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汽车用高强度热连轧钢板及钢带 第7部分：液压成形用钢
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GBT 20887.7-2017
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标准编号: GB/T 20887.7-2017 (GB/T20887.7-2017)
中文名称: 汽车用高强度热连轧钢板及钢带 第7部分：液压成形用钢
英文名称: Continuously hot rolled high strength steel sheet and strip for automobile -- Part 7: Steels for hydraulic forming
行业: 国家标准 (推荐)
中标分类: H46
字数估计: 7,759
发布日期: 2017-09-07
实施日期: 2018-06-01
起草单位: 鞍钢股份有限公司、首钢总公司、冶金工业信息标准研究院
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 20887.7-2017: 汽车用高强度热连轧钢板及钢带 第7部分：液压成形用钢
GB/T 20887.7-2017 英文名称: Continuously hot rolled high strength steel sheet and strip for automobile -- Part 7: Steels for hydraulic forming
1 范围GB/T 20887的本部分规定了热轧液压成形用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副车架、仪表盘支架等结构件用厚度不大于6mm的钢带以及由钢带横切成的钢板和纵切成的纵切钢带(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 222 钢的成品化学成分允许偏差
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 223.62 钢铁及合金化学分析方法 乙酸丁酯萃取光度法测定磷量
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 223.76 钢铁及合金化学分析方法 火焰原子吸收光谱法测定钒量
GB/T 223.79 钢铁 多元素含量的测定 X-射线荧光光谱法(常规法)
GB/T 223.85 钢铁及合金 硫含量的测定 感应炉燃烧后红外吸收法
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 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 709 热轧钢板和钢带的尺寸、外形、重量及允许偏差
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
3 术语和定义下列术语和定义适用于本文件。
3.1液压成形利用液体作为传力介质或模具使工件成形的一种塑性加工技术。
3.2液压成形用钢 用于液压成形的钢板及钢带,其特点为钢质纯净,性能均匀,具有较高的延伸率和n值。
4 分类和牌号表示方法
4.1 分类
4.1.1 钢板及钢带的表面状态分为热轧表面和热轧酸洗表面,当表面状态为热轧酸洗表面时,以代号“P”表示。
4.1.2 钢板及钢带的表面质量分为普通级表面(FA)和较高级表面(FB)。
4.2 牌号表示方法钢板及钢带的牌号由热轧英文“HotRoled”首字母“HR”、规定的最小抗拉强度值、液压成形英文“HydraulicForming”首字母“HF”三部分组成。
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) 表面状态(酸洗表面时,以代号“P”表示);
g) 边缘状态;h) 是否涂油;
i) 用于制管时的制管方式(电阻焊ERW、激光焊LBW等);
j) 重量。
5.2 如订货合同中未注明厚度精度、表面质量级别、边缘状态及是否涂油等信息时,则本部分产品按普通厚度精度、普通级表面(FA)、切边状态和涂油供货。
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 709的规定。
7 技术要求7.1 牌号和化学成分
7.1.1 钢的牌号和化学成分(熔炼分析)应符合表1的规定。
7.1.2 成品钢板及钢带的化学成分允许偏差应符合GB/T 222的规定。
7.2 冶炼方法钢板及钢带所用的钢采用氧气转炉冶炼,并进行炉外精炼处理。除非另有规定,冶炼方法由供方选择。
7.3 交货状态
7.3.1 钢板及钢带通常以热轧酸洗状态交货。
7.3.2 钢板及钢带为热轧酸洗表面时,通常涂油供货,所涂油膜应能用碱水溶液去除,在通常的包装、运输、装卸及贮存条件下,供方应保证自制造完成之日起3个月内,钢板及钢带表面不生锈。经供需双方协商,并在合同中注明,热轧酸洗表面也可不涂油供货。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 力学性能钢板及钢带的力学性能应符合表2的规定。
7.5 表面质量
7.5.1 钢板及钢带表面不应有裂纹、气泡、夹杂、结疤和折叠等对使用有害的缺陷。钢板及钢带不应有分层。
7.5.2 钢板及钢带的各表面质量应符合表3的规定。
7.5.3 对于钢带,由于没有机会切除带缺陷的部分,因此允许带缺陷,但有缺陷的部分不得超过每卷总长度的6%。
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 223.62、GB/T 223.64、GB/T 223.76、GB/T 223.79、GB/T 223.85、GB/T 223.86、GB/T 4336、GB/T 20123、GB/T 20125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 223.62、GB/T 223.64、GB/T 223.76、GB/T 223.79、GB/T 223.85、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4的规定。
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。每批应由重量不大于60t的同一牌号、同一炉号、同一厚度和同一轧制制度的钢板或钢带组成。轧制卷重大于30t的钢带和连轧板可按两个轧制卷组批。
9.3 钢板及钢带的取样数量和取样方法应符合表4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、标志及质量证明书钢板及钢带的包装、标志及质量证明书应符合GB/T 247或订货合同的规定。
GB/T 20887.7-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Continuously hot rolled high strength
steel sheet and strip for automobile –
Part 7. Steels for hydraulic forming
ISSUED ON. SEPTEMBER 7, 2017
IMPLEMENTED ON. JUNE 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 6
4 Classification and designation ... 6
5 Ordering content ... 7
6 Dimensions, shapes and weights ... 7
7 Technical requirements ... 7
8 Test method ... 9
9 Inspection rules ... 10
10 Packaging, marking and quality certification... 11
Foreword
GB/T 20887, Continuously hot rolled high strength steel sheet and strip for automobile,
comprises 7 parts.
