A method for smelting low-phosphorus steel for continuous casting round billets for gas cylinders
By employing processes such as KR stirring desulfurization, converter full slag blowing, thick slag removal, LF refining, and RH vacuum degassing, combined with pre-melted high-basicity synthetic slag and one-time aluminum supplementation deoxidation, the complexity and stability issues of low-phosphorus steel smelting processes have been resolved, producing high-purity gas cylinder pipe continuous casting round billets.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- QINGDAO SPECIAL STEEL CO LTD
- Filing Date
- 2026-05-29
- Publication Date
- 2026-07-17
AI Technical Summary
Existing low-phosphorus steel smelting processes are complex, costly, and have poor production stability, making it difficult to achieve stable mass production. Furthermore, the purity of molten steel is limited, affecting the corrosion resistance and fatigue performance of gas cylinder pipes.
The process flow adopts KR stirring desulfurization → converter smelting → steel tapping part alloying → post-furnace thick slag and slag removal → LF refining → RH vacuum degassing → continuous casting. By combining full slag retention blowing, thick slag and slag removal, and utilizing pre-melted high basicity synthetic slag and one-time aluminum replenishment for deoxidation, multiple aluminum replenishment is avoided, the alloying process is controlled, and soft blowing argon gas and electromagnetic stirring technology are combined.
Deep dephosphorization and effective phosphorus recovery were achieved, which improved the purity of molten steel and the alloy yield, reduced costs, and produced ultra-low phosphorus and ultra-low sulfur gas cylinder pipe continuous casting round billets that meet the quality requirements of gas cylinder pipes.