A533 Grade B boiler Pressure vessel plate has excellent low temperature impact toughness and mechanical properties, and is usually used under low temperature conditions. ASTM A533 boiler vessel plate is widely used in low temperature separation processing, liquefied gas storage and other fields, such as large vacuum low temperature liquefied natural gas (LNG) storage equipment.
All plates shall be heat treated by heating to a suitable temperature within the range from 1550 to 1800°F [845 to 980°C], holding for a sufficient time to obtain uniform temperature throughout the plate thickness and then quenching, in water. Subsequently the plates shall be tempered at a suitable temperature to produce the specified properties, but not less than 1100°F [595°C] with a minimum holding time of 1/2 h/in. [1.2 min/mm] of thickness, but not less than 1/2 h.
A533 Grade B pressure vessel steel Mechanical properties
| Class | Tensile strength Rm MPa | Yield strength ReH MPa min | Elongation A% min 50mm |
| SA533 Type B Class 1 | 550-690 | 345 | 18 |
| SA533 Type B Class 2 | 620-795 | 485 | 16 |
| SA533 Type B Class 3 | 690-860 | 570 | 16 |
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