation, nominal thickness and application of steel sheet and strip as shown in Table 1. 3.2 The products may be classified into the following types according to surface treatment mode: Pickled surface Rolled surface 3.3 The products may be classified into the following types according to surface quality grade: Ordinary grade surface FA High grade surface FB 3.4 The products may be classified into the following types according to product category: Hot-rolled steel strip Hot-rolled steel sheet Hot-rolled longitudinally cut steel strip Hot rolled acid pickling steel strip Hot rolled pickled plate Table 1 Designation Nominal thickness a mm Purpose SAPH310 1.5 to 16.0 Used for automobile frameworks, wheels and other structural parts that required forming performance SAPH370 1.5 to 12.5 SAPH400 1.5 to 12.0 SAPH440 1.5 to 8.0 SPFH540 SPFH590 1.8 to 6.0 Used for automobile frameworks, wheels and other structural parts that required fine forming performance and high strength QStE340TM, QStE380TM QStE420TM, QStE460TM QStE500TM, QStE550TM 1.5 to 14.0 Used for automobile frames and other structural parts that required fine cold forming performance and high or higher strength QStE600TM, QStE650TM QStE700TM 1.5 to 12.0 B330CL 1.5 to 14.0 Used for manufacturing of automobile wheel rims and wheel spokes that required fine cold forming performance B380CL B420CL B450CL B500CL B550CL B600CL B650CL B320L 1.5 to 8.0 Used for manufacturing of automotive frames and beams B420L 2.0 to 8.0 B510L 2.0 to 14.0 B510DL 4.0 to 8.0 B550L B600L B650L B700L B750L 2.0 to 12 B440QZR 3.0 to 8.0 Used for manufacturing of automobile transmission shaft pipe B480QZR 4.0 to 8.0 B440QK 3.0 to 8.0 Used for manufacturing of automobile axle housing a As for steel sheet and strip with hot rolled pickled surface, nominal thickness ≤6.0 mm. 4 Ordering Information 4.1 The user shall provide the following information for ordering: a) Standard number of the enterprise; b) Product category; c) Designation, surface treatment mode and surface quality grade; d) Specification and size (thickness) accuracy; e) Edge conditions; f) Purpose; g) Inspection document type. 4.2 Omitted items in procurement contract 4.2.1 Where surface treatment mode is not indicated, the products with rolled surface shall be delivered. 