7. Spring steel spring steel can be divided according to the chemical composition of carbon spring steel and alloy spring steel two categories, its steel representation, the former is basically the same high-quality carbon structural steel Linyi stainless steel drilling screw, which is basically the alloy structural steel the same. 8. Rolling steel ① preceded by the letter "G", expressed rolling bearing steel class. Stainless steel bolts, screws Linyi 304 stainless steel lock nut, screw ② carbon content of 316 high carbon chromium bearing steel steel is not marked Linyi stainless steel, chromium content of a few thousandths. For example GCr15. Steel representation carburizing bearing steel, structural steel and alloys basically the same. Stainless steel screws. Stainless steel screws, stainless steel lock nut 10. Stainless steel and heat-resistant steel ① carbon content of a few thousandths. Such as "2Cr13" average carbon content of the steel is 0.2%; if the carbon content in steel or ≤0.08% ≤0.03% by Linyi stainless steel 316, steel, respectively, before the word "00" and "0", the example 00Cr17Ni14Mo2, 0Cr18 Ni9 like. ② major alloying elements in steel to a few percent, said the titanium, niobium, zirconium, nitrogen and other press said alloy structural steel for the representation of micro-alloying elements indicated Linyi Linyi stainless steel cotter pin _ _ Jinan Road ground by the Jinan Daoqin Trading Limited. 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!