ASTM A387 Gr22 Structural Steel Plate
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ASTM A387 Grade 22 Class 2 ASTM A387/A387M is a high-temperature and corrosion-resistant steel alloy composed of chrome molybdenum. With a tensile strength of 90 ksi (620 MPa) and heat-treating temperatures reaching 1202-1350°F (650-732°C), the alloy is ideal for a variety of pressure-containing applications exposed to elevated temperatures. In addition to its exceptional strength, ASTM A387 Grade 22 Class 2 ASTM A387/A387M steel is also highly resistant to corrosion and other damaging effects that can be experienced in extreme scenarios. It is for these reasons that the alloy is popularly used in engine components, power generation, construction and oil and gas applications.
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ASTM A387 Grade 22 Class 2 ASTM A387/A387M Chemical Element
The alloy is also highly corrosion-resistant thanks to the chromium content of 0.5-9%. When exposed to high temperatures and corrosive chemical environments, the alloy maintains a high-level of performance.
Carbon, Silicon, Manganese, Phosphorus, Sulfur are the main basic elements in ASTM A387 Grade 22 Class 2 ASTM A387/A387M.
Carbon is the most important hardening element in steel.
Silicon helps to strengthen the strength. Like manganese, silicon is used to maintain the strength of steel during steel production.
Manganese is the important austenite stabilizing elements contribute to the formation of texture structure and increase the firmness, strength and wear resistance.
Phosphorus is a harmful element. Reducing the plasticity and toughness of steel and appearing cold brittleness. It can significantly increase the strength of steel, and improve the atmospheric corrosion stability. The content should be limited to less than 0.05%.
Usually sulfur is a harmful element, which makes the hot brittleness of steel high, and the content of sulfur is limited to less than 0.05%.
| Element | Min | Max | Similar |
|---|---|---|---|
| Mo | 0.9000 | 1.1000 | - |
| Cr | 2.0000 | 2.5000 | - |
| P | - | 0.0350 | - |
| S | - | 0.0350 | - |
| Mn | 0.3000 | 0.6000 | - |
| Si | - | 0.5000 | - |
| C | 0.0500 | 0.1500 | - |
| S | - | 0.0250 | - |
| P | - | 0.0250 | - |
| Mo | 0.8500 | 1.1500 | - |
| Mn | 0.2500 | 0.6600 | - |
| Cr | 1.8800 | 2.6200 | - |
| C | 0.0400 | 0.1500 | - |
ASTM A387 Grade 22 Class 2 ASTM A387/A387M Mechanical Properties
Introduction of mechanical properties ASTM A387 Grade 22 Class 2 ASTM A387/A387M:
Yield point(σs)When the stress of ASTM A387 Grade 22 Class 2 ASTM A387/A387M or specimen exceeds the elastic limit in tension, even if the stress does not increase, the ASTM A387 Grade 22 Class 2 ASTM A387/A387M or specimen will continue to undergo obvious plastic deformation. This phenomenon is called yielding, and the minimum stress value when yielding occurs is called yield point.
Tensile Strength(σb) : The maximum stress of ASTM A387 Grade 22 Class 2 ASTM A387/A387M during tension from the beginning to the time of fracture. It indicates the ability of ASTM A387 Grade 22 Class 2 ASTM A387/A387M to resist fracture.
Elongation(δs) : The percentage of the plastic elongation length to the original sample length is called elongation.
Yield-strength ratio(σs/σb) : The ratio of yield point (yield strength) to tensile strength of ASTM A387 Grade 22 Class 2 ASTM A387/A387M is called its yield strength ratio. The greater the yield-strength ratio, the higher the reliability of structural parts.
Hardness: Hardness is the ability of ASTM A387 Grade 22 Class 2 ASTM A387/A387M to resist hard objects pressing into its surface. The higher the hardness, the better the wear resistance.
| Yield Rp0.2 (MPa) |
Tensile Rm (MPa) |
Impact KV/Ku (J) |
Elongation A (%) |
Reduction in cross section on fracture Z (%) |
As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 587 (≥) | 653 (≥) | 23 | 44 | 14 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 341 |
ASTM A387 Grade 22 Class 2 ASTM A387/A387M Physical Properties
The ASTM A387 Grade 22 Class 2 ASTM A387/A387M material physical properties shall comply with the values given in the following table.
| Temperature (°C) |
Modulus of elasticity (GPa) |
Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and | Thermal conductivity (W/m·°C) |
Specific thermal capacity (J/kg·°C) |
Specific electrical resistivity (Ω mm²/m) |
Density (kg/dm³) |
Poisson's coefficient, ν |
|---|---|---|---|---|---|---|---|
| 43 | - | - | 0.31 | - | |||
| 199 | 487 | - | 11.3 | 124 | - | ||
| 667 | - | 43 | 32.2 | 142 | 324 |
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