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采用MgO坩埚高频真空/加压感应炉在氮气压力0.4~1.0 MPa、温度1 570~1 640℃下,对加压感应熔炼Fe-Cr-V系高氮不锈钢进行了实验研究。结果表明,在30CaO-45Al2O3-25SiO2渣覆盖的情况下,氮在Fe-15Cr-1.0V、Fe-18Cr-1.0V、Fe-18Cr-1.5V和Fe-20Cr-2.0V液态合金中的溶解度分别为0.595%、0.736%、0.776%和1.020%,溶解度与氮分压的关系基本符合Sievert定律。渣对钢液吸氮和铝脱氧都起重要的作用,1 873 K、1.0 MPa氮气氛中,在30CaO-45Al2O3-25SiO2、40CaO-40Al2O3-20SiO2、40CaO-50Al2O3-10SiO2三种不同渣系作用下氮在液态Fe-18Cr-1.5V中的浓度分别是0.776%、0.849%和0.884%。
Fe-Cr-V high-nitrogen stainless steel was melted by pressure induction melting at a nitrogen pressure of 0.4-1.0 MPa and a temperature of 1 570-1 640 ° C using a MgO crucible high-frequency vacuum / pressure induction furnace. The results show that the solubility of nitrogen in the liquid alloys Fe-15Cr-1.0V, Fe-18Cr-1.0V, Fe-18Cr-1.5V and Fe-20Cr-2.0V in the case of 30CaO-45Al2O3- 0.595%, 0.736%, 0.776% and 1.020% respectively. The relationship between solubility and nitrogen partial pressure is basically in accordance with Sievert’s law. Slag plays an important role in nitrogen and aluminum deoxidation in liquid steel. Under the nitrogen atmosphere of 1 873 K and 1.0 MPa, under the action of three different slag systems, such as 30CaO-45Al2O3-25SiO2, 40CaO-40Al2O3-20SiO2 and 40CaO-50Al2O3-10SiO2 The concentrations of nitrogen in liquid Fe-18Cr-1.5V were 0.776%, 0.849% and 0.884%, respectively.