QPQ salt bath compound heat treatment technology for heat resistance of coal mine stand column cylinder barrel

A salt-bath composite and cylinder technology, which is applied in heat treatment baths, heat treatment furnaces, heat treatment equipment, etc., can solve problems such as scrapping, corrosion of sealing surfaces, pitting of cylinders, etc., to achieve wide application, ensure stability, and improve use. effect of life

Inactive Publication Date: 2019-10-29
晋中开发区圣邦液压器件有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most of the sealing surfaces of coal mine column cylinders are cold-rolled or scraped-rolled and used directly without any anti-corrosion treatment. scrapped

Method used

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Embodiment Construction

[0024] The present invention optimizes and improves on the basis of the traditional QPQ salt bath compound heat treatment process. The traditional QPQ salt bath compound heat treatment process is directly oxidized after sulfur and nitrogen carburizing or nitrogen carburizing, while the present invention combines sulfur and nitrogen carburizing Or combine nitrocarburizing and tempering, and if necessary, strengthen and toughen the substrate before nitrocarburizing; or treat the cylinder substrate with high-temperature solid solution and fine-grained strengthening treatment -> sulfur nitrogen carburizing or nitrocarburizing Combined with preheating -> secondary strengthening and toughening by complex isothermal quenching.

[0025] 1) Degreasing the cylinder;

[0026] 2) Preheating;

[0027] 3) Nitriding, using sulfur nitrogen carburizing or nitrocarburizing, the nitriding temperature is 570±10°C, and the time is 10-180 minutes;

[0028] 4) oxidation;

[0029] 5) The first boi...

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Abstract

The invention belongs to the technical field of coal mine support stand columns and discloses a QPQ salt bath compound heat treatment technology for heat resistance of a coal mine stand column cylinder barrel. The QPQ salt bath compound heat treatment technology for heat resistance of the coal mine stand column cylinder barrel comprises the technological process of removing oil of the cylinder barrel, conducting preheating, conducting nitriding, wherein sulphonitrocarburizing or nitrocarburizing is adopted; conducting oxidation; conducting boiling in a first boiling water bath to remove oxidation residual salt and conducting flushing with tap water; conducting rinsing in a second boiling water bath and conducting drying; dipping the cylinder barrel in hot oil. The sulphonitrocarburizing ornitrocarburizing is combined with tempering, and strengthening and toughening treatment is conducted on a matrix before sulphonitrocarburizing or nitrocarburizing; before nitriding, high-temperaturesolid solution micronizing strengthening treatment is conducted on the cylinder body, and after nitriding, complex phase isothermal quenching secondary strengthening and toughening treatment is conducted on the cylinder body. The hardness of the surface of the stand column cylinder barrel processed by the adoption of the QPQ salt bath compound heat treatment technology is improved, and the oxide layer formed on the surface has quite high corrosion resistance, and the service life of the cylinder barrel is prolonged in a multiplied manner. Besides, the QPQ salt bath compound heat treatment technology can be used both for corrosion resistance of a new cylinder barrel and a used cylinder barrel.

Description

technical field [0001] The invention belongs to the field of coal mine support columns, and in particular relates to a QPQ salt bath composite heat treatment process for anticorrosion of coal mine column cylinders. Background technique [0002] At present, most of the sealing surfaces of coal mine column cylinders are cold-rolled or scraped-rolled and used directly without any anti-corrosion treatment. scrapped. In order to improve the service life of the cylinder, QPQ salt bath compound heat treatment is carried out on the cylinder. [0003] QPQ" is the abbreviation of English "Quench-Polish-Quench". The original meaning is quenching-polishing-quenching. It is called QPQ salt bath composite treatment technology in China. The workpiece is treated in two salt baths: salt bath and oxidation salt bath. The QPQ salt bath composite heat treatment technology can not only make the workpiece almost not deformed, but also greatly improve the wear resistance and corrosion resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/52C23C8/56C23C8/80C21D1/20C21D1/46C21D9/00
CPCC21D1/20C21D1/46C21D9/0068C23C8/52C23C8/56C23C8/80
Inventor 蒋世银李国俊何燕候晓旺
Owner 晋中开发区圣邦液压器件有限公司
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