2.0 Scope
This standard specifies the requirements and test methods for cold rolled low carbon steel sheets and strips for continuous hot dip galvanizing process.
2.1 Referenced Standard
The following referenced documents are indispensable for the application of this standard. Any edition prohibited by this standard shall be replaced by the latest edition.
GB/T 1140 Terminology for Steel
GB/T 1732 Terminology for galvanizing
GB/T 2014 Hot-rolled alloy structural steel plates
GB/T 2295 Cold-rolled low-carbon steel sheets and strips for galvanizing
GB/T 2518 Prepainted hot dip galvanized steel sheets and coils
GB/T 2975 Steel and steel products--Location and preparation of samples and test pieces for mechanical testing
GB/T 2976 Hot-rolled low carbon steel sheet and strip for continuous galvanizing
GB/T 2977 Mechanical properties of hot-rolled and cold rolled steel sheets and strips at room temperature
GB/T 4568 Continuous hot dip galvanizing of low-carbon steel sheet and strip
GB/T 15930 Steel sheet and strip for cold forming
2.2 Page 2 of 5
3.0 Terms and definitions
3.1 Page 3 of 5
For the purpose of this standard, the following terms and definitions shall apply.
3.1.1 Carbon steel sheet and strip for continuous hot dip galvanizing
Cold rolled low carbon steel sheets and strips (hereinafter referred to as Cold Rolled Sheets and Strips) suitable for the continuous hot dip galvanizing process.
3.1.2 Steering anti-picking
A method of cold rolling in which oil is applied locally on certain areas of the surface of the steel to prevent cracking during cold rolling.
3.2 Abbreviations and acronyms
For the purpose of this standard, the following abbreviations and acronyms shall apply.
3.2.1 DCT Dimensional control table
3.2.2 DESTT Dimensional and edge surface texture test
3.2.3 GYT Gavage water temperature
3.2.4 MCT Mechanical control table
3.3 Symbols
3.3.1 Page 4 of 5
YYY Chemical composition of target output
$$B$$ Average value of tensile strength
$$b$$ Average value of elongation
$$M$$ The maximum value of the residual stress
$$K$$ The Permeability coefficient
$$H$$ The coefficient of hard center
$$gamma $$ The degree of cold rolling.
4.0 Requirements
4.1 Chemical composition
The chemical composition of cold rolled steel sheets and strips (mass fraction, %) shall conform to the requirements of Table 1.
Table 1 Chemical composition requirements
5.0 Test methods
5.1 Page 5 of 5
Dimensional and edge surface texture test
The dimensional requirements and edge surface texture requirements of the cold rolled sheets and strips shall be in accordance with the requirements specified in Table 2
Table 2 Dimensional and Edge surface texture requirements
5.2 Mechanical properties
The mechanical properties of Cold Rolled Sheets and Strips shall meet the requirements specified in Table 3.
Table 3 Mechanical requirements
6.0 Product inspection
Products supplied in accordance with this standard shall, upon acceptance by the purchaser, be subject to full inspection. The inspection items and requirements shall be in accordance with Table 4.
Table 4 Product inspection requirements
