High-strength hexagon bolts are available in 3 materials, as follows:
(1) Carbon steel. Generally, the manufacturers of hexagonal bolts distinguish low-carbon steel, medium-carbon steel, high-carbon steel and alloy steel based on the carbon content of the carbon steel material.
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 and grade 4 nuts, small screws. (Note: 1022 material is mainly used for drill tail nails.)
2. Medium carbon steel 0.25%
3. High carbon steel C%>0.45%. At present, the hexagon bolt standard is basically not used in the market.
4. Alloy steel: Hexagon bolt manufacturers 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.
(2) Stainless steel. Performance level: 45, 50, 60, 70, 80
Hexagon bolt manufacturers are mainly divided into austenite (18%Cr, 8%Ni) with good heat resistance, good corrosion resistance and good weldability. A1, A2, A4
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. Currently imported materials on the market are mainly Japanese products. According to the level, it is mainly divided into SUS302, SUS304, and SUS316.
(3) Copper
The commonly used materials for hexagon bolt manufacturers are brass...zinc-copper alloy. The market mainly uses H62, H65, H68 copper as standard parts.
The three materials of high-strength hexagonal bolts are introduced here. I hope everyone should pay attention to the distinction when purchasing.