RADIANT TUBE AND ITS MANUFACTURE THEREOF

摘要

PURPOSE:To enable an anti-oxidization of a radiant tube to be increased without using any expensive metal. CONSTITUTION:(1) An alloy melted and injected layer 1 having a film thickness of about 10 to 250mum is formed at an inner surface of a radiant tube R used in reducing gas atmosphere of high temperature. (2) The alloy melted and injected film 1 having as its major substances Co or Ni or Co and Ni is formed at an inner surface of a range of length of 2/3 of a full length of the radiant tube R or a limited portion within the range. (3) The alloy melted and injected film 1 having as its major substances of Co or Ni or Co and Ni and added with a predetermined amount of Cr, Al and Y is formed at an inner surface of a range of 2/3 of a full length from the burner in a length direction of the radiant tube at (2) above or at the limited portion of the range.