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Q/BQB 419-2014 English PDF (QBQB419-2014)

Q/BQB 419-2014 English PDF (QBQB419-2014)

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Q/BQB 419-2014: Cold-rolled ordinary high-strength steel plate and strip

The Technical Specifications specifies the terms and definitions, classification and codes, dimensions, shape, weight, technical requirements, inspection and testing, packaging, marking and inspection documents of cold-rolled ordinary high strength steel sheet and strip. The Technical Specifications apply to the cold-rolled ordinary high strength steel sheet and strip of 0.50 mm to 2.5 mm in thickness which are produced by BaoSteel Group.
Q/BQB 419-2014
Q/BQB
Technical Specifications
of BaoSteel Group
Replacing Q/BQB 411-2009, Q/BQB 412-2009,
Q/BQB 413-2009, Q/BQB 416-2009 and Q/BQB 419-2009
Cold-rolled Ordinary High Strength
Steel Sheet and Strip
ISSUED ON. OCTOBER 18, 2014
IMPLEMENTED ON. MARCH 31, 2015
Issued by. BaoSteel Group
Table of Contents
1 Scope ... 3
2 Normative References ... 3
3 Terms and Definitions ... 4
4 Classification and Codes ... 5
5 Order Information ... 6
6 Dimensions, Shape, Weight and Permissible Tolerances ... 7
7 Technical Requirements ... 7
8 Inspection and Testing ... 12
9 Packaging, Marking and Inspection Documents... 14
10 Rules for Rounding off Numerical Values ... 14
11 Equivalent Designations ... 14
Annex A (Informative) List of the Designations of the Technical
Specifications and the Designations of the Equivalent Domestic and Overseas Technical Specifications ... 15
Additional Information ... 16
Cold-rolled Ordinary High Strength
Steel Sheet and Strip
1 Scope
The Technical Specifications specifies the terms and definitions, classification and codes, dimensions, shape, weight, technical requirements, inspection and testing, packaging, marking and inspection documents of cold-rolled ordinary high strength steel sheet and strip. The Technical Specifications apply to the cold-rolled ordinary high strength steel sheet and strip of 0.50 mm to 2.5 mm in thickness (hereinafter referred to as steel sheet and strip) which are produced by BaoSteel Group.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition dated applies to this document. For undated references, the latest edition of the referenced document (including any amendments) applies to this Standard.
GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel
Products
GB/T 223 Methods for Chemical Analysis of Iron Steel and Alloy
GB/T 228.1-2010 Metallic Materials ?€? Tensile Testing ?€? Part 1. Method of Test at Room Temperature
GB/T 2523-2008 Measuring Method of Surface Roughness and Peak Count for Cold-Rolled Metal Sheet (Strip)
GB/T 2975-1998 Steel and Steel Products ?€? Location and Preparation of Test Pieces for Mechanical Testing
GB/T 4336-2002 Standard Test Method for Spark Discharge Atomic Emission Spectrometric Analysis of Carbon and Low-Alloy Steel (Routine Method)
GB/T 5027-2007 Metallic Materials ?€? Sheet and Strip ?€? Determination of Plastic Strain Ratio
GB/T 5028-2008 Metallic Materials ?€? Sheet and Strip ?€? Determination of Tensile Strain Hardening Exponent
GB/T 8170-2008 Rules of Rounding off for Numerical Values and Expression and Judgement Of Limiting Values
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)
GB/T 20125-2006 Low-alloy Steel ?€? Determination of Multi-Element Contents ?€? Inductively Coupled Plasma Atomic Emission Spectrometric Method
GB/T 20126-2006 Unalloyed Steel ?€? Determination of Low Carbon Content ?€? Part 2. Infrared Absorption Method after Combustion in an Induction Furnace (with Preheating)
GB/T 24174-2009 Steel ?€? Determination of Bake-Hardening-Index (BH2)
Q/BQB 400 Packaging, Marking and Inspection Documents of Cold-rolled
Products
Q/BQB 401 Dimensions, Shape, Weight and Permissible Tolerances of Cold- Rolled Steel Sheet and Strip
JIS Z2241.2011 Metallic Materials ?€? Tensile Testing ?€? Method of Test at Room Temperature
3 Terms and Definitions
3.1 Rephosphorized steels (P)
In low carbon steels or ultra-low carbon steels, the strength of steels is improved mainly by adding the solid solution strengthening elements, such as phosphorus, not exceeding 0.12%. This kind of steels show high strength and good cold-forming performance, and have good impact resistance and fatigue resistance performance, so it is usually used for the manufacture of automotive covering parts and structural parts.
