METHOD AND EQUIPMENT FOR MANUFACTURING SEAMLESS STEEL TUBE EXCELLENT IN SURFACE PROPERTY

Title:

METHOD AND EQUIPMENT FOR MANUFACTURING SEAMLESS STEEL TUBE EXCELLENT IN SURFACE PROPERTY

Document Type and Number:

Japanese Patent JP3307294

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide the method and device for manufacturing a seamless steel tube made of an Fe-base alloy whose Cr content is <15 wt.%, which are immediately applicable to existing manufacturing equipment by which a product steel tube reduced in spock marks due to the partial peeling of oxidized scale and indentation caused remarkably in the case the temp. on the outlet side of a sizing/finishing mill is over 900°C in the steel tube, excellent in the surface properties and good in outward appearance is obtained.
SOLUTION: By arranging high-pressure water type descalers 6a, 6b in the end part of a transporting route provided continuing to the outlet table of the sizing/finishing mill such as a sizer 2 and stretch reducer and, after executing outside descaling process to the steel tube just after sizing/finish rolling, by feeding the steel tube to a cooling bed 3 and on-line heat treating device 4, the thickness of oxidized scale on the outside surface of the steel tube at the point of time when the steel tube reaches the inlet side of a rotary straightener 5 is adjusted to ≤50 μm and rolling for straightening bend is executed under this state.

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Inventors:

Tetsuya Nakanishi
Hozumi Sekiya
Yutaka Nagase

Application Number:

JP26124097A

Publication Date:

July 24, 2002

Filing Date:

September 26, 1997

Export Citation:

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Assignee:

SUMITOMO METAL INDUSTRIES,LTD.

International Classes:

B21B19/04; B21B23/00; B21B45/08; B21D3/02; C21D1/76; C21D1/82; C21D8/10; C21D9/08; C22C38/00; C22C38/18; (IPC1-7): B21B23/00; B21B45/08; B21D3/02; C21D1/76; C21D1/82; C21D8/10; C21D9/08

Domestic Patent References:

JP8117814A
JP718332A
JP10128412A
JP5269507A
JP60255927A

Attorney, Agent or Firm:

Morio Mori (1 outside)

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