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GB/T 20564.12-2019 PDF in English


GB/T 20564.12-2019 (GB/T20564.12-2019, GBT 20564.12-2019, GBT20564.12-2019)
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GB/T 20564.12-2019English135 Add to Cart 0-9 seconds. Auto-delivery. Continuously cold rolled high strength steel sheet and strip for automobile -- Part 12: Dual phase steel with high formability Valid


Standards related to: GB/T 20564.12-2019

GB/T 20564.12-2019: PDF in English (GBT 20564.12-2019)

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
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.
7 Technical requirements
7.1 Chemical composition
See Annex A for reference values for chemical composition (melting analysis)
of steel. If the manufacturer has requirements for chemical composition, they
shall be negotiated at the time of ordering. See Annex B for an approximation
comparison of designations in domestic and foreign standards.
7.2 Smelting method
The steel used for steel sheets and strips is smelted in an oxygen converter or
an electric furnace. Unless otherwise specified, the smelting method is selected
by the supply party.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.