AISI 4150 is a medium-carbon chromium-molybdenum alloy steel offering high strength, toughness, and the ability to respond to heat treatment. It is used for heavy-duty shafts, gears, and demanding mechanical components.
AISI 4150 is a chromium-molybdenum alloy steel developed for engineering applications requiring a combination of strength, toughness, and hardenability. Its alloy composition and medium-carbon content allow it to achieve useful mechanical properties through appropriate heat treatment.
The grade is commonly used in heavy-duty shafts, gears, high-strength machine components, and industrial equipment exposed to substantial mechanical loads. Depending on the supplied condition and heat treatment, it can be selected for components requiring improved strength and resistance to mechanical stress. Material certification, section size, and required mechanical properties should be evaluated before use. Typical Applications: Heavy-duty shafts, gears, high-strength components, industrial machinery, and mechanical power-transmission systems.Final chemical, mechanical properties, dimensions and tolerances are confirmed against the governing specification and purchase order.
| Element | Symbol | Min (%) | Max (%) | Nominal Target |
|---|---|---|---|---|
| Carbon | C | 0.48% | 0.53% | 0.50% |
| Manganese | Mn | 0.75% | 1.00% | 0.88% |
| Chromium | Cr | 0.80% | 1.10% | 0.95% |
| Molybdenum | Mo | 0.15% | 0.25% | 0.20% |
| Silicon | Si | 0.15% | 0.35% | 0.25% |
| Phosphorus | P | — | 0.035% | Max 0.035% |
| Sulfur | S | — | 0.040% | Max 0.040% |
| Iron | Fe | Balance | Balance | ~96.8% |
| Condition / Thermal State | Tensile Strength (Rm) | Yield Strength (Re) | Elongation (A5) | Hardness (HBW / HRC) |
|---|---|---|---|---|
| As-Rolled / Hot Rolled | 730 – 850 MPa | 480 – 580 MPa | 15% – 22% | 217 – 255 HBW |
| Cold Drawn (Annealed Stock) | 800 – 920 MPa | 650 – 750 MPa | 10% – 16% | 235 – 275 HBW |
| Normalized (870°C) | 750 – 880 MPa | 500 – 600 MPa | 14% – 20% | 223 – 262 HBW |
| Annealed (Spheroidized) | 620 – 700 MPa | 380 – 450 MPa | 20% – 28% | 180 – 210 HBW |
| Oil Quenched & Tempered (High Strength) | 1,100 – 1,400 MPa | 950 – 1,200 MPa | 8% – 14% | 32 – 42 HRC (300 – 390 HB) |
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