NutChina API 1.6563 4130 4340 4140 4145 Hot Rolled Qt Harden Quenched Tempered Oil Alloy Steel Round Bar, Find details about China Alloy Steel Rod, Round Steel Rod from API 1.6563 4130 4340 4140 4145 Hot Rolled Qt Harden Quenched Tempered Oil Alloy Steel Round Bar