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Delta 355 steel cutting machine rotor 7 teeth where to sell? Steel is carbon content at 0.04%-2.3% between the iron carbon alloy.In order to ensure its toughness and plastic,Carbon content generally does not exceed 1.7%.The main elements of steel are except iron and carbon,, Manganese, sulfur, phosphorus, etc.The classification methods of steel are various,2.(1) Carbon Steel:.Low carbon steel;B.Medium carbon steel;C.(2) alloy steel:.Low alloy steel;B.Medium alloy steel;C.(2) forged steel;(2) cast steel;(3) hot rolled steel;(1) Construction and Engineering Steel:.Ordinary carbon structural steel;B.Low alloy structural steel;C.Steel bars.A.Steel for mechanical manufacturing: (a) tempered structural steel;(B) surface hardening structural steel: Including carbon steel, ammonia-infiltrating steel and surface hardening steel;(C) easy-to-cut structural steel;Steel: including cold stamping steel, cold heading steel;B.Spring Steel;C.(3) tool steel:.Carbon tool steel;