Production method of corrosion-resistant and wear-resistant stainless steel hfw welded pipe with an outer diameter of 108-660.4mm

Abstract

The invention provides a production method of an anticorrosion wear-resistant stainless steel HFW welding pipe with an outer diameter of 108-660.4mm, According to the method, the welding pipe is molded and sized by adjusting molding and sizing four-roll rigid rack equipment, oval precision of the welding pipe is up to + / -0.2mm and straightness of the welding pipe is up to 0.2mm / m; welding spots are protected by argon in a high frequency welding process of the welding pipe; a heat treatment temperature control range of welding seams of the welding pipe is between 800-900 DEG C, the welding seams and heat affected zone parts are subject to normalizing heat treatment and heat preservation time is 30-60s; pipe body positions at two sides of the welding seams are cooled by circulating water during air cooling, temperature is transferred to the welding seam positions of the pipe body of the welding body, overhigh temperature of the welding seams before the welding seams enter a water cooling section is prevented, and welding quality is not affected by structural transformation. The production method has the beneficial effects that the welding pipe produced by the method has better anticorrosion performance and magnetic conductive property, the straightness and ovality of the welding pipe are improved by 30%, equipment fault rate is reduced to 0.3% from 3%, service life is doubled, and the length of a one machine conveyor belt is improved to 6000m from 3000m.

Description

technical field [0001] The invention relates to a production method of a welded steel pipe, in particular to a production method of a corrosion-resistant and wear-resistant stainless steel HFW welded pipe with an outer diameter of 108-660.4mm. Background technique [0002] At present, domestic belt conveyor rollers and mine ventilation pipes mostly use carbon steel steel pipes, which require high dimensional accuracy, good weld performance, and beautiful surface quality. [0003] The gas exhaust pipes used by domestic coal mining enterprises are used for underground operations, the environment is poor and the corrosion is serious, and thin-walled stainless steel pipes are required. [0004] Ordinary carbon steel pipes have disadvantages such as easy to corrode, easy to rust, unsightly appearance, and short service life. 400 series stainless steel has a martensitic structure and iron elements, has normal magnetic properties, strong high temperature oxidation resistance, and ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the shortcomings of common carbon steel pipes that are easy to corrode, easy to rust, and short service life, the purpose of the present invention is to provide a production method of corrosion-resistant and wear-resistant stainless steel welded steel pipes with an outer diameter of 108-660.4 mm, so as to solve the problem of carbon Steel is easy to corrode, easy to rust, short service life and other problems

Images