Stainless steel screws 304 316 5 bolts. Alloy structural steel ① steel beginning of the two figures that the carbon content of steel, the average carbon content of the very few that Dongying locking locking screws, such as 40Cr. ② major alloying elements in steel, in addition to individual micro-alloying elements, generally a few percent. When the average alloy content <1.5%, steel elements generally marked only symbols, not marked content, but prone to cause confusion in exceptional circumstances, after the element symbol can also be marked with the number "1", such as steel "12CrMoV" and "12Cr1MoV" Jining locking locking screw, the former chromium content of 0.4-0.7%, which is 0.9-1.2%, the remaining ingredients are all the same. When the average content of alloying elements ≥1.5%, ≥2.5%, while ≥3.5% ......, in the back of the element symbols should be marked content Yantai locking locking screws can be expressed as the corresponding 2,3,4 ...... and so on. For example 18Cr2Ni4WA. 6. Representation of high strength low alloy steel ① basically the same as alloy structural steel. ② for professional use high strength low alloy steel locking locking screws, should last marked in the steel. For example 16Mn steel, special steel for the bridge as "16Mnq", a special steel automobile frames as "16MnL", special steel pressure vessel is "16MnR". Stainless steel screws, stainless steel double carriage, stainless steel adapter Binzhou locking locking screw, locking locking screw, 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!