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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 5213-2008 Cold rolled low carbon steel sheet and strip. In addition to a number of editorial changes, the following technical changes have been made with respect to GB/T 5213-2008:
—— the application scope of the product and nominal thickness range are modified (see Clause 1 of this standard; and Clause 1 of Edition 2008);
—— the lower limit of tensile strength of designation DC06 is modified (see Clause 4 of this standard; and Clause 4 of Edition 2008);
—— the requirement for elongation after fracture is added in accordance with different class intervals of nominal thickness (see Table 4)
—— the requirement for FC surface quality in stretcher strain marks of designation DC01 is added (see Table 5);
—— “surface quality”, “shape and dimension”, as well as the corresponding test methods and requirements are added in the inspection items of Table 7 (see Table 7)
—— the reference values of chemical composition of steel are modified (see Annex A of this standard; and Annex A of 2008 edition);
—— Cross Reference between domestic and foreign designations in Annex B is modified (see Annex A of this standard; and Annex A of 2008 edition).
This standard was proposed by the China Iron and Steel Industry Association.
This standard is under jurisdiction of SAC/TC 183 National Technical Committee on Iron and Steel of Standardization Administration of China.
The previous editions of this standard are as follows:
——GB/T 5213-1985, GB/T 5213-2001, and GB/T 5213-2008.
Cold rolled low carbon steel sheet and strip
1 Scope
This standard specifies the terms and definitions, classification and designation expression methods, order details, dimension, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and product quality certificate for cold rolled low carbon steel sheet and strip.
This standard is applicable to cold rolled low carbon steel sheet and strip (hereinafter referred to as steel sheets and strips) with cold forming thickness no greater than 3.5 mm.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 223.9 Iron, steel and alloy - Determination of aluminium content - Chrom 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 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method
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 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 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 (r-values)
GB/T 5028 Metallic Materials-Sheet and Strip-Determination of tensile strain hardening exponent( n-values)
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 specimen 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 expression methods
3.1 Classification
3.1.1 See Table 1 for the classification of steel sheets and strips by the application.
Table 1 Classification of steel sheets and strips by the application
Designation Application
DC01 Common use
DC03 Drawing
DC04 Deep drawing
DC05 Special deep drawing
DC06 Extra-deep drawing
DC07 Super extra-deep drawing
3.1.2 See Table 2 for the classification of steel sheets and strips by surface quality.
Table 2 Classification of steel sheets and strips by surface quality
Class Code
Fairly high surface FB
High surface FC
Super-high surface FD
3.1.3 See Table 3 for the classification of steel sheets and strips by surface structure.
Table 3 Classification of steel sheets and strips by surface structure
Surface structure Code
Glossy surface B
Pitted surface D
3.2 Designation expression methods
The designation of steel sheets and strips is composed of three parts, the first part is letter D, representing steel sheets and strips for cold forming; the second part is letter C, representing the cold rolled condition; the third part is a two-digit serial NO., i.e. 01, 03 and 04, etc.
For example: DC01
D—— steel sheets and strips for cold forming
C—— cold-rolled condition
01—— digital serial No.
4 Order contents
4.1 Contracts or orders made based on this standard shall cover the following items:
a) product name (steel sheet or strip);
b) executive standard number;
c) designation;
d) specification, dimension and roughness precision;
e) surface quality class;
f) surface structure;
g) edge condition;
h) manner of packaging;
i) weight;
j) application;
k) other special requirements (for example surface orientation, etc.).
4.2 If information, e.g. dimension and roughness precision, surface quality class, surface structure type, edge condition and packaging, is not specified in the order contract, the supplier shall supply the trimmed steel sheets/strips in common size and roughness precision, fairly high class and pitted surface structure, and shall pack the products in the manner given by the supplier.
5 Dimension, shape and weight
The dimension, shape, weight and permissible deviation of steel sheets and strips shall meet those specified in GB/T 708.
6 Technical requirements
6.1 Chemical composition
See Annex A for reference values of chemical composition (smelting analysis) of steels. If the demander has any requirement for chemical composition, it shall be agreed in order. See Annex B for the cross reference of designations between domestic and foreign standards.
Foreword i
1 Scope
2 Normative references
3 Classification and designation expression methods
4 Order contents
5 Dimension, shape and weight
6 Technical requirements
7 Test methods
8 Inspection rules
9 Packaging, marking and quality certificate
Annex A (Informative) Chemical composition of steel
Annex B (Informative) Cross reference between domestic and foreign designations
