AISI 4140 Round Bars
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AISI 4140 is a versatile, low-alloy steel known for its high strength, toughness, and wear resistance. It contains chromium, molybdenum, and manganese, which enhance its hardenability and mechanical properties. Commonly used in the manufacturing of components like gears, shafts, and fasteners, AISI 4140 is favoured for its ability to maintain its properties under heat treatment and its excellent fatigue resistance, making it ideal for demanding industrial applications.
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| Property | Specification |
|---|---|
| Standard | AISI 4140, ASTM A29, ASTM A322, SAE J404 |
| Chemical Composition | C: 0.38-0.43%, Mn: 0.75-1.00%, P: ≤0.035%, S: ≤0.040%, Si: 0.15-0.35%, Cr: 0.80-1.10%, Mo: 0.15-0.25% |
| Tensile Strength (MPa) | 655 - 860 MPa (Normalized), 850 - 1000 MPa (QT) |
| Yield Strength (MPa) | 415 MPa (Normalized), 655 - 835 MPa (QT) |
| Elongation (%) | 20-25% (Normalized), 10-15% (QT) |
| Hardness (HBW) | 197 - 235 HB (Normalized), 270 - 330 HB (QT) |
| Modulus of Elasticity (GPa) | 205 - 210 GPa |
| Density (g/cm³) | 7.85 g/cm³ |
| Thermal Conductivity (W/m·K) | 42.6 W/m·K (at 20°C) |
| Specific Heat Capacity (J/kg·K) | 460 J/kg·K (at 20°C) |
| Heat Treatment | Hot Rolled Normalized, Quenched and Tempered (QT), Stress-Relieved depending on the desired properties |
| Applications | Gears, shafts, fasteners, connecting rods, high-stress machine parts, and components requiring high strength and toughness |
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