CN103834772A - Nitrogen gas quenching process for 25Cr2Ni4WA material - Google Patents
Nitrogen gas quenching process for 25Cr2Ni4WA material Download PDFInfo
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- CN103834772A CN103834772A CN201410083114.7A CN201410083114A CN103834772A CN 103834772 A CN103834772 A CN 103834772A CN 201410083114 A CN201410083114 A CN 201410083114A CN 103834772 A CN103834772 A CN 103834772A
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- quenching
- vacuum
- cooling
- 25cr2ni4wa
- vacuum oven
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Articles (AREA)
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
The present invention relates to a kind of 25Cr2Ni4WA material heat treatment process, particularly a kind of nitrogen quenching technology of 25Cr2Ni4WA material.
Background technology
In prior art, material is that certain firearms rifle handpiece body that 25Cr2Ni4WA, technical specifications are 44HRC～51HRC adopts oil quenching technique to heat-treat.Processing parameter is: well-type electric furnace heating, and Heating temperature is 870～890 DEG C, be 28～33 minutes heat-up time, oil cooling; Tempering adopts 180～240 DEG C of nitrate furnaces, is incubated 120 minutes.
Mainly there is following problem in what adopt this traditional technology:
1, this technique adopts protective atmosphere heating at well-type electric furnace, and piece surface is easily oxidized, decarburization;
2, this process using oil quenching, in this process, part needs to shift, and transfer action is large and follow stirring, causes part deformation large;
3, due to the easy decarburization of piece surface, oxidation, and distortion is large, therefore need after thermal treatment just can make part reach service requirements through multiple manufacturing procedure;
4, after quenching, part hardness is high, the post-treatment difficulty that causes quenching, and cutter consumption is large and efficiency is low;
5, parts quenching protective atmosphere methyl alcohol, propane and quenching oil are all big for environment pollution.
Summary of the invention
In prior art, material is 25Cr2Ni4WA product parts that certain firearms handpiece body adopts oil quenching thermal treatment process to obtain is oxidizable, decarburization, quenching strain is large, quenching post-treatment operation is many, processing difficulties, and technology for processing oil quenching is the technical problem to environment easily, the object of this invention is to provide one make this material parts non-oxidation, without decarburization, quenching strain is little, quenching post-treatment operation is few, handling ease, and the 25Cr2Ni4WA material nitrogen quenching technology of environmentally safe.
To achieve these goals, technical scheme of the present invention is:
A kind of 25Cr2Ni4WA material nitrogen quenching technology, comprises the following steps:
A, 25Cr2Ni4WA materials processing is become to finished part, detect relative dimensions and ensure that finished product is qualified;
B, by part on request disposing way pack in vacuum oven harness, send into vacuum oven with truck, start vacuum pump extracting vacuum, the vacuum degree control of vacuum oven is at≤13.3Pa; The preheating of part and the heating of quenching are carried out at vacuum state, reduce that part is oxidized, the possibility of decarburization; Meanwhile, heating under vacuum speed is slow, and thermal stresses is little, and part dilation is even, and piece surface light after thermal treatment keeps virgin metal gloss, and visual appearance is good;
C, 650～700 DEG C of insulation 30～40min of employing carry out preheating to part, eliminate the unrelieved stress of part machining process;
D, the heating of quenching, quenching temperature is 870～890 DEG C, insulation 150～180min;
E, adopt nitrogen cooling, cooling pressure is 2 × 10
5～3 × 10
5pa; Adopt air cooling, part is cooling evenly, is out of shape little; Meanwhile, the cooling pollution having reduced environment of nitrogen;
F, detect part relative dimensions and meet after Product Process requirement, in vacuum oven, part is carried out to temper, the vacuum degree control of vacuum oven is at≤13.3Pa; Tempering adopts nitrogen protection convective heating, and tempering temperature is 200～240 DEG C, insulation 180～210min;
Part after g, temper adopts nitrogen cooling, and cooling pressure is 2 × 10
5～3 × 10
5pa.
Useful technique effect of the present invention is:
1, adopt vacuum anaerobic type of heating, part non-oxidation after treatment, without decarburization; Meanwhile, heating under vacuum speed is slow, and thermal stresses is little, and part expands, shrinks evenly, and piece surface light after thermal treatment keeps virgin metal gloss, and visual appearance is good;
2,25Cr2Ni4WA material hardening capacity is good, adopts gas quenching, and part is cooling evenly, and part is without transfer, and quenching strain is little;
3, because piece surface visual appearance is good and it is little to be out of shape, part quenches after can being processed into finished product, has reduced the manufacturing procedure of part after quenching;
4, quench cooled gas is nitrogen, environmentally safe;
5, use technique of the present invention, reduced greatly production cost, improved production efficiency.
