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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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X80管线钢板中条串状CaO-Al2O3系非金属夹杂物的控制
DOI: 10.3724/SP.J.1037.2012.00505, PP. 553-561
Keywords: X80管线钢,非金属夹杂物,B类夹杂物,二次精炼,钙处理
Abstract:
采用转炉-钢包精炼炉-RH真空精炼-钙处理炼钢工艺生产的X80管线钢板中,条串状B类夹杂物主要为低熔点CaO-Al2O3系,其成因主要为(1)炉外精炼和钙处理后,钢液中存在许多微小CaO-Al2O3系液态夹杂物,连铸过程聚集成较大尺寸夹杂物(10-20μm),轧制过程中变形为大型条串状夹杂物.(2)尺寸较大的夹杂物在钢液钙处理时,外表层转变为高熔点CaO,CaS或CaO-CaS系,但内部仍为低熔点的CaO-Al2O3系,此类夹杂物在钢板轧制时,内部仍能够变形,最终延展为条串状夹杂物.对X80管线钢板B类夹杂物的控制采用新的策略,将控制重点由钢液钙处理后去除低熔点CaO-Al2O3系夹杂物,改为在钙处理前强化去除钢液中夹杂物,尤其是较大尺寸的夹杂物.采取新控制策略后,真空精炼后夹杂物数量大幅度降低,钙处理效果显著提高,钢板中检测到的夹杂物全部为高熔点CaO-CaS系夹杂,B类夹杂物评级由以往低于2.0级降低至0级.
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