1. Introduction
Carbon structural steel cold-rolled sheet and band is a type of medium and heavy low-alloy steel that is mainly used for cold-forming operations. It has good ductility, weldability and machinability, but its strength and hardness are lower than those of ordinary structural steel. It is mainly used for roller or cold punching die or special alloy steel parts made of alloy steel, automotive components, heavy machinery, hull structure and shipbuilding. Great stand.
2. Definition
GB 13237-91 specifies the specifications, appearance, microstructure, index and inspection inspection of carbon structure steel cold rolled sheet and band steel.
3. Standard Requirements
1)Chemical composition (mass fraction, %): The test chemical composition of the product shall conform to the requirements specified in Table 1
2)Appearance: The appearance of the product should be tidy, and the surface should not have defects that affect the use.
3) Microstructure: The microscopy of the product should conform to the requirements specified in Table 2
4)Mechanical performance: With regard to the mechanical properties of the product, the tensile test should be carried out according to the requirements of GB/T228.1-2003, and the yield strength, the tensile strength and the elongation must comply with the requirements specified in Table 3.
4. Inspection
1)Inspection items: According to the requirements of the product, items such as the chemical composition, the appearance of the surface, the thickness, the microstructure, the mechanical properties and the non-destructive inspection should be inspected.
2)Inspection method: The inspection methods of major parameters of the product should generally meet the requirements of relevant national standards, while some parameters need to be directly tested.
5. Conclusion
GB 13237-91 specifies the specifications, appearance, microstructure, index, inspection and inspection requirements of carbon structural steel cold rolled sheet and band steel. In the inspection of this product, it needs to meet the requirements set by this standard through artificial or technical means, and the inspection items are relatively comprehensive.
