Title:
継目無金属管用丸ビレット及び継目無金属管の製造方法
Document Type and Number:
Japanese Patent JP5459347
Kind Code:
B2
Abstract:
Provided is a round billet capable of reducing damage on a piercing plug in a method of producing a seamless metal tube with a Mannesmann process. The round billet (5), for use in a seamless metal tube, to be produced into a seamless metal tube with a Mannesmann process includes a body having a hole (6) formed in an axial direction of the body. The hole (6) includes an aperture (6a) opening at least at one end face of the round billet (5), and a tapered portion (61) continued to the aperture (6a) and having a diameter gradually increasing toward the aperture (6a).
Inventors:
Fujiwara
Application Number:
JP2012094793A
Publication Date:
April 02, 2014
Filing Date:
April 18, 2012
Export Citation:
Assignee:
Nippon Steel & Sumitomo Metal Corporation
International Classes:
B21B19/04; B21B19/06
Domestic Patent References:
| JP2011121095A | ||||
| JP2010125494A | ||||
| JP1043802A | ||||
| JP45009055B1 |
Foreign References:
| FR1142490A |
Attorney, Agent or Firm:
Hidetoshi Ueba
Takao Matsuyama
Go Sakane
Kawakami Keiko
Tadashi Takezoe
Takao Matsuyama
Go Sakane
Kawakami Keiko
Tadashi Takezoe
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