公开(公告)号：US5060496A

公开(公告)日：1991-10-29

申请号：US401413

申请日：1989-09-01

Applicant: Karl Reiter ,  Nobert Kock ,  Rainer Wahn

Inventor： Karl Reiter ,  Nobert Kock ,  Rainer Wahn

IPC: B21D7/16 ,  B21D9/18 ,  C21D9/08

CPC classification number: B21D9/18 ,  B21D7/162 ,  C21D9/08

Abstract: A procedure for producing coil-forming tubes, in which the tubes are heated to a temperature of 1,000.degree.-1,100.degree. C., particularly to 1,050.degree. C. and then bent at temperatures of more than 850.degree. C. The method proceeds in such a way that the tubes are flushed with N.sub.2 or an N.sub.2 atmosphere is maintained during the heating and during the bending process, in order to increase the service life of such tubes.

Abstract translation: 将管子加热至1000℃-1100℃，特别是1050℃的温度，然后在大于850℃的温度下弯曲的方法进行。 在加热和弯曲过程期间，保持管子用N2或N2气氛冲洗的方式，以增加这种管子的使用寿命。