Abstract: The variations of the hydrogen storage ability of the enamel steel DC05EK with the annealing temperatures were studied. The effects of the precipitate behaviour on the hydrogen permeation time were studied at different annealing temperatures. The results showed that with the increase of the annealing temperature， the ability of hydrogen storage of the test steel was reduced and the hydrogen permeation time shortened due to the decrease of the amount of smallsized precipitates. When the annealing temperature increased from 730℃ to 850℃， the hydrogen permeation time reduced from 165min to 119min. When the annealing temperature was 870℃， the hydrogen permeation time rapidly reduced to 36min and the hydrogen storage ability was lack， which caused by the dissolve of smallsized precipitates. The optimal continuous annealing temperature for the enamel steel DC05EK is 730~850℃.

Key words: enamel steel, continuous annealing, annealing temperature, precipitates, hydrogen permeation