First, the current market standard parts are mainly carbon steel (including easy car iron and steel), stainless steel (including easy car stainless steel), copper (including fast cutting copper).
(i) Carbon steel. The carbon content of carbon steel is used to differentiate low carbon steels from low-carbon steels and high carbon steels.
1, Low-carbon Steel c%≤0.25% domestic commonly known as A3 steel. Foreign basic called 1008,1015,1018,1022 and so on. Mainly used in 4.8-grade bolts and 4-grade nuts, small screws and other products without hardness requirements. (Note: Drilling tail nails are mainly 1022 materials.) ）
2, medium carbon steel 0.25%<c%≤0.45% commonly known as 35th, 45th, the foreign basic known as 1035,CH38F,1039,40ACR. It is mainly used for Grade 8 nuts, 8.8 bolts and 8.8 hexagon products.
3, high carbon steel c%>0.45%. The market is basically unused
4, Alloy steel: In the carbon steel to add alloy elements, to increase some of the special properties of steel: such as 35, 40 chromium molybdenum, scm435,10b38. Fangsheng screws mainly use SCM435 chromium tetrachloride alloy steel, the main components are C, Si, Mn, P, S, Cr, Mo.
(b) Stainless steel. Performance level: 45,50,60,70,80
The main parts of Austenite (18%CR, 8%ni) heat resistance, good corrosion resistance, good weldability. A1,a2,a4
Martensite, 13%CR corrosion resistance is poor, high strength, good wear resistance. C1,C2,C4 ferritic Stainless steel. 18%CR upsetting is better and the corrosion resistance is stronger than that of martensite. At present, the main import materials in the market are Japanese products. According to the main points SUS302, SUS304, SUS316.
(c) Copper. Common materials for brass ... Zinc-Copper alloy. Mainly used in the market H62, H65, H68 copper to do standard parts.
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