Lubricant film-forming composition and screw joint for steel pipe
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United States of America Patent
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Aug 8, 2017
Grant Date -
Jul 21, 2016
app pub date -
Sep 2, 2014
filing date -
Sep 2, 2013
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Abstract
A lubricant film-forming composition includes as a composition: 40 to 80 mass % of a base oil consisting of one or more selected from pentaerythritol fatty acid ester and trimethylolpropane fatty acid ester; 5 to 20 mass % of a solidifying agent consisting of paraffin wax; and 10 to 40 mass % of a solid lubricant consisting of one or more selected from alkali metal salt of hydroxystearic acid and alkali earth metal salt of hydroxystearic acid. A total content of the base oil, the solidifying agent, and the solid lubricant is 85 mass % or more and 100 mass % or less, and the lubricant film-forming composition does not contain heavy metals.
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