4.2.2 For hot-rolled steel sheet and strip, where the dimensional precision is not indicated, unless otherwise specially specified in this standard, the products may be delivered in the normal thickness precision specified in Q/BQB 301; where the edge conditions are not indicated, steel strip shall be delivered in untrimmed condition, and steel sheet delivered in trimmed condition. 4.2.3 As for hot rolled pickled sheet and strip, unless otherwise specially specified in this standard, the products with high thickness accuracy specified in Q/BQB 301 shall be delivered; where edge condition, surface quality grade and greasing requirements are not indicated, the greased products with cut side and high grade surface shall be delivered; where inner diameter of steel coil is not indicated, the products with 610 mm in inner diameter of steel coil shall be delivered. 5 Dimension, Appearance, Weight and Permissible Deviation 5.1 The permissible thickness deviation of B330CL to B650CL, B440QZR and B480QZR shall be in accordance with the higher precision (PT.B) specified in Q/BQB 301. 5.2 Other dimension, appearance, weight and permissible deviations shall be in accordance with Q/BQB 301. 6 Technical Requirements 6.1 Designation and chemical composition 6.1.1 Designation and chemical composition (melting analysis) of steel shall be in accordance with those specified in Tables 2 through 4. 6.1.2 The content of residual elements in steel shall be in accordance with the following requirements: Cu ≤ 0.20%, Cr ≤ 0.15% and Ni ≤ 0.15%. However, the chemical analysis of these elements can be not carried out when the supplier can guarantee the content of the residual elements Cu, Cr, Ni in steel in accordance with such requirements. 6.1.3 The permissible deviation for chemical composition of finished product of steel sheet and strip shall be in accordance with GB/T 222. 6.2 Smelting process The steel used for steel sheet and strip shall be killed steel smelted by oxygen converter. 