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汽车用高强度冷连轧钢板及钢带 第1部分：烘烤硬化钢
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GBT 20564.1-2017
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标准编号: GB/T 20564.1-2017 (GB/T20564.1-2017)
中文名称: 汽车用高强度冷连轧钢板及钢带 第1部分：烘烤硬化钢
英文名称: Continuously cold rolled high strength steel sheet and strip for automobile -- Part 1: Bake hardening steel
行业: 国家标准 (推荐)
中标分类: H46
字数估计: 9,996
发布日期: 2017-09-07
实施日期: 2018-06-01
旧标准 (被替代): GB/T 20564.1-2007
起草单位: 宝山钢铁股份有限公司、首钢总公司、本钢集团有限公司、冶金工业信息标准研究院、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 20564.1-2017: 汽车用高强度冷连轧钢板及钢带 第1部分：烘烤硬化钢
GB/T 20564.1-2017 英文名称: Continuously cold rolled high strength steel sheet and strip for automobile -- Part 1: Bake hardening steel
1 范围
GB/T 20564的本部分规定了冷轧烘烤硬化高强度钢板及钢带的术语和定义、分类和牌号表示方
法、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外板、内板和部分结构件等用厚度为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 223.5 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 223.16 钢铁及合金化学分析方法 变色酸光度法测定钛量
GB/T 223.40 钢铁及合金 铌含量的测定 氯磺酚S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 223.86 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 5027 金属材料 薄板和薄带 塑性应变比(r值)的测定
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
GB/T 24174 钢 烘烤硬化值(BH2)的测定方法
3 术语和定义
下列术语和定义适用于本文件。
3.1
烘烤硬化钢
在钢中保留一定量的固溶碳、氮原子,同时可通过添加磷、锰等强化元素来提高强度。加工成形后,在
一定温度下烘烤后,由于时效硬化使钢的屈服强度进一步升高。
3.2
拉伸应变痕
加工成形时由于时效的原因导致钢板表面出现滑移线、橘子皮等的现象。
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英文“Cold Roled”首字母“CR”、规定的最小屈服强度值、烘烤硬化英
文“BakeHardening”的首字母“BH”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 钢板及钢带以退火后平整状态交货。
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,钢板及钢带表面不生锈。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(不包括烘烤硬化值)符合表4
的规定。
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 供方应保证自制造完成之日起3个月内,钢板及钢带的烘烤硬化值符合表4的规定。
7.4.3 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。
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)。
c 厚度不小于1.6mm且小于2.0mm时,r90值允许降低0.2;厚度不小于2.0mm时,r90值和n90值不做要求。
7.5 拉伸应变痕
室温储存条件下,对于表面质量要求为FC和FD的钢板及钢带。应保证自制造完成之日起3个月
内使用时不出现拉伸应变痕。
7.6 表面质量
7.6.1 钢板及钢带表面不应有结疤、裂纹、夹杂等对使用有害的缺陷,钢板及钢带不应有分层。
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%。
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 223.5、GB/T 223.9、GB/T 223.16、GB/T 223.40、GB/T 223.59、GB/T 223.64、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 223.5、GB/T 223.9、GB/T 223.16、GB/T 223.40、GB/T 223.59、GB/T 223.64、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,测抗拉强度速率为40%Lc/min(Lc为试样的平行长度)。
8.4 r值是在15%应变时计算得到的,均匀延伸小于15%时,以均匀延伸结束时的应变计算。n值是
在10%~20%应变范围内计算得到的,均匀延伸小于20%时,应变范围为10%至均匀延伸结束时的
应变。
GB/T 20564.1-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 20564.1-2007
Continuously Cold Rolled High Strength
Steel Sheet and Strip for Automobile –
Part 1. Bake Hardening Steel
ISSUED ON. SEPTEMBER 07, 2017
IMPLEMENTED ON. JUNE 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
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 Contents . 8
6 Dimension, Appearance, Weight . 9
7 Technical Requirements .. 9
8 Test Methods . 11
9 Inspection Rules . 12
10 Package, Mark and Quality Certificate .. 13
Appendix A (Informative) Chemical Compositions of Steel .. 14
Appendix B (Informative) Approximate Comparison between Domestic and
Foreign Grades .. 15
Foreword
GB/T 20564 Continuously Cold Rolled High Strength Steel Sheet and Strip for
Automobile can be divided into 11 parts.
