40Mn方坯夹杂物行为研究

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Research on Inclusion Behavior in Continuously Cast Billet for Carbon Structural Steel 40Mn

1. College of Metallurgy and Energy, Hebei United University, Tangshan 063009, Hebei, China;
2. Tangshan Vocational College of Science and Technology, Tangshan 063001, Hebei, China;
3. Technology Department, Tangshan Guofeng Iron and Steel Co., Ltd., Tangshan 063300, Hebei, China

摘要: 针对40Mn钢转炉→吹氩站→连铸的生产工艺流程，系统分析了该流程下铸坯中氧氮含量、显微夹杂和大型夹杂的组成和数量及变化规律。结果表明：稳态坯中氧氮平均含量分别为65×10^-6左右和70×10^-6左右；显微夹杂以MnS夹杂及硅铝酸盐夹杂为主，混浇坯的夹杂物含量为正常坯的2倍；大型夹杂物主要为SiO₂夹杂，其次是SiO₂-Al₂O₃夹杂和SiO₂-Al₂O₃-MnO复合夹杂；非稳态浇注影响了钢的洁净度，应当加强浇铸过程中非稳态的控制。
- 40Mn /
- 混浇坯 /
- 氧 /
- 氮 /
- 夹杂物
Abstract: In view of the converter-argon blowing-continuous casting process for production of carbon structural steel 40Mn,oxygen and nitrogen contents and compositions,amounts and variation of microscopic and macroscopic inclusions in casting blanks were systematically analyzed.The results show that the average contents of oxygen and nitrogen in steadily cast billet are about 65 × 10^-6 and 70 × 10^-6; microscopic inclusions are mainly MnS and aluminosilicate inclusions,and the inclusions in unsteadily cast billet is two times of those in normal blank; major macroscopic inclusion is SiO₂ inclusion,followed by SiO₂-Al₂O₃ and SiO₂-Al₂O₃-MnO inclusions,unsteady casting influences steel cleanliness,unsteady control should be strengthened during casting process.
- 40Mn /
- unsteadily cast billet /
- oxygen /
- nitrogen /
- inclusion