The Medium Frequency Local-Heating Expanding Diameter Process (MFLHEDP), also called the hot-expanding process, can produce large diameter thin-wall steel pipes. Because of its advantages, such as low cost, short delivery time etc., MFLHEDP becomes an important supplement for the traditional processes of seamless steel pipe manufacturing. In the presented study, the short-term mechanical properties and the high-temperature long-term rupture strength of a P91 pipe the diameter of which was expanded using MFLHEDP, were tested. The experimental result shows that the performances of the P91 pipe produced by MFLHEDP can meet the requirements of the applicable standards.

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