3.2 Isotropic steels (I)
Isotropic steels are the steels which limit the plastic strain ratio (r value). Because of the isotropic performance of this kind of steels, they show good stretch forming performance, which is suitable for the manufacture of automotive covering parts. 3.3 High strength interstitial free steels (Y)
The plastic strain ratio (r value) and strain hardening exponent (n value) of steels are improved by controlling the chemical composition of steels. Because the microstructure of the solid solution strengthening and interstitial free atoms in the elements of steels, this kind of steels have high strength as well as very good cold- f) surface quality grade;
g) packaging method;
h) application; and
i) others.
5.2 If the dimensions and roughness accuracy, surface quality grade, edge state and packaging method are not indicated in the purchase contract, the products of the technical specifications will be delivered in accordance with the trimmed steel strip or trimmed steel sheet of common dimensions and roughness accuracy and FB grade surface quality; and shall be packaged in accordance with the packaging method provided by the supplier.
6 Dimensions, Shape, Weight and Permissible
Tolerances
The dimensions, shape, weight and permissible tolerances of steel sheet and strip shall meet the specifications of Q/BQB 401.
7 Technical Requirements
7.1 Chemical composition
7.1.1 The chemical composition of steels (by melting analysis) shall meet the specifications of Table 4.
7.1.2 The permissible tolerances of the chemical compositions of the finished products of steel sheet and strip shall meet the specifications of GB/T 222. 7.2 The steel used to produce steel sheet and strip are smelted with the oxygen converter.
7.3 Delivery condition
7.3.1 Steel sheet and strip shall be delivered after annealing and skin passing after cold rolling.
7.3.2 Steel sheet and strip is usually delivered with oil coating; the oil film coated can be removed with aqueous alkaline solutions. Under the normal conditions of packaging, transportation, handling and storage, the supplier shall guarantee that the surface of steel sheet and strip will not get rusty within 6 months from the date of manufacturing. In accordance with the requirements of the supplier and as agreed upon by both parties and indicated in the contract, it can also delivered without oil coating. For the product without oil coating, the supplier will not be held responsible for the defects resulted in the process of handling, storage and use, including rust, scratch and abrasion mark. Note. The issuing date of the product inspection documents is usually specified as the data of manufacture. 7.4 Mechanical properties
7.4.1 The supplier shall guarantee that the mechanical properties of steel sheet and strip will meet relevant specifications of Table 5, Table 6 and Table 7, within 6 months from the date of manufacture.
7.4.2 When steel sheet and strip is delivered in accordance with the specified parts, both parties can agree upon the mechanical properties meeting the processing requirements of the parts as the acceptance criteria. Then, mechanical properties specified in Table 5, Table 6 and Table 7 will no longer be the basis of delivery. 7.4.3 Because of the effects of ageing, the mechanical properties deteriorate with the passage of storage time, such as the rise of yield strength and tensile strength, the decrease of elongation after fracture, decline of forming performance and emergence of tensile strain marks. Users are advised to use the product as soon as possible. 9 Packaging, Marking and Inspection Documents
The packaging, marking and inspection documents of steel sheet and strip shall meet the specifications of Q/BQB 400. If the purchaser has some special requirements with respect to packaging, they shall be indicated in the contract.
10 Rules for Rounding off Numerical Values
The rules for rounding off numerical values shall meet the specifications of GB/T 8170. 11 Equivalent Designations
See Annex A for the designations of the Technical Specifications and the designations of the equivalent domestic and overseas technical specifications.

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