Why do pressure vessels need to be heat treated after welding?

Why do pressure vessels need to be heat treated after welding? This is determined according to the design requirements of the pressure vessel. Catalyst storage tank

The safety of pressure vessels is first determined by the choice of materials, and the properties of metal materials are not only related to their chemical composition and metallographic structure, but also closely related to the state of heat treatment. Heat treatment is an important process to improve the performance of metal materials and their products. GB150 clearly stipulates the heat treatment state of various pressure vessel steel plates in their use. Such as: hot rolled state, normalized state, tempered state, normalized + high temperature tempered state, quenched and tempered state, solid solution state and stabilized state. The quality of the heat treatment of the pressure vessel will directly affect the quality of the product.

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The design basis of the pressure vessel is the given working conditions and process dimensions, considering the requirements of manufacturing and installation and maintenance, and the correct selection of materials for each component of the pressure vessel to carry out load analysis and stress analysis. Choose a reasonable structure type, and determine the strength size that is safe, reliable, and economical. It usually works continuously for a long time under harsh operating conditions. The failure of a pressure vessel or even the damage of a part often leads to the shutdown of the entire device, which may threaten the safety of property and personnel. Therefore, the long-term safety of the pressure vessel is guaranteed. Operation is of great significance to the production of petrochemical and other process industries.