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Pipe joint rear cutting ferrule and heat processing method

A heat treatment method and joint card technology, applied in the direction of pipe/pipe joint/pipe fitting, sealing surface connection, coating, etc., can solve the problems of inability to adapt to pressure and sealing requirements, deterioration of corrosion resistance, poor anti-seizure performance, etc. Achieve the effect of improved mechanical properties, good corrosion resistance and enhanced hardness

Inactive Publication Date: 2009-01-14
JIANGSU HAINA MECHANICAL & ELECTRIC EQUIP GRP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The ferrule back ferrule is an important part of the pipe joint used for fluid pipeline connection. This product is widely used in various industries such as petroleum, chemical industry, papermaking, food, pharmaceutical, aviation, transportation, etc. In order to meet the requirements of anti-corrosion, the ferrule ferrule A large number of rear clamps are made of austenitic stainless steel, but austenitic stainless steel itself has low strength, poor mechanical properties, poor anti-seizing performance, and cannot meet the requirements of pressure and sealing. There are also heat treatments for the rear clamps of ferrules to improve strength, but All of them sacrificed the corrosion resistance, which significantly deteriorated the corrosion resistance and could not meet the required requirements.

Method used

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  • Pipe joint rear cutting ferrule and heat processing method
  • Pipe joint rear cutting ferrule and heat processing method

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Embodiment Construction

[0019] Below in conjunction with the accompanying drawings, the present invention will be described in detail. The rear card of the present invention is a rear card ferrule with a double clamp structure, such as figure 1 As shown, it includes a rear card body 1 with a tapered front end, and a reinforced solid solution infiltrated layer 2 is compounded on the outer surface of the rear card body 1. The thickness of the reinforced solid solution infiltrated layer 2 is 10-30 μm, and the reinforced solid solution infiltrated layer 2 can be a carburized layer, a nitrided layer or a carbonitrided layer.

[0020] The taper of the front taper surface of the rear card body is 60-80°, the rear end of the rear card body and the action surface of the joint nut form an arc surface, and the radius of the arc surface is R, see figure 2 .

[0021] Use low-pressure plasma glow discharge technology to carry out nitriding surface strengthening on the austenitic stainless steel back card between...

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Abstract

The invention discloses a post-ferrule of pipe joint ferrule and the heat treatment method. The post-ferrule comprises post-ferrule body whose front end is cone. A strengthening solid solution seepage layer is compounded on the post-ferrule body. The thickness of said strengthening solid solution seepage layer is 10-30 mu m. The strengthening solid solution seepage layer can be nitrided layer, carburized layer or carbonitriding layer. The heat treatment method is that under pressure of 100-150Pa and temperature of 300-450deg.C, nitrided, carburized or carbonitriding technology is carried out for ferrule body and the time is for 60-120 minutes. In the invention by heat treatment method a strengthening solid solution seepage layer is compounded on the post-ferrule body so that the mechanical performance of outer surface of post-ferrule body can be improved, the intensity is improved and meanwhile corrosion resistance can be guaranteed.

Description

technical field [0001] The invention relates to a ferrule for a pipe joint and a heat treatment method, in particular to a ferrule with good mechanical performance and corrosion resistance and a heat treatment method. Background technique [0002] The ferrule back ferrule is an important part of the pipe joint used for fluid pipeline connection. This product is widely used in various industries such as petroleum, chemical industry, papermaking, food, pharmaceutical, aviation, transportation, etc. In order to meet the requirements of anti-corrosion, the ferrule ferrule A large number of rear clamps are made of austenitic stainless steel, but austenitic stainless steel itself has low strength, poor mechanical properties, poor anti-seizing performance, and cannot meet the requirements of pressure and sealing. There are also heat treatments for the rear clamps of ferrules to improve strength, but All of them sacrificed the corrosion resistance, so that the corrosion resistance d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L19/04C23C8/22C23C8/26C23C8/32
Inventor 王成虎
Owner JIANGSU HAINA MECHANICAL & ELECTRIC EQUIP GRP
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