ASTM4142 has high strength and hardenability and good toughness. When quenching, the deformation is small, when high temperature,creep strength and rupture strength is high.

AISI 4140 Steel round bar has high tensile strength and toughness values features. We can supply all AISI 4140 hot rolled round bar sizes. And AISI 4140 forged round bar application is very widely.

ASTM 4130 Steel round bar is a kind of structural alloy steel round bar under ASTM A29/A29M-04 standard. Equivalent material for ASTM4130 is 30CrMo(China), SCM430(SCM2)(Japanese), 34CrMo4(1.7220)(Germany).

1340 round bars has high Strength, plasticity and wear resistance, but the cold deformation plasticity is not high, weldability is poor.