Production method of 15CrMo thick-wall seamless steel pipe

Abstract

The invention discloses a production method of a 15CrMo thick-wall seamless steel pipe. The production method comprises the following steps: (1) a pipe blank is customized; (2) the pipe blank is inspected, namely the rough inspection is manually performed for the appearance of the round steel; (3) the round steel is heated; (4) an ejection head and an ejection rod are selected for perforating; (5) acid pickling and solid solution treatment are performed for the perforated round pipe; (6) first cold rolling machining is performed for the round pipe after the acid pickling and solid solution treatment; (7) three passes of cold drawing are performed for the rough pipe after acid pickling, polishing, lubrication and airing; (8) after degreasing and solid solution treatment, the round pipe subjected to the cold drawing is made into a refined steel pipe with the diameter of 160 mm through a second pass of cold drawing; and (9) the refined steel pipe is inspected after solid solution treatment, acid pickling and acid pickling passivation, and a finished seamless pipe is obtained if the refined steel pipe passes the inspection. The production method of the 15CrMo thick-wall seamless steel pipe, provided by the invention, effectively controls the tolerance range of the inner diameter, and the manufactured steel pipe has the advantages of lower surface roughness, low deformation and excellent usability.

Description

technical field [0001] The invention relates to a method for manufacturing seamless pipes, in particular to a method for manufacturing 15CrMo thick-walled seamless steel pipes. Background technique [0002] The production of thick-walled seamless pipes is divided into cold drawing and hot rolling. The materials are divided into ordinary pipes and alloy pipes. The product obtained by diameter reduction has complex production methods and cumbersome operations. The quality of the thick-walled seamless pipe produced is average and the surface roughness is poor. Contents of the invention [0003] The main technical problem to be solved by the present invention is to provide a method for manufacturing 15CrMo thick-walled seamless steel pipe, which can effectively control the tolerance range of the inner diameter, and at the same time have small surface roughness, small deformation, good performance and simple operation. [0004] In order to solve the above technical problems, a...

AI Technical Summary

Problems solved by technology

[0002] The production of thick-walled seamless pipes is divided into cold drawing and hot rolling. The materials are divided into ordinary pipes and alloy pipes. The products obtained by diameter reduction are complex in production method and cumbersome in operation.