In the former market, standard parts mainly include carbon steel, stainless steel, and copper.
A carbon steel. We distinguish low-carbon steels, medium-carbon steels and high-carbon steels, and alloy steels from the carbon content of carbon steel.
1 Low-carbon steel C% ≤ 0.25% Domestically known as A3 steel. Basically known abroad as 1008,1015,1018,1022 and so on. Mainly used for 4.8 bolts and 4 nuts, small screws and other products without hardness requirements. (Note: The drilling screw is mainly made of 1022 material.)
2 Medium carbon steel 0.25%
3 High carbon steel C%> 0.45%. Currently not used in the market
4 Alloy steel: Adding alloying elements to plain carbon steel to increase some special properties of steel: 35, 40 chrome molybdenum, SCM435, 10B38. Fang Sheng 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 Mainly austenite (18% Cr, 8% Ni) has good heat resistance, good corrosion resistance, and good weldability. A1, A2, A4
2 Martensite and 13% Cr have poor corrosion resistance, high strength and good wear resistance. C1, C2, C4 ferritic stainless steel. 18%Cr forging property is better, corrosion resistance is stronger than martensite. Imported materials in the market are mainly Japanese products. According to the grade mainly divided SUS302, SUS304, SUS316.
Three copper. Commonly used materials for brass ... zinc copper alloy. The market mainly uses H62, H65, H68 copper as standard parts.