Abstract: In order to find out hydrogen content change law in ESR ingot during electroslag remelting， and on the basis of each process optimize to improve the electric slag ingot hydrogen content qualified rate ， nuclear power steel 316H is taken as the research object to study processing parameters such as melting speed， filling ratio， slag ingredients， amount of slag added， initial hydrogen of electrode and partial pressure of water vapor by using a 15 ton electroslag furnace in this paper.The results show that hydrogen addition is different in each stage of electroslag remelting，the hydrogen content in ESR ingot is proportional to the square root of water pressure in the air. The CaO can promote hydrogen increase and MgO can prevent hydrogen increase in the slag ingredients. Increasing the melting rate， reducing the amount of slag， increasing the filling ratio and improving the cleanliness of the electrode surface are beneficial to prevent hydrogen of electroslag ingot increase. When the initial hydrogen of the electrode is less than 2×10^-6， the hydrogen absorption of the remelting process of the electroslag is more serious. When the initial hydrogen of the electrode is in the range of 2×10^-6-4×10^-6， the hydrogen absorption of the electroslag remelting process becomes weaker. When the initial hydrogen of the electrode is greater than 4×10^-6， the electroslag remelting process will appear dehydrogenation.After the process optimization， the average qualified rate of hydrogen reaches 97.5%， which is 2.8% higher than 94.7% before the optimization.

Key words: Electroslag Remelting, Hydrogen Content, 316H steel, Hydrogenation, Process Optimization

摘要： 为找出电渣重熔过程中电渣锭氢含量变化规律，并在此基础上，对各工序进行优化以实现电渣锭氢含量合格率提高，以核电用钢316H为研究对象，依托15 t电渣炉对熔炼速度、充填比、渣料成分、渣料加入量、电极初始氢、水蒸气分压相关工艺参数进行了分析研究，结果表明，电渣重熔过程中各阶段增氢不同，电渣锭中的H与空气中水分压的平方根成正比关系；渣料组元中CaO能够促进增氢，MgO能够防止增H；加大熔化速度降低渣量，增加填充比，提高电极表面洁净度有利于防止电渣锭增氢；电极初始w［H］＜2×10^-6时，电渣重熔过程吸H较严重，当电极初始w［H］处于2×10^-6～4×10^-6时，电渣重熔过程吸H变弱，当电极初始w［H］＞4×10^-6时，电渣重熔过程则会出现脱H。经过工艺优化后，H合格率平均达到了97.5%，较工艺优化前的94.7%提高了2.8%。

关键词: 电渣重熔, 氢含量, 316H钢, 增氢, 工艺优化