Screw material knowledge
2021-12-21
Screw material knowledge
At present, the standard parts on the market mainly include carbon steel, stainless steel, and copper.
One carbon steel. We distinguish low-carbon steel, medium-carbon steel, high-carbon steel and alloy steel based on the carbon content of carbon steel materials.
1 Low carbon steel C%≤0.25% is usually called A3 steel in China. It is basically called 1008, 1015, 1018, 1022, etc. abroad. Mainly used for products with no hardness requirements such as grade 4.8 bolts, grade 4 nuts, small screws, etc. (Note: 1022 material is mainly used for the self-drilling nails.)
2 Medium carbon steel 0.25%
3 High carbon steel C%>0.45%. Basically not used in the market
4 Alloy steel: Add alloy elements to normal carbon steel to 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 Mainly divided into austenite (18%Cr, 8%Ni) with 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 has better upsetting and corrosion resistance than martensite. Imported materials on the market are mainly from Japan. According to the level, it is mainly divided into SUS302, SUS304, and SUS316.
Three copper. Commonly used materials are brass...zinc-copper alloy. The market mainly uses H62, H65, H68 copper as standard parts.
Haiyan Tianqi Fastener Co., Ltd.
As a Professional China Wood Lag Screws Manufacturers and Self Tapping concrete Screws Suppliers,Haiyan Tianqi Fastener Co., Ltd offer kinds of wood lag screws,Self Tapping Screws and other products,Our plant information is being updated
