GB/T 20564.9-2016Continuously cold-rolled high strength steel sheet and strip for automobiles - Part 9: Quenching and partitioning steel (English PDF)
汽车用高强度冷连轧钢板及钢带 第9部分：淬火配分钢
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Issued by
General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC
Level / Type
National · Recommended
Issue date
October 13, 2016
Implementation date
September 1, 2017
Scope
GB/T 20564.9-2016 is the English-translated version of 汽车用高强度冷连轧钢板及钢带 第9部分：淬火配分钢.
GB/T 20564.9-2016 is the Chinese standard "Continuously cold-rolled high strength steel sheet and strip for automobiles - Part 9: Quenching and partitioning steel".
Its scope clause reads: This Part of GB/T 20564 specifies the terms and definitions, classification and code, ordering content, dimension, shape, weight, technical requirements, test method, inspection rules, package, marking and quality certificate of cold rolled quenching and partitioning high strength steel sheet and strip (hereinafter referred to as steel sheet and strip).
This Part is applicable to the steel sheet and strip with thickness of 0.8mm ~ 2.5mm for manufacturing automotive structural parts and reinforcement parts. Its clauses include terms and definitions; classification and code.
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Document preview — GB/T 20564.9-2016
National Standard of the People's Republic of China
- ICS
- 77.140.50
- Classification
- H 46
Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope4
- 2 Normative References4
- 3 Terms and Definitions6
- 4 Classification and Code6
- 5 Ordering Contents7
- 6 Dimension, Shape and Weight8
- 7 Technical Requirements8
- 8 Test Methods10
- 9 Inspection Rules10
- 10 Package, Marking and Quality Certificate11
- Appendix A (Informative) Reference Value of Chemical Compositions12
1 Scope
This Part of GB/T 20564 specifies the terms and definitions, classification and code, ordering content, dimension, shape, weight, technical requirements, test method, inspection rules, package, marking and quality certificate of cold rolled quenching and partitioning high strength steel sheet and strip (hereinafter referred to as steel sheet and strip).
This Part is applicable to the steel sheet and strip with thickness of 0.8mm ~ 2.5mm for manufacturing automotive structural parts and reinforcement parts.
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 document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.4 Iron, Steel and Alloy - Determination of Manganese Content -
Potentiometric or Visual Titration Method
GB/T 223.8 Methods for Chemical Analysis of Iron, Steel and Alloy – The Sodium
Fluoride Separation – EDTA Volumetric Method for the Determination of Aluminum
Content
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 223.23 Iron, Steel and Alloy - Determination of Nickel Content - The
Dimethylglyoxime Spectrophotometric Method
GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The
Thiocyanate Spectrophotometric Method
GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the
Sulphochlorophenol S Spectrophotometric Method
GB/T 223.53 Methods 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 pf Iron, Steel ad 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 223.67 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 228.1-2010 Metallic Materials - Tensile Testing - Part 1. Method of Test at
Room Temperature
GB/T 247 General Rule of Acceptance, Package, Mark and Certification for Steel
Sheet and Strip
GB/T 708 Dimension, Shape, Weight, and Tolerance for Cold-Rolled Steel Plate
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
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
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Quenching and partitioning steel
QP The microstructure of steel is martensite, retained austenite and ferrite. During the forming process, the remained austenite can perform phase-transformation into martensite; and have higher work hardening rate, uniform elongation and tensile strength. Compared with the dual phase steel with the equivalent tensile strength, it has higher elongation; compared with the phase-transformation-induced plastic steel with equivalent tensile strength, it has lower carbon equivalent.
4 Classification and Code
4.1
The grade of steel sheet and strip consists of three parts, namely, initials “CR” of
“Cold Rolled”, specified minimum yield strength value/specified minimum tensile strength value, and initials “QP” of “Quenching and Partitioning”.
Example. CR550/980QP
CR – initials of “Cold Rolled”;
550/980 – 550. specified minimum yield strength value, in MPa; 980. specified minimum tensile strength value, in MPa;
QP – Initials of “Quenching and Partitioning”. […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 222Steels and alloys - Permissible deviations of product analyzed chemical composition
- GB/T 223.4Alloyed steel - Determination of manganese content - Potentiometric or visual titration method
- GB/T 223.8Iron, steel and alloy — Determination of aluminium content — Titrimetric method and spectrophotometric method
- GB/T 223.9Iron, steel and alloy -- Determination of aluminium content -- Chrome azurol S photometric method
- GB/T 223.11Iron, steel and alloy - Determination of chromium content - Titrimetric method and spectrophotometric method
- GB/T 223.23Iron, steel and alloy—Determination of nickel content—Spectrophotometric method and gravimetric method
GB/T 223.53
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Related Standards
GB/T 17505-2016 — Steel and steel products -- General technical delivery requirements
GB/T 20066-2006 — Steel and iron -- Sampling and preparation of samples for the determination of chemical composition
GB/T 20123-2006 — Steel and iron -- Determination of total carbon and sulfur content Infrared absorption method after combustion in an induction furnace (routine method)
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