Pre-market standard parts are mainly carbon steel, stainless steel, copper three kinds of materials. A 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% is commonly called A3 steel in China. 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 made of 1022 materials.)
2 medium carbon Steel 0.25% 3 High carbon c%>0.45%.
The current market is basically not used 4 Alloy Steel: Add alloying elements to the carbon steel, increase some special properties of steel: such as 35, 40 chromium molybdenum, scm435,10b38.
Fangsheng screws mainly use SCM435 chromium-molybdenum alloy steel, the main components are C, Si, Mn, P, S, Cr, Mo. Two stainless steel.
Performance level: 45,50,60,70,80 1 Main parts of Austenite (18%CR, 8%ni) heat resistance, good corrosion resistance, good weldability.
A1,a2,a4 2 martensite, 13%CR corrosion resistance is poor, high strength, good wear resistance. C1,C2,C4 iron ferrite Stainless steel. 18%CR upsetting is better and the corrosion resistance is stronger than that of martensite. The imported materials on the market are mainly Japanese products.
SUS302, SUS304 and SUS316 are mainly divided by grade. Three 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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