The weldability of 4130 steel sheet is excellent. 4130 is resistant to scaling and oxidation and has a clean, smooth finish.

General purpose alloy steel suitable for gears, machine parts, cams, short run dies, spindles, bolts, zinc die cast dies, low cost molds and other components requiring an elevated tensile strength. Better wear resistance than carbon steels.

4340 alloy steel is a low alloy steel with high toughness in an annealed state. 4340 alloy steel is characterized by its outstanding ductility, formability, and weldability rendering it an excellent metal .