SA662GrA steel plate is a carbon-manganese-silicon steel plate for medium and low-temperature pressure vessels. It is a killed steel, featuring high-quality properties such as high strength, high toughness, fatigue resistance, impact resistance and wear resistance. It is mainly used to manufacture low-temperature welded pressure vessels operating at -40°C, including equipment and components like reactors, heat exchangers, separators, spherical tanks, oil and gas tanks, liquefied gas tanks, pressure vessels of nuclear reactors and boiler drums.
ASME SA-662 Grade A ASME SA-662/SA-662M Chemical element
Carbon, Silicon, Manganese, Phosphorus, Sulfur are called "Five Elements". They are the main impurities in steel. Carbon improves steel hardness. Silicon strengthens the steel strength. Manganese contributes to increase the steel firmness, strength and wear resistance. Phosphorus reduces the steel plasticity and toughness and appearing cold brittleness. Meanwhile, It can significantly increase the strength of steel, and improve the atmospheric corrosion stability. Sulfur makes the hot brittleness of steel high.
| Element | Min | Max | Similar |
|---|---|---|---|
| Si | 0.1300 | 0.4500 | - |
| S | - | 0.0350 | - |
| P | - | 0.0350 | - |
| Mn | 0.8400 | 1.4600 | - |
| C | - | 0.1700 | - |
ASME SA-662 Grade A ASME SA-662/SA-662M Mechanical properties
| 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) |
|---|---|---|---|---|---|---|
| 687 (≥) | 876 (≥) | 12 | 23 | 24 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 414 |
ASME SA-662 Grade A ASME SA-662/SA-662M Physical properties
The following lists give ASME SA-662 Grade A ASME SA-662/SA-662M properties such as physical properties, density, thermal expansion.
| 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 |
|---|---|---|---|---|---|---|---|
| 12 | - | - | 0.32 | - | |||
| 654 | 236 | - | 42.3 | 134 | - | ||
| 215 | - | 34 | 41.2 | 233 | 431 |
SA662 Gr.A is a typical steel for low-temperature pressure vessels in the ASME system, and its advantages are as follows:
- Good low-temperature toughness at -45℃
- Excellent welding and processing performance
- Mature American standard material system
It is particularly suitable for the manufacture of low-temperature pressure vessels requiring ASME certification. Special attention should be paid during use:
- Normalizing treatment must be carried out when the thickness is >25 mm
- Strictly control the welding heat input
- Well conduct the low-temperature impact test for verification
Used in nuclear power pressure vessel cylinders and steam generators, complying with SA662 Gr.A and ASME standards. If you need to confirm neutron radiation resistance, alloy element content, or obtain the delivery cycle for large-thickness (100-150mm) plates, send an inquiry to get a technical white paper.
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