Title:
ハイドロフォーミング性に優れ、歪み時効性を有する構造用電縫鋼管
Document Type and Number:
Japanese Patent JP4474731
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an electric resistance welded steel tube excellent in formability at hydroforming and having strain aging characteristic. SOLUTION: A hot rolled or cold rolled hoop stock, which has a composition consisting of 0.01-<0.05% C, <=1.0% Si, <=3.0% Mn, <=0.15% P, <=0.015% S, <=0.04% Al, 0.005-0.02% (and >=0.003% in a state of solid solution) of N and the balance Fe with inevitable impurities and containing, if necessary, at least one kind selected from 0.005-0.040% Nb, 0.005-0.50% Ti, 0.005-0.020% B, 0.02-1.5% Cu, 0.02-1.0% Ni, 0.02-1.0% Cr, 0.02-1.0% Mo, 0.0020-0.02% Ca and 0.0020-0.02% REM, is formed into cylindrical shape and the resultant seam is subjected to electric resistance welding, followed by sizing at 0.3-10% drawing rate of outer peripheral length.
Inventors:
Akio Toyoda
Yuji Hashimoto
Yuji Hashimoto
Application Number:
JP2000127077A
Publication Date:
June 09, 2010
Filing Date:
April 27, 2000
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C22C38/00; B21D26/033; B21D26/041; B21D26/043; B21D26/053; C21D7/02; C21D8/10; C22C38/06; C22C38/58
Domestic Patent References:
| JP11246960A | ||||
| JP11080889A | ||||
| JP2034213A | ||||
| JP8283852A | ||||
| JP10072640A | ||||
| JP11080886A | ||||
| JP11061253A |
Attorney, Agent or Firm:
Junzo Ogawa
Morio Nakamura
Morio Nakamura