6.3 Delivery state Steel sheet and strip shall be delivered in hot rolled or control rolled state. Table 2 Designation Chemical composition a (mass fraction), % C Si Mn P S Alt SAPH310 ≤0.10 ≤0.30 ≤0.60 ≤0.035 ≤0.035 ≥0.010 SAPH370 ≤0.21 ≤0.30 ≤0.75 SAPH400 ≤0.21 ≤0.30 ≤1.40 ≤0.030 ≤0.025 SAPH440 ≤1.60 SPFH540 ≤0.15 ≤0.50 ≤1.80 ≤0.025 ≤0.025 SPFH590 ≤0.18 ≤0.60 ≤2.00 B440QK ≤0.21 ≤0.35 ≤1.80 ≤0.030 ≤0.025 B330CL ≤0.10 ≤0.30 ≤0.60 ≤0.030 ≤0.025 B380CL ≤0.12 ≤0.30 ≤1.20 B420CL ≤0.12 ≤0.30 ≤1.50 B450CL ≤0.10 ≤0.30 ≤1.50 ≤0.030 ≤0.025 B500CL ≤0.12 ≤0.30 ≤1.50 ≤0.030 ≤0.025 B550CL ≤0.12 ≤0.30 ≤2.00 ≤0.030 ≤0.025 B600CL ≤0.15 ≤0.30 ≤2.00 ≤0.030 ≤0.025 B650CL ≤0.15 ≤0.50 ≤2.00 ≤0.030 ≤0.025 B320L ≤0.10 ≤0.30 ≤0.60 ≤0.030 ≤0.035 B420L ≤0.12 ≤0.50 ≤1.50 ≤0.025 B510L ≤0.16 ≤0.50 ≤1.60 ≤0.025 B510DL ≤0.18 ≤0.30 ≤1.60 ≤0.025 ≤0.020 B550L ≤0.16 ≤0.50 ≤1.60 ≤0.030 ≤0.025 B440QZR ≤0.12 ≤0.50 ≤1.30 ≤0.030 ≤0.025 - B480QZR ≤0.16 ≤0.50 ≤1.50 ≤0.035 a As required, other alloy elements may be added to improve the steel performance, and the lower limit of Alt is not required at this point. Table 3 Designation Chemical composition a (mass fraction), % C Si Mn P S Alt Other QStE340TM ≤0.12 ≤0.50 ≤1.30 ≤0.030 ≤0.025 ≥0.015 Nb≤0.09 V≤0.20 Ti≤0.15 QStE380TM ≤1.40 QStE420TM ≤1.50 QStE460TM ≤1.60 QStE500TM ≤1.70 a As required, one or more alloy elements of Nb, V and Ti may be added to improve the steel performance; however, Nb+V+Ti ≤ 0.22%. Table 4 Designation Chemical composition a (mass fraction) (%) C Mn Si P S Alt Nb a V a Ti a Mo B QStE550TM B600L ≤0.12 ≤1.80 ≤0.50 ≤0.025 ≤0.015 ≥0.015 ≤0.09 ≤0.20 ≤0.15 - - QStE600TM B650L ≤0.12 ≤1.90 ≤0.50 ≤0.025 ≤0.015 ≥0.015 ≤0.09 ≤0.20 ≤0.22 ≤0.50 ≤0.005 QStE650TM B700L ≤0.12 ≤2.00 ≤0.60 ≤0.025 ≤0.015 ≥0.015 ≤0.09 ≤0.20 ≤0.22 ≤0.50 ≤0.005 QStE700TM B750L ≤0.12 ≤2.10 ≤0.60 ≤0.025 ≤0.015 ≥0.015 ≤0.09 ≤0.20 ≤0.22 ≤0.50 ≤0.005 a One or more alloy elements of Nb, V and Ti may be added in the steel; however, Nb+V+Ti ≤ 0.22%. 6.4 Surface treatment mode 6.4.1 Surface of steel sheet and strip may be treated by rolling and pickling. 