Title:
MANUFACTURE OF HIGH CARBON STEEL SEAMLESS TUBE
Document Type and Number:
Japanese Patent JP3407704
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent a generation of defects on the inside surface without lowering productivity even when a seamless steel tube consisting of high carbon steel is manufactured.
SOLUTION: This method is provided for manufacturing the high carbon steel seamless tube characterized by making the temperature of the billet heating to ≤1,200°C and an average strain rate εAV in the axial direction which is determined by the equation (a) as ≤2.0 sec-1 when the seamless steel tube consisting of the high carbon steel containing, by mass, 0.95-1.10%C is pierce- rolled next to billet heating. εAV=ln(A0/A)/(L/v)...(a), where, A is the cross-sectional area of a hollow tube stock after rolling. A0 is the cross-sectional area of the billet, L is the projected contact length of a material to be rolled with a piercer roll and v is piercing rate.
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Inventors:
Kenichi Shinoki
Shigeru Kidani
Shigeru Kidani
Application Number:
JP31741199A
Publication Date:
May 19, 2003
Filing Date:
November 08, 1999
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B21B1/00; B21B3/00; B21B19/04; C21D8/10; C22C38/00; (IPC1-7): B21B19/04; C21D8/10; C22C38/00
Domestic Patent References:
| JP10180312A | ||||
| JP63281705A | ||||
| JP10505789A |
Attorney, Agent or Firm:
Mikiji Sugioka (2 outside)
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