SAE / AISI 4150 Steel
AISI 4150 steel 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.AISI 4150 steel 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:
- For automotive and aircraft components with high toughness as tyres, rings, axles, bushes, shafts, steering components.
- Statically and dynamically stressed components for vehicles, engines and machines
- For parts of larger cross-sections. Components for driving gears, axles, rolls, rings.
AISI 4150 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 |
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 |
Chemical Composition per ASTM A29
| GRADE | C | Si | Mn | P | S | Cr | Mo |
| 4150 | 0.48-0.53 | 0.15-0.35 | 0.75-1.00 | ≤ 0.035 | ≤ 0.040 | 0.80-1.10 | 0.15-0.25 |
AISI 4150 Steel 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 |
Forging for AISI 4150 Steel
- Preheat AISI 4150 steelengineering steel uniformly and slowly;
- Increase the forging temperature up to 1150-1200°C;
- hold suitable time for the steel to be thoroughly heated before forge;
- Reheat steel when temperature below 950°C;
- Cooling as slowly as possible in sand after forged.
Heat Treatment
Soft Annealing
- Heat the steel to 680-720°C uniformly and slowly
- hold suitable time for the steel to be thoroughly heated
- cool slowly in furnace
- maximum Brinell hardness of 248.
Normalizing: 840-860°C,cool in air
Hardening:820 – 860°C,oil quench
Tempering:540-680°C,cool in air
Hardness after heat treatment
- Annealed at 815°C: 197 HB
- Normalized at 870°C: 321 HB
- Oil quenched, fine grained, tempered at 205°C: 530 HB
- Oil quenched, fine grained, tempered at 315°C: 495 HB
- Oil quenched, fine grained, tempered at 425°C: 440 HB
- Oil quenched, fine grained, tempered at 540°C: 370 HB
- Oil quenched, fine grained, tempered at 650°C: 290 HB
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