Title:
MANUFACTURING METHOD OF SEAMLESS TUBE
Document Type and Number:
Japanese Patent JP3503552
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method of a seamless tube to effectively suppress generation of flaws on an inner surface without generating any defective bite in the Mannesmann pushing and boring method using a material such as free-cutting steel easy to degrade the internal material quality and high alloy steel difficult to work.
SOLUTION: In the manufacturing method of the seamless tube to allow a cast ingot of circular transverse section to bite a skew mill roll and bore it by a boring plug, the skew mill roll is rotated at the peripheral velocity below 4.5 m/second and the back-pressure is applied to the cast ingot by a pusher until the cast slab is stably bitten by the skew mill roll.
Inventors:
Tatsuro Katsumura
Takashi Ariizumi
Shozo Higashi
Takashi Ariizumi
Shozo Higashi
Application Number:
JP34651399A
Publication Date:
March 08, 2004
Filing Date:
December 06, 1999
Export Citation:
Assignee:
JFE Steel Corporation
International Classes:
B21B19/04; C22C38/00; C22C38/50; (IPC1-7): B21B19/04; C22C38/00; C22C38/50
Domestic Patent References:
| JP10180312A | ||||
| JP5950906A | ||||
| JP63220907A | ||||
| JP10175049A | ||||
| JP62282713A | ||||
| JP6218406A |
Attorney, Agent or Firm:
Takehiko Suzue (8 outside)