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GB/T 5213-2019 English PDF (GBT5213-2019)

GB/T 5213-2019 English PDF (GBT5213-2019)

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GB/T 5213-2019: Cold rolled low carbon steel sheet and strip

This Standard specifies the terms and definitions, classification and designation, ordering content, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certification of cold rolled low carbon steel plates (sheets) and strips. This Standard applies to cold rolled low carbon steel plates (sheets) and strips with a thickness not greater than 3.5 mm which are used for cold forming.
GB/T 5213-2019
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 5213-2008
Cold rolled low carbon steel sheet and strip
ISSUED ON: MARCH 25, 2019
IMPLEMENTED ON: FEBRUARY 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Classification and designation ... 5
4 Ordering content ... 7
5 Dimensions, shape and weight ... 7
6 Technical requirements ... 7
7 Test methods ... 10
8 Inspection rules ... 11
9 Packaging, marking and quality certification ... 11
Annex A (Informative) Chemical components of steel ... 12
Annex B (Informative) Cross-reference of similar domestic and foreign
designations ... 13
Cold rolled low carbon steel sheet and strip
1 Scope
This Standard specifies the terms and definitions, classification and designation, ordering content, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certification of cold rolled low carbon steel plates (sheets) and strips.
This Standard applies to cold rolled low carbon steel plates (sheets) and strips with a thickness not greater than 3.5 mm which are used for cold forming (hereinafter referred to as ?€?steel plates (sheets) and strips?€?).
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 documents (including all amendments) applies to this document.
GB/T 223.9, Iron steel and alloy ?€? Determination of aluminium content ?€? Chrome azurol S photometric method
GB/T 223.16, Methods for chemical analysis of iron, steel and alloy ?€? The chromotropic acid photometric method for the determination of titanium content GB/T 223.40, Methods for chemical analysis of iron, steel and alloy ?€? The anion- exchange separation-sulphochlorophenol S photometric method for the
determination of niobium 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 223.63, Methods for chemical analysis of iron, steel and alloy ?€? The sodium (potassium) periodate photometric method for the determination of manganese 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 708, Dimensions, shape, weight and tolerances for cold-rolled steel plates (sheets) and strips
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 samples and 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 5027, Metallic materials ?€? Sheet and strip ?€? Determination of plastic strain ratio
GB/T 5028, Metallic materials ?€? Sheet and strip ?€? Determination of tensile strain hardening exponent
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
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)
3 Classification and designation
3.1 Classification
3.1.1 For the classification of steel plates (sheets) and strips by use see Table 1. 4 Ordering content
4.1 Contracts or orders based on this Standard shall include the following contents: a) product name (steel plates (sheets) or strips);
b) standard number;
c) designation;
d) specifications and dimensions and roughness accuracy;
e) surface quality grade;
f) surface structure;
g) rim condition;
h) packaging method;
i) weight;
j) use;
k) other special requirements (such as surface orientation, etc.).
4.2 If the information is not indicated in contracts, such as dimensions and roughness accuracy, surface quality grade, surface structure type, rim condition and packaging, the supplier shall supply goods in accordance with common dimensions and roughness accuracy, relatively high-grade surface, pitted surface structure and trimming state, and packaging method of the supplier.
5 Dimensions, shape and weight
The dimensions, shape, weight and tolerances of steel plates (sheets) and strips shall be as specified in GB/T 708.
6 Technical requirements
6.1 Chemical components
For the reference values of steel chemical components (by smelting analysis) see Annex A. If the purchaser has any requirement for chemical components, it shall be as agreed on when an order is placed. For the cross-reference table of similar domestic 7 Dimensions and shape - - Appropriate measuring instruments
7.3 r90 is calculated at 15% of strain; when average elongation is less than 15%, strain is calculated at the end of average elongation. n90 is calculated from the strain range of 10% ~ 20%; when average elongation is less than 20%, the strain range is the strain from 10% to the end of average elongation.
8 Inspection rules
8.1 Inspection and acceptance of steel plates (sheets) and strips shall be carried out by the inspection department of the supplier.
8.2 Steel plates (sheets) and strips shall be accepted by batch. Each batch for inspection shall consist of steel plates (sheets) and strips of same designation, same specification and same processing condition. Weight of each batch shall not be greater than 30 t; for steel strips with a coil weight greater than 30 t, each coil is a batch for inspection.
8.3 Sample numbers and sample methods of steel plates (sheets) and strip shall be as specified in Table 7.
8.4 Reinspection and criteria for steel plates (sheets) and strips shall be as specified in GB/T 17505.
8.5 Test results of chemical components and mechanical properties shall be rounded off using the rounded-off value comparison method; the rules for rounding off shall be as specified in GB/T 8170.
9 Packaging, marking and quality certification
Packaging, marking and quality certification of steel plates (sheets) and strips shall be as specified in GB/T 247. If the purchaser has special requirements for packaging, they shall be as agreed on during ordering.

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