China Solid Steel Bar 4140, Special Steel Scm440, 708m 40, 2244, 1.7225, AISI/ASTM 4140 Hot Rolled Alloy Steel, Find details about China Special Steel, Tool Steel from Solid Steel Bar 4140, Special Steel Scm440, 708m 40, 2244, 1.7225, AISI/ASTM 4140 Hot Rolled Alloy Steel