Heat treatment process of welded type weighted drill rod joint

A drill pipe joint and welding technology, applied in heat treatment baths, heat treatment furnaces, heat treatment equipment, etc., can solve problems such as cracking, achieve the effects of preventing cracking, controlling quenching and cooling speed, and improving stability and uniformity

Inactive Publication Date: 2013-08-07
JIANGSU SHUGUANG OIL DRILLING EQUIP CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention mainly aims at the problem that AISI4145 material is easily cracked by applying conventional heat treatment process, and proposes a heat treatment process of welded heavy drill pipe joint with reasonable process parameters, standardization and e

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  • Heat treatment process of welded type weighted drill rod joint

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Embodiment 1

[0014] In this embodiment, the diameter of the welded heavy drill pipe joint is φ170mm, and the material is AISI4145. The supporting heat treatment process is carried out according to the following steps: a. The end is facing down, and the distance between the periphery and the upper layer is 40 mm. b. Quenching: b1. After the furnace temperature rises to 875°C, keep it warm for 80 minutes. b2. Stir the prepared KR218 quenching oil 10 minutes before the workpiece is released from the furnace, and the oil temperature is controlled at 80°C±1°C. b3. The workpiece is taken out from the back chamber of the furnace and put into the quenching oil for quenching, and the workpiece is cooled in the quenching oil for 12 minutes. c. Tempering: c1. The workpiece is tempered within 3.5 hours after quenching. The temperature of the tempering furnace is raised to 615°C and kept for 140 minutes; c2. The workpiece is taken out of the tempering furnace and put into a water tank to cool to room ...

Embodiment 2

[0016] In this embodiment, the diameter of the welded heavy drill pipe joint is φ130mm, and the material is AISI4145. The matching heat treatment process is carried out according to the following steps: a. The end is facing down, and the distance between the periphery and the upper layer is 26mm. b. Quenching: b1. Heat the temperature of the furnace to 865°C for 60 minutes. b2. Stir the prepared KR218 quenching oil 5 minutes before the workpiece comes out of the furnace, and the oil temperature is controlled at 80°C±1°C. b3. The workpiece is taken out from the back chamber of the furnace and put into the quenching oil for quenching, and the workpiece is cooled in the quenching oil for 10 minutes. c. Tempering: c1. The workpiece is tempered within 3.5 hours after quenching. The temperature of the tempering furnace is raised to 605°C and kept for 120 minutes; c2. The workpiece is taken out of the tempering furnace and put into a water tank to cool to room temperature.

[0017]...

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Abstract

The invention discloses a heat treatment process of a welded type weighted drill rod joint. The heat treatment process comprises the following steps of: sequentially placing workpieces into a box type quenching furnace, vertically placing in a large-space mode, heating the furnace to 860 to 890 DEG C, preserving heat for at least 60 minutes, and stirring quenching oil before discharging the workpieces out of the furnace, wherein the oil temperature is controlled to be 80+/-1 DEG C; taking the workpieces out of the furnace, throwing the workpieces into the quenching oil at once, quenching, and cooling the workpieces in the quenching oil for at least 10 minutes; performing tempering treatment on the workpieces within 3.5 hours after the workpieces are quenched, heating a tempering furnace to 600 to 630 DEG C, preserving heat for at least 120 minutes, taking the workpieces out of the tempering furnace, throwing the workpieces into a water channel at once, and cooling to normal temperature. By adopting the heat treatment process, the quenching quality is improved mainly by taking a series of technology measures of reducing the quenching upper limit temperature, increasing the heat-preserving time and the like, so that the cracking phenomenon is avoided.

Description

technical field [0001] The invention relates to a metal heat treatment process, in particular to a heat treatment process for a welded heavy drill pipe joint made of AISI4145 material. Background technique [0002] Welded heavy-duty drill pipe joint is a thick-walled pipe with inner and outer pipe threaded joints at both ends. After connecting with the drill pipe, it forms a direct connection structure between the upper and lower joints. The working conditions of the drill pipe joint during drilling are very complicated. It not only plays the role of connecting the upper and lower joints, but also directly transmits the torque and bears the impact force. Therefore, the drill pipe joint must have sufficient strength and good toughness. The industry generally uses AISI4145 steel to manufacture welded heavy drill pipe joints. AISI4145 steel is a high-quality high-strength alloy steel, and its mechanical properties can be greatly improved after quenching. However, this material...

Claims

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Application Information

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IPC IPC(8): C21D9/50C21D1/18C21D1/50
Inventor 张正荣张希平蒋后平杨爱华
Owner JIANGSU SHUGUANG OIL DRILLING EQUIP CO LTD
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