Embodiment
Below the specific embodiment of the present invention is described in further details.
Embodiment mono-
A kind of 25Cr2Ni4WA material nitrogen quenching technology, comprises the following steps:
A, 25Cr2Ni4WA materials processing is become to finished part, detect part relative dimensions and ensure that finished product is qualified;
B, by part on request disposing way pack in vacuum oven harness, send into vacuum oven with truck, start vacuum pump extracting vacuum, the vacuum degree control of vacuum oven is at≤13.3Pa;
C, 650 DEG C of insulation 40min of employing carry out preheating to part, eliminate the unrelieved stress of part machining process;
D, the heating of quenching, quenching temperature is 870 DEG C, insulation 180min;
E, adopt nitrogen cooling, cooling pressure is 2 × 10
5pa;
F, detect part relative dimensions and meet after Product Process requirement, in vacuum oven, part is carried out to temper, the vacuum degree control of vacuum oven is at≤13.3Pa; Tempering adopts nitrogen protection convective heating, and tempering temperature is 200 DEG C, insulation 210min;
Part after g, temper adopts nitrogen cooling, and cooling pressure is 2 × 10
5pa.
Embodiment bis-
A nitrogen quenching technology for 25Cr2Ni4WA material, comprises the following steps:
A, 25Cr2Ni4WA materials processing is become to finished part, detect part relative dimensions and ensure that finished product is qualified;
B, by part on request disposing way pack in vacuum oven harness, send into vacuum oven with truck, start vacuum pump extracting vacuum, the vacuum degree control of vacuum oven is at≤13.3Pa;
C, 700 DEG C of insulation 30min of employing carry out preheating to part, eliminate the unrelieved stress of part machining process;
D, the heating of quenching, quenching temperature is 890 DEG C, insulation 150min;
E, adopt nitrogen cooling, cooling pressure is 3 × 10
5pa;
F, detect part relative dimensions and meet after Product Process requirement, in vacuum oven, part is carried out to temper, the vacuum degree control of vacuum oven is at≤13.3Pa; Tempering adopts nitrogen protection convective heating, and tempering temperature is 240 DEG C, insulation 180min;
Part after g, temper adopts nitrogen cooling, and cooling pressure is 3 × 10
5pa.
Embodiment tri-
A nitrogen quenching technology for 25Cr2Ni4WA material, comprises the following steps:
A, 25Cr2Ni4WA materials processing is become to finished part, detect part relative dimensions and ensure that finished product is qualified;
B, by part on request disposing way pack in vacuum oven harness, send into vacuum oven with truck, start vacuum pump extracting vacuum, the vacuum degree control of vacuum oven is at≤13.3Pa;
C, 680 DEG C of insulation 35min of employing carry out preheating to part, eliminate the unrelieved stress of part machining process;
D, the heating of quenching, quenching temperature is 880 DEG C, insulation 160min;
E, adopt nitrogen cooling, cooling pressure is 2.5 × 10
5pa;
F, detect part relative dimensions and meet after Product Process requirement, in vacuum oven, part is carried out to temper, the vacuum degree control of vacuum oven is at≤13.3Pa; Tempering adopts nitrogen protection convective heating, and tempering temperature is 220 DEG C, insulation 200min;
Part after g, temper adopts nitrogen cooling, and cooling pressure is 2.5 × 10
5pa.
