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

A production method, stainless steel technology, applied to pipeline systems, welding equipment, tubular objects, etc., can solve the problems of carbon steel being easy to corrode, easy to corrode, and short service life, and achieve cost saving, good corrosion resistance, and increased service life Effect

Active Publication Date: 2017-03-22
TIANJIN STEEL PIPE MFG CO LTD
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  • Description
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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

Method used

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

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Embodiment Construction

[0023] The production method of the corrosion-resistant and wear-resistant stainless steel HFW welded pipe with an outer diameter of 108 to 660.4 mm of the present invention is based on the production process of ordinary carbon steel, by controlling the sizing equipment, the parameters of the forming process, the high-frequency welding and the intermediate-frequency heat treatment temperature, and at the same time When the steel pipe is welded, the protective gas is introduced through the high-frequency straight seam welded pipe inner water curtain argon comprehensive welding protection device to protect the welding point and improve the welding quality. In addition, the geometric dimension accuracy of the steel pipe is improved, the outer diameter accuracy reaches ±0.2mm, and the straightness reaches 0.2mm / m. By improving the inner burr tool that goes deep into the middle of the pipe body, the shielding gas is brought into the lumen to protect the welding point and complete th...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P23/04B23K13/00B23K101/10
CPCB23K13/00B23K2101/06B23P23/04
Inventor 邵毅王志斌李岩郝明刚颉毅
Owner TIANJIN STEEL PIPE MFG CO LTD
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