BASE TUBE FOR COLD-DRAWING, MANUFACTURING METHOD FOR SAME, AND MANUFACTURING METHOD FOR COLD-DRAWN TUBE

WIPO Patent Application WO/2011/077650

A1

Disclosed are: a base tube for cold-drawing which can be used in the manufacturing of small diameter, elongated tubes such as heat transfer tubes for use in steam generators in nuclear power facilities, and which does not cause sticking or chatter vibrations during the drawing process; a manufacturing method for the base tube; and a manufacturing method for a cold-drawn tube which is acquired by cold-drawing the base tube. The average surface roughness (Ra) (ANSI B46.1) of the internal surface of a base tube for cold-drawing which is used in an oil-lubricated drawing process before being drawn satisfies the condition: 0.10μm≤Ra≤1.00μm. The average surface roughness (Ra) of a base tube which is used in a high-pressure oil-lubricated drawing process and which is made from an austenitic alloy used particularly in heat transfer tubes for use in steam generators satisfies the condition: 0.10μm≤Ra≤0.50μm.

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TOYODA, Masatoshi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
豊田　仁寿 (〒41 大阪府大阪市中央区北浜四丁目５番３３号住友金属工業株式会社内 Osaka, 〒5410041, JP)

JP2010/007129

June 30, 2011

December 08, 2010

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SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 Osaka, 〒5410041, JP)
TOYODA, Masatoshi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)

B21C9/00; B21C1/24; B24C1/06

MORI, Michio et al. (M. MORI PATENT OFFICE, 17-23 Higashinaniwa-cho 5-chome, Amagasaki-sh, Hyogo 92, 〒6600892, JP)

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