Method of quenching and tempering large-diameter thin-wall...

Details Method of quenching and tempering large-diameter thin-wall... Method of quenching and tempering large-diameter thin-wall...

C - Chemistry, Metallurgy

21

D

38/5, 148/50

C21D 1/62 (2006.01) C21D 8/10 (2006.01) C21D 9/08 (2006.01)

Patent

CA 1066595

Abstract of the Disclosure A method and apparatus for quenching and tempering a large-diameter thin-wall steel pipe without deforming the steel pipe, characterized in that when quenching the steel pipe which has been heated to a quenching temperature to a room temperature, the steel pipe is cooled while restraining or constraining the steel pipe in a desired shape and correcting the steel pipe at a temperature between 400 and 600°C. Further, when tempering the steel pipe, if it is necessary, immediately after the steel pipe has been heated up to a tempering temperature the steel pipe may be restrained and corrected to an exact round shape to thereby produce a quenched and tempered large-diameter thin- wall steel pipe having a further improved roundness.

243800

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