ASTM A331 Grade 4140 Introduce
One of the primary benefits of ASTM A331 steel is its excellent mechanical properties. This grade of steel has a higher tensile strength and yield strength than many other carbon steel alloys, and it is also highly resistant to fatigue and fracture. These properties allow it to hold up to repeated and increased stress levels, making it an ideal material for motor applications. Its high strength and fatigue resistance also makes ASTM A331 steel a great choice for parts that may experience unexpected shock and stress.
Smelting temperature:1988°C - 1366°C
Application:Cold rolled alloy steel rod
ASTM A331 Grade 4140 Material Chemical Composition
The chemical composition of the ASTM A331 Grade 4140 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Molybdenum (Mo) | 0.1500 | 0.2500 |
| Chromium (Cr) | 0.8000 | 1.1000 |
| PhOsphorus (P) | - | 0.0350 |
| Sulfur (S) | - | 0.0400 |
| Manganese (Mn) | 0.7500 | 1.0000 |
| Silicon (Si) | 0.1500 | 0.3500 |
| Carbon (C) | 0.3800 | 0.4300 |
ASTM A331 Grade 4140 Material Mechanical Properties
The mechanical properties of the ASTM A331 Grade 4140 steel are as follows:
| YieldRp0.2 | ≤ 739 (MPa) |
| TeileRm | ≤ 663 (MPa) |
| ImpactKV/Ku | 11(J) |
| ElongationA | 14% |
| Reduction in cross section on fractureZ | 32% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 114 |
ASTM A331 Grade 4140 Material Thermal Properties
The thermal performance parameters of the ASTM A331 Grade 4140 steel are as follows:
| Temperature (°C) | 13 | 983 | 716 |
| Modulus of elasticity (GPa) | - | 912 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 22 |
| Thermal conductivity (W/m·°C) | - | 43.3 | 13.2 |
| Specific thermal capacity (J/kg·°C) | - | 412 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.22 | - | - |
| Deity (kg/dm³) | - | - | 444 |
| Poisson’s coefficient, ν | - | - | 314 |