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GB/T 20887.6-2017 English PDF (GBT20887.6-2017)

GB/T 20887.6-2017 English PDF (GBT20887.6-2017)

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GB/T 20887.6-2017: Continuously hot rolled high strength steel sheet and strip for automobile -- Part 6: Complex phase steel

This Part of GB/T 20887 specifies the classification and designation representing method, ordering content, dimensions, shape, weight, technical requirements, test methods, inspection rules, package, mark, and quality certificate of hot rolled high strength complex phase steel sheet and strip. This Part applies to the steel strip with a thickness of no more than 8 mm and steel plate cut transversely from steel strip and longitudinally-cut steel strip for the production of automobile structural parts and reinforcements.
GB/T 20887.6-2017
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.50
H 46
Continuously hot rolled high strength steel sheet and
strip for automobile - Part 6. Complex phase steel
ISSUED ON. SEPTEMBER 7, 2017
IMPLEMENTED ON. JUNE 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 6
4 Classification and designation representing method ... 6
5 Ordering content ... 7
6 Dimensions, shape, weight ... 8
7 Technical requirements ... 8
8 Test methods ... 10
9 Inspection rules ... 11
10 Package, mark, and quality certificate ... 11
Appendix A (Informative) Reference values for chemical composition ... 12 Appendix B (Informative) Approximate comparison between designations in domestic and in foreign standards ... 13
Continuously hot rolled high strength steel sheet and
strip for automobile - Part 6. Complex phase steel
1 Scope
This Part of GB/T 20887 specifies the classification and designation
representing method, ordering content, dimensions, shape, weight, technical requirements, test methods, inspection rules, package, mark, and quality certificate of hot rolled high strength complex phase steel sheet and strip. This Part applies to the steel strip with a thickness of no more than 8 mm and steel plate cut transversely from steel strip and longitudinally-cut steel strip (hereafter known as ?€?steel plate and strip?€? for short) for the production of automobile structural parts and reinforcements.
2 Normative references
The following documents are indispensable for the application of this document. For the dated references, only the versions with the dates indicated are applicable to this document. For the undated references, 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 223.5 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 -
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 223.17 Methods for Chemical Analysis of Iron Steel and Alloy - The Diantipyrylmethane Photometric Method for the Determination of Titanium Content
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 223.58 Methods for chemical analysis of iron, steel and alloy - The sodium arsenite-sodium nitrite titrimetric method for the determination of manganese 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 223.68 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 223.75 Iron, steel and alloy - Determination of boron content - Methanol distillation-curcumin photometric method
GB/T 223.76 Methods for chemical analysis iron, steel and alloy - The flame atomic absorption spectrometric method for the determination of vanadium content
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 709 Dimensions, Shape, Weight and Tolerances for Hot Rolled Steel
Sheets and Strips
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 6394 Metal - Methods for estimating the average grain size
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 10561 Steel - Determination of Content of Nonmetallic Inclusions - Micrographic Method Using Standards Diagrams
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 24524 Metallic materials - Sheet and strip - Hole expanding test
3 Terms and definitions
The following terms and definitions are applicable to this document.
3.1 Complex phase steel; CP
The microstructure of the steel is a small amount of martensite, retained austenite, or pearlite distributed on the ferrite or bainite matrix. Fine-grain strengthening or precipitation strengthening by microalloying elements. Compared with dual phase steels with the same tensile strength, it has higher yield strength and certain flanging hole expanding property.
4 Classification and designation representing method
4.1 Classification
4.1.1 The steel sheet and strip can be classified into hot-rolled surface and hot- rolled pickling surface as per the surface states. When the surface state is hot- rolled pickling surface, it shall be denoted by Code ?€?P?€?.
products shall be supplied as per hot rolled surface, ordinary thickness accuracy, ordinary surface (FA), edge-cutting state, and oil-coated. For hot- rolled pickling surface, if the surface quality level and oil use are not specified, the products shall be supplied as per relative-high surface (FA) [should be. FB] and oil-coated.
6 Dimensions, shape, weight
The dimensions, shape, weight, and permissible tolerances of steel sheet and strip shall comply with the provisions of GB/T 709.
7 Technical requirements
7.1 Chemical composition
7.1.1 Reference values for chemical composition (melting analysis) of steel are given in Appendix A. If the demand side has a requirement for chemical
composition, it shall be negotiated when ordering. Approximate comparison between designations in domestic and foreign standards is shown in Appendix B.
7.1.2 The permissible tolerances for chemical composition of steel products shall comply with the provisions of GB/T 222.
7.2 Smelting method
The steel used for steel sheet and strip is smelted using an oxygen converter or an electric furnace. Unless otherwise specified, the smelting method shall be selected by the supplier.
7.3 Delivery state
7.3.1 Steel sheet and strip are usually delivered in hot rolled state.
7.3.2 When the steel plate and strip have a hot-rolled pickling surface, they are usually supplied oiled. The oil film coated shall be able to be removed with aqueous alkali. Under normal package, transport, loading-unloading, and storage conditions, the supplier shall ensure that, within 3 months from the date of completion of manufacture, the surface of steel sheet and strip does not rust. If negotiated by both sides of the supply and demand and indicated in the contract, hot-rolled pickling surface may be supplied without oil-coated. Note. For non-oiled products required by the demand side, there may be corrosion; and during transport, loading-uploading, storage, and use, the surface may be slightly 6 Dimensions, shape
Piece by
piece/roll by roll -
Suitable measuring
tool
7 Surface quality Piece by piece/roll by roll - Visual
9 Inspection rules
9.1 The inspection and acceptance of steel sheet and strip shall be performed by the supplier?€?s inspection department.
9.2 The steel sheet and strip shall be accepted in batches. Each batch shall consist of steel sheets and strips of the same designation, the same furnace number, the same thickness, and the same rolling mechanism with a weight of no more than 60 t. For the steel strip and continuously rolled sheet with roll weight greater than 30 t, each two rolls shall be regarded as one batch. 9.3 The sampling quantity and sampling methods for steel sheet and strip shall conform to the provisions of Table 3.
9.4 The re-inspection and judgement rules of steel sheet and strip shall conform to the provisions of GB/T 17505.
9.5 The test results of chemical composition and mechanical properties shall be rounded off according to the rounding off value comparison method. The rounding off rules shall be in accordance with the provisions of GB/T 8170. 10 Package, mark, and quality certificate
The package, mark, and quality certificate of steel sheet and strip shall conform to the provisions of GB/T 247. If the demand side has a special requirement for the package, it can be negotiated when ordering.

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