Method for forming L80-13Cr martensitic stainless steel seamless steel tube

Abstract

The invention relates to a method for forming a L80-13Cr martensitic stainless steel seamless steel tube. The process comprises the steps that 1, a 13Cr continuous casting billet is adopted; 2, the continuous casting billet is annealed; 3, the outer circle of the continuous casting billet is subjected to unilateral machining, and an outer surface oxide skin and a center loose layer are removed; 4,the treated continuous casting billet is uniformly heated to 1100 DEG C-1150 DEG C, and hot broaching is conducted; 5, hot extrusion is conducted on the continuous casting billet obtained after hot broaching; and 6, the hot-extruded steel tube is subjected to heat treatment to obtain the finished stainless steel seamless steel tube. According to the method, the continuous casting billet and hot extrusion forming process is combined, the problem that an existing production process is long in process flow and low in yield is solved, riser losses are reduced, the forging process is omitted, theyield of the martensitic stainless steel seamless steel tube can be increased, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing and production, and relates to a seamless steel pipe, in particular to a method for forming a novel L80-13Cr martensitic stainless steel seamless steel pipe. Background technique [0002] Due to the harsh conditions of use of pipes in the oil industry, ordinary carbon steel pipes cannot meet the requirements. According to literature reports, oil well shutdowns and scrapping accidents emerge in endlessly every year due to pipe corrosion, resulting in huge economic losses. Pipes such as dual-phase steel and nickel-based alloys have excellent performance, but are expensive, while 13Cr seamless steel pipes have excellent mechanical properties and corrosion resistance after quenching and tempering, and are economical. They are widely used in petrochemical, mechanical equipment, Mold manufacturing, aerospace military industry and other industries have good development prospects. 13Cr has...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for forming L80-13Cr martensitic stainless steel seamless steel pipes, which overcomes the problem of low yield in the process of producing seamless steel pipes by the existing forging billet + hot extrusion process, so as to reduce risers loss, reduce the forging process, increase the yield of steel pipes, and reduce production costs

Images