Heating processing technology of metal steel tube

A technology of chemical heat treatment and steel pipe, applied in the field of heat treatment to achieve the effect of prolonging service life, ensuring quality and reducing construction cost

Inactive Publication Date: 2011-06-01
大连三木得科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing heat treatment process is difficult to meet the requirements of fatigue life, wear resistance, corrosion resistance, seamless and no cracks of steel pipes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The technical solution adopted in the present invention adopts the method of combining ferrite chemical heat treatment and austenite heat treatment. First, the steel pipe is subjected to low-temperature chemical heat treatment of sulfur and nitriding; then above the critical temperature, high-temperature chemical heat treatment of carbonitriding; at the same time, above the critical temperature, high-temperature chemical heat treatment of boronizing; then austenitic nitriding ; Finally, the conditioning is carried out. The specific process of the whole heat treatment process is:

[0013] (1) Purify the ammonia gas and heat it to 500°C±50°C through a spiral pipeline. The ammonia gas will precipitate nitrogen ions after heating, add sodium thiosulfate to the mixer, and keep the temperature within 650°C±50°C , and apply an atmospheric pressure of 0.15±0.05Pa, the sulfur and nitrogen ions form a vortex through the swirl pipe and slowly fill the surroundings of the steel pi...

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Abstract

The invention discloses a heating processing technology of a metal steel tube, and belongs to the field of heat processing methods. The heating processing technology of a metal steel tube is characterized by adopting a method combing ferrite chemical treatment and austenite heat treatment; firstly carrying out low-temperature chemical heat treatment of sulfonitriding; then carrying out high-temperature chemical heat treatment of sulfonitriding over the critical temperature; simultaneously carrying out high-temperature chemical heat treatment of boriding over the critical temperature; then implementing austenite nitriding; and finally hardening and tempering. The manufactured steel tube has good quality and long service life, and the construction cost is low, and the whole process is environment-friendly.

Description

technical field [0001] The invention belongs to the field of heat treatment methods, in particular to a heat treatment process for metal steel pipes. Background technique [0002] The invention relates to a heat treatment process for steel pipes. Steel pipes are inseparable from human life and production activities, from daily utensils, furniture, water supply and drainage, gas supply, ventilation and heating facilities to the manufacture of various agricultural machinery and tools, the development of underground resources, guns, bullets and missiles used in national defense and aerospace , Rockets, etc. are inseparable from steel pipes. The steel pipe can also be used to transport fluid and powdery solids, exchange heat energy, and manufacture mechanical parts and containers. It is an economical steel product. Steel pipes can also be used to manufacture building structure grids, pillars and mechanical supports to realize factory-like and mechanized construction. In order...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/28C23C8/32C23C8/70C21D1/25C21D9/08
Inventor 勇莉勇晶
Owner 大连三木得科技有限公司
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