6.4.2 Steel and steel strip with pickling surface may be delivered with or without oil coating. As for steel sheet and strip with oil coating and picking surface, under the normal condition of package, transportation, handle and storage, the supplier ensures that no rust occurs within three months from the date of production, and the oil coating can be removed with alkaline water solution. If the pickled steel sheet and strip delivered with oil coating is required by the purchaser, it shall be indicated in the ordering contract. Pickled steel sheet and strip without oil coating are prone to rust and abrasion during transportation and processing, and the supplier does not guarantee this. 1 Scope 2 Normative References 3 Classification and Designation 4 Ordering Information 5 Dimension, Appearance, Weight and Permissible Deviation 6 Technical Requirements 7 Inspection and Test 8 Package, Mark and Inspection Document 9 Rules for Rounding off of Numerical Values 10 Annex Annex A (Informative) Comparison Table for Similar Designations between This Standard and Relevant Standards Q/BQB 310-2014 代替 Q/BQB 310-2009 BZJ 310-2012 汽车结构用热连轧钢板及钢带 Continuously hot-rolled steel sheet and strip for automobile structural use 2014-05-05 发布 2014-09-01 实施 发布 前 言 本标准按照 GB/T 1.1-2009《标准化工作导则 第一部分:标准的结构和编写》给出的规则起草。 本标准参照 JIS G3113-2006、JIS G3134-2006、EN 10149-2:2013、YB/T 4151-2006 和 GB/T 3273 -2005,并结合宝钢实际情况制定。 本标准代替 Q/BQB 310-2009 和 BZJ 310-2012。 本标准与 Q/BQB 310-2009 相比主要变化如下: ——更新了规范性引用文件版本; ——增加了 QStE550TM、QStE600TM、QStE650TM、QStE700TM 牌号以及相应技术要求; ——增加了 B450CL、B500CL、B550CL、B600CL、B650CL 牌号以及相应技术要求; ——增加了 B600L、B650L、B700L、B750L 牌号以及相应技术要求; ——拓展了表 1 中部分牌号的公称厚度范围; ——调整了表 2 中部分牌号的化学成分 Mn 含量的上限; ——SPFH590 印刷错误纠正; ——增加了附录 A 相近标准对照表中新增牌号对应关系; ——其它编辑性修改。 本标准由宝山钢铁股份有限公司制造管理部提出。 本标准由宝山钢铁股份有限公司制造管理部归口。 本标准由宝山钢铁股份有限公司制造管理部起草。 本标准起草人:韩雨。 本标准所代替标准的历次版本发布情况为:Q/BQB 310-1989,Q/BQB 310-1994,Q/BQB 310-1999, Q/BQB 310-2003,Q/BQB 310-2009。 汽车结构用热连轧钢板及钢带 1 范围 本标准规定了汽车结构用热连轧钢板及钢带的尺寸、外形、技术要求、检验和试验、包装、标志及 检验文件等。 本标准适用于宝山钢铁股份有限公司生产的具有良好冷成型性能的碳素及微合金钢热连轧钢带以 及由此横切成的钢板及纵切成的纵切钢带,以下简称钢板及钢带。产品供制造汽车大梁、横梁、滚型车 轮、汽车传动轴管、汽车桥壳等结构用。 2 规范性引用文件 下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件,仅所注日期的版本适用于本文 件。凡是不注日期的引用文件,其最新版本(包括所有的修改单)适用于本文件。 