50CrMo4 is a higher carbon variation of the chromium, manganese, molybdenum 4100 series of low alloy steels.It has high strength,toughness,and high hardenability,and also has good machinability in annealed or normalized conditions.50CrMo4 can be welded using all conventional techniques. The mechanical properties of this steel can be affected if it is welded in the hardened condition. Post-weld heat treatment should be performed followed by an approved welding procedure.
Typical Application:
1.50CrMo4 steel Supply Form & Size
Form of Supply | Size(mm) | Length(mm) |
Round bar | Φ6-Φ1,000 | 3,000-10,000 |
Square bar | 100×100-600×600 | 3,000-6,000 |
Plate/Sheet | Thickness :20-400 Width:80-1,000 |
2,000-6,000 |
Flat bar/Blcoks | Thickness :120-800 Width:120-1,500 |
2,000-6,000 |
2.Surface Finish&Tolerance
Surface Finish | Black-Forged | Black-Rolled | Turned | Grinding | Polished | Peeled | Cold Drawn |
Tolerance | (0,+5mm) | (0,+1mm) | (0,+3mm) | Best h9 | Best h11 | Best H11 | Best H11 |
3.Chemical Composition&Related Specifications
Grade | C | Si | Mn | Cr | Mo | P | S |
50CrMo4/1.7228 | 0.46-0.54 | ≤ 0.4 | 0.5-0.8 | 0.9-1.2 | 0.15-0.3 | ≤ 0.025 | ≤ 0.035 |
USA | UK | China | Italy |
4150 | 708A47 | 50CrMo | 50CrMo4 |
4.50CrMo4 Mechanical Property
Diameter d mm | ≤ 16 | 16-40 | 40-100 | 100-160 | 160-250 |
Thickness t mm | < 8 | 8-20 | 20-60 | 60-100 | 100-160 |
Yield Strength Mpa | ≥900 | ≥780 | ≥700 | ≥650 | ≥550 |
Tensile Strength Mpa | 1100-1300 | 1000-1200 | 900-1100 | 850-1000 | 800-950 |
Elongation, % | ≥9 | ≥10 | ≥12 | ≥13 | ≥13 |
Reduction of area ,% | ≥40 | ≥45 | ≥50 | ≥50 | ≥50 |
impact,J | ≥30 | ≥30 | ≥30 | ≥30 | |
Hardness,HB | 331-380 | 298-359 | 271-331 | 253-298 | 240-286 |
5. Forging for 50CrMo4
6.Heat Treatment
Soft Annealing
Normalizing: 840-860°C,cool in air
Hardening:820 – 860°C,oil quench
Tempering:540-680°C,cool in air
7.Hardness after heat treatment
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