Kunshan giant Kerry Fastening System Co., Ltd.
Contact: Liu total
Address: Kunshan City, Jiangsu Province, Kunming City, 2188 North Road
Hexagon socket head cap screws have an important industrial mission, as long as there is industry on Earth, the function of screws is always important. The countersunk head hexagon screw is an indispensable industrial necessity in daily life: the use of miniature screws such as cameras, eyeglasses, watches and clocks, electronics, etc .; general screws for television, electrical products, musical instruments, furniture, etc .; as for engineering, Large screws, nuts; traffic equipment, aircraft, trams, cars and other sizes and screws are used.
Currently on the market Shen head hexagon screw main carbon steel, stainless steel, copper three kinds of materials:
A carbon steel. We distinguish between low carbon steel, medium carbon steel and high carbon steel and alloy steel by the carbon content of carbon steel.
1 low carbon steel C% ≤ 0.25% Domestic commonly known as A3 steel. Abroad, basically called 1008,1015,1018,1022 and so on. Mainly used for 4.8 bolts and 4 nuts, small screws and other products without hardness requirements. (Note: Drill tail nail is mainly made of 1022 material.)
2 medium carbon steel 0.25%
3 high carbon steel C%> 0.45%. Currently not used on the market
4 alloy steel: carbon steel alloy elements added to increase the steel's special properties: such as 35,40 Cr-Mo, SCM435,10B38. Aromatic screws mainly use SCM435 chromium molybdenum alloy steel, the main ingredients are C, Si, Mn, P, S, Cr, Mo.
Two stainless steel. Performance level: 45,50,60,70,80
1 The main sub austenite (18% Cr, 8% Ni) good heat resistance, corrosion resistance, good solderability. A1, A2, A4
2 martensite, 13% Cr Corrosion resistance is poor, high strength, good wear resistance. C1, C2, C4 ferritic stainless steel. 18% Cr upsetability is better, corrosion resistance stronger than martensite. Imported materials on the market are mainly Japanese products. Mainly by grade SUS302, SUS304, SUS316.
Three copper. Commonly used materials for brass ... zinc-copper alloy. The main market with H62, H65, H68 copper standard parts.