Title:
PRODUCTION OF SEAMLESS STEEL PIPE
Document Type and Number:
Japanese Patent JP3129064
Kind Code:
B2
Abstract:
PURPOSE: To manufacture a seamless steel pipe by preventing the generation of a flaw on the inner surface of the pipe when piercing and rolling a cast billet cast continuously, using as a billet, and when piercing and rolling a cast billet cast continuously after blooming rolling, using as a billet.
CONSTITUTION: In the manufacture of a seamless steel pipe by piercing and rolling a solid round billet attained by continuously casting, the solid round billet A made so that inner gaps 3 generating at the time of casting, do not exist within the range of 3% of a diameter from the center of a cross section, is used.
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Inventors:
Yutaka Nagase
Application Number:
JP31036893A
Publication Date:
January 29, 2001
Filing Date:
December 10, 1993
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B21B19/04; (IPC1-7): B21B19/04
Domestic Patent References:
| JP1162551A |
Attorney, Agent or Firm:
Mizogami Miyoshi (2 outside)