4340 High Tensile Steel Rods
AISI 4340 steel (UNS G43400) is an ultra-high-strength medium-carbon low-alloy steel that combines deep hardenability, high ductility, toughness and strength, and has high fatigue resistance and creep resistance. It is not affected by tempering and embrittlement, shows good strength retention at high temperatures, and is not easy to soften. In thin sections, this steel is air hardened. In practice, it is usually oil quenched.
4340 round bar chemical composition
| Element | Content (%) |
|---|---|
| Iron, Fe | 95.195 - 96.33 |
| Nickel, Ni | 1.65 - 2.00 |
| Chromium, Cr | 0.700 - 0.900 |
| Manganese, Mn | 0.600 - 0.800 |
| Carbon, C | 0.370 - 0.430 |
| Molybdenum, Mo | 0.200 - 0.300 |
| Silicon, Si | 0.150 - 0.300 |
| Sulfur, S | 0.0400 |
| Phosphorous, P | 0.0350 |
4340 mild steel round bar mechanical property
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 745 MPa | 108000 psi |
| Yield strength | 470 MPa | 68200 psi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 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 | 22% | 22% |
| Reduction of area | 50% | 50% |
| Hardness, Brinell | 217 | 217 |
| Hardness, Knoop (converted from Brinell hardness) | 240 | 240 |
| Hardness, Rockwell B (converted from Brinell hardness) | 95 | 95 |
| Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) | 17 | 17 |
| Hardness, Vickers (converted from Brinell hardness) | 228 | 228 |
| Machinability (annealed and cold drawn. Based on 100 machinability for AISI 1212 steel.) | 50 | 50 |
4340 carbon steel round bar physical properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm3 | 0.284 lb/in³ |
| Melting point | 1427°C | 2600°F |
4340 carbon round bar Products Details
4340 carbon steel rod is usually used in places with harsh conditions and heavy parts requiring high strength. It can be widely used as billets, bars, bars, forgings, plates, pipes and welding wires. AISI 4340 mild steel round can also be produced as lightweight plates and castings. Typical applications include bolts, screws and other fasteners. Gears, pinions, shafts and similar mechanical parts; engine crankshafts and piston rods; and aircraft landing gear and other critical structural components.
4340 carbon steel round product image
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