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Fasteners of three material greatly entire
Aug 22, 2016

Standard parts on the market there are three kinds of carbon steel, stainless steel, copper materials.

(A) carbon steel we have to distinguish the content of carbon in carbon steel-carbon steel, medium carbon steel and high carbon steel and alloy steel.

1, low carbon steel C% ≤ 0.25% commonly referred to as A3 steel in China. Abroad are called 1008,1015,1018,1022. Mainly used for grade 4.8 bolts and 4 nuts, screws, and no hardness requirements of the product. (Note: the main 1022 material drilling screws. )

2, carbon steel 0.25%.

3, high carbon steel C%>0.45%. Barely used currently on the market.

4, alloy: adding alloying elements in carbon steel, increased steel special properties: such as 35 or 40 chromium-molybdenum, SCM435,10B38.

(B) the stainless steel grades: 45,50,60,70,80.

Main points of austenite (18%Cr, and 8%Ni), good heat resistance, good corrosion resistance, good weldability. A1,A2,A4 。 Martensite, 13%Cr poor corrosion resistance, high strength, good resistance to abrasion. C1,C2,C4 ferritic stainless steel. 18%Cr forging good corrosion resistance in martensite. Imported materials currently on the market are mainly Japan products. By level-main SUS302 and SUS304, SUS316.

(C) copper materials as brass, zinc and copper alloys. Market mainly H62, H65, H68 brass fasteners.