【摘要】 研究了钛稳定化不锈钢冶炼过程中夹杂物的形成和变化,分析了钢中Al、Ca、Ti和二次氧化对夹杂物的影响。结果表明,321不锈钢中主要存在CaO·TiO2MgO·Al2O3双相夹杂物和TiN夹杂物。喂钛线前钢中主要有CaOSiO2Al2O3、CaOSiO2等夹杂物,喂钛线后与钛转变为CaO·TiO2MgO·Al2O3。不加Al和CaSi脱氧,或者用CaSi脱氧后,通过喂钛线前的吹氩弱搅拌,尽可能排除钢中含CaO的夹杂物,可显著降低喂钛线后CaO·TiO2MgO·Al2O3夹杂物的数量。控制钢液二次氧化可避免形成新的CaO·TiO2MgO·Al2O3夹杂物。降低铝的质量分数,可减少形成含MgO·Al2O3芯的TiN数量。浇铸过程存在二次氧化时,部分TiN会氧化成TiOx。更多还原

【Abstract】 The types and evolution of the inclusions in Ti stabilized (321) stainless steel during steelmaking and casting were investigated. The effect of Al, Ca and Ti as well as reoxidization on the inclusions was analyzed. The results showed that there are two kinds of inclusions, namely, CaO·TiO2-MgO·Al2O3 as dual-phase inclusion and TiN. After Ti wire feeding SiO2 in, CaO-SiO2 and CaO-SiO2-Al2O3 is reduced by Ti, and CaO·TiO2-MgO·Al2O3 is formed. CaO·TiO2-MgO·Al2O3 inclusions can be reduced sharply either by Ar soft stirring after adding Ca-Si alloy or deoxidation without Al and Ca-Si alloy. The formation of CaO·TiO2-MgO·Al2O3 inclusions can be prevented by avoiding reoxidization of molten steel. The amount of TiN containing MgO·Al2O3 core can be decreased by lowering Al in liquid steel. A few of TiN can be oxidized to TiOx when the molten steel is reoxidized during casting.更多还原