--- Part 1. Bake 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 1 of GB/T 20564.
This Part was drafted as per the rules specified in GB/T 1.1-2009.
This Part replaced GB/T 20564.1-2007 Continuously Cold Rolled High Strength Steel
Sheet and Strip for Automobile – Part 1. Bake Hardening Steel; compared with GB/T
20564.1-2007, this Part has the major technical changes as follows.
--- Modify the nominal thickness range (see Clause 1 of this Edition; Clause 1 of
Edition 2007);
--- Add risk warning for non-oiled products and regulations on production completion
date (see 7.3.2 of this Edition);
--- Add explanation on the guarantee period of mechanical properties (see 7.4.1 of
this Edition);
--- Add provisions for the mechanical properties, when supplying products as per
the specified parts (see 7.4.3 of this Edition);
Continuously Cold Rolled High Strength
Steel Sheet and Strip for Automobile –
Part 1. Bake Hardening Steel
1 Scope
This Part of GB/T 20564 specifies the terms and definitions, classification and grade
expression method, dimension, shape, weight, technical requirements, test methods,
inspection rules, package, marking and quality certificate of cold rolled bake hardening
high strength steel sheet and strip.
This Part is applicable to the steel sheet and strip with thickness of 0.50mm ~ 3.00mm
(hereinafter referred to as “steel sheet and strip”) used for manufacturing automobile
external and internal plates and partial structures.
2 Normative References
The following documents are essential to the application of this document. For the
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 223.5 Steel and Iron - Determination of Acid-Soluble Silicon and Total Silicon
Content - Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9 Iron Steel and Alloy - Determination of Aluminum Content - Chrom
Azurol S Photometric Method
GB/T 223.16 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Chromotropic Acid Photometric Method for the Determination of Titanium Content
GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the
GB/T 223.59 Iron, Steel and Alloy - Determination of Phosphorus Content -
Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony
Phosphomolybdate Blue Spectrophotometric Method
GB/T 223.64 Iron, Steel and Alloy - Determination of Manganese Content - Flame
Atomic Absorption Spectrometric Method
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
and Strips
GB/T 708 Dimension, Shape, Weight, and Tolerance for Cold-Rolled Steel Plate
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
GB/T 5027 Metallic Materials-Sheet and Strip - Determination of Plastic Strain
Ratio (r-values)
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
Judgement of Limiting Values
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
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.
5.2 If the ordering contract doesn’t specify the dimension and roughness accuracy,
surface quality level, surface structure type, edge state and package, etc.; then the
products in this Part shall be delivered as per the ordinary dimension and roughness
accuracy, relative-high surface, pitting surface structure, cutting edge state; and the
6 Dimension, Appearance, Weight
The dimension, appearance, weight and allowable tolerance of steel sheet and strip
shall conform to the provisions of GB/T 708.
7 Technical Requirements
7.1 Chemical compositions
The reference values for the chemical compositions (smelting analysis) of steel can
refer to Appendix A. If the purchaser has the requirements for the chemical
compositions; it shall be negotiated when ordering. Approximate comparison between
domestic and foreign standard grades can refer to Appendix B.
The steel used for steel sheet and strip shall be smelted by oxygen converter or electric
furnace; unless otherwise specified, the smelting method shall be selected by the
supplier.
7.3 Delivery state
7.3.1 Steel sheet and strip shall be delivered in a flat state after annealing.
7.3.2 Steel sheet and strip are usually supplied with oil; the applied oil film shall be
removed by aqueous alkaline solution or conventional solution; under general
packaging, transporting, loading/unloading, storing conditions, the supplier shall
guarantee that the steel sheet and strip surface shall not become rusty within 6 months
shall be supplied without oil, it shall be negotiated when ordering.
NOTE. for the non-oiled products required by the purchaser, they may become rusty, or the
surface may be slightly scratched during the transporting, loading/unloading, storing and using
period.
7.4 Mechanical properties
7.4.1 The supplier shall guarantee that the mechanical properties (excluding the
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