③ special purpose carbon steel, such as bridge steel, marine steel, basically carbon structural steel representation, but showing the use of steel last additional letters. 2. Quality carbon structural steel ① steel beginning of the two figures that the carbon content of steel, the average carbon content of the very few expressed Zibo, for example, the average carbon content of 0.45% by Zibo stainless steel rings, screws, steel number "45" It is not a sequence number, it can not be read as 45 steel. ② high manganese content in high-carbon steel, manganese should be marked, for example 50Mn. ③ boiling steel, semi-killed steel and special-purpose high-quality carbon structural steel should last particularly marked in the steel, for example, the average carbon content of 0.1% of the semi-killed steel, the steel No. 10b. 4. Cutting Steel ① steel dubbed in the "Y" Zibo stainless steel hexagonal, as distinct from high-quality carbon structural steel. ② the letter "Y" after the carbon content to the average carbon content of the few that, for example, the average carbon content of 0.3% of free cutting steel, the steel is "Y30". ③ higher manganese content, but also in the steel post marked "Mn", for example "Y40Mn". Zibo 304 stainless steel screw bolt 316 screws | Zibo | 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 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 into the brilliant and you work for a better future!