Steel material and pressure vessel
By controlling the specific chemical composition and microstructure of the steel, the problem of balancing low-temperature toughness and high strength in pressure vessels before and after post-weld heat treatment has been solved. This has resulted in high strength and good toughness in low-temperature environments, making it suitable for steel and pressure vessels used in low-temperature applications.
Patent Information
- Application Number
- CN202480065177.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-10-11
- Filing Date
- 2024-10-11
- Publication Date
- 2026-05-26
AI Technical Summary
The steel used in existing cryogenic pressure vessels cannot achieve both high strength and good low-temperature toughness before and after heat treatment following welding, especially with the toughness requirements being further increased in low-temperature environments.
Steel with a specific chemical composition, including elements such as C, Si, Mn, and Ni, is used. The range of α and β values is controlled, and the microstructure is adjusted to ensure that the area ratio of lower bainite and martensite reaches more than 15.0%, totaling more than 90.0%, with an average crystal grain size of less than 20.0 μm. Appropriate heat treatment is then performed to improve toughness.
It achieves high tensile strength and good low-temperature toughness in the range of -10 to -100℃, and is suitable for steel and pressure vessels used in low-temperature applications. It can maintain excellent low-temperature performance before and after welding.