ASTM A829/A829M 4340 Introduce
ASTM A829/A829M 4340 (Alloy Structural Steel Plates) is one of the most used alloy grades in the construction and engineering industries. It is also used in the automotive and aerospace industries in applications such as aircraft frames, suspension components, and transmission components. Drawing on its combination of high strength, toughness, and excellent weldability, ASTM A829/A829M 4340 is a preferred grade in many engineering applications.
Smelting temperature:1674°C - 1559°C
Application:Structural alloy steel plate
ASTM A829/A829M 4340 Material Mechanical Properties
The mechanical properties of the ASTM A829/A829M 4340 steel are as follows:
| YieldRp0.2 | ≤ 555 (MPa) |
| TeileRm | ≤ 679 (MPa) |
| ImpactKV/Ku | 11(J) |
| ElongationA | 12% |
| Reduction in cross section on fractureZ | 11% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 423 |
ASTM A829/A829M 4340 Material Thermal Properties
The thermal performance parameters of the ASTM A829/A829M 4340 steel are as follows:
| Temperature (°C) | 14 | 397 | 291 |
| Modulus of elasticity (GPa) | - | 395 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 22 |
| Thermal conductivity (W/m·°C) | - | 23.3 | 32.2 |
| Specific thermal capacity (J/kg·°C) | - | 124 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.13 | - | - |
| Deity (kg/dm³) | - | - | 122 |
| Poisson’s coefficient, ν | - | - | 142 |