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汽车用高强度冷连轧钢板及钢带第2部分：双相钢
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GBT 20564.2-2017
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标准编号: GB/T 20564.2-2017 (GB/T20564.2-2017)
中文名称: 汽车用高强度冷连轧钢板及钢带第2部分：双相钢
英文名称: Continuously cold rolled high strength steel sheet and strip for automobile -- Part 2: Dual phase steel
行业: 国家标准 (推荐)
中标分类: H46
国际标准分类: 77.140.50
字数估计: 10,10
发布日期: 2017-09-07
实施日期: 2018-06-01
旧标准 (被替代): GB/T 20564.2-2006
起草单位: 宝山钢铁股份有限公司、冶金工业信息标准研究院、本钢集团有限公司、首钢总公司、新余钢铁股份有限公司、鞍钢股份有限公司、邯郸钢铁集团有限责任公司
归口单位: 全国钢标准化技术委员会(SAC/TC 183)
提出机构: 中国钢铁工业协会
发布机构: 中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会
GB/T 20564.2-2017: 汽车用高强度冷连轧钢板及钢带第2部分：双相钢
GB/T 20564.2-2017 英文名称: Continuously cold rolled high strength steel sheet and strip for automobile -- Part 2: Dual phase steel
1 范围
GB/T 20564的本部分规定了冷轧双相高强度钢板及钢带的术语和定义、分类和牌号表示方法、订货内容、尺寸、外形、重量、技术要求、试验方法、检验规则、包装、标志及质量证明书。
本部分适用于制造汽车结构件、加强件以及部分内外板用厚度为0.50mm~3.00mm的钢板及钢
带(以下简称“钢板及钢带”)。
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 223.4 钢铁及合金 锰含量的测定 电位滴定或可视滴定法
GB/T 223.5 钢铁 酸溶硅和全硅含量的测定 还原型硅钼酸盐分光光度法
GB/T 223.9 钢铁及合金 铝含量的测定 铬天青S分光光度法
GB/T 223.12 钢铁及合金化学分析方法 碳酸钠分离-二苯酸铣二肼光度法测定铬量
GB/T 223.26 钢铁及合金 钼含量的测定 硫氰酸盐分光光度法
GB/T 223.59 钢铁及合金 磷含量的测定 铋磷钼蓝分光光度法和锑磷钼蓝分光光度法
GB/T 223.64 钢铁及合金 锰含量的测定 火焰原子吸收光谱法
GB/T 223.78 钢铁及合金化学分析方法 姜黄素直接光度法测定硼含量
GB/T 223.86 钢铁及合金 总碳含量的测定 感应炉燃烧后红外吸收法
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 247 钢板和钢带包装、标志及质量证明书的一般规定
GB/T 708 冷轧钢板和钢带的尺寸、外形、重量及允许偏差
GB/T 2523 冷轧金属薄板(带)表面粗糙度和峰值数测量方法
GB/T 2975 钢及钢产品 力学性能试验取样位置及试样制备
GB/T 4336 碳素钢和中低合金钢 多元素含量的测定 火花放电原子发射光谱法(常规法)
GB/T 5028 金属材料 薄板和薄带 拉伸应变硬化指数(n值)的测定
GB/T 8170 数值修约规则与极限数值的表示和判定
GB/T 17505 钢及钢产品 交货一般技术要求
GB/T 20066 钢和铁 化学成分测定用试样的取样和制样方法
GB/T 20123 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)
GB/T 20125 低合金钢 多元素含量的测定 电感耦合等离子体原子发射光谱法
GB/T 20126 非合金钢 低碳含量的测定 第2部分:感应炉(经预加热)内燃烧后红外吸收法
3 术语和定义
下列术语和定义适用于本文件。
3.1
双相钢
钢的显微组织主要为铁素体和马氏体,也可有少部分贝氏体组织。
注:双相钢不仅具有较高的抗拉强度水平,而且具有较低的屈强比和较高的加工硬化率。
4 分类和牌号表示方法
4.1 分类
4.1.1 钢板及钢带按用途分类见表1。
4.1.2 钢板及钢带按表面质量分类见表2。
4.1.3 钢板及钢带按表面结构分类见表3。
4.2 牌号表示方法
钢板及钢带的牌号由冷轧的英文“ColdRoled”首字母“CR”、规定的最小屈服强度值/规定的最小
抗拉强度值、双相英文“DualPhase”首字母“DP”三个部分组成。
5 订货内容
5.1 按本部分订货的合同或订单应包括下列内容:
a) 产品名称(钢板或钢带);
b) 本部分编号;
c) 牌号;
d) 规格及尺寸、不平度精度;
e) 表面质量级别;
f) 表面结构;
g) 边缘状态;
h) 包装方式;
i) 重量;
j) 用途。
5.2 如订货合同中未注明尺寸和不平度精度、表面质量级别、表面结构种类、边缘状态及包装等信息,则本部分产品按普通的尺寸和不平度精度、较高级表面、表面结构为麻面、切边状态供货,并按供方提供的包装方式包装。
6 尺寸、外形、重量
钢板及钢带的尺寸、外形、重量及允许偏差应符合GB/T 708的规定。
7 技术要求
7.1 化学成分