GB/T 222-2006 钢的成品化学成分允许偏差 GB/T 223 钢铁及合金化学分析方法 GB/T 228.1-2010 金属材料 拉伸试验 第 1 部分:室温试验方法 GB/T 232-2010 金属材料 弯曲试验方法 GB/T 2975-1998 钢及钢产品力学性能试验取样位置及试样制备 GB/T 4336-2002 碳素钢和中低合金钢火花源原子发射光谱分析方法(常规法) GB/T 8170-2008 H 数值修约规则与极限数值的表示和判定 H GB/T 20066-2006 钢和铁 化学成分测定用试样的取样和制样方法 GB/T 20123-2006 钢铁 总碳硫含量的测定 高频感应炉燃烧后红外吸收法(常规方法) Q/BQB 300 热连轧钢板及钢带的包装、标志及检验文件的一般规定 Q/BQB 301 热连轧钢板及钢带的尺寸、外形、重量及允许偏差 3 分类和代号 3.1 钢板及钢带的牌号、公称厚度和用途如表 1 所示。 3.2 按表面处理方式分为: 酸洗表面 轧制表面 3.3 按表面质量级别分为: 普通级表面 FA 较高级表面 FB 3.4 按产品类别分为: 热轧钢带 热轧钢板 热轧纵切钢带 热轧酸洗钢带 热轧酸洗钢板 表1 牌号 公称厚度 a mm 用途 SAPH310 1.5~16.0 用于要求成型加工性能的汽车构架、车轮等汽 车结构件 SAPH370 1.5~12.5 SAPH400 1.5~12.0 SAPH440 1.5~8.0 SPFH540 SPFH590 1.8~6.0 用于要求良好成型加工性能并有高强度要求的 汽车构架、车轮等汽车结构件 QStE340TM、QStE380TM QStE420TM、QStE460TM QStE500TM、QStE550TM 1.5~14.0 用于要求良好的冷成型性能并有较高或高强度 要求的汽车大梁等结构件 QStE600TM、QStE650TM QStE700TM 1.5~12.0 B330CL 1.5~14.0 具有良好的冷成型性能,用于制造汽车滚型车 轮轮辋及轮辐 B380CL B420CL B450CL B500CL B550CL B600CL B650CL B320L 1.5~8.0 供制造汽车大梁、横梁用 B420L 2.0~8.0 B510L 2.0~14.0 B510DL 4.0~8.0 B550L B600L B650L B700L B750L 2.0~12 B440QZR 3.0~8.0 供制造汽车传动轴管用 B480QZR 4.0~8.0 B440QK 3.0~8.0 供制造汽车桥壳用 a 对于热轧酸洗表面钢板及钢带,公称厚度 t≤6.0mm。 4 订货所需信息 4.1 订货时用户需提供下列信息: a) 本企业标准号; b) 产品类别; c) 牌号、表面处理方式及表面质量级别; d) 规格及尺寸(厚度)精度; e) 边缘状态; f)用途; g)检验文件类型。 4.2 在订货合同中的省略事项 4.2.1 未说明表面处理方式时,以轧制表面交货。 4.2.2 对于热轧钢板及钢带,未说明尺寸精度时,除本标准特别规定外,以 Q/BQB 301 中普通厚度精 度交货;未说明边缘状态时,钢带以不切边状态交货,钢板以切边状态交货。 4.2.3 对于热轧酸洗钢板及钢带,除本标准特别规定外,以 Q/BQB 301 中较高厚度精度交货;未说明 边缘状态、表面质量级别和是否涂油时,以切边状态、较高级表面和涂油交货;未说明钢卷内径时,以 钢卷内径 610mm 交货。 5 尺寸、外形、重量及允许偏差 5.1 B330CL~B650CL、B440QZR 、B480QZR 的厚度允许偏差应符合 Q/BQB 301 较高精度(PT.B)的规定。 5.2 其它尺寸、外形、重量及允许偏差按 Q/BQB 301 的规定。 6 技术要求 6.1 牌号及化学成分 6.1.1 钢的牌号及化学成分(熔炼分析)应符合表 2~表 4 的规定。 6.1.2 钢中残余元素的含量应符合下列规定: Cu≤0.20%,Cr≤0.15%,Ni≤0.15%,但在供方能保证钢中残余元素 Cu、Cr、Ni 的含量符合上述规 定时,可不进行这些元素的化学分析。 6.1.3 钢板及钢带的成品化学成分允许偏差应符合 GB/T 222 的规定。 6.2 冶炼方法 钢板及钢带所用的钢为氧气转炉冶炼的镇静钢。 6.3 交货状态 钢板及钢带以热轧或控轧状态交货。 