US2013269407A1PendingUtilityA1

Method for producing seamless steel tube/pipe

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Assignee: TATEBAYASHI YOSUKEPriority: Dec 22, 2010Filed: Dec 20, 2011Published: Oct 17, 2013
Est. expiryDec 22, 2030(~4.4 yrs left)· nominal 20-yr term from priority
Inventors:Yosuke TatebayashiYasuto HigashidaSumio Iida
C10N 2040/247C10M 2201/087C10N 2050/02B21B 19/04C10N 2040/241C10M 173/02C10M 2201/0873B21B 25/04C10M 2201/1033
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Claims

Abstract

When performing piercing-rolling by use of a plug with a protection film on its surface, applying a lubricant made of an aqueous solution containing a total of 5 to 30% mass % of one or more of boron oxide, boric acid, and amine borate to the protection film on the plug surface, and using this plug for piercing-rolling makes it possible to realize the increase of the life of plug for piecing-rolling without reducing the efficiency of piercing-rolling. The plug can be cooled after the piecing-rolling, the application of the above described lubricant is performed when the surface temperature of the front edge of plug decreases to 100° C. or less, and the plug is reused for the piercing-rolling. In this occasion, the protection film on the plug . surface can be formed by arc spraying iron wire material onto the surface of the base metal of plug, and comprises oxides and Fe.

Claims

exact text as granted — not AI-modified
1 . A method for producing a seamless steel tube/pipe in which piercing-rolling is performed by using a plug with a protection film on a surface thereof, comprising:
 applying a lubricant made of an aqueous solution containing a total of 5 to 30 mass % of one or more of boron oxide, boric acid, and amine borate to the protection film of the plug for use in the piercing-rolling.   
     
     
         2 . The method for producing a seamless steel tube/pipe according to  claim 1 , wherein
 the plug is cooled after piercing-rolling, the lubricant is applied when the surface temperature of the front edge of plug decreases to 100° C. or less, and the plug is reused for the piercing-rolling.   
     
     
         3 . The method for producing a seamless steel tube/pipe according to  claim 1 , wherein
 the protection film is formed by arc-spraying iron wire material on the surface of the base metal of plug, and comprises oxides and Fe.   
     
     
         4 . The method for producing a seamless steel tube/pipe according to  claim 2 , wherein
 the protection film is formed by arc-spraying iron wire material on the surface of the base metal of plug, and comprises oxides and Fe.

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