Q235钢中显微夹杂物行为研究
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摘要
系统分析了我国北方某钢厂采用120 t BOF→Ar Blowing→CC工艺生产的Q235钢中氧氮含量、钢中显微夹杂物类型、尺寸、数量及分布的变化历程。结果表明,铸坯中w(T[O])平均为78.6×10~(-6),w([N])平均为52.1×10~(-6),显微夹杂物数量为11.2个/mm~2;显微夹杂物以SiO_2-Al_2O_3-MnO-TiO_2-MnS复合夹杂为主,粒度在2.5~15μm之间,其中0~5μm的夹杂约占25.01%,5~10μm的夹杂约占43.69%,10~15μm的夹杂约占9.47%;显微夹杂物在距内外弧1/3~1/4处含量最高,边部及中心部位夹杂物较少;铸坯中含钢包渣污染物的夹杂占41.2%,含中间包渣污染物的占23.3%。钢包渣、中间包渣对夹杂物的吸附能力明显不足,出钢过程中应加钙铝酸盐基渣洗料对钢包顶渣进行改质,从而降低钢中夹杂物数量。
Content of T[O]、[N] and the type,size,quantity,distribution of microinclusions in Q235 steel produced with 120 t BOF-Ar Blowing-CC process at an iron and steel plant in Northern China have been studied with system.The results showed that the average w(T[O]) in casting billet was 78.6×10~(-6),the average w([N]) was 52.1×10~(-6),and the amount of microinclusions was 11.2 in each square millimeter.The type of micro-inclusions was SiO_2-Al_2O_3-MnOTiO_2-Mn S compound inclusion whose particle size was in the range of 2.5 μm to 15 μm(inclusions of 0-5 μm accounted for about 25.01%,inclusions of 5-10 μm accounted for about 43.69%,inclusions of 10-15 μm accounted for about 9.47%).The amount of micro-inclusions reached its maximum in a quarter to a third of the inner and outer arcs,while less in the edge and center of casting billet.Micro-inclusions of the ladle slag pollutants in slab was accounted for 41.2%,and the tundish slag pollutants was 23.3%.Adsorption capability for inclusions of ladle slag and tundish slag was poor.Calcium aluminate slag washing of material should be put in the ladle slag to enhance the capability.
Content of T[O]、[N] and the type,size,quantity,distribution of microinclusions in Q235 steel produced with 120 t BOF-Ar Blowing-CC process at an iron and steel plant in Northern China have been studied with system.The results showed that the average w(T[O]) in casting billet was 78.6×10~(-6),the average w([N]) was 52.1×10~(-6),and the amount of microinclusions was 11.2 in each square millimeter.The type of micro-inclusions was SiO_2-Al_2O_3-MnOTiO_2-Mn S compound inclusion whose particle size was in the range of 2.5 μm to 15 μm(inclusions of 0-5 μm accounted for about 25.01%,inclusions of 5-10 μm accounted for about 43.69%,inclusions of 10-15 μm accounted for about 9.47%).The amount of micro-inclusions reached its maximum in a quarter to a third of the inner and outer arcs,while less in the edge and center of casting billet.Micro-inclusions of the ladle slag pollutants in slab was accounted for 41.2%,and the tundish slag pollutants was 23.3%.Adsorption capability for inclusions of ladle slag and tundish slag was poor.Calcium aluminate slag washing of material should be put in the ladle slag to enhance the capability.
引文
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[2]王硕明,吕庆,王洪利,等.转炉流程轴承钢连铸坯非金属夹杂物的行为[J].东北大学学报(自然科学版),2006,27(2):192-195.
[3]汪庆国,李京社,唐海燕,等.LD→LF→CC工艺生产82B钢的洁净度研究[J].炼钢,2011,27(6):57-61.
[4]孙立根,任英强,刘阳,等.Q235方坯非金属夹杂物行为研究[J].钢铁钒钛,2015,36(1):85-90.
[5]陈凌峰,赵志毅.杂质元素总量对无取向硅钢中夹杂物的影响[J].上海金属,2016,38(1):51-54.