钢的化学成分(熔炼分析)参考值参见附录A。如需方对化学成分有要求,应在订货时协商。国内
外标准牌号的近似对照参见附录B。
7.2 冶炼方法
钢板及钢带所用的钢采用氧气转炉或电炉冶炼,除非另有规定,冶炼方式由供方选择。
7.3 交货状态
7.3.1 钢板及钢带通常以退火后平整状态交货,经供需双方协商,也可不平整交货。
7.3.2 钢板及钢带通常涂油供货,所涂油膜应能用碱水溶液或通常的溶液去除,在通常的包装、运输、装卸和储存条件下,供方应保证自制造完成之日起6个月内,钢板钢带表面不生锈。如需方要求不涂油供货,应在订货时协商。
注:对于需方要求的不涂油产品,可能产生锈蚀,也可能在运输、装卸、储存和使用过程中表面易产生轻微划伤。
7.4 力学性能
7.4.1 供方应保证自制造完成之日起6个月内,钢板及钢带的力学性能符合表4的规定。如需方对烘
烤硬化值有要求,应在订货时协商。
注:由于时效的影响,钢板及钢带的力学性能会随着储存时间的延长而变化,如屈服强度和抗拉强度的上升,断后伸长率的下降,成形性能变差,出现拉伸应变痕等,建议用户尽早使用。
7.4.2 当钢板及钢带按指定零件供货时,供需双方可商定一个满足该零件加工需求的力学性能范围作为验收基准,此时,表4规定的力学性能将不再作为交货的依据。
a 当屈服现象不明显时,可采用规定塑性延伸强度Rp0.2代替。
b 厚度不大于0.7mm时,断后伸长率最小值可以降低2%(绝对值)。
7.5 焊接
用户宜根据化学成分和强度级别确定合适的焊接工艺,必要时可咨询生产商。
7.6 表面质量
7.6.2 钢板及钢带各表面质量应符合表5的规定。
7.6.3 对于钢带,由于没有机会切除带缺陷部分,因此允许带缺陷交货,但有缺陷部分应不超过每卷总长度的6%。
7.7 表面结构
钢板及钢带的表面结构应符合表6的规定。如需方对粗糙度有特殊要求,应在订货时协商。
8 试验方法
8.1 钢的化学成分分析方法按GB/T 223.4、GB/T 223.5、GB/T 223.9、GB/T 223.12、GB/T 223.26、GB/T 223.59、GB/T 223.64、GB/T 223.78、GB/T 223.86、GB/T 4336、GB/T 20123、GB/T 20125、GB/T 20126或通用方法的规定进行,但仲裁时应按 GB/T 223.4、GB/T 223.5、GB/T 223.9、GB/T 223.12、GB/T 223.26、GB/T 223.59、GB/T 223.64、GB/T 223.78、GB/T 223.86的规定进行。
8.2 钢板及钢带的检验项目和试验方法应符合表7的规定。
8.3 拉伸试验应按照GB/T 228.1-2010的方法B。为了改善测量结果的再现性,推荐采用横梁位移
控制方法,测屈服强度速率为5%Lc/min(Lc为试样的平行长度)。
应变范围为10%至均匀延伸结束;当均匀延伸率小于12%时,应变硬化指数应按照均匀延伸率结束点计算的真应变值报告(n均匀延伸=ε均匀延伸)。
9 检验规则
9.1 钢板及钢带的检查和验收由供方检验部门进行。
9.2 钢板及钢带应成批验收,每个检验批应由同一牌号、同一规格、同一加工状态的钢板或钢带组成。
每批的重量应不大于30t,对于卷重大于30t的钢带,每卷作为一个检验批。
9.3 钢板及钢带的取样数量和取样方法应符合表7的规定。
9.4 钢板及钢带的复验与判定规则应符合GB/T 17505的规定。
9.5 化学成分和力学性能的检测结果按修约值比较法进行修约,修约规则按GB/T 8170的规定。
10 包装、标志及质量证明书
订货时协商。
GB/T 20564.2-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 20564.2-2006
Continuously Cold Rolled High
Strength Steel Sheet and Strip for
Automobile – Part 2. Dual Phase Steel
ISSUED ON. SEPTEMBER 7, 2017
IMPLEMENTED ON. JUNE 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
3. No action is required - Full-copy of this standard will be automatically &
immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 7
4 Classification and Grade Expression Method ... 7
5 Ordering Content ... 8
6 Dimension, Shape and Weight ... 9
7 Technical Requirements ... 9
8 Test Methods ... 11
9 Inspection Rules ... 12
10 Package, Marking and Quality Certificate ... 12
Appendix A (Informative) Chemical Compositions of Steel ... 14
Appendix B (Informative) Approximate Comparison between National and
International Grades ... 15
Foreword
GB/T 20564 Continuously Cold Rolled High Strength Steel Sheet and Strip can be
divided into the following 11 parts.
