Ductile and brittle transition of EN10028-3 P460NL2 pressure vessels steel plate

In boilers and pressure vessels, the impact toughness of EN10028-3 P460NL2 pressure vessels steel plate is very good under normal temperature conditions, but once the temperature is lower than a certain critical value, the impact toughness of EN10028-3 P460NL2 pressure vessels steel plate will drop suddenly. The fracture is no longer fibrous, but becomes crystalline, and the fracture also changes from micropore aggregation to transgranular cleavage. As the temperature changes, the yield strength of the material also changes, the temperature decreases, the yield strength increases, and the breaking strength does not change significantly, thereby brittle the material. Studies have shown that the ductile-brittle transition temperature of materials is not constant, but changes with changes in external conditions. The brittle transition temperature is affected by the thickness of the EN10028-3 P460NL2 pressure vessels steel plate. The greater the thickness, the higher the brittle transition temperature. In the GB150 standard, the working temperature of the pressure vessel is in the range of -20 ° C ~ 0 ° C, which is not in line with the standard of low temperature pressure vessels. It is not necessary to use low temperature steel in the production process. If the thickness of EN10028-3 P460NL2 pressure vessels steel plate exceeds a certain temperature value, the brittle transition temperature will rise, which poses a safety hazard for the safe operation of the product.


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