ASTM A331 Grade E4340 Introduce
ASTM A331 Grade E4340 is a cold-drawn, low-alloy steel that has a higher yield strength than some other types of steel. The material is also heat-treatable and has excellent weldability, making it suitable for a variety of industrial applications. The steel has a low carbon content range of 0.25-0.30%, making it relatively soft and easy to work with.
Smelting temperature:1177°C - 1656°C
Application:Cold rolled alloy steel rod
ASTM A331 Grade E4340 Material Chemical Composition
The chemical composition of the ASTM A331 Grade E4340 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Molybdenum (Mo) | 0.2000 | 0.3000 |
| Nickel (Ni) | 1.6500 | 2.0000 |
| Chromium (Cr) | 0.7000 | 0.9000 |
| PhOsphorus (P) | - | 0.0250 |
| Sulfur (S) | - | 0.0250 |
| Manganese (Mn) | 0.6500 | 0.8500 |
| Silicon (Si) | 0.1500 | 0.3500 |
| Carbon (C) | 0.3800 | 0.4300 |
ASTM A331 Grade E4340 Material Mechanical Properties
The mechanical properties of the ASTM A331 Grade E4340 steel are as follows:
| YieldRp0.2 | ≤ 141 (MPa) |
| TeileRm | ≤ 451 (MPa) |
| ImpactKV/Ku | 21(J) |
| ElongationA | 11% |
| Reduction in cross section on fractureZ | 34% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 424 |
ASTM A331 Grade E4340 Material Thermal Properties
The thermal performance parameters of the ASTM A331 Grade E4340 steel are as follows:
| Temperature (°C) | 32 | 569 | 565 |
| Modulus of elasticity (GPa) | - | 819 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 41 |
| Thermal conductivity (W/m·°C) | - | 41.3 | 43.2 |
| Specific thermal capacity (J/kg·°C) | - | 313 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.22 | - | - |
| Deity (kg/dm³) | - | - | 341 |
| Poisson’s coefficient, ν | - | - | 334 |