The national standards for cold-rolled steel plates mainly include the "National Standards of the People's Republic of China: Dimensions, Shape, Weight, and Allowable Deviation of Cold Rolled Steel Plates and Strips (GB/T708-2006)" and "Cold Rolled Thin Steel Plates and Strips for Carbon Structural Steel (GB/T 13237-1991)". These standards provide detailed requirements for the dimensions, shape, weight, allowable deviation, and mechanical properties of cold-rolled steel plates.
Specifically, the "National Standard of the People's Republic of China: Dimensions, Shape, Weight, and Allowable Deviations of Cold Rolled Steel Plates and Strips (GB/T708-2006)" mainly applies to cold-rolled steel strips and their shear products. It has redefined the classification and codes, added recommended nominal thicknesses for steel plates and strips, and redefined the allowable deviations for thickness, width, length, unevenness, skew, and sickle bending.
The "Cold Rolled Thin Steel Plates and Strips of Carbon Structural Steel (GB/T 13237-1991)" roughly divides cold-rolled thin steel plates into three levels, namely P level for ordinary stamping, S level for deep stamping, and Z level for deep stamping. In addition, the Chinese metallurgical standard YB/T 5059-1993 "Cold Rolled Steel Strips of Low Carbon Steel" divides thin steel plates into five levels according to hardness, including special grade, soft, semi soft, low hard, and cold hard.
In addition, there are some standards for cold-rolled stainless steel plates, such as the "Cold Rolled Stainless Steel Plates" standard (GB/T 3280-1992), which specifies the dimensions, shape, weight, and allowable deviations of cold-rolled stainless steel plates.
In terms of supplementary information, the quality standards for cold-rolled coils are divided into general purpose and special purpose according to their use, and into bright coil, mirror coil, and non oriented coil according to their surface condition. The chemical composition and physical performance requirements are also very strict, including the specific gravity of elements such as carbon, silicon, manganese, phosphorus, and sulfur, as well as multiple standards such as tensile strength, yield point, and elongation.
