There are three kinds of Hexagonal bolt materials: carbon steel, stainless steel, copper.
Carbon steel: We distinguish low carbon steel, medium carbon steel, high carbon steel and alloy steel by carbon content in carbon steel.
1. Low carbon steel C% ≤ 0.25% is usually called A3 steel in China. It is called 1008101510181022 in foreign countries. It is mainly used for grade 4.8 bolts, grade 4 nuts, small screws and other products without hardness requirements. (Note: the drill tail nail is mainly made of 1022 material. )
2. Medium carbon steel with 0.25% ≤ 0.45% is usually called No.35 and No.45 steel in China, and it is basically called 1035, ch38f, 1039, 40ACr, etc. in foreign countries. Grade 8.8 and grade 8 bolts.
3. Alloy steel: adding alloy elements to ordinary carbon steel, increasing some special properties of steel, such as 35, 40 Cr Mo, SCM435, 10b38. Fangsheng screw mainly uses SCM435 chromium molybdenum alloy steel, the main components are C, Si, Mn, P, s, Cr, mo.
One of other Hexagonal Bolt Materials is Stainless steel: Its performance level: 45, 50, 60, 70, 80.
Austenite (18% Cr, 8% Ni) has good heat resistance, corrosion resistance and weldability.
Martensite and 13% Cr have poor corrosion resistance, high strength and good wear resistance. C1, C2, C4 ferritic stainless steel. The forging property of 18% Cr is better than that of martensite. At present, the imported materials on the market are mainly Japanese products. It is mainly divided into SUS302, SUS304 and SUS316 by level.
Copper. The common materials are brass and zinc copper alloy. H62, H65 and H68 copper are used as standard parts in the market.
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