SETT ATT GLODGA ETT FLERTAL INDIVIDUELLA KISELSTALSBESKICKNINGAR I EN TUNNELUGN

摘要

Individual charges of silicon steel are passed through a tunnel type furnace provided with charge and discharge vestibules. The annealing takes place in a hydrogen atmosphere and the vestibules are purged with nitrogen and then with hydrogen. The hydrogen used for purging is taken from the hydrogen in the annealing atmosphere and additional new hydrogen is added to the annealing atmosphere at the same time to maintain the pressure constant.