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-digit representation of the carbon content of steel, the average carbon content of the very few that Zibo stainless steel rivets, for example, the average carbon content of 0.45% steel, steel number "45" Zibo stainless steel Allen, 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. GB / T 3098.16-2000 Mechanical properties of fasteners stainless steel set screws GB / T 3098.17-2000 Mechanical properties of fasteners - Preloading test for detection of hydrogen embrittlement - Parallel bearing surface method GB / T 3098.18-2004 Mechanical properties of fasteners blind rivet Test methods GB / T 3098.19-2004 Mechanical properties of fasteners blind rivet GB / T 3098.2-2000 Mechanical properties of fasteners Coarse thread GB / T 3098.20-2004 Mechanical properties of fasteners ensure wing nut torque GB / T 3098.21-2008 fastener mechanical properties of stainless steel tapping screws GB / T 3098.22-2009 Mechanical properties of fasteners fine-grained non-quenched and tempered steel bolts, screws and studs stainless steel screws. Stainless steel nuts, stainless steel adapter, stainless steel screws, stainless steel top wire Zibo 304 bolts, stainless steel disc spring Zibo, large stainless steel flat head screws stainless steel machine screws, the screws 304, 316 stainless steel screw bolt _ Jinan, Zibo Road ground (certified) _ Zibo By Jinan Daoqin Trading Company. Jinan Daoqin Trading Company (www.daoqinshangmao.com) (www.daoqinshangmao.com) Shandong Jinan, hardware accessories leader over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. Jinan Road ground in leadership with the staff warmly welcome all inquiries negotiations to create the Jinan Daoqin better future.