Title:
液圧成形性に優れた高強度鋼管
Document Type and Number:
Japanese Patent JP3563988
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a high strength steel tube exhibiting excellent formability in the case of being used for liq. pressure forming. SOLUTION: This steel tube comprises, by mass, 0.05 to 0.3% C, 0.5 to 3.0% Si, 0.5 to 2.5% Mn, and the balance Fe with inevitable impurities, in which the product between tensile strength and elongation by tubular test pieces is >=15,000 [MPa.%], additionally having a retained austenitic phase of >=2.5% by volume, and also, the concn. of C in the retained austenite phase is >=5 times the average value in the whole. Furthermore, the tube contains one or >=two kinds among Cr, Ni, Mo, Cu, Ti and Nb by <=3% in total by mass.
Inventors:
Hiroyuki Tanahashi
Manabu Takahashi
Nobuhiro Fujita
Tatsuo Yokoi
Koji Kishida
Manabu Takahashi
Nobuhiro Fujita
Tatsuo Yokoi
Koji Kishida
Application Number:
JP2392299A
Publication Date:
September 08, 2004
Filing Date:
February 01, 1999
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
B21D26/033; B21D26/037; B21D26/041; B21D26/043; B21D26/053; C22C38/00; C22C38/04; C22C38/58; (IPC1-7): C22C38/00; C22C38/04; C22C38/58
Domestic Patent References:
| JP11279699A | ||||
| JP2000119753A | ||||
| JP2000119754A | ||||
| JP7204734A | ||||
| JP7062485A | ||||
| JP7252584A | ||||
| JP7207405A | ||||
| JP10088278A | ||||
| JP10176220A |
Attorney, Agent or Firm:
Hisataka Tanaka