Title:
HEAT TRANSFER TUBE FOR STEAM GENERATOR AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2012/001882
Kind Code:
A1
Abstract:
Disclosed is a heat transfer tube for a steam generator, wherein the surface roughness of the inner surface of a tube is measured in the longitudinal direction, and the dimensional variability in the measured roughness curve at a 50 mm region is 4 µm or less, and amount of bending in a portion having a length of 1,000 mm from an end of the tube is 1 mm or less, so that an eddy-current inspection can be performed at a high S/N ratio when a tube is produced, and the inspection efficiency can be improved, and furthermore, when the tube is incorporated in a heat exchanger, the incorporation operation can be easily performed. It is preferable that the heat transfer tube for a steam generator is produced by processes including a cold working process wherein a drawing process is performed using a high-pressure lubricant having a pressure of 40 MPa or more, a solution heat treatment process, and a straightening process using a roll straightener. Furthermore, regarding the roll straightener, using a roll straightener wherein at least five pairs of drum-shaped straightening rolls which are vertically opposed to each other and which have rotation axes intersecting each other, is preferable.
Inventors:
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)
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)
Application Number:
JP2011/003194
Publication Date:
January 05, 2012
Filing Date:
June 07, 2011
Export Citation:
Assignee:
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)
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)
International Classes:
F28F1/00; B21C3/10; B21C9/00; B21D3/02; C22C19/05; C22C38/00; C22C38/58; C22F1/10; F28F1/40; F28F21/08; C22F1/00
Attorney, Agent or Firm:
MORI, Michio et al. (M. MORI PATENT OFFICE, 17-23 Higashinaniwa-cho 5-chom, Amagasaki-shi Hyogo 92, 〒6600892, JP)
Claims: