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AISI 1340 40Mn2 SMn438 42Mn6 Alloy steel
Chemical Composition
The chemical composition of AISI 1340 alloy steel is outlined in the following table.
| Element | Content (%) |
|---|---|
| Iron, Fe | 97.25-97.87 |
| Manganese, Mn | 1.60-1.90 |
| Carbon, C | 0.380-0.430 |
| Silicon, Si | 0.15-0.35 |
| Sulfur, S | ≤ 0.040 |
| Phosphorous, P | ≤ 0.035 |
The following table shows the physical properties of AISI 1340 alloy steel.
| Properties | Metric | Imperial |
|---|---|---|
| Density (typical for steel) | 7.87 g/cm3 | 0.284 lb/in³ |
The mechanical properties of annealed AISI 1340 alloy steel are displayed in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 703 MPa | 102000 psi |
| Yield strength | 434 MPa | 62900 psi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 80.0 GPa | 11600 ksi |
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson's ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 25.50% | 25.50% |
| Reduction of area | 57.30% | 57.30% |
| Izod Impact | 46.0 J | 33.9 ft-lb |
| Hardness, Brinell | 207 | 207 |
| Hardness, Knoop (converted from Brinell hardness) | 207 | 207 |
| Hardness, Rockwell B (converted from Brinell hardness) | 93 | 93 |
| Hardness, Rockwell C (converted from Brinell hardness) | 15 | 15 |
| Hardness, Vickers (converted from Brinell hardness) | 217 | 217 |
| Machinability (based on 100 machinability for AISI 1212 steel) | 50 | 50 |
The thermal properties of AISI 1340 alloy steel are given in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@20°C/68°F) | 11.5 µm/m°C | 6.39 µin/in°F |
| Thermal conductivity | 51.9 W/mK | 360 BTU in/hr.ft².°F |
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