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Nitrogen gas quenching process for 25Cr2Ni4WA material

A technology of material processing and technology, which is applied in the field of nitrogen quenching technology, can solve the problems of easy pollution to the environment, many processing procedures, and easy oxidation of parts by oil quenching treatment technology, and achieve good appearance quality, reduced processing procedures, and bright surface Effect

Inactive Publication Date: 2014-06-04
CHONGQING JIANSHE IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the prior art, the product parts obtained by the oil quenching heat treatment process for a firearm head body made of 25Cr2Ni4WA are easy to oxidize and decarburize, and the quenching deformation is large. After quenching, there are many processing procedures and difficult processing, and the oil quenching process is easy The technical problem of causing pollution to the environment, the purpose of the present invention is to provide a kind of 25Cr2Ni4WA material nitrogen quenching that makes the material parts free of oxidation and decarburization, with small quenching deformation, few processing steps after quenching, easy processing, and no pollution to the environment craft

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of 25Cr2Ni4WA material nitrogen quenching process, comprises the following steps:

[0028] a. Process the 25Cr2Ni4WA material into finished parts, and check the relevant dimensions of the parts to ensure that the finished products are qualified;

[0029] b. Put the parts into the vacuum furnace equipment according to the required arrangement, send them into the vacuum furnace with a material truck, start the vacuum pump to extract the vacuum, and the vacuum degree of the vacuum furnace is controlled at ≤ 13.3Pa;

[0030] c. Use 650°C for 40 minutes to preheat the parts to eliminate the residual stress of the parts machining;

[0031] d. Quenching heating, the quenching heating temperature is 870°C, and the heat preservation is 180min;

[0032] e. Nitrogen cooling is used, and the cooling pressure is 2×10 5 Pa;

[0033] f. After detecting that the relevant dimensions of the parts meet the product process requirements, temper the parts in the vacuum furnace. The...

Embodiment 2

[0036] A kind of nitrogen quenching process of 25Cr2Ni4WA material, comprises the following steps:

[0037] a. Process the 25Cr2Ni4WA material into finished parts, and check the relevant dimensions of the parts to ensure that the finished products are qualified;

[0038] b. Put the parts into the vacuum furnace equipment according to the required arrangement, send them into the vacuum furnace with a material truck, start the vacuum pump to extract the vacuum, and the vacuum degree of the vacuum furnace is controlled at ≤ 13.3Pa;

[0039] c. Use 700°C for 30 minutes to preheat the parts to eliminate the residual stress of the parts machining;

[0040] d. Quenching heating, the quenching heating temperature is 890°C, and the heat preservation is 150min;

[0041] e. Nitrogen cooling is used, and the cooling pressure is 3×10 5 Pa;

[0042] f. After detecting that the relevant dimensions of the parts meet the product process requirements, temper the parts in the vacuum furnace. ...

Embodiment 3

[0045] A kind of nitrogen quenching process of 25Cr2Ni4WA material, comprises the following steps:

[0046] a. Process the 25Cr2Ni4WA material into finished parts, and check the relevant dimensions of the parts to ensure that the finished products are qualified;

[0047] b. Put the parts into the vacuum furnace equipment according to the required arrangement, send them into the vacuum furnace with a material truck, start the vacuum pump to extract the vacuum, and the vacuum degree of the vacuum furnace is controlled at ≤ 13.3Pa;

[0048] c. Use 680°C for 35 minutes to preheat the parts to eliminate the residual stress of the parts machining;

[0049] d. Quenching heating, the quenching heating temperature is 880°C, and the heat preservation is 160min;

[0050] e. Nitrogen cooling is used, and the cooling pressure is 2.5×10 5 Pa;

[0051] f. After detecting that the relevant dimensions of the parts meet the product process requirements, temper the parts in the vacuum furnace...

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PUM

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Abstract

The invention discloses a nitrogen gas quenching process for a 25Cr2Ni4WA material. The nitrogen gas quenching process comprises the following steps: a, processing a spare part into a finished product; b, loading the spare part into a vacuum furnace, controlling the vacuum degree at no more than 13.3Pa; c, keeping warm at 650-700 DEG C and preheating for 30-40 minutes; d, keeping warm at 870-890 DEG C for 150-180 minutes and quenching and heating; e, cooling by nitrogen, wherein the cooling pressure is 2*10<5> to 3*10<5>Pa; f, carrying out tempering after detecting that the related sizes of the spare part meet the technological requirements of the product, wherein the tempering temperature is 200-240 DEG C, and keeping warm for 180-210 minutes; and g, nitrogen cooling, wherein the cooling pressure is 2*10<5> to 3*10<5>Pa. The spare part processed by the technology disclosed by the invention is free of oxidation, free of decarburization, small in quenching deformation, fewer in manufacturing procedures after quenching, and easy to process, and the technology is free of pollution to environment.

Description

technical field [0001] The invention relates to a 25Cr2Ni4WA material heat treatment process, in particular to a nitrogen gas quenching process for the 25Cr2Ni4WA material. Background technique [0002] In the prior art, the body of a firearm whose material is 25Cr2Ni4WA and whose technical specification is 44HRC-51HRC is heat-treated by an oil quenching process. The process parameters are: heating in well-type electric furnace, heating temperature is 870-890°C, heating time is 28-33 minutes, oil cooling; tempering uses nitrate furnace at 180-240°C, heat preservation for 120 minutes. [0003] The following problems mainly exist in adopting this traditional craft: [0004] 1. The process adopts protective atmosphere heating in the well-type electric furnace, and the surface of the parts is easy to oxidize and decarburize; [0005] 2. The process adopts oil quenching. During this process, the parts need to be transferred, and the transfer action is large and accompanied by s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/74
CPCY02P10/20
Inventor 罗维刚刘高范红山梁恒院聂小炬
Owner CHONGQING JIANSHE IND GRP
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