Petroleum drilling rod joint higher hardness number treating process

A technology for oil drill pipe joints and drill pipe joints, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve problems such as unqualified joint thread tightness, easy deformation of thread teeth, unqualified products, etc., to achieve guaranteed thread The effect of tight distance requirements, prevention of thread tooth deformation, and improvement of product qualification rate

Inactive Publication Date: 2006-05-24
江苏曙光集团有限公司
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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

[0008] Example 1: 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 of the joint and the sealing surface according to the conventional process ; Then hoist the joint into the tempering furnace for tempering, control the tempering temperature to 650°C, keep it warm for 120min, and then hoist it out of the water to cool to room temperature.

[0009] Example 2: Put the drill pipe joint with a phosphating layer on the surface, the material is 4137H (37CrMnMo), and the hardness value is greater than HB331. One method of copper plating and tempering.

[0010] 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 decarburizati...

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PUM

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Abstract

The invention relates to a processing technique used in petroleum tool joint hardness number on the high side. The tool joint with no phosphorizatin layer is copperized, takes tempering treatment, controls the tempering temperature at 630-680 degree centigrade, keeps for 100-140 min water-cooling to normal temperature. To the tool joint with phosphorization layer is taking acid washing to remove phosphorization then compperizing and taking tempering treatment. The invention improves the product yield and has great benefits.

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. 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). According to the analysis of mechanical properties, when the hardness value changes in the range of HB293-331, the tensile strength, yield strength and Charpy impact energy increase with the increase of the hardness value; 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 break. Only with high comprehensive mechanical performance can it be suitab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08C21D1/68C21D11/00
Inventor 蒋家华张希平周开华
Owner 江苏曙光集团有限公司
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