【発明の名称】プラグ耐用度に優れた継目無鋼管の製造方法

Title:

【発明の名称】プラグ耐用度に優れた継目無鋼管の製造方法

Document Type and Number:

Japanese Patent JP2900804

Kind Code:

B2

Abstract:

A seamless steel tubular product is produced by hot-piercing an alloy-steel billet with a piercing plug to produce a hollow shell and then rolling the hollow shell. Prior to the hot-piercing, a steel sheet is joined to an end surface of the billet into which the plug is to be driven, such that the steel plate may not project beyond the periphery of the billet, the steel plate having a surface area (C) satisfying the equation:

where, S is represented (plug bottom radius)<2> x 3.14 . all

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Inventors:

KATSUMURA TATSURO
MINAMI JUSUKE
YASUKAWA MASAHIKO

Application Number:

JP27846094A

Publication Date:

June 02, 1999

Filing Date:

October 18, 1994

Export Citation:

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Assignee:

NIPPON KOKAN KK

International Classes:

B21B15/00; B21B19/04; B21B25/04; B21B45/00; B21B3/02; B21B17/08; (IPC1-7): B21B19/04; B21B25/04

Attorney, Agent or Firm:

Yasuo Ishikawa

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