ASTM A672 Grade J90 Introduce
ASTM A672 Grade J90 is a low-carbon, manganese-molybdenum-chromium-silicon alloy steel that is used primarily for structural applications such as pressure vessels and pipes. It has excellent tensile strength and toughness, and is suitable for applications that require high strength and durability. The chemical composition of ASTM A672 Grade J90 gives it certain characteristics that make it ideal for the aforementioned applications. Due to its low carbon content, ASTM A672 Grade J90 has excellent corrosion resistance. The chromium, molybdenum, and silicon in the steel help to prevent corrosion and pitting.
Smelting temperature:1984°C - 1451°C
Application:Medium temperature and high pressure electric welding steel pipe
ASTM A672 Grade J90 Material Chemical Composition
The chemical composition of the ASTM A672 Grade J90 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.1300 | 0.4500 |
| Sulfur (S) | - | 0.0250 |
| PhOsphorus (P) | - | 0.0250 |
| Molybdenum (Mo) | 0.4100 | 0.6400 |
| Manganese (Mn) | 1.0700 | 1.6200 |
| Carbon (C) | - | 0.2500 |
ASTM A672 Grade J90 Material Mechanical Properties
The mechanical properties of the ASTM A672 Grade J90 steel are as follows:
| YieldRp0.2 | ≤ 788 (MPa) |
| TeileRm | ≤ 583 (MPa) |
| ImpactKV/Ku | 24(J) |
| ElongationA | 22% |
| Reduction in cross section on fractureZ | 23% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 342 |
ASTM A672 Grade J90 Material Thermal Properties
The thermal performance parameters of the ASTM A672 Grade J90 steel are as follows:
| Temperature (°C) | 24 | 662 | 712 |
| Modulus of elasticity (GPa) | - | 897 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 12 |
| Thermal conductivity (W/m·°C) | - | 22.3 | 43.2 |
| Specific thermal capacity (J/kg·°C) | - | 412 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.42 | - | - |
| Deity (kg/dm³) | - | - | 444 |
| Poisson’s coefficient, ν | - | - | 322 |