Metal heat treatment process

A metal heat treatment and process technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of unqualified thread tightness of joints, easy deformation of thread teeth, unqualified products, etc. The effect of thread tooth deformation and improving product qualification rate

Inactive Publication Date: 2016-10-05
赵云
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tempering the joint directly can reduce the hardness, but it brings new problems that the thread teeth on the joint are easily deformed, and a decarburization layer will be formed on the surface of the joint, resulting in unqualified joint thread tightness, and the final product is still unqualified. cause serious damage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] Put the drill pipe joint without phosphating layer on the surface, the material is 4137H (37CrMnMo), the hardness value is greater than HB331, put it into the electroplating tank of copper sulfate solution, and plate a layer of pure copper on the thread and sealing surface of the joint according to the conventional process; The joint is hoisted into the tempering furnace for tempering, the tempering temperature is controlled at 650°C, kept for 120 minutes, and then hoisted out of the water to cool to room temperature.

[0008] After the above treatment, the hardness value of the drill pipe joint is in the range of HB293-331, the comprehensive mechanical performance is high, and there will be no joint thread tooth deformation and surface decarburization.

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PUM

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Abstract

A metal heat treatment process is used for firstly performing copper plating on a tool joint with the surface not provided with a phosphate coating and then performing tempering treatment; and the tempering temperature is controlled to be 630-680 DEG C, heat preservation is performed for 100-140 min, and then water cooling is performed till normal temperature is achieved. The metal heat treatment process is used for solving the problem that in existing petroleum tool joint production, a hardness value is commonly high, and consequently the comprehensive mechanical performance is reduced, after the joint is treated, the hardness of the joint is reduced into the regulated range of HB293-331, deformation and surface decarburization of thread teeth of the joint can also be prevented, the close distance requirement of threads is met, the product yield is increased, and benefits are remarkable.

Description

technical field [0001] The invention relates to a metal heat treatment process, in particular to a treatment process for correcting the relatively high hardness value of oil drill pipe joints. The invention belongs to the technical field of metal heat treatment. Background technique [0002] Oil extraction is inseparable from oil drill pipe, which is composed of drill pipe joint and drill pipe body. The material of the drill pipe joint is generally 4137H (37CrMnMo). From the analysis of mechanical properties, when the hardness value changes within the range of HB293-331, the tensile strength, yield strength, and Charpy impact energy increase with the increase of the hardness value; when When the hardness value is greater than HB331, the tensile strength increases, but the yield strength and Charpy impact energy decrease. When the hardness value is too high, the comprehensive mechanical performance index decreases, the plasticity of the joint decreases, and it is easy to br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/50C21D9/00C21D1/18
Inventor 不公告发明人
Owner 赵云
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