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Thick-wall heavy-caliber duct joint heat processing technology

A conduit joint and large-diameter technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of thick wall, difficult hardening, residual internal stress, etc., to improve fatigue resistance, stabilize quenching quality, reduce The effect of internal stress in the metal

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

AI Technical Summary

Problems solved by technology

The pipe joints used in the manufacture of deep-sea oil drills are usually made of high-strength alloy steel. Because the diameter of the pipes used in deep-sea oil drills is large, the diameter of the matching pipe joints is also large, and the wall thickness is very thick. It is difficult to harden through the conventional heat treatment process, and it is easy to remain after quenching. Large value of internal stress, cracks caused by internal stress is an important factor for the failure of conduit joints, once a fracture accident occurs, the economic loss will be huge

Method used

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  • Thick-wall heavy-caliber duct joint heat processing technology

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Effect test

Embodiment 1

[0015] The diameter of the conduit joint in this embodiment is 552 mm, the maximum wall thickness is 48 mm, and the material is 30CrMo. The heat treatment process for the thick-walled large-diameter conduit joint of the present invention includes the following steps:

[0016] a. Furnace loading for the first time: Load the pipe joint blanks into the well-type quenching furnace in sequence, with the welding neck facing down, and the distance between the periphery of the vertical pipe joint blanks and the upper and lower layers is 25mm.

[0017] b. The first quenching:

[0018] b1. Raise the temperature of the furnace to 885°C within 60±5 minutes, and then keep it warm. The holding time is calculated as 40 minutes per 25.4 mm wall thickness, and the holding time in this embodiment is 20 minutes.

[0019] b2. Stir the water in the quenching pool 10 minutes before the conduit joint blank is released from the furnace, and control the water temperature at 30°C to 36°C.

[0020] b3....

Embodiment 2

[0027] The diameter of the conduit joint in this embodiment is 940 mm, the maximum wall thickness is 78 mm, and the material is 30CrMo. The heat treatment process for the thick-walled large-diameter conduit joint is used for the process, which includes the following steps:

[0028] a. Furnace loading for the first time: Load the pipe joint blanks into the well-type quenching furnace in sequence, with the welding neck facing down, and the distance between the vertical pipe joint blanks and the upper and lower layers is 50mm.

[0029] b. The first quenching:

[0030] b1. Raise the furnace temperature to 895°C within 60±5 minutes, and then keep it warm. The holding time is calculated as 40 minutes per 25.4 mm wall thickness. The holding time in this embodiment is 130 minutes.

[0031] b2. Stir the water in the quenching pool 10 minutes before the conduit joint blank is released, and control the water temperature at 30°C to 36°C;

[0032] b3. It takes less than 15 seconds for the...

Embodiment 1 and Embodiment 2

[0038] Example 1 and Example 2 main mechanical properties sampling test table

[0039]

[0040] The above-mentioned embodiment is a preferred example of the present invention. Even if some adjustments are made within the process index range, a similar heat treatment effect can be obtained. The mechanical properties of the heat-treated conduit joint can meet the design requirements, and the first pass rate is above 96%.

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Abstract

The invention discloses a thick-wall heavy-caliber duct joint heat processing technology. The technology comprises the following steps of: downwards installing a duct joint from a welding neck in a well-type quenching furnace vertically in furnace charging; keeping intervals among the periphery, the upper layer and the lower layer; keeping the temperature of a furnace at 871DEG C-899DEG C for at least 120 minutes; hoisting the duct joint out of a hearth, inputting into a quenching water tank at the water temperature of 30 DEG C-36 DEG C within 15 seconds for quenching for the first time; carrying out water cooling for at least 150 minutes, then sending into the furnace for normalizing treatment at the temperature of 899DEG C-940DEG C; carrying out tempering within 3 hours after the quenching for the first time, wherein the tempering temperature is 595DEG C-640DEG C; keeping the tempering temperature for at least 240 minutes; and then hoisting the duct joint out od the hearth, and putting the duct joint directly in a water channel for cooling to the normal temperature. According to the invention, the metal phase tissue is improved through repeated heat processing twice, and the mechanical performance is improved further so as to meet the deep-sea petroleum drilling and exploitation requirement.

Description

technical field [0001] The invention relates to a metal heat treatment process, in particular, the invention relates to a heat treatment process for thick-walled and large-diameter conduit joints used in deep-sea oil drilling. Background technique [0002] Over the past hundred years, oil has been one of the most widely used energy sources. Due to over-exploitation, some easy-to-exploit land and shallow sea oil resources on the earth are becoming increasingly depleted. Petroleum resources in oceans, especially deep sea areas. This kind of strategic industrial transfer needs to be based on advanced deep-sea oil drilling technology and supporting equipment in order to achieve the expected goal. The depth of deep-sea oil drilling is usually several thousand meters, and the length of the pipe joint used also needs to be several thousand meters. Due to its weight, it must also bear a certain amount of torque and damage against the impact of waves, so it has high requirements for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/28C21D9/00
Inventor 梅友松张希平蒋后平游学宇
Owner JIANGSU SHUGUANG OIL DRILLING EQUIP CO LTD