牌号 化学成分 a(质量分数) % C Si Mn P S Alt SAPH310 ≤0.10 ≤0.30 ≤0.60 ≤0.035 ≤0.035 ≥0.010 SAPH370 ≤0.21 ≤0.30 ≤0.75 SAPH400 ≤0.21 ≤0.30 ≤1.40 ≤0.030 ≤0.025 SAPH440 ≤1.60 SPFH540 ≤0.15 ≤0.50 ≤1.80 ≤0.025 ≤0.025 SPFH590 ≤0.18 ≤0.60 ≤2.00 B440QK ≤0.21 ≤0.35 ≤1.80 ≤0.030 ≤0.025 B330CL ≤0.10 ≤0.30 ≤0.60 ≤0.030 ≤0.025 B380CL ≤0.12 ≤0.30 ≤1.20 B420CL ≤0.12 ≤0.30 ≤1.50 B450CL ≤0.10 ≤0.30 ≤1.50 ≤0.030 ≤0.025 B500CL ≤0.12 ≤0.30 ≤1.50 ≤0.030 ≤0.025 B550CL ≤0.12 ≤0.30 ≤2.00 ≤0.030 ≤0.025 B600CL ≤0.15 ≤0.30 ≤2.00 ≤0.030 ≤0.025 B650CL ≤0.15 ≤0.50 ≤2.00 ≤0.030 ≤0.025 B320L ≤0.10 ≤0.30 ≤0.60 ≤0.030 ≤0.035 B420L ≤0.12 ≤0.50 ≤1.50 ≤0.025 B510L ≤0.16 ≤0.50 ≤1.60 ≤0.025 B510DL ≤0.18 ≤0.30 ≤1.60 ≤0.025 ≤0.020 B550L ≤0.16 ≤0.50 ≤1.60 ≤0.030 ≤0.025 B440QZR ≤0.12 ≤0.50 ≤1.30 ≤0.030 ≤0.025 - B480QZR ≤0.16 ≤0.50 ≤1.50 ≤0.035 a 为改善钢的性能,根据需要可添加其它合金元素,此时 Alt 的下限不要求。 表3 牌号 化学成分 a(质量分数) % C Si Mn P S Alt 其它 QStE340TM ≤0.12 ≤0.50 ≤1.30 ≤0.030 ≤0.025 ≥0.015 Nb≤0.09 V≤0.20 Ti≤0.15 QStE380TM ≤1.40 QStE420TM ≤1.50 QStE460TM ≤1.60 QStE500TM ≤1.70 a 为改善钢的性能,根据需要可添加 Nb、V、Ti 中一种或几种合金元素,但 Nb+V+Ti≤0.22%。 牌号 化学成分 a (质量分数) % C Mn Si P S Alt Nba Va Tia Mo B QStE550TM B600L ≤0.12 ≤1.80 ≤0.50 ≤0.025 ≤0.015 ≥0.015 ≤0.09 ≤0.20 ≤0.15 - - QStE600TM B650L ≤0.12 ≤1.90 ≤0.50 ≤0.025 ≤0.015 ≥0.015 ≤0.09 ≤0.20 ≤0.22 ≤0.50 ≤0.005 QStE650TM B700L ≤0.12 ≤2.00 ≤0.60 ≤0.025 ≤0.015 ≥0.015 ≤0.09 ≤0.20 ≤0.22 ≤0.50 ≤0.005 QStE700TM B750L ≤0.12 ≤2.10 ≤0.60 ≤0.025 ≤0.015 ≥0.015 ≤0.09 ≤0.20 ≤0.22 ≤0.50 ≤0.005 a 钢中可添加 Nb、V、Ti 中一种或几种合金元素,但 Nb+V+Ti≤0.22。 6.4 表面处理方式 6.4.1 钢板及钢带的表面处理方式可采用轧制表面和酸洗表面两种方式。 6.4.2 酸洗表面的钢板及钢带,可以涂油或不涂油交货。经涂油后的酸洗钢板及钢带,在正常包装、 运输、搬运和贮存条件下,供方保证自生产完成之日起三个月内不产生锈蚀,所涂油膜应能用碱水溶液 去除。如需方要求以不涂油的酸洗钢板及钢带供货,应在合同中注明。不涂油的酸洗钢板及钢带,在运 输和加工过程中易产生锈蚀和擦伤,供方对此不作保证。 6.5 力学和工艺性能 6.5.1 钢板及钢带的力学和工艺性能应符合相应表 5~表 10 的规定。 6.5.2 弯曲试验后,试样的外侧面不得有肉眼可见的裂纹。供方如能保证弯曲试验合格,可不进行试 验。 表5 牌号 拉伸试验 a 1800 弯曲试验 b d-弯心直径 a-试样厚度 抗拉 强度 Rm/MPa 上屈服强度 c ReH / MPa 断后伸长率 % 公称厚度 mm <6.0 6.0~ <8.0 ≥8.0 1.5~ <2.0 2.0~ <2.5 2.5~ <3.15 3.15~ <4.0 4.0~ <6.3 ≥6.3 <2.0 ≥2.0 SAPH310d ≥310 ≥185 ≥175 ≥33 ≥34 ≥36 ≥38 ≥40 ≥41 d=0a d=2a SAPH370 ≥370 ≥225 ≥215 ≥32 ≥33 ≥35 ≥36 ≥37 ≥38 d=1a SAPH400 ≥400 ≥255 ≥235 ≥31 ≥32 ≥34 ≥35 ≥36 ≥37 d=2a SAPH440 ≥440 ≥305 ≥295 ≥275 ≥29 ≥30 ≥32 ≥33 ≥34 ≥35 d=3a a 拉伸试验规定值适用于纵向试样。拉伸试验取 L =50mm,b=25mm 的试样,即为 GB/T 228.1 中 P14 试样。 0 b 弯曲试验规定值适用于横向试样。弯曲试样宽度 b≥20mm,仲裁试验时 b=20mm。 C 屈服现象不明显时,采用 R 。 p0.2 d 牌号 SAPH310 的上屈服强度为参考值,不作为保证条件。 