AISI 4140/ JIS SCM440/ DIN 42CrMo4 HOT ROLLED ALLOY STEEL BAR is a medium carbon, chromium-molybdenum, through-hardening alloy steel that has a good hardenability with high strength and toughness as well as good fatigue and impact resistance after heat treating.
|Standard||Grade||Chemical composition (%)|
Hot rolled round bar: dia16mm-dia310mm
Hot rolled flat bar: thickness5mm-30mm, width50mm-130mm
Hot rolled square bar: 16mm*16mm-100mm*100mm
Available Heat Treatment
Hot working temperature ℃: 1050-850
Annealing temperature ℃: 680-720
Normalizing temperature ℃: 840-880
Quenching temperature ℃: 820-850 water, 830-860 oil
Tempering temperature ℃: 540-680
Good overall combinations of strength, toughness, wear resistance and fatigue strength.
Typical applications for 4140 HR bar are sprockets, bolts, chain pins, drill collars, universal joints, highly stressed parts or parts subject to severe wear.
Hot rolled, black surface / bright surface with customers’ required heat treatment