At present, there are many standards and grades used in China’s cold-rolled coil market. The performance of the corresponding grades of each standard is roughly similar, but there are subtle differences. The technical standards include: Japanese standard JIS Z 3141-1994 (corresponding to the basic grade SPCC), Germany Standard DIN 1623-1 (corresponding to basic grade ST12), European standard EN10130-2006 (corresponding to basic grade DC01), national standard GB/T708-2006 (corresponding to basic grade Q195, Q235), GB/T 5213-2008 (corresponding to basic grade DC01) ) and corporate or international standards adopted by some steel mills.
There are two types of Chinese standard numbers for the above-mentioned executive standards. Among them, the Chinese standard GB/T708-2006 is based on the yield strength. The disadvantage is that it is difficult to distinguish it from other steel grades; Non-common carbon cold rolling implementation standards are otherwise specified. At present, there are many technical standards adopted by market resources, but the actual process gap is not large. All standards may be adopted, and the national standard GB/T 5213-2008 may be the first choice. The specific standard content can be understood by yourself.
Currently on the market, 1.0mm thick, 1250mm or 1500mm or 1000mm wide rolls or plates are used as the base price, and the length of the plate is usually 2500mm or 3000mm.
Related grades and suffixes:
Japanese standard JIS Z 3141-1994: SPCC general use, SPCD drawing use, SPCE deep drawing use, and its modulation (distinguishing the annealing state), usually the SPCC is actually SPCC-S, which means standard modulation, 1 8, 1/4, 4, 1/2, 2, and 1 are cold-rolled hard coils.
T stands for guaranteed tensile test. SPCCT is a cold-rolled sheet for general use but guaranteed tensile test. Its tensile strength is higher than that of SPCC, but it cannot perfectly meet the tensile or stamping conditions. B: Represents glossy surface D: Represents pockmarked surface, matte finish. Other suffixes such as DT and MB are recorded by their function acronyms, DT refers to elevators, and MB refers to door panels. For example, SPCC-SD is a fully annealed pitted ordinary cold rolled steel sheet.
National standard GB/T 5213-2008 and European standard EN10130-2006, the grades are DC01 for general use, DC03 for stamping, DC04 for deep drawing, DC05 for extra deep drawing, DC06 for extra deep drawing, and DC07 for extra deep drawing. In the national standard, the surface quality is classified as FB advanced surface, FC advanced surface, and FD super advanced surface; in European standard, the surface quality is classified as grade A and grade B.
In the national standard, the surface finish B is smooth, and D is pitted; in the European standard, b is bright, g is semi-bright, m is normal, and r is rough (refer to the original standard for specific roughness data).
The German standard DIN 1623-1 grades are ST12, USt13, ST13, ST14, and the surface finish follows the European marking method. The surface quality is classified as O3 and O5. The example ST12O3r is a common cold-rolled steel sheet. The surface quality is generally as follows: rough.