Abstract: This paper deals with the theoretical basis and calculating method of hydrogen removal process from large forgings. Hobsen's calculating method was revised and complemented. We consider that the calculations of hydrogen removal effects in hot-working processes must be done in accordance with the hydrogen content of steel and hydrogen distribution character in large forgings. It was found that the calculating results comformed to actual situation pretty well when the revised calculating method was widely tried out in industry. It can be used in the production process of large forgings.

Key words: 大锻件, 计算方法, 扩散, 氢