牌号 拉伸试验 a 1800 弯曲试验 b d-弯心直径 a-试样厚度 上屈服强度 c ReH / MPa 抗拉强度 Rm / MPa 断后伸长率 % 公称厚度 mm 公称厚度 mm <2.0 2.0~<2.5 2.5~<3.25 3.25~6.0 <3.25 ≥3.25 SPFH540 ≥355 ≥540 ≥21 ≥22 ≥23 ≥24 d=2a d=3a SPFH590 ≥420 ≥590 ≥19 ≥20 ≥21 ≥22 d=3a d=3a a 拉伸试验规定值适用于横向试样。拉伸试样 L =50mm,b=25mm,即为 GB/T 228 中 P14 试样。 0 b 弯曲试验规定值适用于横向试样。弯曲试样宽度 b≥20mm,仲裁试验时 b=20mm。 C 屈服现象不明显时,采用 R 。 p0.2 表7 。 表8 牌号 拉伸试验 a 1800 弯曲试验 b d-弯心直径 a-试样厚度 下屈服强度 c ReL / MPa 抗拉强度 Rm / MPa 屈强比 断后伸长率 % L0 5.65 S 0 B330CL ≥225 330~430 - ≥33 d=0a B380CLd 厚度 t≤5.5mm ≥260 380~480 - ≥32 d=0.5a 厚度 t>5.5~10.0mm ≥235 ≥28 厚度 t>10.0~14.0mm ≥220 ≥25 B420CL ≥290 420~520 - ≥28 d=0.5a B450CLd 320~450 450~570 - ≥28 d=0a 表 8(续) 牌号 拉伸试验 a 1800 弯曲试验 b d-弯心直径 a-试样厚度 下屈服强度 c ReL / MPa 抗拉强度 Rm / MPa 屈强比 断后伸长率 % L0 5.65 S 0 B500CLd 380~500 500~620 - ≥26 d=0.5a B550CLd 450~570 550~680 - ≥24 d=0.5a B600CLd 500~620 600~750 - ≥22 d=1a B650CLd 550~680 650~800 - ≥20 d=1a B440QZR ≥320 440~570 - ≥15 d=1a B480QZR ≥355 480~580 - ≥21 B320L ≥215 320~420 - ≥27 d=0a B420L ≥305 420~520 - ≥25 d=0.5a B510L ≥355 510~630 - ≥24 d=0.5a B510DL ≥355 510~630 ≤0.80 ≥24 d=1a B550L ≥400 550~670 - ≥23 d=1a a 拉伸试验规定值适用于横向试样。 b 弯曲试验规定值适用于横向试样。牌号 B440QZR、B480QZR 弯曲试样宽度 b≥20mm,仲裁试验时 b=20mm;其它牌号 弯曲试样宽度 b≥35mm,仲裁试验时 b=35mm。 c 屈服现象不明显时,采用 R 。 p0.2 d 当厚度 t≥10.0mm 时,允许规定的抗拉强度下限降低 10MPa。 表9 牌号 拉伸试验 a 1800 弯曲试验 d-弯心直径 a-试样厚度 上屈服强度 b ReH /MPa 抗拉强度 Rm / MPa 断后伸长率 % L0=80mm,b=20mm L0 5.65 S 0 公称厚度 mm <3 ≥ 3 B600L ≥550 600~760 ≥12 ≥16 d=1.5a B650L ≥600 650~820 ≥11 ≥15 d=1.5a B700L ≥650d 700~880 ≥10 ≥14 d=2a B750L ≥700 d 750~950 ≥10 ≥13 d=2a a 拉伸试验规定值适用于纵向试样。 b 屈服现象不明显时,采用 R 。 p0.2 c 弯曲试验规定值适用于横向试样。弯曲试样宽度 b≥35mm,仲裁试验时b=35mm。 d 当厚度t>8mm时,允许规定的最小屈服强度下降20MPa。 表 10 牌号 拉伸试验 a 1800 弯曲试验 b d-弯心直径 a-试样厚度 下屈服强度 c ReL / MPa 抗拉强度 Rm / MPa 断后伸长率 % B440QK ≥295 ≥440 ≥34 d=1a a 拉伸试验规定值适用于纵向试样。拉伸试样 L =50mm,b=25mm。 0 b 弯曲试验规定值适用于横向试样。弯曲试样宽度 b≥20mm, 仲裁试验时 b=20mm。 c 屈服现象不明显时,采用 R 。 p0.2 6.6 表面质量 6.6.1 钢板及钢带表面不得有裂纹、结疤、折叠、气泡和夹杂等对使用有害的缺陷,钢板及钢带不得 有分层。对酸洗表面的钢板及钢带不得有停车斑。 6.6.2 钢板及钢带按表面质量分为二级,如表 11 示。 6.6.3 对于钢带,由于没有机会切除带缺陷部分,所以钢带允许带有缺陷交货,但有缺陷的部分不得 超过每卷总长度的 6%。 表 11 级别 适用的表面处理方式 特征 普通级表面(FA) 轧制表面 酸洗表面 表面允许有深度(或高度)不超过钢板厚度公差之半的麻点、凹 面、划痕等轻微、局部的缺欠,但应保证钢板及钢带允许的最小 厚度。 较高级表面(FB) 酸洗表面 表面允许有不影响成型性的局部缺欠,如轻微划伤、轻微压痕、 轻微麻点、轻微辊印及色差等。 