The specific classification of screw wire is basically as follows:
The standard parts mainly include carbon steel, stainless steel and copper. (1) Carbon steel: low carbon steel, medium carbon steel, high carbon steel and alloy steel.
1. Low carbon steel: A3 steel (Q235 high line), SWRCH6A, 8A (ML08AL), 15A, 18A (1018), 22A (1022). (Mainly used for products with no hardness requirements such as 4.8 bolts, 4 grade nuts, small screws, etc.)
2, medium carbon steel: 1 domestically known as 35, 45 steel. 2 Foreign countries are basically called 1035 and SWRCH35K. (Mainly used for 8 grade nuts, 8.8 grade bolts, 8.8 grade hexagonal products.)
3, high carbon steel: C%>0.45%, basically not used in the market.
4, alloy steel:
1 Refers to steels containing some other alloying elements (such as silicon, manganese, chromium, nickel, vanadium, molybdenum, etc.) in addition to carbon. For grade 12.9 screws, chromium-molybdenum alloy steels such as SCM435 are mainly used.
2 Adding alloying elements to carbon steel, adding some special properties of steel: 35CrMo (SCM345), 35CrMo (SCM440).
3 Fangsheng screws use: SCM435 chromium-molybdenum alloy steel. (Main components: C, Si, Mn, P, S, Cr, Mo).
(2) Stainless steel:
1 Mainly divided into martensitic stainless steel, austenitic stainless steel, ferritic stainless steel and so on.
2 Performance levels: 45, 50, 60, 70, 80 (usually SUS200 series, SUS302, SUS304, SUS316, SUS410, etc.)
3 Imported materials are mainly Japanese products. (Mainly divided into SUS302, SUS304, SUS316 by level)
(3) Copper: Commonly used materials are brass, zinc-copper alloy. (Mainly use H62, H65, H68 copper as standard parts.)
Selection of carbon steel screw materials
Second, the specific summary of the screw wire
1. The main chemical components in steel are: C, Mn, P, S, Si, Cu, Al, and the lower the content of Al and Cu, the better.
Classification of commonly used screw wires
Third, the detailed type of wire
1, wire:
Galvanized wire, normal wire, high wire, iron wire, spring steel wire, disk round (bar), welding wire, superior wire, hard wire, ordinary carbon round steel, wire, cold drawn wire
2, special steel:
Carbon steel, composite steel, bearing steel, die steel, spring steel, gear steel, carbon steel, low alloy steel, low carbon steel
3, stainless steel:
Stainless wire, stainless steel plate, stainless steel plate, stainless steel wire, stainless steel pipe, stainless seamless pipe, stainless welded pipe, stainless steel strip, stainless steel angle, stainless hexagonal steel, stainless steel round, stainless steel rod, Stainless steel hot-rolled steel strip, stainless steel and heat-resistant steel cold-rolled steel strip, spring stainless steel cold-rolled steel
4. Non-ferrous metals:
Copper, aluminum, lead, zinc, tin, nickel, cobalt, bismuth, antimony, magnesium, cadmium, titanium, rare metals
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