Production equipment of hydraulic prop pipe: Φ460 tapered roller piercing machine + PQF three-roll continuous pipe rolling mill with limiter mandrel. The production specification is 245~457mm. It will be put into production soon (designed production capacity is 500,000 tons). The target market of this unit It is a large-diameter, thick-walled seamless steel pipe (including high-pressure boiler tube) to replace domestic imports. A heat treatment line is also provided on the production line.