GB/T 20564.14-2023 English PDF (GBT20564.14-2023)

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GB/T 20564.14-2023: Continuously cold rolled high strength steel sheet and strip for automobile - Part 14: Low density steel
GB/T 20564.14-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
CCS H 46
Continuously Cold Rolled High Strength Steel Sheet
and Strip for Automobile – Part 14: Low Density Steel
ISSUED ON: AUGUST 6, 2023
IMPLEMENTED ON: MARCH 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 7
2 Normative References ... 7
3 Terms and Definitions ... 8
4 Designation Expression and Classification ... 8
5 Order Contents ... 9
6 Size, Shape and Weight ... 10
7 Technical Requirements ... 10
8 Test Method ... 12
9 Inspection Rules ... 13
10 Packaging, Marking and Quality Certificate ... 13
Appendix A (Informative) Reference Value on Chemical Composition (Smelting
Analysis) of Steel ... 14
Bibliography ... 15
Introduction
GB/T 20564 aims to standardize the designation expression and classification, ordering content,
size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking
and quality certificates of continuously cold-rolled high-strength steel sheet and strip for
automobile.
GB/T 20564 consists of 14 parts.
--- Part 1: Bake Hardening Steel. It aims to determine the technical requirements for
continuously cold-rolled bake-hardening high-strength steel sheets and strips with a
thickness of 0.50mm~3.00mm, which are mainly used to make outer panels, inner panels
and some structural parts of the automobile.
--- Part 2: Dual Phase Steel. It aims to determine the technical requirements for continuously
cold-rolled dual-phase high-strength steel sheets and strips with a thickness of
0.50mm~3.00mm, which are mainly used to make structural parts, reinforcements and
some internal and external panels of automobile.
--- Part 3: High Strength Interstitial Free Steel. It aims to determine the technical
requirements for continuously cold-rolled high-strength interstitial-free steel sheets and
strips with a thickness of 0.50mm~3.00mm, which are mainly used to make outer panels,
inner panels and some structural parts of the automobile.
--- Part 4: High Strength Low Alloy Steel. It aims to determine the technical requirements
for continuously cold-rolled low-alloy high-strength steel sheets and strips with a
thickness of no more than 3.0mm, which are mainly used to make structural parts and
reinforcements of the automobile.
--- Part 5: Isotropic Steel. It aims to determine the technical requirements for continuously
cold-rolled isotropic high-strength steel sheets and strips with a thickness of no more
than 2.5mm, which are mainly used to make outer panels of the automobile.
--- Part 6: Transformation Induced Plasticity Steel. It aims to determine the technical
requirements for continuously cold rolled transformation induced plasticity high-strength
steel sheets and strips with a thickness of 0.50mm~2.5mm, which are mainly used to
make structural parts and reinforcements of the automobile.
--- Part 7: Martensitic Steel. It aims to determine the technical requirements for continuously
cold-rolled martensitic high-strength steel sheets and strips with a thickness of
0.50mm~2.1mm, which are mainly used to make structural parts, reinforcements and
anti-collision parts of the automobile.
--- Part 8: Complex Phase Steel. It aims to determine the technical requirements for
continuously cold-rolled complex phase high-strength steel sheets and strips with a
Continuously Cold Rolled High Strength Steel Sheet
and Strip for Automobile – Part 14: Low Density Steel
1 Scope
This Document specifies the designation expression and classification, ordering content, size,
shape, weight, technical requirements, test methods, inspection rules, packaging, marking and
quality certificates of continuously cold-rolled low-density high-strength steel sheets and strips
for automobiles.
This Document applies to continuously cold-rolled low-density high-strength steel sheets and
strips (hereinafter referred to as "steel sheets and strips") with a thickness of 0.6mm~3.0mm,
which are mainly used to make structural parts and reinforcement parts of the automobile.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 223.4 Alloyed steel - Determination of manganese content - Potentiometric or visual
titration method
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 - Chrom azurol S
photometric method
GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the
Sulphochlorophenol S Spectrophotometric Method
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 223.76 Methods for chemical analysis of iron, steel and alloy The flame atomic
absorption spectrometric method for the determination of vanadium content
GB/T 223.84 Steel and iron - Determination of titanium content - Diantipyrylmethane
spectrophotometric 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 228.1-2021 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 708 Dimension, shape, weight and tolerance for cold-rolled steel strip and sheet
GB/T 2523 Measuring method of surface roughness, peak count and waviness for cold-
rolled metal sheet and strip
GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for
Mechanical Testing
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
3 Terms and Definitions
For the purposes of this Document, the following terms and definitions apply.
3.1 Low density steel
A high strength steel that, through adding different contents of lightweight elements such as Al,
Mn, and Si to steel, obtains excellent mechanical properties and a density reduction amplitude
of no less than 4%.
4 Designation Expression and Classification
4.1 Designation expression
The designations of steel sheets and strips are composed of three parts, such as the initials "CR"
c) Designation;
d) Specification, dimension, and unevenness accuracy;
e) Surface quality level;
f) Surface structure;
g) Edge state;
h) Packaging method;
i) Weight;
j) Purpose;
k) Other special requirements.
5.2 If the size and unevenness accuracy, surface quality level, surface structure type, edge
condition, packaging and other informa...