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使用氧氮分析仪、金相显微分析仪、大样电解法、SEM与EDS等途径,对在转炉加块矿条件下采用KR-BOFAr-CC工艺生产的碳素结构钢Q235B钢的洁净度进行研究。结果表明:从氩站进站到连铸铸坯过程中,钢水中检测到的显微夹杂物数量总体减少,经过氩站吹氩处理后,显微夹杂物平均数量降低了26.63%,表明吹氩效果较明显;在各生产工序过程钢中主要的显微夹杂物为Al2O3和Mn S,其中还包含少量Ca O-Mg O-Al2O3、Ca O-Al2O3与Mg O-Al2O3复合夹杂。在氩站精炼过程中,TO含量降低了19.60×10-6;在浇铸过程中,TO含量增加了10.55×10-6,这是由钢水发生二次氧化或卷渣引起的。从转炉到铸坯过程中,平均氮含量呈递增趋势,在转炉终点到氩站出站过程中增氮最为严重。主要的大型夹杂物为Si O2,还有少量的Mg O-Al2O3-Si O2。
The cleanliness of carbon structural steel Q235B steel produced by KR-BOFAr-CC process was studied using oxygen-nitrogen analyzer, metallographic microscope analyzer, bulk electrolysis, SEM and EDS. . The results show that the number of microscopic inclusions detected in the molten steel decreases from the stop of argon station to the continuous casting slab, and the average number of micro-inclusions decreases by 26.63% after argon argon station treatment, indicating that the blow Argon effect is more obvious. The main microscopic inclusions in the steel during the production process are Al2O3 and MnS, which also contain a small amount of CaO-MgO-Al2O3, CaO-Al2O3 and MgO-Al2O3 composite inclusions. In the argon station refining process, TO content decreased 19.60 × 10-6; in the casting process, TO content increased by 10.55 × 10-6, which is caused by secondary oxidation of molten steel or entrainment. From the converter to the casting process, the average nitrogen content showed an increasing trend in the converter to the argon station when the station out to the most serious nitrogen. The major large inclusions are Si O2 and a small amount of Mg O-Al2O3-Si O2.