Title:
PRODUCTION OF FERRITIC STAINLESS STEEL WELDED TUBE SATISFACTORY IN WORKABILITY
Document Type and Number:
Japanese Patent JP2000326079
Kind Code:
A
Abstract:
To produce a stainless steel welded tube satisfactory in workability by reducing a hardness difference between a welded part and a base metal part, even after leveling.
A ferritic stainless steel strip containing Ti, Nb of ≤1 wt.% alone or in total is formed into an open tube, butted parts are welded by laser beam. The temp., when a welded tube passes a straightening stand, is controlled to a temp. of 150°C or lower so that a hardness difference ΔHV (=HVW-HVB) between a Vickers hardness HVW of a welded part and a Vickers hardness HVB of a base metal part is in the range of 10-80 and a proof stress of a stock is 80% or higher of the room temp. proof stress.
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Inventors:
ASADA HIROSHI
NAKAKO TAKEFUMI
SAKURADA YASUHIRO
NAKAKO TAKEFUMI
SAKURADA YASUHIRO
Application Number:
JP13977899A
Publication Date:
November 28, 2000
Filing Date:
May 20, 1999
Export Citation:
Assignee:
NISSHIN STEEL CO LTD
International Classes:
B21D3/02; B23K26/21; B23K26/32; C21D8/10; C22C38/00; C22C38/28; B23K101/06; B23K103/02; (IPC1-7): B23K26/00; B21D3/02; C21D8/10; C22C38/00; C22C38/28
Attorney, Agent or Firm:
Wataru Ogura