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GB/T 20564.12-2019

Chinese Standard: 'GB/T 20564.12-2019'
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BASIC DATA
Standard ID GB/T 20564.12-2019 (GB/T20564.12-2019)
Description (Translated English) Continuously cold rolled high strength steel sheet and strip forautomobile - Part 12: Dual phase steel with high formability
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H46
Classification of International Standard 77.140.50
Word Count Estimation 10,145
Date of Issue 2019-03-25
Date of Implementation 2020-02-01
Drafting Organization Shougang Group Co., Ltd., Metallurgical Industry Information Standards Institute, Angang Steel Co., Ltd., Beijing University of Science and Technology
Administrative Organization National Steel Standardization Technical Committee (SAC/TC 183)
Regulation (derived from) National Standard Announcement No. 3 of 2019
Proposing organization China Iron and Steel Association
Issuing agency(ies) State Administration of Markets and China National Standardization Administration

GB/T 20564.12-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Continuously cold rolled high strength steel sheet and
strip for automobile - Part 12: Dual phase steel with
high formability
汽车用高强度冷连轧钢板及钢带
第 12 部分: 增强成形性双相钢
ISSUED ON: MARCH 25, 2019
IMPLEMENTED ON: FEBRUARY 01, 2020
Issued by: State Administration for Market Regulation;
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 representation method ... 7
5 Ordering contents ... 7
6 Dimensions, shape, weight ... 8
7 Technical requirements ... 8
8 Test methods ... 10
9 Inspection rules ... 11
10 Packaging, marking and quality certificate ... 12
Annex A (informative) Chemical composition of steel ... 13
Annex B (informative) Approximation comparison of domestic and foreign
designations ... 14
Continuously cold rolled high strength steel sheet and
strip for automobile - Part 12: Dual phase steel with
high formability
1 Scope
This Part of GB/T 20564 specifies the terms and definitions, classification and
designation representation method, ordering contents, dimensions, shape,
weight, technical requirements, test methods, inspection rules, packaging,
marking and quality certificate of continuously cold rolled high strength steel
sheet and strip for automobile.
This Part applies to steel sheets and strips with a thickness of 0.50 mm ~ 3.00
mm, used for the manufacture of complex-forming automotive structural parts
and reinforcements (hereinafter referred to as “steel sheets and strips”).
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 223.4 Alloyed steel - Determination of manganese content -
Potentiometric or visual titration method
GB/T 223.9 Iron, steel and alloy - Determination of aluminium 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 223.12 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 223.17 Methods for chemical analysis of iron, steel and alloy - The
diantipyryl methane photometric method for the determination of titanium
content
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 & 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 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:
Infrared absorption method after combustion in an induction furnace (with
preheating)
GB/T 24174 Steel - Determination of Bake-Hardening-Index (BH2)
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
dual phase steel with high formability; DH
Steel of which the microstructure is mainly ferrite, martensite and a small
amount of retained austenite or bainite.
NOTE: Compared with dual phase steel of the same tensile strength, it has higher elongation
after fracture and work hardening index. It is suitable for part forming with high drawing
requirements.
b) reference to this Standard;
c) designation;
d) specifications and dimensions, flatness precision;
e) surface quality grade;
f) surface structure;
g) edge state;
h) packaging method;
i) weight;
j) use;
k) other special requirements.
5.2 If the dimensions and flatness precision, surface quality grade, surface
structure type, edge state and packaging information are not indicated in the
order contract, the supply party shall supply according to ordinary dimensions
and flatness precision, higher grade surface, pitted surface structure, edge-
trimmed state, and package according to the packaging method provided by
the supply party.
6 Dimensions, shape, weight
The dimensions, shape, weight and tolerance of steel sheets and strips shall
comply with the provisions of GB/T 708......
Related standard:   GB/T 20564.10-2017  GB/T 20564.11-2017
Related PDF sample:   GB/T 20564.11-2017
   
 
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