About the three materials of fasteners

Standard parts on the market mainly include 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 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%. At present, it is basically not used in the market.

4. Alloy steel: Add alloy elements to ordinary carbon steel to increase some special properties of steel: such as 35, 40 chromium molybdenum, SCM435, 10B38. (Guide: Analysis of the causes of damage to high-strength bolts)

(2) Performance grade of stainless steel: 45,50,60,70,80.

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) Commonly used copper materials are brass and zinc-copper alloy. The market mainly uses H62, H65, H68 copper as standard parts.

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