GB/T 20564.8-2015 PDF English
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Continuously Cold Rolled High Strength Steel Sheet and Strip for Automobile - Part 8: Complex Phase Steel
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GB/T 20564.8-2015: Continuously Cold Rolled High Strength Steel Sheet and Strip for Automobile - Part 8: Complex Phase Steel
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20564.8-2015
GB
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 8. Complex Phase Steel
Issued on: DECEMBER 10, 2015
Implemented on: NOVEMBER 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 6
4 Classification and Code ... 6
5 Ordering Required Information ... 7
6 Dimension, Appearance, Weight and Allowable Tolerance ... 8
7 Technical Requirements ... 8
8 Inspection and Test ... 10
9 Package, Label and Quality Certificate ... 10
10 Rounding off of Numeric Values ... 11
11 Domestic and Foreign Designations’ Approximate Comparison ... 11
Foreword
GB/T 20564 Continuously Cold Rolled High Strength Steel Sheet and Strip for
Automobile is divided into 8 parts.
--- Part 1. Bake Hardening Steel;
--- Part 2. Duplex Steel;
--- Part 3. Interstitial-Free Steel;
--- Part 4. Low-Alloy High-Strength Steel;
--- Part 5. Isotropic steel;
--- Part 6. Transformation Induced Plasticity Steel;
--- Part 7. Martensitic steel;
--- Part 8. Complex Phase Steel.
This Part is Part 8 of GB/T 20564.
This Part was drafted as per the rules stated 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 for
Standardization of Steel (SAC/TC 183).
Drafting organizations of this Part. Shougang Company Limited, and China Metallurgical
Information and Standardization Institute.
Chief drafting staffs of this Part. Tang Mu, Kuang Shuang, Zhang Weixu, Shi Li, and
Yao Shun.
Continuously Cold Rolled High Strength Steel Sheet
and Strip for Automobile - Part 8. Complex Phase Steel
1 Scope
This Part of GB/T 20564 specifies the terms and conditions, classification and code,
dimension, appearance, weight, technical requirement, inspection and test, package,
label and quality certificate, and etc. of continuously cold rolled high strength steel
sheet and strip (hereinafter referred to as steel sheet and strip).
This Part specified steel sheet and steel strip are mainly used for manufacturing
automotive construction parts, strengthening parts, and partial internal and external
plates; the thickness of steel sheet and steel strip is 0.60mm~2.50mm.
2 Normative References
The following documents are essential to the application of 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) are applicable to this standard.
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 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual
Titration or Potentiometric Titration Method
GB/T 223.23 Iron, Steel and Alloy - Determination of Nickel Content -
Dimethylglyoxime Spectrophotometric Method
GB/T 223.26 Iron, Steel and Alloy - Determination of Moybdenum Content - The
Thiocyanate Spectrophotometric Method
GB/T 223.53 Method for Chemical Analysis of Iron, Steel and Alloy - The Flame
Atomic Absorption Spectrophotometric Method for the Determination of Copper
Content
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 223.60 Methods for Chemical Analysis of Iron, Steel and Alloy - the
Perchloric Acid Dehydration Gravimetric Method for the Determination of Silicon
Content
GB/T 223.63 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium
(Potassium) Periodate Photometric Method for the Determination of Manganese
Content
GB/T 223.64 Iron, Steel and Alloy - Determination of Manganese Content - Flame
Atomic Absorption Spectrometric Method
GB/T 223.67 Iron, Steel and Alloy - Determination of Sulfur Content - Methylene
Blue Spectrophotometric Method
GB/T 223.68 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Potassium Iodate Titration Method after Combustion in the Pipe Furnace for the
Determination of Sulfur Content
GB/T 223.69 Iron, Steel and Alloy-Determination of Carbon Contents -
Gas-volumetric Method after Combustion in the Pipe Furnace
GB/T 223.71 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Gravimetric Method after Combustion in the Pipe Furnace for the Determination of
Carbon Content
GB/T 223.72 Iron, Steel and Alloy - Determination of Sulfur Content - Gravimetric
Method
GB/T 228.1-2010 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 Plates
and Sheets
GB/T 2523 Measuring Method of Surface Roughness and Peak Count for
Cold-Rolled Metal Sheet (Strip)
GB/T 2975 Steel and Steel Products - Location and Preparation of 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 8170 Rules of Rounding off for Numerical Values & Expression and
Judgment 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
The following terms and definitions are applicable to this document.
3.1 Complex phase steel, CP
Steel’s microstructure indicates ferrite or Bainite matrix distributed with small amount
of Martensite, retained austenite or pearlite. Through micro-alloying element, conduct
fine grain strengthening or precipitation strengthening, Compared with the duplex
steel with the same tensile strength, it has higher yield strength and better bending
performance.
4 Classification and Code
4.1 Designation naming method
The designation of steel sheet and steel strip consists of the initial letters of Cold
Rolled - “CR”; specified minimum yield strength/ tensile strength; and initial letters of
Complex Phase - “CP”. E.g.. CR500/780CP.
4.2 Classification for surface quality
6 Dimension, Appearance, Weight and Allowable
Tolerance
The dimension, appearance, weight and allowable tolerance of steel sheet and steel
strip shall conform to the provisions of GB/T 708.
7 Technical Requirements
7.1 Chemical composition
Steel’s chemical composition (melting analysis) reference can refer to Appendix A. If
the buyer has any requirements for the chemical composition, it shall be coordinated
during the ordering period.
7.2 Melting method
Steel sheet and steel strip used steel is melted in oxygen converter or electric furnace;
unless otherwise is specified, the melting mode shall be selected by the supplier.
7.3 Delivery state
7.3.1 Steel sheet and steel strip shall be delivered in the flat state after annealing.
7.3.2 Generally, steel sheet and steel strip shall be delivered in coating mode; the
coating film can be removed by the alkali solution or ordinary solution; under the
common packing, transporting, loading and unloading, and storing conditions,
supplier shall guarantee, within 6 months since the date of manufacture, the surface
of steel sheet and steel strip generates no rust. If the buyer demands the product shall
be delivered without coating, then it shall be coordinated in the ordering period.
NOTE. As for the product that the buyer demands no coating, it may generate rust, or its
surface may be slightly scratched during the transporting, loading and unloading, storing and
using period.
7.4 Mechanical properties
Mechanical properties of steel sheet and steel strip shall conform to the provisions of
Table 3.
10 Rounding off of Numeric Values
This Part conducts rounding by rounding value comparison method; the rounding
rules shall conform to the provisions of GB/T 8170.
11 Domestic and Foreign Designations’ Approximate
Comparison
The designations’ approximate comparison in this Part and foreign standard can refer
to Appendix B.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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