METHOD FOR PRODUCING HOT-ROLLED SEAMLESS PIPES FROM TRANSFORMABLE STEEL, IN PARTICULAR FOR PIPELINES FOR DEEP-WATER APPLICATIONS, AND CORRESPONDING PIPES
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Feb 23, 2015
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Feb 25, 2014
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Abstract
A method for producing hot-rolled seamless pipes from transformable steel for pipelines in which the pipe ends are hot-upsetted in order to achieve a thickened wall portion after a final rolling process of the pipes to provide pipes with excellent fatigue, corrosion, and welding properties. A pre-selected ratio between a wall thickness of the pipe end and a wall thickness of a wall body adjoining the pipe end is set by the hot-upsetting process such that a pipe is achieved with a pipe end which has a lower strength than the pipe body after a uniform tempering process of the entire pipe following the hot-upsetting process by using a previously ascertained wall thickness-dependent cooling rate during the tempering process.
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