ASTM A829/A829M E4340 Introduce
ASTM A829/A829M E4340 is a multi-purpose, chromium-molybdenum, medium carbon alloy grade. The alloying elements give the steel exceptional strength and toughness. The chromium addition increases the steel's resistance to corrosion and oxidation, while the molybdenum adds hardness and strength, with the carbon providing additional strength and higher wear resistance. ASTM A829/A829M E4340 has a variety of uses. It is commonly used in automotive and aircraft parts where high strength and wear resistance are required. It is also used for forging and machining operations in applications that require high-strength components. It is also used to manufacture tools and dies that need to stand up to demanding use.
Smelting temperature:1866°C - 1944°C
Application:Structural alloy steel plate
ASTM A829/A829M E4340 Material Chemical Composition
The chemical composition of the ASTM A829/A829M E4340 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.1500 | 0.3500 |
| Sulfur (S) | - | 0.0250 |
| PhOsphorus (P) | - | 0.0250 |
| Nickel (Ni) | 1.6500 | 2.0000 |
| Molybdenum (Mo) | 0.2000 | 0.3000 |
| Manganese (Mn) | 0.6500 | 0.8500 |
| Chromium (Cr) | 0.7000 | 0.9000 |
| Carbon (C) | 0.3800 | 0.4300 |
ASTM A829/A829M E4340 Material Mechanical Properties
The mechanical properties of the ASTM A829/A829M E4340 steel are as follows:
| YieldRp0.2 | ≤ 269 (MPa) |
| TeileRm | ≤ 213 (MPa) |
| ImpactKV/Ku | 33(J) |
| ElongationA | 34% |
| Reduction in cross section on fractureZ | 14% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 332 |
ASTM A829/A829M E4340 Material Thermal Properties
The thermal performance parameters of the ASTM A829/A829M E4340 steel are as follows:
| Temperature (°C) | 11 | 977 | 584 |
| Modulus of elasticity (GPa) | - | 449 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 44 |
| Thermal conductivity (W/m·°C) | - | 13.3 | 33.2 |
| Specific thermal capacity (J/kg·°C) | - | 144 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.11 | - | - |
| Deity (kg/dm³) | - | - | 214 |
| Poisson’s coefficient, ν | - | - | 441 |