At Titan Steel, Mumbai Find the best SAE 4140 Alloy Steel Round Bar Manufacturers & Suppliers in Mumbai offering premium-grade bars for construction, engineering, and industrial applications. Get high-strength, precision-finished alloy steel round bars with assured quality, competitive pricing, and on-time delivery from reliable manufacturers in Mumbai.
SAE 4140 is a versatile alloy steel known for its good atmospheric corrosion resistance and well-balanced strength, toughness, wear resistance, and fatigue strength. It is commonly used in applications requiring strength and durability.
SAE 4140 alloy steel is utilized across various industries, including:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN24, EN31, EN32B, EN36C, IS2062, 42CrMo4, HCHCR, D2, D3, H-11, H-13, SCM420, SAE1018, SAE4140, C45, 20MnCr5, and others.
| Standard | Equivalent Grade |
|---|---|
| USA | 4140 |
| DIN | 1.6523 / 21NiCrMo2 |
| BS | 805M20 |
| JIS | SCM220 |
| ASTM A29 | 4140 |
| DIN 1654 | 1.6523 / 21NiCrMo2-2 |
| EN 10084 | 42CrMo4 |
| BS 970 | 150M19 |
| JIS G4103 | SNCM220 |
| Standard | Grade | C (%) | Mn (%) | P (%) | S (%) | Si (%) | Cr (%) | Mo (%) |
|---|---|---|---|---|---|---|---|---|
| ASTM A29 | 4140 | 0.38-0.43 | 0.75-1.00 | 0.035 | 0.040 | 0.15-0.35 | 0.8-1.10 | 0.15-0.25 |
| EN 10250 | 42CrMo4 | 0.38-0.45 | 0.6-0.9 | 0.035 | 0.035 | 0.4 | 0.9-1.2 | 0.15-0.30 |
| JIS G4105 | SCM440 | 0.38-0.43 | 0.60-0.85 | 0.03 | 0.03 | 0.15-0.35 | 0.9-1.2 | 0.15-0.30 |
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 655 MPa | 95,000 psi |
| Yield Strength | 415 MPa | 60,200 psi |
| Bulk Modulus | 140 GPa | 20,300 ksi |
| Shear Modulus | 80 GPa | 11,600 ksi |
| Elastic Modulus | 190-210 GPa | 27,557-30,458 ksi |
| Poisson’s Ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at Break | 25.70% | 25.70% |
| Hardness (Brinell) | 197 | 197 |
| Hardness (Knoop) | 219 | 219 |
| Hardness (Rockwell B) | 92 | 92 |
| Hardness (Rockwell C) | 13 | 13 |
| Hardness (Vickers) | 207 | 207 |
| Machinability | 65 (based on AISI 1212) | 65 |
Heat treatment is performed to enhance machinability and achieve desired mechanical properties.
SAE 4140 can be hardened by cold working or through heating and quenching. Typically, it is supplied with a hardness range of 18-22 HRC. For further hardening, heat to 840°C – 875°C, soak for 10 – 15 minutes per 25 mm section, and quench in oil, water, or polymer.
Reheat to 550°C – 700°C, hold until temperature is uniform, soak for 1 hour per 25 mm of the section, and cool in still air.
Forge SAE 4140 between 1200°C and 900°C. To achieve a finer grain size, avoid forging below 900°C and ensure slow cooling after forging in oil or water.
Heat treatment is performed to enhance machinability and achieve desired mechanical properties.
SAE 4140 can be hardened by cold working or through heating and quenching. Typically, it is supplied with a hardness range of 18-22 HRC. For further hardening, heat to 840°C – 875°C, soak for 10 – 15 minutes per 25 mm section, and quench in oil, water, or polymer.
Reheat to 550°C – 700°C, hold until temperature is uniform, soak for 1 hour per 25 mm of the section, and cool in still air.
Forge SAE 4140 between 1200°C and 900°C. To achieve a finer grain size, avoid forging below 900°C and ensure slow cooling after forging in oil or water.
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Melting Point | 1416°C | 2580°F |
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Melting Point | 1416°C | 2580°F |
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