MANUFACTURE OF SEAMLESS STEEL TUBE AND SEAMLESS STEEL TUBE HAVING EXCELLENT INNER SURFACE QUALITY

Title:

MANUFACTURE OF SEAMLESS STEEL TUBE AND SEAMLESS STEEL TUBE HAVING EXCELLENT INNER SURFACE QUALITY

Document Type and Number:

Japanese Patent JP3368834

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide a manufacturing method of a seamless steel tube capable of stably obtaining a product tube of 0.2 mm or less in depth of a flaw in an inner surface and the seamless steel tube having excellent inner surface quality which is obtained by the method.
SOLUTION: When thinning is applied to a hollow tube stock after piercing and rolling with a stretch mill which is provided witch an inner surface control tool, the inner surface of the hollow tube stock is purged with inert gas, a lubricant whose main component is univalent alkali metal borate and which does not incorporate phosphorus is uniformly coated at 50-300 g/m2 onto the inner surface of the tube just after that, and thereafter stretch rolling is executed.

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JPS61126913	ROLLING METHOD OF PIPE BY MANDREL MILL
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Inventors:

Tetsuya Nakanishi
Sumio Iida

Application Number:

JP20916398A

Publication Date:

January 20, 2003

Filing Date:

July 24, 1998

Export Citation:

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Assignee:

SUMITOMO METAL INDUSTRIES,LTD.

International Classes:

B21B17/02; B21B25/04; C22C38/00; C22C38/18; (IPC1-7): B21B25/04; B21B17/02; C22C38/00; C22C38/18

Domestic Patent References:

JP5933010A
JP6064720A
JP1278903A
JP6137989A
JP5171165A
JP871619A

Attorney, Agent or Firm:

Morio Mori (1 outside)

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