Title:
ELECTRIC RESISTANCE WELDED TUBE EXCELLENT IN LIQUID PRESSURE BULGING FORMABILITY AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3533844
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To produce an electric resistance welded tube excellent in liq. pressure bulging formability required for the stock for automotive structural parts such as parts concerned to automobiles such as suspension arms, frame parts or the like and to provide a method for producing the same.
SOLUTION: This electric resistance welded tube excellent in liq. pressure bulging formability is the one in which a steel strip having a compsn. contg., by weight, 0.01 to 0.1% C, 0.005 to 1.0% Si, 0.2 to 1.6% Mn, 0.01 to 0.08% Al, 0.0006 to 0.006% N and 0.0002 to 0.005% B, satisfying ≤0.015% S, 0.1≤B/N≤2 and ≤0.01% Ti+Nb+V, and the balance substantial iron is used as the stock. Furthermore, the slab having the above compsn. is subjected to hot rolling, after that, its temp. is held at 600 to 720°C fork ≥2sec in the process of runout or, after gradual cooling, it is coiled at 350 to 550°C to form its structure into a structure of ≥80% ferrite, and the balance bainite, and this steel strip is subjected to sizing at 1 to 10% width contraction percentage and is made into a tube.
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Inventors:
Toyoda, Shunsuke
Omura, Masaki
Omura, Masaki
Application Number:
JP24764996A
Publication Date:
May 31, 2004
Filing Date:
September 19, 1996
Export Citation:
Assignee:
NKK CORP
International Classes:
B21C37/08; B23K13/00; C21D9/08; C21D9/46; C22C38/00; C22C38/06; C22C38/14; (IPC1-7): C22C38/00; B21C37/08; C21D9/08; C21D9/46; C22C38/14
Attorney, Agent or Firm:
小林 久夫 （外５名）