ASTM A672 Grade J90 Class 2 Type A Introduce
ASTM A672 Grade J90 Class 2 Type A is a high strength, low alloy steel that is used for many applications, including construction, engineering and automotive. It is a versatile material that can be used for both structural and mechanical applications and is known for its superior mechanical properties. Moreover, ASTM A672 Grade J90 Class 2 Type A has a high tensile strength, yield strength, toughness, ductility and stress-rupture strength, which makes it suitable for many applications where dimensional stability and strength are important.
Smelting temperature:1841°C - 1927°C
Application:Medium temperature and high pressure electric welding steel pipe
ASTM A672 Grade J90 Class 2 Type A Material Chemical Composition
The chemical composition of the ASTM A672 Grade J90 Class 2 Type A steel are as follows:
| Element | Min | Max |
|---|---|---|
| Carbon (C) | - | 0.2500 |
| Manganese (Mn) | 1.1500 | 1.5000 |
| PhOsphorus (P) | - | 0.0250 |
| Sulfur (S) | - | 0.0250 |
| Silicon (Si) | 0.1500 | 0.4000 |
| Molybdenum (Mo) | 0.4500 | 0.6000 |
ASTM A672 Grade J90 Class 2 Type A Material Mechanical Properties
The mechanical properties of the ASTM A672 Grade J90 Class 2 Type A steel are as follows:
| YieldRp0.2 | ≤ 968 (MPa) |
| TeileRm | ≤ 626 (MPa) |
| ImpactKV/Ku | 33(J) |
| ElongationA | 14% |
| Reduction in cross section on fractureZ | 12% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 212 |
ASTM A672 Grade J90 Class 2 Type A Material Thermal Properties
The thermal performance parameters of the ASTM A672 Grade J90 Class 2 Type A steel are as follows:
| Temperature (°C) | 34 | 894 | 688 |
| Modulus of elasticity (GPa) | - | 473 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 44 |
| Thermal conductivity (W/m·°C) | - | 44.3 | 32.2 |
| Specific thermal capacity (J/kg·°C) | - | 443 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.34 | - | - |
| Deity (kg/dm³) | - | - | 144 |
| Poisson’s coefficient, ν | - | - | 444 |