Grades that editors 1. carbon structural steel ① by Q + digital + quality rating symbols + deoxy method symbols. Its steel dubbed "Q", on behalf of the steel yield point, the latter figure represents the yield point value Texas stainless steel bolts, such as Q235, said the unit is MPa yield point (σs) of 235 MPa of carbon steel. ② when necessary, can be marked symbols representing steel quality level and deoxygenation methods. Quality rating symbols are A, B, C, D. Deoxy method symbols: F denote boiling steel; b represents a half-killed steel: Z represents killed steel; TZ indicate special killed steel, killed steel without standard symbols, namely Z and TZ can not standard. For example Q235-AF represent Class A boiling steel. ③ special purpose carbon steel, such as steel bridges, marine steel, basically representation carbon structural steel, but said the use of additional steel last letter. 2. Quality carbon structural steel ① steel beginning of the two numbers indicate the carbon content of steel to the average carbon content of the few that, for example, the average carbon content of 0.45% of the stainless steel bolts, steel number "45", it is not sequence number, it can not be read as 45 steel. ② high manganese content of high-quality carbon structural steel Heze stainless steel bolts, manganese should be marked, such as 50Mn. ③ boiling steel, semi-killed steel and special-purpose high-quality carbon structural steel should be marked on the last special steel, for example, the average carbon content of 0.1% of the semi-killed steel, the steel No. 10b. Heze stainless steel bolts, stainless steel bolts, Jinan Road ground is provided by Jinan Daoqin Trading Company. Jinan Daoqin Trading Company (www.daoqinshangmao.com) (www.daoqinshangmao.com) strong, credible, in Jinan, Shandong and other hardware accessories industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Jinan Road ground and you work into the brilliant, for a better future!