Title:
MANUFACTURE OF SEAMLESS CLAD METALLIC TUBE
Document Type and Number:
Japanese Patent JP2595856
Kind Code:
B2
Abstract:
PURPOSE: To prevent the generation of a rash flaw on an inner surface in manufacture of a seamless clad metallic tube by hot rolling work of a hollow double tube stock which a metal difficult to be worked is arranged to the inner layer.
CONSTITUTION: The hollow double tube stock 3 which the metal difficult to be worked is arranged to the inner layer is hot rolled into a prescribed size by Mannesmann tube making process. After second piercer rolling succeeding to first piercer rolling or piercer rolling is executed at a hot rolling temp. of ≤1250°C and elongation ratio of ≤1.8 per one rolling, the tube stock is elongating rolled with a mandrel mill. In this way, the seamless clad metallic tube having the inner layer of a high Ni-alloy can be manufactured by Mannesmann tube making process without a rash flaw on the inner surface.
Inventors:
Toru Okazawa
Application Number:
JP4217492A
Publication Date:
April 02, 1997
Filing Date:
January 30, 1992
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B21B19/04; B21B19/06; B23K20/00; (IPC1-7): B21B19/06; B21B19/04; B23K20/00
Other References:
【文献】材料とプロセス、3〔2〕(1990)小寺俊英ら、P.505
Attorney, Agent or Firm:
Yoshihisa Oshida