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

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

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 and quot;steel sheets and strips and quot;) with a thickness of 0.6mm~3.0mm, which are mainly used to make structural parts and reinforcement parts of the automobile.
GB/T 20564.14-2023
GB
NATIONAL STANDARD OF THE
PEOPLE 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 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 information are not specified in the order contract, the products in this Document shall be supplied as per the cutting-edge steel sheets and strips based on ordinary size and unevenness accuracy, higher surface, and pitting surface structure. They are packaged according to the packaging method provided by the supplier.
6 Size, Shape and Weight
The size, 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 Appendix A for reference values of chemical composition (smelting analysis) of steel. If there are other special requirements for chemical composition, they shall be negotiated when ordering.
7.2 Smelting method
The steel used for steel sheets and strips shall be smelted by oxygen converters or electric furnaces. Unless otherwise specified, the smelting method is chosen by the supplier. 7.3 Delivery status
7.3.1 Steel sheets and strips are delivered in a flat state after annealing. 9 Inspection Rules
9.1 The inspection and acceptance of steel sheets and strips shall be carried out by the supplier?€?s inspection department.
9.2 Steel sheets and strips shall be accepted by batch. Each inspection batch shall be composed of steel sheets and strips of the same brand, specifications, and processing status. The weight of each batch shall not exceed 30t. For steel strips with a coil weight greater than 30t, each coil shall be regarded as an inspection batch.
9.3 The sampling quantities and sampling methods of steel sheets and strips shall comply with the provisions of Table 7.
9.4 The re-inspection and judgment rules for steel sheets and strips shall comply with the provisions of GB/T 17505.
9.5 The test results of chemical composition and mechanical properties are rounded off according to the rounding value comparison method, and the rounding rules are implemented in accordance with the provisions of GB/T 8170.
10 Packaging, Marking and Quality Certificate
If there are no special requirements, the packaging, marking and quality certificate of steel sheets and strips shall comply with the provisions of GB/T 247.

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