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在常压和真空条件下研究了温度与氮分压对316L不锈钢中氮溶解度的影响,钢中氮的溶解度随着温度的降低而升高,随着氮分压的增大而增大.建立了316L不锈钢氮溶解度热力学计算模型,不同吹氮条件下氮溶解度实测值与热力学模型计算值较吻合.在1773～1873K条件下,生产控氮型316L不锈钢,氮分压要控制在6～28kPa以上;生产中氮型316L不锈钢,氮分压要控制在22～101kPa以上.常压下吹氮10min,钢液含氮量即可超过0.10%.
The effects of temperature and partial pressure of nitrogen on the solubility of nitrogen in 316L stainless steel were investigated under atmospheric pressure and vacuum conditions. The solubility of nitrogen in steel increased with the decrease of temperature and increased with the increase of nitrogen partial pressure. The nitrogen solubility thermodynamic calculation model of 316L stainless steel is consistent with the nitrogen solubility measured under different conditions of nitrogen blowing, which is in good agreement with the calculated values of the thermodynamic model.The nitrogen-controlled 316L stainless steel is produced under the condition of 1773 ~ 1873K with the nitrogen partial pressure controlled above 6 ~ 28kPa In the production of nitrogen type 316L stainless steel, the partial pressure of nitrogen should be controlled above 22 ~ 101kPa. Nitrogen can be over 0.10% at atmospheric pressure for 10min.