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Title:
シームレス鋼管を製造する方法
Document Type and Number:
Japanese Patent JP4169858
Kind Code:
B2
Abstract:
The invention refers to a process for the production of hot-finished tube of carbon, alloyed and high-alloy steels, in particular tubing for antifriction bearings, during which pretreated and degassed as well as deoxidised liquid steel of any circular cross-section but the required chemical composition is continuously cast, separated into charge lengths and, following heating to forming temperature, formed in a pipe mill. The continuously cast bloom being preformed in a 3-roll rotary piercing mill through massive reduction and right afterwards being pierced in a 3-roll rotary piercing mill with axially fixed piercing mandrel in order to form a hollow billet.

Inventors:
Ettore Cernuski
Thomas Risten
Jürgen Peech
Frank Zalomon
Walter Landerad
Gerhard Coolessa
Application Number:
JP5343199A
Publication Date:
October 22, 2008
Filing Date:
March 02, 1999
Export Citation:
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Assignee:
SMS Meer GmbH
International Classes:
B21B19/04; B22D11/00; B21B13/22; B21B19/06; B22D11/12; B21B1/46; B21B3/02
Domestic Patent References:
JP57159204A
JP4041048A
JP5228514A
JP7275908A
Attorney, Agent or Firm:
Shoichi Okuyama
Arihara Koichi
Matsushima Tetsuo



 
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