摘要
结合某特钢厂100 t RH关键工艺设备参数,从脱氢热力学、动力学等角度进行了理论分析和计算。结果显示:在真空度67 Pa时,氢在钢液中的饱和溶解度为0.69×10^-6,按照循环因数取4~5时,计算出真空脱氢时间为8 min;同时,做了RH真空处理前初始氢含量影响因素、极限真空保持时间与脱氢效果等试验,试验表明:在同等入炉原材料条件下,转炉出钢碳含量与氢含量存在一定关系,出钢碳越低,钢水氢含量越低;钢中合金元素含量越高,RH真空处理前初始氢含量越高。极限真空保持时间越长,脱氢效果越好;针对RH真空下脱氢而言,极限真空度保持时间一般不低于15 min,便能将钢中的氢含量脱至1.5×10^-6以内,从而达到较为理想的冶炼效果。
Based on the key process equipment parameters of 100 t RH in a special steel plant,the dehydrogenation thermodynamics and kinetics were analyzed and calculated theoretically.The results show that through thermodynamic calculation,when the vacuum degree was 67 Pa,the saturation solubility of hydrogen in molten steel was 0.69×10^-6;if the cycle factor was 4~5,the vacuum dehydrogenation time was calculated to be 8 min.At the same time,the influence factors of initial hydrogen content before RH vacuum treatment,the limit vacuum holding time and dehydrogenation effect were tested.The results showed that under the condition of the same raw materials into the furnace,there was a certain relationship between the carbon content of steel in the converter and hydrogen content.The higher the content of alloying elements in steel,the higher the content of initial hydrogen before RH vacuum treatment.The longer the ultimate vacuum is maintained,the better the dehydrogenation effect will be.For the dehydrogenation under RH vacuum,the holding time of ultimate vacuum was generally not less than 15min,so the hydrogen content in steel can be removed to within 1.5×10^-6,so as to achieve the ideal smelting effect.
作者
刘建
马玉民
周伟基
季益龙
张彤
陈玉良
Liu Jian;Ma Yumin;Zhou Weiji;Ji Yilong;Zhang Tong;Chen Yuliang(Dongbei Special Steel Group Co.,Ltd;Anhui University of Technology;RHI Refractories(Dalian)Co.,Ltd)
出处
《河南冶金》
2020年第3期8-12,38,共6页
Henan Metallurgy
基金
国家自然科学青年基金(No.51804005)。
关键词
RH
真空脱氢
热力学
动力学
RH
vacuum dehydrogenation
thermodynamics
dynamics