-- Part 1. High yield strength steel for cold forming;
-- Part 2. High hole expansion steel;
-- Part 3. Dual phase steel;
-- Part 4. Transformation induced plasticity steel;
-- Part 5. Martensitic steel;
-- Part 6. Complex phase steel;
-- Part 7. Steels for hydraulic forming.
This Part is Part 7 of GB/T 20887.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part was proposed by China Iron and Steel Association.
This Part shall be under the jurisdiction of National Technical Committee on Steels of
Standardization Administration of China (SAC/TC 183).
The drafting organizations of this Part. Ansteel Co., Ltd., Shougang Group, China
Metallurgical Information and Standardization Institute.
The main drafters of this Part. Lv Dong, Guan Jichun, Wu Zhaohui, Zhang Weixu, Liu
Rendong, Shi Li, Li Qian.
Continuously hot rolled high strength
steel sheet and strip for automobile -
Part 7. Steels for hydraulic forming
1 Scope
This Part of GB/T 20887 specifies the terms and definitions, classification and
designation, ordering content, dimensions, shapes, weights, technical requirements,
test methods, inspection rules, packaging, marking and quality certification of
continuously hot rolled high strength steel sheet and strip.
This Part applies to steel strip of thickness not greater than 6 mm, and steel sheet
transversely cut or steel strip longitudinally cut from steel strip, which are used for the
structural parts of automobile such as auxiliary frames and dashboard supports
(hereinafter referred to as “steel sheet and strip”).
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to this document.
GB/T 222, Permissible tolerances for chemical composition of steel products
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 aluminium 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 titaninm content
sulphochlorophenol S spectrophotometric method
GB/T 223.62, Methods for chemical analysis of iron, steel and alloy – The butyl
acetate extraction photometric method for the determination of phosphorus
content
GB/T 223.64, Iron, steel and alloy - Determination of manganese content - Flame
atomic absorption spectrometric method
GB/T 223.76, Methods for chemical analysis of iron, steel and alloy – The flame
atomic absorption spectrometric method for the determination of vanadium
content
fluorescence spectrometry(Routine method)
GB/T 223.85, Steel and iron – Determination of sulfur content – Infrared absorption
method after combustion in an induction furnace
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, Metallic materials – Tensile testing – Part 1 . Method of test at room
temperature
GB/T 247, General rule of package, mark and certification for steel plates (sheets)
and strips
strips
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 5028, Metallic materials – Sheet and strip – Determination of tensile strain
hardening exponent
GB/T 8170, Rules of rounding off for numerical values and 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
HF – initials of “Hydraulic Forming” in English.
5 Ordering content
5.1 The contract or order based on this Part shall include the following content.
a) product name (steel sheet or strip);
b) a reference to this Part;
d) specifications, dimensions and roughness accuracy;
e) surface quality level;
f) surface condition (when it is an acid pickled surface, it is represented by “P”);
g) edge condition;
h) oil coated or not;
i) control method when used for control (such as electric resistance welding ERW
and laser welding LBW);
j) weight;
k) other special requirements.
quality level, edge condition and whether oil is coated or not, then the products of this
Part are supplied in accordance with the normal thickness accuracy, common level
surface (FA), trimmed condition and oil coated condition.
6 Dimensions, shapes and weights
The dimensions, shapes and weights and tolerances for steel sheet and strip shall be
as specified in GB/T 709.
7 Technical requirements
7.1 Designations and chemical compositions
7.1.1 The designations and chemical composition (by smelting analysis) of steels
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