--- Part 1. Brake Hardening Steel;
--- Part 2. Dual Phase Steel;
--- Part 3. High Strength Interstitial Free Steel;
--- Part 4. High Strength Low Alloy Steel;
--- Part 5. Isotropic Steel;
--- Part 6. Transformation Induced Plasticity Steel;
--- Part 7. Martensitic Steel;
--- Part 8. Complex Phase Steel;
--- Part 9. Quenching and Partitioning Steel;
--- Part 10. Twinning Induced Plasticity Steel;
--- Part 11. Carbon Manganese Steel.
This Part belongs to Part 2 of GB/T 20564.
This Part was drafted as per the rules specified in GB/T 1.1-2009.
This Part replaced GB/T 20564.2-2006 Continuously Cold Rolled High Strength Steel
Sheet and Strip – Part 2. Dual Phase Steel. Compared with GB/T 20564.2-2006, this
Part has the major technical changes as follows.
--- Modified the nominal thickness range (see Clause 1 of this Edition; Clause 1 of
2006 Edition);
--- Modified the definition of dual phase steel (see 3.1 of this Edition; 3.1 of 2006
Edition);
--- Added the usage classification of steel sheet and strip (see 4.2 of this Edition);
--- Deleted the quality requirements for the super-high grade of surface (see 4.2 of
2006 Edition);
--- Added the risk warnings for non-oiled products and regulations on production
completion date (see 7.3.2 of this Edition);
Continuously Cold Rolled High
Strength Steel Sheet and Strip for
Automobile – Part 2. Dual Phase Steel
1 Scope
This Part of GB/T 20564 specifies the terms and definitions, classification and grade
expression method, ordering content, dimension, shape, weight, technical
requirements, test methods, inspection rules, package, marking and quality certificate
of cold rolled high strength dual phase steel sheet and strip.
This Part is applicable to the steel sheet and strip with thickness of 0.50mm~3.00mm
for manufacturing automotive structural parts, reinforcement parts and some internal
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 document.
GB/T 223.4 Iron, Steel and Alloy – Determination of Manganese Content –
Potentiometric or Visual Titration Method
GB/T 223.5 Steel and Iron - Determination of Acid-Soluble Silicon and Total Silicon
Content - Reduced Molybdosilicate Spectrophotometric Method
Azurol S Photometric Method
GB/T 223.12 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium
Carbonate Separation-Diphenyl Carbazide Photometric Method for the
Determination of Chromium Content
GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The
Thiocyanate Spectrophotometric Method
GB/T 223.59 Iron, Steel and Alloy - Determination of Phosphorus Content -
Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony
Phosphomolybdate Blue Spectrophotometric Method
Atomic Absorption Spectrometric Method
GB/T 223.78 Methods for Chemical Analysis of Iron, Steel and Alloy - Curcumin
Spectrophotometric Method for the Determination of Boron Content
GB/T 223.86 Steel and Iron - Determination of Total Carbon Content - Infrared
Absorption Method after Combustion in an Induction Furnace
GB/T 228.1-2010 Metallic Materials - Tensile Testing - Part 1. Method of Test at
Room Temperature
GB/T 247 General Rule of Acceptance, Package, Mark and Certification for Steel
Sheet and Strip
GB/T 2523 Measuring Method of Surface Roughness and Peak Count for Cold-
Rolled Metal Sheet (Strip)
GB/T 2975 Steel and Steel Products - Location and Preparation of 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 5028 Metallic Materials - Sheet and Strip - Determination of Tensile Strain
Hardening Exponent (N-Values)
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements
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.
type, edge state, package and the like information are not indicated in the ordering
contract; then the products in this Part shall be delivered as per the ordinary dimension
and roughness accuracy, relative high-level surface, pitted surface structure and
cutting edge state; and packaged as per the packaging mode provided by the supplier.
6 Dimension, Shape and Weight
The dimension, shape, weight and allowable deviation of steel sheet and strip shall
conform to the provisions of GB/T 708.
7 Technical Requirements
7.1 Chemical compositions
Appendix A. If the purchaser has the demand for the chemical compositions, it shall
be negotiated when ordering. The approximate comparison between the national and
international standard grades can refer to Appendix B.
7.2 Smelting method
The steel for steel sheet and strip be smelted by oxygen converter or electric furnace;
unless otherwise is specified, the smelting mode shall be selected by the supplier.
7.3 Delivery state
7.3.1 Generally, the steel sheet and strip shall be delivered in a flattened state after
annealing and can also be delivered in rough state through the negotiation between
7.3.2 The steel sheet and strip shall be supplied with oil painting; the painted oil film
can be removed by alkaline solution or usual solution; under the normal packaging,
transporting, loading and unloading, and storing conditions, the supplier shall
guarantee that the steel sheet and strip surface won’t rust within 6 months since the
manufacture completion date. If the purchaser requires to deliver the product without
oil painting, then it shall be negotiated when ordering.
NOTE. for the purchaser required non-oiled products, it may generate rust; may also generate
slight scratches during the transporting, loading and unloading, storing and using process.
7.4 Mechanical properties
conform to the provisions of Table 4 within 6 months since the manufacture completion
date.
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