jhflatbar limited |
AISI 4140/ JIS SCM440/ DIN 42CrMo4 FORGED 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.
Similar Grades
Standard | Grade | Chemical composition (%) | ||||||
C | Si | Mn | Cr | Mo | P | S | ||
GB | 42CrMo | 0.38-0.45 | 0.17-0.37 | 0.50-0.80 | 0.90-1.20 | 0.15-0.25 | ≤0.035 | ≤0.035 |
AISI | 4140 | 0.38-0.43 | 0.15-0.35 | 0.75-1.00 | 0.80-1.10 | 0.15-0.25 | ≤0.035 | ≤0.040 |
JIS | SCM440 | 0.38-0.43 | 0.15-0.35 | 0.60-0.90 | 0.90-1.20 | 0.15-0.30 | ≤0.030 | ≤0.030 |
DIN | 42CrMo4/ 1.7225 | 0.38-0.45 | ≤0.40 | 0.60-0.90 | 0.90-1.20 | 0.15-0.30 | ≤0.025 | ≤0.035 |
Available Size
Forged steel round bar: dia100mm-dia1500mm
Forged flat bar: thickness20mm-400mm, width80mm-1000mm
Forged steel block: 100mm*100mm-1000mm*1000mm
Available Heat Treatment
Annealing/Normalizing/Hardening/Tempering/Quenching
Hot working temperature1050-850
Annealing temperature680-720
Normalizing temperature840-880
Quenching temperature820-850 water, 830-860 oil
Tempering temperature540-680
Characteristics
Good overall combinations of strength, toughness, wear resistance and fatigue strength.
Application
Typical applications for 4140 HR bar are sprockets, bolts, chain pins, drill collars, universal joints, highly stressed parts or parts subject to severe wear.
Delivery Condition
Forged, black surface/ machined surface with customers’ required heat treatment
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