By adopting the step-hole forging process to manufacture the cylinder proper forgings,the problem of the sealing interface for the cylindor proper forgings has been successfully solved.

Manufacturing technology of heavy cylinder forgings;

By means of summing up the practical manufacture of two integral forged welded stub and contrasting with other attachment structures and their securities,the applicability of using an integral forged welded stub on coke drum skirt attachment under nowadays construction level was discussed .