CN100451423C

CN100451423C - Pipe joint rear cutting ferrule and heat processing method

Info

Publication number: CN100451423C
Application number: CNB2007100246069A
Authority: CN
Inventors: 王成虎
Original assignee: JIANGSU HAINA ELECTROMECHANICAL MANUFACTURING Co Ltd
Current assignee: JIANGSU HAINA ELECTROMECHANICAL MANUFACTURING Co Ltd
Priority date: 2007-06-22
Filing date: 2007-06-22
Publication date: 2009-01-14
Anticipated expiration: 2027-06-22
Also published as: CN101078453A

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

A kind of heat treatment method of pipe joint rear cutting ferrule

Technical field

The present invention relates to a kind of pipe coupling cutting ferrule and heat treatment method, particularly a kind of good mechanical property and corrosion resistant rear cutting ferrule and heat treatment method.

Background technique

Rear cutting ferrule is the vitals that is used for the pipe coupling of fluid pipe-line connection, this product is applied in oil widely, chemical industry, papermaking, food, pharmacy, aviation, in all trades and professions such as transportation, for etch-proof requirement, rear cutting ferrule adopts the Austenitic Stainless Steel manufacturing in a large number, but the intensity of austenitic stainless steel material own is low, poor mechanical property, the bite-resistant performance is poor, can not adapt to the requirement of pressure and sealing, also there is pair rear cutting ferrule to heat-treat to improve intensity, but all be to have sacrificed decay resistance, make corrosion resistance significantly worsen, can not reach required requirement.

Summary of the invention

Technical problem to be solved by this invention is at above-mentioned the deficiencies in the prior art, and a kind of good mechanical property and corrosion resistant rear cutting ferrule and heat treatment method are provided.

For solving the problems of the technologies described above, the present invention adopts following technological scheme, and it comprises that front end is the back card body of the conical surface, is compounded with one on the card body of described back and strengthens the solid solution infiltration layer.

Back card adopts the Austenitic Stainless Steel manufacturing, and Austenitic Stainless Steel self has good decay resistance, compound one strengthens the solid solution infiltration layer then on the card body of back, and hardness of this layer and wear resistance all have raising by a relatively large margin.Micro-penetration hardness reaches 1000HV, compares with the protocorm material, and wear resistance has improved 2～3 times.

The thickness of described reinforcement solid solution infiltration layer is 10～30 μ m.

Described reinforcement solid solution infiltration layer is carburized case, nitriding layer or carbonitrided case.

The tapering of the front end conical surface of described back card body is 60～80 °, the acting surface camber face of card body rear end, back and Female connector fittings.

Heat treatment method of the present invention is at pressure 100～150Pa, under 300～450 ℃ of the temperature cutting ferrule body is carried out carburizing, nitriding or carbonitriding and handles 60～120 minutes time.

Utilize the low pressure plasma glow discharge technique between 350～450 ℃, Austenitic Stainless Steel to be carried out rapid nitridation, nitriding or carbonitriding surface peening, at pressure 100～150Pa, handle nitrogen supersaturated austenite, the nitrogen supersaturated austenite solid solution strengthened layer that can obtain the high hardness about thickness 10 μ m in 60～120 minutes.

Compared with prior art, the present invention has following characteristics:

1, a compound reinforcement solid solution infiltration layer on rear cutting ferrule, hardness of this layer and wear resistance all have raising by a relatively large margin. and micro-penetration hardness reaches 1000HV, compares with the protocorm material, and wear resistance has improved 2～3 times, has improved the bite-resistant ability greatly.

2, strengthening the solid solution infiltration layer is nitriding layer or carburized case, utilizes the low pressure plasma glow discharge technique that Austenitic Stainless Steel is carried out low temperature nitriding, Carburization Treatment.Austenitic Stainless Steel after the processing belongs to a kind of do not have the nitrogen that chromium nitride and chromium carbide separate out or the supersaturated solid solution of carbon. and supersaturation nitrogen in this infiltration steel or carbon cause that the austenite lattice distorts, and make the hardness of infiltration layer and wear resistance that by a relatively large margin raising all be arranged.

