... D200mmD270mm D300mm K300mm 1kg5kg15kg18kg20kg chemical composition of welding wire(%)CMnSiPSCrNiCu0.06~0.151.40~1.850.80~ ... the packs just when welding to avoid the wire rust.Before welding please clean out the oil, ... vehicles, building, and general machinery. Chemical Composition of Wire(%):CMnSiSP≤0.120.3-0.6≤0.35≤0. ... made of low alloy steel.Chemical Composition of Wire(%):CMnSiSP≤0.12≤0.16 ≤0.75≤0 ...