一种降低非金属夹杂物在厚板坯中聚集的方法
By optimizing the process parameters of converter smelting, LF refining, RH refining and continuous casting, the problem of non-metallic inclusions accumulating in thick slabs was solved, and the quality of the cast slabs and the pass rate of flaw detection were improved.
CN117551843BActive Publication Date: 2026-07-17CHONGQING IRON & STEEL CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHONGQING IRON & STEEL CO LTD
- Filing Date
- 2023-11-16
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
Existing technologies are insufficient to effectively control and reduce the accumulation of non-metallic inclusions in thick slabs, leading to substandard steel plate inspections and affecting the quality of cast billets.
Method used
By controlling process parameters such as steel composition, gas composition and temperature during converter smelting, LF refining, RH refining and continuous casting, combined with alloy addition, gas stirring and protective casting, the generation and aggregation of non-metallic inclusions can be reduced.
Benefits of technology
This significantly improved the quality of the cast billets, increased the pass rate of steel plate flaw detection, and enabled high-quality production of the cast billets.
✦ Generated by Eureka AI based on patent content.
Abstract
本发明涉及一种降低非金属夹杂物在厚板坯中聚集的方法，属于钢铁冶炼技术领域，在RH精炼过程，RH高真空时间≥15min，极限真空度≤73pa，提升气体流量100～150Nm3 / h；RH复压前钢水H≤2ppm，N≤45ppm，O≤20ppm，钢水温度1565～1575℃；RH复压后，钢包开启底吹氩，流量5～20Nm3 / h，喂入钙线130～150m / 炉，15min≥软吹氩≥6min。本发明通过减少钢水钙处理过程的喂钙线量，降低了过程非金属夹杂物二次生成；另外，还通过提高连铸浇注过程恒速，控制钢水在中间包的波动，减少过程非金属夹杂物数量；稳定连铸过程铸坯拉速；适当提高中间包钢水过热度等措施，降低非金属夹杂物在厚板坯中聚集，使得所得铸坯质量钢板探伤合格率明显提高，实践效果理想。
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