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GB/T 20887.7-2017 English PDF (GBT20887.7-2017)

GB/T 20887.7-2017 English PDF (GBT20887.7-2017)

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GB/T 20887.7-2017: Continuously hot rolled high strength steel sheet and strip for automobile -- Part 7: Steels for hydraulic forming

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.
GB/T 20887.7-2017
GB
NATIONAL STANDARD OF THE
PEOPLE 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 GB/T 223.40, Iron, steel and alloy ?€? Determination of niobium content by the 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
GB/T 223.79, Iron and steel ?€? Determination of multi-element contents ?€? X-ray 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
GB/T 709, Dimension, shape, weight and tolerances for hot rolled sheets and 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 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 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;
c) designation;
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.
5.2 If it is not stated in the purchase contract, including thickness accuracy, surface 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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