High-formability thin walled ERW pipe for Automobile, Produced by CBR forming mill

摘要

Applications of stainless steel and aluminum to automotive partsfor lighter weight and higher durability have been increasing. In particular, torespond to tendency of using stainless steel for automotive exhaust pipes,Kawasaki steel has developed a new forming process and a mill. This mill wastermed CBR (chance-free bulge roll) forming mill that adopts a new design of aroll flower pattern. High quality ERW stainless steel pipe, which has excellentformability and high quality of welded seam, has been satisfactorily produced bythis mill. These high performances were accomplished by small strain forming ofa strip sheet, a gas shielding technique of electric resistance welding and a newroll forming process without lubrication. Furthermore, the stable production ofultra thin walled stainless steel pipes such as those of wall-thickness of 0.6mmhas also been achieved.