超低碳汽车外板BH钢炼钢过程中夹杂物的演变

潘晓倩, 杨健, 职建军, 王睿之, 范正洁, 徐龙云

钢铁 ›› 2019, Vol. 54 ›› Issue (8) : 48-57.

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钢铁 ›› 2019, Vol. 54 ›› Issue (8) : 48-57. DOI: 10.13228/j.boyuan.issn0449-749x.20190190
炼钢

超低碳汽车外板BH钢炼钢过程中夹杂物的演变

  • 潘晓倩1,杨健1,职建军2,王睿之2,范正洁2,徐龙云1
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Evolution of inclusions in steelmaking process for #br# ultra low carbon BH auto exposed panel

  • 潘晓倩1,杨健1,职建军2,王睿之2,范正洁2,徐龙云1
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摘要

为了研究超低碳钢炼钢过程中夹杂物的具体演变规律,利用夹杂物自动分析系统研究了硫质量分数分别为0.010%和0.015%的两炉次(S100炉次和S150炉次)超低碳汽车外板烘烤硬化钢(bake hardening steel,简称BH钢)从RH终点到铸坯过程中夹杂物形貌、成分、数量、尺寸的演变,并利用X射线荧光光谱仪和X射线衍射仪结合RH精炼渣和中间包覆盖剂熔渣的成分进行对比分析。结果表明,BH钢中夹杂物的主要类型为Al2O3、MnS、Al2O3+MnS和含硅类夹杂物(其中含硅类夹杂物主要是AlSiO夹杂,不包括纯硅、SiC、SiO2)。由于BH钢中锰和硫质量分数较高,凝固过程中MnS大量析出,使得铸坯中MnS夹杂物数量密度和夹杂物总数量密度显著增加。硫质量分数为0.010%和0.015%的两炉次钢在RH和中间包中MnS夹杂物数量密度无明显差异,由于MnS主要在凝固过程中析出,S150炉次在铸坯中的MnS明显多于S100炉次。精炼渣中w((FeO+MnO))较高,w((CaO))/w((Al2O3))比低,会导致RH终点Al2O3夹杂物较多。在浇注过程中,引流砂的流入会导致中间包覆盖剂熔渣中SiO2质量分数增高,造成钢液中SiAlO等夹杂物的数量密度明显增加。结晶器过程中Al2O3夹杂不断聚集长大、上浮去除,使铸坯中Al2O3和Al2O3+MnS夹杂物数量密度减少,尺寸增大。

Abstract

 In order to study the specific evolution of inclusions for ultra low carbon steel in steelmaking process,the inclusions automatic analyze system was used to study the ultralow carbon bake hardening (BH) steel of automobile exposed panel for two heats (S100 and S150) with sulfur mass percent of 0.010% and 0.015%, respectively. The evolution of the morphology,composition,number and size of inclusions from the end point of RH to the slab for two heats was analyzed. The refining slag of RH and tundish flux were also analyzed in the way of Xray fluorescence spectrometer and Xray diffractometer. The results show that the main types of inclusions in BH steel are Al2O3,MnS,Al2O3+MnS and Sicontaining inclusions (Sicontaining inclusions are mainly SiAlO inclusions,excluding pure Si,SiC,SiO2). Because of the high mass percent of Mn and S in BH steel,a large amount of MnS precipitates during solidification,which makes the number density of MnS inclusions and the total number density of inclusions in slab increase significantly. There is no significant difference in the number densities of MnS inclusions in RH and tundish between two heats with the sulfur mass percent of 0.010% and 0.015%. As MnS precipitates mainly in solidification process,the number density of MnS in slab for S150 heat is obviously higher than that for S100 heat. The higher w((FeO+MnO)) in the refining slag and the lower ratio of w((CaO))/w((Al2O3)) lead to more Al2O3 inclusions at the end of RH. In the casting process,the flow of ladle filler sand into tundish flux will lead to the increase of its SiO2 mass percent and the increase of SiAlO inclusions in molten steel. During the mold process,the Al2O3 inclusions aggregate and grow up continuously and are removed by floatation,which reduces the number density of Al2O3 and Al2O3+MnS inclusions and increases the size of the inclusions.

关键词

超低碳BH钢 / 夹杂物 / RH精炼渣 / 中间包覆盖剂熔渣 / 汽车外板

Key words

ultralow carbon BH steel / inclusion / RH refining slag / tundish fIux / auto exposed panel

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潘晓倩, 杨健, 职建军, . 超低碳汽车外板BH钢炼钢过程中夹杂物的演变[J]. 钢铁, 2019, 54(8): 48-57 https://doi.org/10.13228/j.boyuan.issn0449-749x.20190190
PAN Xiaoqian, YANG Jian, ZHI Jianjun, et al. Evolution of inclusions in steelmaking process for #br# ultra low carbon BH auto exposed panel[J]. Iron and Steel, 2019, 54(8): 48-57 https://doi.org/10.13228/j.boyuan.issn0449-749x.20190190

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