Hexagonal head bolts are mainly made of three materials: carbon steel, stainless steel, and copper.
1. Carbon steel
We distinguish low carbon steel, medium carbon steel, high carbon steel, and alloy steel based on the carbon content in the carbon steel material.
1.1 Low carbon steel with a C% ≤ 0.25% is commonly referred to as A3 steel in China.
Abroad, it is commonly referred to as 1008101510181022, etc.
Mainly used for products without hardness requirements such as grade 4.8 bolts, grade 4 nuts, and small screws (note: drill tail screws are mainly made of 1022 material).
1.2 Alloy Steel: Adding alloy elements to plain carbon steel to enhance some special properties of the steel, such as 35 and 40 chromium molybdenum
SCM435,10B38.
Fangsheng screws mainly use SCM435 chromium molybdenum alloy steel, which is mainly composed of C, Si, Mn, P, S, Cr, and Mo.
2. Stainless steel
Performance levels: 45, 50, 60, 70, 80. Mainly composed of austenite (18% Cr, 8% Ni) with good heat resistance, corrosion resistance, and 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 forging properties and stronger corrosion resistance than martensite.
At present, the imported materials in the market are mainly Japanese products.
Mainly divided into SUS302, SUS304, and SUS316 by level.
3. Copper
The commonly used material is brass zinc copper alloy.H62, H65, and H68 copper are mainly used as standard components in the market.
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