ASTM A508/A508M Grade 22 Class 7 Introduce
ASTM A508/A508M Grade 22 Class 7 provides a higher strength-to-weight ratio than standard carbon steels. It can easily be welded and is damage-resistant, decreasing the possibility of stress-induced fatigue failure. The addition of vanadium and niobium improves the microstructure and contributes to the steels superior strength and impact properties. The steel is tested for a variety of conditions for mechanical properties, including hardness, toughness, yield strength, tensile strength, microstructure, elongation, impact resistance, and grain size. ASTM A508/A508M Grade 22 Class 7 offers a number of advantages for applications that require high strength, good impact resistance and increased corrosion resistance. It is an economical solution for a variety of applications, making it a great choice for industrial and commercial projects.
Smelting temperature:1675°C - 1179°C
Application:Carbon steel and alloy steel forgings for quenching and tempering vacuum treatment of pressure vessels
ASTM A508/A508M Grade 22 Class 7 Material Mechanical Properties
The mechanical properties of the ASTM A508/A508M Grade 22 Class 7 steel are as follows:
| YieldRp0.2 | ≤ 431 (MPa) |
| TeileRm | ≤ 689 (MPa) |
| ImpactKV/Ku | 34(J) |
| ElongationA | 11% |
| Reduction in cross section on fractureZ | 43% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 412 |
ASTM A508/A508M Grade 22 Class 7 Material Thermal Properties
The thermal performance parameters of the ASTM A508/A508M Grade 22 Class 7 steel are as follows:
| Temperature (°C) | 43 | 798 | 716 |
| Modulus of elasticity (GPa) | - | 368 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 42 |
| Thermal conductivity (W/m·°C) | - | 44.3 | 32.2 |
| Specific thermal capacity (J/kg·°C) | - | 442 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.14 | - | - |
| Deity (kg/dm³) | - | - | 311 |
| Poisson’s coefficient, ν | - | - | 334 |