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AISI 1040 equivalent to EN8/080M40. An unalloyed medium carbon steel. AISI 1040 is a medium strength steel with good tensile strength. Suitable for shafts, stressed pins, studs, keys etc.
AISI 1040 carbon steel is an EN8 steel equivalent that has high carbon content and can be hardened by heat treatment followed by quenching and tempering to achieve 150 to 250 ksi tensile strength. Specifically, it is equivalent to EN8/080M40. It is a medium-strength steel with adequate tensile strength.
| Element | Content (%) |
|---|---|
| Iron, Fe | 98.6-99 |
| Manganese, Mn | 0.60-0.90 |
| Carbon, C | 0.370-0.440 |
| Sulfur, S | ≤ 0.050 |
| Phosphorous, P | ≤ 0.040 |
| Properties | Metric | Imperial |
|---|---|---|
| Density (chemical composition of 0.435% C, 0.69% Mn, 0.20% Si, annealed at 860°C (1580°F)) | 7.845 g/cc | 0.2834 lb/in³ |
| Melting point | 1521°C | 2770°C |
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 620 MPa | 89900 psi |
| Yield strength | 415 MPa | 60200 psi |
| Bulk modulus (typical for steels) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steels) | 80 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% | 25% |
| Reduction of area | 50% | 50% |
| Hardness, Brinell | 201 | 201 |
| Hardness, Knoop (converted from Brinell hardness) | 223 | 223 |
| Hardness, Rockwell B (converted from Brinell hardness) | 93 | 93 |
| Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) | 13 | 13 |
| Hardness, Vickers (converted from Brinell hardness) | 211 | 211 |
| Izod impact (annealed at 790°C (1450°F)) | 45 J | 33.2 ft-lb |
| Izod impact (as rolled) | 49 J | 36.1 ft-lb |
| Izod impact (normalized at 900°C (1650°F) | 65 J | 47.9 ft-lb |
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@ 20-100°C/68-212°F, composition of 0.40% C, 0.11% Mn, 0.01% P, 0.03% S, 0.03% Si, 0.03% Cu) | 11.3 µm/m°C | 6.28 µin/in°F |
| Thermal conductivity (@ 100°C/212°F) | 50.7 W/mK | 352 BTU in/hr.ft².°F |
| Thermal conductivity (@ 0°C) | 51.9 W/mK | 360 BTU in/hr.ft².°F |
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