Necessity of post-weld heat treatment for pressure vessels

The design of pressure vessels is based on the given working conditions and process dimensions, considering the requirements of manufacturing, installation and maintenance, and carrying out load analysis and stress analysis on the correct selection of materials for each component of the pressure vessel. Choose a reasonable structure type, and determine the strength size that is safe, reliable, economical and reasonable. 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 pose a threat to property and personnel safety. Therefore, the long-term safety of the pressure vessel is ensured. Operation is of great significance to the production of process industries such as petrochemicals.

The safety of pressure vessels firstly depends on the selection of materials, and the performance of metal materials is not only related to its 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 rolling state, normalizing state, tempering state, normalizing + high temperature tempering state, quenched and tempered state, solid solution state and stabilized state. The quality of the heat treatment effect of the pressure vessel will directly affect the quality of the product.