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Heat treatment process for joint of petroleum drill rod

A technology for oil drill pipe joints and oil drill pipes, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as difficulty in meeting standard requirements, late start of production of drill pipe joints, etc.

Inactive Publication Date: 2005-04-06
江苏曙光石油钻具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's production of oil drill pipes, especially drill pipe joints, started late. According to the conventional metal heat treatment process, it is difficult to meet its standard requirements, and the product qualification rate is only 60% to 70%.
At present, there is no mature heat treatment process for drill pipe joints in China, and there are no reports abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] Below by embodiment the present invention will be further described.

[0017] (1) Put the oil drill pipe male joint of material 37crMnMoH type Nc50 (41 / 2IF) into the material frame, with the welding neck end facing down, and the spacing is 40mm;

[0018] (2) The pit type quenching furnace is heated up to 870°C, installed, heated, and kept warm for 80 minutes;

[0019] (3) Start the submersible pump at the bottom of the quenching tank 6 minutes in advance to stir the quenching liquid. The quenching liquid is AQ364 aqueous solution with a concentration of 8%, and the temperature of the quenching liquid is adjusted to 36 ± 1 °C through the cold water in the stainless steel hose;

[0020] (4) The joint is lifted out of the furnace, immersed in the quenching liquid within 10 seconds, rotated 8 times in the circumferential direction, and cooled for 6 minutes;

[0021] (5) Take out a joint from each furnace for Rockwell hardness test, and make a record;

[0022] (6) Within 3...

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Abstract

One kind of petroleum drilling rod coupling heat treatment craft, after the main characteristic is installs the petroleum drilling rod coupling the frame to put in the elevation of temperature to in the 850deg.C~~900deg.C hardening furnace, keeps warm the 45~~95 minute, meets fast is entering after stirs, the temperature is in the 34deg.C~~38deg.C hardening liquid, at least cools 5 minutes, again loads the elevation of temperature to in the 560deg.C~~670deg.C tempering furnace, catches a chill, keeps warm the 120~~180 minute, latter draws a charge cooling to the normal temperature. The invention uses in petroleum drilling rod coupling quenching, the tempering heat treatment, solves in the present domestic petroleum drilling rod coupling production because the heat treatment craft not to be mature, causes the product qualified rate is only 60%~70% technical question, provides a kind to be reasonable, the standard, is advantageous for the operation heat treatment craft, caused the drilling rod coupling the degree of hardness, the intensity, the elongation ratio, the impact merit and so on completely to conform to the technical requirement, the qualified rate reaches above 99%.

Description

technical field [0001] The invention relates to a heat treatment process for metal parts, in particular to a quenching and tempering process for oil drill pipe joints. Background technique [0002] The oil drill pipe used in the oil drilling industry connects several pipe bodies to the required length through joints. The joints are generally made of high-quality carbon structural steel. According to the standard requirements, the mechanical properties such as hardness, strength, and toughness are very high. , so the heat treatment process is very important in production. my country's production of oil drill pipes, especially drill pipe joints, started late. According to the conventional metal heat treatment process, it is difficult to meet the standard requirements, and the qualified rate of products is only 60% to 70%. At present, there is no mature heat treatment process for drill pipe joints in China, and there are no reports abroad. Contents of the invention [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00
Inventor 张希平周开华
Owner 江苏曙光石油钻具有限公司
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