Chemical heat treatment method of pump cylinder
A technology of chemical heat treatment and heat treatment method, which is applied in the field of chemical heat treatment of pump barrels, can solve the problems of high heat treatment temperature, out-of-tolerance scrapping of pump barrels, etc., and achieve high abrasive wear resistance and improved corrosion resistance.
Inactive Publication Date: 2013-09-04
吕新青
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Problems solved by technology
[0013] The technical solution adopted by the present invention to solve the technical problem is: the chemical heat treatment method of the pump barrel, the heat treatment method includes the following steps: Step 1, adding osmotic agent: put the osmotic agent into the pump barrel, and then put the pump barrel into the well In the furnace, the above-mentioned penetrating agent is composed of 60-62% by weight of ferroboron, 18-20% of charcoal, 16-18% of potassium fluoroborate, 1.5-2.5% of urea, and 0.5-1.5% of rare earth. Nitriding in the pump barrel, rare earth can play a role in infiltration, and can obtain a better infiltration layer at a lower temperature, so as to solve the problem that the heat treatment temperature is too high and the pump barrel is out of tolerance and scrapped
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[0032] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0033] 1) Dosing agent: crush 61% ferroboron, 19% charcoal, 17% potassium fluoroborate, 2% urea, and 1% rare earth, mix well, add an appropriate amount of organic binder, and make it into granules or small cylinders , into the pump barrel 5 after drying.
[0034] 2) Furnace installation: connect the upper end of the pump barrel 5 to the spherical pump barrel sling 3 through the connecting pipe 4, and then hoist the spherical pump barrel sling 3 in the furnace 2, and the furnace 2 is hoisted in the furnace body 1.
[0035] 3) Electric heating: first heat to 650°C for 1 hour, then heat to 880°C, the main purpose is nitriding, and at the same time some materials in the infiltrating agent begin to gasify, if the temperature rises sharply at this time, it will easily cause the pump barrel 5 to expand Deformation, during the heating process, the pressure in the pump barre...
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Abstract
The invention discloses a chemical heat treatment method of a pump cylinder. The chemical heat treatment method comprises the following steps of: firstly filling a diffusion agent into the pump cylinder, wherein the diffusion agent comprises 60%-62% of ferroboron, 18%-20% of charcoal, 16%-18% of potassium borofluoride, 1.5%-2.5% of urea and 0.5%-1.5% of rare earth by weight, placing the pump cylinder in a vertical pit furnace through a spherical pump cylinder lifting appliance, then heating to 600 DEG C to 700 DEG C, carrying out heat preservation for 0.5-1.5 hours, continuously heating to 850 DEG C to 950 DEG C, and carrying out heat preservation for 3-5 hours; and finally cooling, when the temperature in the vertical pit furnace is reduced to 780 DEG C to 820 DEG C, carrying out temperature reduction and heat preservation for 1 to 2 hours, lifting the pump cylinder into a cooling cylinder, and carrying out forced cooling to a room temperature. The pump cylinder subjected to chemical heat treatment has relatively high hardness, good abrasion performance, corrosion resistance, high-temperature oxidation resistance and red hardness resistance.
Description
technical field [0001] The invention relates to a heat treatment process for a pump barrel, in particular to a chemical heat treatment method for a pump barrel. Background technique [0002] The oil well pump is one of the equipments widely used in the oil field. The pump barrel is the most important part of the oil well pump, accounting for more than 60% of the cost of the oil well pump. The pump barrel must be treated during production to improve the surface hardness, wear resistance and corrosion resistance of the inner hole. The currently used process methods mainly include the following: [0003] 1. Hard chrome plating: Hard chrome plating on the inner hole of the pump barrel can solve the problems of anti-corrosion, wear resistance and hardness. However, the chrome plating process causes serious environmental pollution and is a process that should be reduced or eliminated as much as possible. In addition, before plating, it is necessary to carry out alkali cleaning, ...
Claims
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IPC IPC(8): C23C8/76
Inventor 吕新青吕云霏高淑清
Owner 吕新青