一种高韧性Q420R压力容器钢板的制备方法
The high-toughness Q420R pressure vessel steel plate preparation method, through precise composition design and process optimization, solves the problems of compositional segregation and insufficient low-temperature toughness in thick steel plates, and realizes the manufacturing of high-strength, low-cost steel plates suitable for pressure-bearing equipment in petrochemical, nuclear power and other fields.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- INNER MONGOLIA BAOTOU STEEL UNION
- Filing Date
- 2026-05-06
- Publication Date
- 2026-07-17
AI Technical Summary
Existing Q420R steel plates are prone to compositional segregation in thicker sizes, have insufficient impact toughness at -40℃, and traditional microalloying designs cannot balance strength and toughness. Poor matching of normalizing process parameters leads to abnormal microstructure and weld embrittlement, and also results in high production costs.
High-toughness Q420R pressure vessel steel plates are prepared by using KR desulfurization process, LF refining, RH vacuum refining, continuous casting and segmented controlled rolling, combined with multi-element microalloying design and precise composition control and process optimization. This includes controlling the composition of molten iron, vacuum refining, electromagnetic stirring, segmented controlled rolling and normalizing treatment.
It achieves high strength, excellent low-temperature toughness, and welding compatibility in 10-60mm steel plates, reduces alloy costs, improves product qualification rate and steel purity, and is suitable for manufacturing pressure vessels under low-temperature and high-pressure conditions.
Smart Images
Figure CN122405945A_ABST