Title:
COLD DRAWING METHOD FOR METAL PIPE, AND PROCESS FOR PRODUCTION OF METAL PIPE UTILIZING THE METHOD
Document Type and Number:
WIPO Patent Application WO/2011/158464
Kind Code:
A1
Abstract:
Disclosed is a method for the cold-drawing of a metal pipe, which comprises filling a high-pressure container having a base pipe inserted thereinto with a lubricant oil, increasing the pressure of the lubricant oil by means of a pressure-increasing machine, and drawing the base pipe while lubricating the inner and outer surfaces of the base pipe forcibly, wherein a lubricant oil having a kinematic viscosity of 100 to 2000 mm2/s at 40°C and under ambient pressure and a viscosity-pressure coefficient of 15 to 24 GPa-1 at 40°C is used as the lubricant oil, thereby preventing the burning or vibration which usually occurs during the drawing of the base pipe and also preventing the decrease in roughness degree of the inner surface of the finished metal pipe which is usually caused by the generation of oil pits. In the method, it is preferred that the lubricant oil to be used contains one or more extreme pressure additives independently selected from a sulfur-containing extreme pressure additive, a chlorine-containing extreme pressure additive, an organic calcium metal salt, a phosphorus-containing extreme pressure additive, an organic zinc-containing extreme pressure additive and an organic molybdenum-containing extreme pressure additive each containing a specific component in the total amount of 10 mass% or more.
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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:
JP2011/003199
Publication Date:
December 22, 2011
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:
B21C9/00; C10M131/04; C10M131/12; C10M135/04; C10M135/06; C10M135/20; C10M159/24; C10M171/02; C22C19/05; C22C38/00; C22C38/58; C10N10/04; C10N10/10; C10N10/12; C10N20/00; C10N20/02; C10N30/00; C10N30/06; C10N40/24
Attorney, Agent or Firm:
MORI, Michio et al. (M. MORI PATENT OFFICE, 17-23 Higashinaniwa-cho 5-chom, Amagasaki-shi Hyogo 92, 〒6600892, JP)
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