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汽车用高强度热连轧钢板及钢带 第6部分：复相钢
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GBT 20887.6-2017
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标准编号: GB/T 20887.6-2017 (GB/T20887.6-2017)
中文名称: 汽车用高强度热连轧钢板及钢带 第6部分：复相钢
英文名称: Continuously hot rolled high strength steel sheet and strip for automobile -- Part 6: Complex phase steel
行业: 国家标准 (推荐)
中标分类: H46
字数估计: 9,976
发布日期: 2017-09-07
实施日期: 2018-06-01
起草单位: 首钢总公司、冶金工业信息标准研究院、鞍钢股份有限公司
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 20887.6-2017: 汽车用高强度热连轧钢板及钢带 第6部分：复相钢
GB/T 20887.6-2017 英文名称: Continuously hot rolled high strength steel sheet and strip for automobile -- Part 6: Complex phase steel
1 范围
GB/T 20887的本部分规定了热轧复相高强度钢板及钢带的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。
本部分适用于制作汽车结构件、加强件用厚度不大于8mm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 223.11 钢铁及合金 铬含量的测定 可视滴定或电位滴定法
GB/T 223.17 钢铁及合金化学分析方法 二安替比林甲烷光度法测定钛量
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 223.40 钢铁及合金化学分析方法 离子交换分离-氯磺酚S光度法测定铌量
GB/T 223.58 钢铁及合金化学分析方法 亚砷酸钠-亚硝酸钠滴定法测定锰量
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 223.60 钢铁及合金化学分析方法 高氯酸脱水重量法测定硅含量
GB/T 223.68 钢铁及合金化学分析方法 管式炉内燃烧后碘酸钾滴定法测定硫含量
GB/T 223.69 钢铁及合金 碳含量的测定 管式炉内燃烧后气体容量法
GB/T 223.75 钢铁及合金 硼含量的测定 甲醇蒸馏-姜黄素光度法
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 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 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 6394 金属平均晶粒度测定法
GB/T 8170 数值修约规则与极限数值的表示和判定
GB/T 10561 钢中非金属夹杂物含量的测定 标准评级图显微检验法
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 24524 金属材料 薄板和薄带 扩孔试验方法
3 术语和定义
下列术语和定义适用于本文件。
3.1
复相钢
钢的显微组织是铁素体或贝氏体基体上分布少量马氏体、残余奥氏体或珠光体。通过微合金元素细晶强化或析出强化。与同等抗拉强度的双相钢相比,具有较高的屈服强度和一定的翻边扩孔性能。
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”、规定的最小屈服强度值/规定的最小抗
拉强度值、复相英文“ComplexPhase”首字母“CP”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) 包装方式;
i) 重量;
j) 用途。
5.2 如订货合同中未注明表面状态、厚度精度、表面质量级别、边缘状态及是否涂油等信息时,则以热轧表面、普通厚度精度、普通级表面(FA)、切边状态和涂油供货。对于表面状态为热轧酸洗表面时,如未说明表面质量级别和是否涂油时,以较高级表面(FA)和涂油交货。
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 化学成分
7.1.1 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。国内外标准牌号近似对照参见附录B。
7.1.2 钢的成品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或电炉冶炼,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1的规定。
7.5 表面质量
7.5.1 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。
7.5.2 钢板及钢带各表面质量应符合表2的规定。
7.6 特殊要求
根据需方要求,经供需双方协商,并在合同中注明,可补充扩孔率、晶粒度和非金属夹杂物检验。
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 223.11、GB/T 223.17、GB/T 223.26、GB/T 223.40、GB/T 223.58、GB/T 223.59、GB/T 223.60、GB/T 223.68、GB/T 223.69、GB/T 223.75、GB/T 223.76、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 223.11、GB/T 223.17、GB/T 223.26、GB/T 223.40、GB/T 223.58、GB/T 223.59、GB/T 223.60、GB/T 223.68、GB/T 223.69、GB/T 223.75、GB/T 223.76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3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3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的规定。如需方对包装有特殊要求,可在
订货时协商。
GB/T 20887.6-2017
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 6. Complex phase steel
ISSUED ON. SEPTEMBER 7, 2017
IMPLEMENTED ON. JUNE 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 6
4 Classification and designation representing method ... 6
5 Ordering content ... 7
6 Dimensions, shape, weight ... 8
7 Technical requirements ... 8
8 Test methods ... 10
9 Inspection rules ... 11
10 Package, mark, and quality certificate ... 11
Appendix A (Informative) Reference values for chemical composition ... 12
Appendix B (Informative) Approximate comparison between designations in
domestic and in foreign standards ... 13
Continuously hot rolled high strength steel sheet and
strip for automobile - Part 6. Complex phase steel
1 Scope
This Part of GB/T 20887 specifies the classification and designation
representing method, ordering content, dimensions, shape, weight, technical
requirements, test methods, inspection rules, package, mark, and quality
certificate of hot rolled high strength complex phase steel sheet and strip.
This Part applies to the steel strip with a thickness of no more than 8 mm and
steel plate cut transversely from steel strip and longitudinally-cut steel strip
(hereafter known as “steel plate and strip” for short) for the production of
automobile structural parts and reinforcements.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the versions with the dates indicated are
applicable to this document. For the undated references, the latest version
(including all the amendments) are applicable 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 Aluminum Content -
Chrome Azurol S Photometric Method
GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content -
Visual Titration or Potentiometric Titration Method
GB/T 223.17 Methods for Chemical Analysis of Iron Steel and Alloy - The
Diantipyrylmethane Photometric Method for the Determination of Titanium
Content
GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content -
The Thiocyanate Spectrophotometric Method
GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the
Sulphochlorophenol S Spectrophotometric Method
GB/T 223.58 Methods for chemical analysis of iron, steel and alloy - The
sodium arsenite-sodium nitrite titrimetric method for the determination of
manganese content
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 223.60 Methods for chemical analysis of iron, steel and alloy - The
perchloric acid dehydration gravimetric method for the determination of
silicon content
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The
potassium iodate titration method after combustion in the pipe furnace for
GB/T 223.69 Iron, steel and alloy - Determination of carbon contents - Gas-
volumetric method after combustion in the pipe furnace
GB/T 223.75 Iron, steel and alloy - Determination of boron content - Methanol
distillation-curcumin photometric method
GB/T 223.76 Methods for chemical analysis iron, steel and alloy - The flame
atomic absorption spectrometric method for the determination of vanadium
content
GB/T 228.1-2010 Metallic materials - Tensile testing - Part 1. Method of test
at room temperature
(sheets) and strips
GB/T 709 Dimensions, Shape, Weight and Tolerances for Hot Rolled Steel
Sheets and Strips
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 6394 Metal - Methods for estimating the average grain size
judgement of limiting values
GB/T 10561 Steel - Determination of Content of Nonmetallic Inclusions -
Micrographic Method Using Standards Diagrams
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
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)
GB/T 24524 Metallic materials - Sheet and strip - Hole expanding test
3 Terms and definitions
The following terms and definitions are applicable to this document.
3.1 Complex phase steel; CP
austenite, or pearlite distributed on the ferrite or bainite matrix. Fine-grain
strengthening or precipitation strengthening by microalloying elements.
Compared with dual phase steels with the same tensile strength, it has higher
yield strength and certain flanging hole expanding property.
4 Classification and designation representing method
4.1 Classification
4.1.1 The steel sheet and strip can be classified into hot-rolled surface and hot-
rolled pickling surface as per the surface states. When the surface state is hot-
rolled pickling surface, it shall be denoted by Code “P”.
accuracy, ordinary surface (FA), edge-cutting state, and oil-coated. For hot-
rolled pickling surface, if the surface quality level and oil use are not specified,
the products shall be supplied as per relative-high surface (FA) [should be. FB]
and oil-coated.
6 Dimensions, shape, weight
The dimensions, shape, weight, and permissible tolerances of steel sheet and
strip shall comply with the provisions of GB/T 709.
7 Technical requirements
7.1 Chemical composition
given in Appendix A. If the demand side has a requirement for chemical
composition, it shall be negotiated when ordering. Approximate comparison
between designations in domestic and foreign standards is shown in Appendix
B.
7.1.2 The permissible tolerances for chemical composition of steel products
shall comply with the provisions of GB/T 222.
7.2 Smelting method
The steel used for steel sheet and strip is smelted using an oxygen converter
or an electric furnace. Unless otherwise specified, the smelting method shall be
7.3 Delivery state
7.3.1 Steel sheet and strip are usually delivered in hot rolled state.
7.3.2 When the steel plate and strip have a hot-rolled pickling surface, they are
usually supplied oiled. The oil film coated shall be able to be removed with
aqueous alkali. Under normal package, transport, loading-unloading, and
storage conditions, the supplier shall ensure that, within 3 months from the date
of completion of manufacture, the surface of steel sheet and strip does not rust.
If negotiated by both sides of the supply and demand and indicated in the
contract, hot-rolled pickling surface may be supplied without oil-coated.
during transport, loading-uploading, storage, and use, the surface may be slightly
6 Dimensions, shape
Piece by
piece/roll by roll -
Suitable measuring
tool
7 Surface quality Piece by piece/roll by roll - Visual
9 Inspection rules
9.1 The inspection and acceptance of steel sheet and strip shall be performed
9.2 The steel sheet and strip shall be accepted in batches. Each batch shall
consist of steel sheets and strips of the same designation, the same furnace
number, the same thickness, and the same rolling mechanism with a weight of
no more than 60 t. For the steel strip and continuously rolled sheet with roll
weight greater than 30 t, each two rolls shall be regarded as one batch.
9.3 The sampling quantity and sampling methods for steel sheet and strip shall
conform to the provisions of Table 3.
9.4 The re-inspection and judgement rules of steel sheet and strip shall conform
to the provisions of GB/T 17505.
be rounded off according to the rounding off value comparison method. The
rounding off rules shall be in accordance with the provisions of GB/T 8170.
10 Package, mark, and quality certificate
The package, mark, and quality certificate of steel sheet and strip shall conform
to the provisions of GB/T 247. If the demand side has a special requirement for
the package, it can be negotiated when ordering.
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