3, strengthening the solid solution infiltration layer is carbonitrided case, because the maximum nitrogen content in the Austenitic Stainless Steel infiltration layer after handling appears at the different degree of depth respectively with maximum carbon content, the high hardness that existing ion nitriding is handled has the high permeability formation thickness of ion carburizing, glowdischarge carburizing processing and good hardness gradient again.

4, the tapering of the back card body front end conical surface is 60～80 °, the acting surface camber face of rear end and pipe coupling nut, and the point of action of control force is at the center of surface of contact.

5, at low pressure 100～150Pa, carrying out Austenitic Stainless Steel surface carburization, carburizing or carbonitriding under 300～450 ℃ of conditions of low temperature handled 60～120 minutes, can form wear resistance height, surface reforming layer that corrosion resistance is good on Austenitic Stainless Steel surface, alloying layer thickness is 10～30 μ m, mechanical property improves, and hardness obviously strengthens.

Description of drawings

Fig. 1 is the structural representation of rear cutting ferrule of the present invention.

Fig. 2 is the partial enlarged drawing of Fig. 1.

Embodiment

Below in conjunction with accompanying drawing, the present invention is elaborated, card is the back card cutting ferrule of two yoke configurations behind the present invention, as shown in Figure 1, it comprises that front end is the back card body 1 of the conical surface, be compounded with one and strengthen solid solution infiltration layer 2 on card body 1 outer surface of described back, the thickness of strengthening solid solution infiltration layer 2 is 10～30 μ m, and strengthening solid solution infiltration layer 2 can be carburized case, nitriding layer or carbonitrided case.

The tapering of the back card body front end conical surface is 60～80 °, the rear end of back card body and the acting surface camber face of Female connector fittings, and the radius of arc shaped surface is R, sees Fig. 2.

Utilize the low pressure plasma glow discharge technique to strengthen sticking into capable nitrided surface between 300～450 ℃ after to Austenitic Stainless Steel, at pressure 100～150Pa, handle the nitrogen supersaturated austenite solid solution strengthened layer of the high hardness that can obtain in 60～120 minutes about thickness 10～30 μ m. adopt X-ray diffraction, electron probe and Auger spectrometer etc. that infiltration layer is carried out structural analysis and show, when treatment temperature is lower than 450 ℃, infiltration layer is single-phase nitrogen supersaturated austenite solid solution layer, micro-penetration hardness reaches 1000HV, compare with the protocorm material, wear resistance has improved 2～3 times.

Utilize the low pressure plasma glow discharge technique sticking into capable rapid carburization surface peening after to Austenitic Stainless Steel between 300～450 ℃, at pressure 100～150Pa, handle the carbon supersaturated austenite solid solution strengthened layer of the high hardness that can obtain in 60～120 minutes about thickness 10～30 μ m. adopt X-ray diffraction, electron probe and Auger spectrometer etc. carry out structural analysis to infiltration layer and show, when treatment temperature is lower than 450 ℃, infiltration layer is single-phase carbon supersaturated austenite solid solution layer, micro-penetration hardness reaches 900HV, compare with the protocorm material, wear resistance improves, and the bite-resistant performance improves.

Utilize the low pressure plasma glow discharge technique sticking into the quick carbonitriding of row between 300～450 ℃ after to Austenitic Stainless Steel, pressure is 100～150Pa, handle the carbon and the nitrogen supersaturated austenite solid solution strengthened layer that can obtain the high hardness about thickness 10～30 μ m in 60～120 minutes, Austenitic Stainless Steel after the processing belongs to a kind of do not have the nitrogen that chromium nitride and chromium carbide separate out and the supersaturated solid solution of carbon. and supersaturation nitrogen in this infiltration steel and carbon cause that the austenite lattice distorts, and make the hardness of infiltration layer and wear resistance that by a relatively large margin raising all be arranged.

Claims

1, a kind of heat treatment method of pipe joint rear cutting ferrule, comprise that front end is the back card body (1) of the conical surface, on described back card body (1), be compounded with one and strengthen solid solution infiltration layer (2), it is characterized in that at pressure 100～150Pa, under 300～450 ℃ of the temperature back card body (1) is carried out carburizing, nitriding or carbonitriding and handle 60～120 minutes time.