After product tempering, through nitrogen cooling process, carry out physics and chemistry detection, be organized as tempered martensite, hardness HRC44～HRC47, meeting product hardness technical specifications is 44HRC～51HRC requirement.Through 15000 longevity tests of product, meet product design life requirements.Through this quenching technology product non-oxidation after treatment, without decarburization, quenching strain is little simultaneously, and quenching post-treatment operation is few, handling ease, and environmentally safe.Handpiece body fire accuracy through process heat of the present invention certain model firearms after treatment is high, has good reliability and work-ing life.And this quenching technology can be applicable to all middle-size and small-size parts quenching technique that 25Cr2Ni4WA material, hardness technical specifications are 44HRC～51HRC, and provide reference for similar material heat treatment.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (1)
1. a 25Cr2Ni4WA material nitrogen quenching technology, is characterized in that, comprises the following steps:
A, 25Cr2Ni4WA materials processing is become to finished part, detect part relative dimensions and ensure that finished product is qualified;
B, by part on request disposing way pack in vacuum oven harness, send into vacuum oven with truck, start vacuum pump extracting vacuum, the vacuum degree control of vacuum oven is at≤13.3Pa;
C, 650～700 DEG C of insulation 30～40min of employing carry out preheating to part, eliminate the unrelieved stress of part machining process;
D, the heating of quenching, quenching temperature is 870～890 DEG C, insulation 150～180min;
E, adopt nitrogen cooling, cooling pressure is 2 × 10
5～3 × 10
5pa;
F, detect part relative dimensions and meet after Product Process requirement, in vacuum oven, part is carried out to temper, the vacuum degree control of vacuum oven is at≤13.3Pa; Tempering adopts nitrogen protection convective heating, and tempering temperature is 200～240 DEG C, insulation 180～210min;
Part after g, temper adopts nitrogen cooling, and cooling pressure is 2 × 10
5～3 × 10
5pa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410083114.7A CN103834772A (en) | 2014-03-07 | 2014-03-07 | Nitrogen gas quenching process for 25Cr2Ni4WA material |
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|---|---|---|---|
| CN201410083114.7A CN103834772A (en) | 2014-03-07 | 2014-03-07 | Nitrogen gas quenching process for 25Cr2Ni4WA material |
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| CN103834772A true CN103834772A (en) | 2014-06-04 |
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|---|---|---|---|
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106011394A (en) * | 2016-06-03 | 2016-10-12 | 太仓市沪太热处理厂 | Heat treatment process adopting three-section type heating for metal workpiece |
| CN106119509A (en) * | 2016-08-31 | 2016-11-16 | 沈阳鼓风机集团齿轮压缩机有限公司 | The vacuum Asia wet of a kind of KMN material semi-open type 3 d impeller is quenched technique |
| CN106337108A (en) * | 2015-08-17 | 2017-01-18 | 东风精密铸造安徽有限公司 | Heat treatment method for reducing solder joint hardness of ductile cast iron processing surface |
| CN106929647A (en) * | 2017-04-25 | 2017-07-07 | 东莞市华兴隆模具钢材有限公司 | A kind of vacuum heat-treating method of mould steel |
| CN107674942A (en) * | 2017-09-29 | 2018-02-09 | 杭州杭刃工具有限公司 | The burning hot handling process of high speed steel screw tap screw die vacuum air-quenching |
| CN107674941A (en) * | 2017-09-29 | 2018-02-09 | 杭州杭刃工具有限公司 | The burning hot handling process of alloy tool steel bearing steel tap die vacuum oil quenching |
| CN115232931A (en) * | 2022-07-08 | 2022-10-25 | 江西洪都航空工业集团有限责任公司 | Anti-deformation control method for arc-shaped part vacuum quenching heat treatment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005113213A (en) * | 2003-10-08 | 2005-04-28 | Ntn Corp | Heat treatment system |
| CN102560037A (en) * | 2011-12-30 | 2012-07-11 | 豫西工业集团有限公司 | High-strength steel thin-wall piece vacuum thermal treatment process |
-
2014
- 2014-03-07 CN CN201410083114.7A patent/CN103834772A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005113213A (en) * | 2003-10-08 | 2005-04-28 | Ntn Corp | Heat treatment system |
| CN102560037A (en) * | 2011-12-30 | 2012-07-11 | 豫西工业集团有限公司 | High-strength steel thin-wall piece vacuum thermal treatment process |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106337108A (en) * | 2015-08-17 | 2017-01-18 | 东风精密铸造安徽有限公司 | Heat treatment method for reducing solder joint hardness of ductile cast iron processing surface |
| CN106011394A (en) * | 2016-06-03 | 2016-10-12 | 太仓市沪太热处理厂 | Heat treatment process adopting three-section type heating for metal workpiece |
| CN106119509A (en) * | 2016-08-31 | 2016-11-16 | 沈阳鼓风机集团齿轮压缩机有限公司 | The vacuum Asia wet of a kind of KMN material semi-open type 3 d impeller is quenched technique |
| CN106929647A (en) * | 2017-04-25 | 2017-07-07 | 东莞市华兴隆模具钢材有限公司 | A kind of vacuum heat-treating method of mould steel |
| CN107674942A (en) * | 2017-09-29 | 2018-02-09 | 杭州杭刃工具有限公司 | The burning hot handling process of high speed steel screw tap screw die vacuum air-quenching |
| CN107674941A (en) * | 2017-09-29 | 2018-02-09 | 杭州杭刃工具有限公司 | The burning hot handling process of alloy tool steel bearing steel tap die vacuum oil quenching |
| CN115232931A (en) * | 2022-07-08 | 2022-10-25 | 江西洪都航空工业集团有限责任公司 | Anti-deformation control method for arc-shaped part vacuum quenching heat treatment |
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Application publication date: 20140604 |