7 检验和试验 7.1 钢板及钢带的外观用肉眼检查。 7.2 钢板及钢带的尺寸和外形应用合适的测量工具检查。 7.3 检验文件类型在选用规定的检验和试验时,应符合 7.4~7.6 条款规定。 7.4 每批钢板及钢带所需检验项目、试样数量、取样方法、试验方法应符合表 12 规定。 表 12 序号 试验项目 试样数量,个 取样方法 试验方法 1 化学分析 a 1(每炉) GB/T 20066 GB/T 223、GB/T 4336、GB/T 20123 2 拉伸试验 1/批 GB/T 2975 GB/T 228.1 3 弯曲试验 1/批 GB/T 2975 GB/T 232 a 对化学成分进行仲裁试验时,按 GB/T 223。 7.5 取样频率 7.5.1 化学成分分析的取样频率 按炉对化学成分进行熔炼分析。 7.5.2 力学性能和工艺性能的取样频率 钢板及钢带应按批验收,每批应由重量不大于 70t 的同炉号、同牌号、同厚度、同交货状态的钢板 或钢带组成。 注:经供需双方协商,可另确定检验批重量。 7.6 复验 7.6.1 如有某一项试验结果不符合标准要求,则从同一批中再任取双倍数量的试样进行该不合格项目 的复验。 7.6.2 复验结果(包括该项目试验所要求的所有指标)合格,则整批合格。复验结果(包括该项目试 验所要求的所有指标)即使有一个指标不合格,则复验不合格。 7.6.3 如复验不合格,则已做试验且试验结果不合的单件不能验收,但该批材料中未做试验的单件可 逐件重新提交试验和验收。 8 包装、标志和检验文件 钢板及钢带的包装、标志和检验文件应符合 Q/BQB 300 的规定。 9 数值修约规则 数值修约规则应符合 GB/T 8170 的规定。 10 附录 本标准与相关标准相近牌号对照表见附录 A(资料性附录)。 附录 A (资料性附录) 本标准与相关标准相近牌号对照表 A.1 本标准与相关标准相近牌号对照表见表 A.1~表 A.5。 表 A.1 Q/BQB 310-2014 YB/T 4151-2006 B330CL 330CL B380CL 380CL B420CL - B450CL 440CL B500CL 490CL B550CL 540CL B600CL 590CL B650CL - 表 A.2 Q/BQB 310-2014 GB/T 3273-2005 B320L - B420L 420L B510L 510L B510DL - B550L 550L 表 A.3 Q/BQB 310-2014 JIS G 3113-2006 SAPH310 SAPH310 SAPH370 SAPH370 SAPH400 SAPH400 SAPH440,B440QK SAPH440 表 A.4 Q/BQB 310-2014 JIS G 3134-2006 SPFH540 SPFH540 SPFH590 SPFH590 表 A.5 Q/BQB 310- 2014 BZJ 310- 2012 SEW 092:95 EN10149- 2:2013 ISO 6930- 1:2001 SAE J1392:2008 GB/T 20887.1- 2007 QStE340TM QStE360TM S355MC FeE355 050XLK HR355F QStE380TM QStE380TM - - - HR380F 表 A.5 (续) Q/BQB 310- 2014 BZJ 310- 2012 SEW 092:95 EN10149- 2:2013 ISO 6930- 1:2001 SAE J1392:2008 GB/T 20887.1- 2007 QStE420TM QStE420TM S420MC FeE420 060XLK HR420F QStE460TM QStE460TM S460MC FeE460 - HR460F QStE500TM QStE500TM S500MC FeE500 070XLK HR500F QStE550TM B600L QStE550TM B600L QStE550TM S550MC FeE550 080XL HR550F QStE600TM B650L QStE600TM B650L QStE600TM S600MC FeE600 HR600F QStE650TM B700L QStE650TM B700L QStE650TM S650MC FeE650 HR650F QStE700TM B750L QStE700TM B750L QStE690TM S700MC FeE700 HR700F |
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Q/BQB 310-2014, Q/BQBT 310-2014, QBQBT 310-2014, Q/BQB310-2014, Q/BQB 310, Q/BQB310, Q/BQBT310-2014, Q/BQBT 310, Q/BQBT310, QBQBT310-2014, QBQBT 310, QBQBT310 |