Title:
TOOL FOR MANUFACTURING SEAMLESS STEEL TUBE
Document Type and Number:
Japanese Patent JP3292122
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a tool for manufacturing seamless steel tubes excellent in durability with which improvement of quality of inner surface and reduction of manufacturing cost of high alloy steel tube manufactured by rolling with a Mannesmann plug mill are enabled.
SOLUTION: This tool is the tool for manufacturing seamless steel tubes by which scaling heat treatment is executed after melting steel and casting into a plug-shaped mold and this steel consists of, by weight, 0.1-0.4% C, 0.1-3% Si, 0.2-2% Mn, 0.05-1% Cu, 0.5-10% Ni, 0.5-5% Cr, 0.5-5% Mo, 0.5-5% W, 0.5-5% Co, 0.015-1% Ti, 0.01-0.1% sol. Al and the balance which satisfies the formula: 0≤Co%×7-C%×10-Ni%≤18, is Fe with inevitable impurities.
Inventors:
Tatsuo Maeda
Yusuke Minami
Tatsuo Takaoka
Motoharu Yamazaki
Yusuke Minami
Tatsuo Takaoka
Motoharu Yamazaki
Application Number:
JP35128097A
Publication Date:
June 17, 2002
Filing Date:
December 19, 1997
Export Citation:
Assignee:
Nippon Steel Tube Co., Ltd.
International Classes:
B21B25/00; B22D25/02; C21D9/00; C22C38/00; C22C38/52; C22C38/58; (IPC1-7): B21B25/00; C22C38/00; C22C38/52; C22C38/58
Domestic Patent References:
| JP9195002A | ||||
| JP4147706A | ||||
| JP63282241A | ||||
| JP4270003A | ||||
| JP56130457A | ||||
| JP60208458A | ||||
| JP59153871A | ||||
| JP599154A | ||||
| JP61264163A |
Attorney, Agent or Firm:
Takehiko Suzue (4 outside)
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