CN101649441B - Process method for nitriding austenitic stainless steel material - Google Patents
Process method for nitriding austenitic stainless steel material Download PDFInfo
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- CN101649441B CN101649441B CN 200810068859 CN200810068859A CN101649441B CN 101649441 B CN101649441 B CN 101649441B CN 200810068859 CN200810068859 CN 200810068859 CN 200810068859 A CN200810068859 A CN 200810068859A CN 101649441 B CN101649441 B CN 101649441B
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Abstract
The invention aims to provide a method for nitriding an austenitic stainless steel material, which comprises a pretreatment process before nitriding the austenitic stainless steel material and a nitriding process. The pretreatment process before nitriding the austenitic stainless steel material is to clean a test piece with gasoline and anneal the test piece at a temperature of 810 DEG C for 2 hours. The nitriding process comprises the following steps: cleaning the test piece again with the gasoline or acetone, or blowing sands on the test piece with low wind pressure fine sands; then evenly mixing ammonia chloride and quartz sands in proportion, putting the mixture at the bottom of a nitriding box, adding the ammonia chloride into the nitriding box, putting the test piece on a material tray in the nitriding box, sealing the nitriding box, passing ammonia gas into the nitriding box, and pushing the nitriding box into a furnace when the ammonia decomposition rate is zero; and when the furnace temperature is between 595 and 605 DEG C, keeping the temperature for 10 to 20 hours, then raising the furnace temperature to between 620 and 645 DEG C or between 620 and 655 DEG C, continuously keeping the temperature for 10 to 20 hours, taking the nitriding box out from the furnace after finishing keeping the temperature, cooling the nitriding box in the air to a temperature less than or equal to 100 DEG C, detaching the nitriding box and then ending the nitriding process.
Description
Technical field
The present invention relates to the nitriding process of a kind of nitridation process, particularly stainless material, belong to the metal heat treatmet field.
Background technology
Nitridation process is widely used in ferrous materials, so that improve the wear resistance and the erosion resistance of part.But, for stainless material, the austenitic stainless steel that uses of aviation part particularly, owing to the homogeneity of structure of material and grain fineness number are required very high, so the nitriding treatment process that nitridation process is used to be similar to this austenitic stainless steel material of 1Cr18Mn8Ni5N still belongs to blank.
Summary of the invention
The purpose of this invention is to provide a kind of nitriding treatment process that is used for austenitic stainless steel material.
In order to guarantee to be had good comprehensive mechanical properties by the heart portion of nitrogenize part, reduce the dimensional change of part after the nitriding, guarantee the pre-treatment tissue that obtains and nitrogenize after nitride layer have good obdurability, to carry out anneal to material before the nitriding.Therefore the present invention includes austenitic stainless steel material is carried out pretreatment technology and nitrogenation treatment technology two portions before the nitrogenize.
1, the pretreatment technology before the nitriding was that the austenitic stainless steel test specimen is cleaned up with gasoline, puts into conventional oven, 810 ℃ of annealing temperatures 2 hours;
2, test specimen is cleaned up with gasoline or acetone once more, or blow sand with low blast fine sand;
3, with ammonium chloride and quartz sand according to weight 1:5 ratio uniform mixing, be placed on the nitriding box bottom, in nitriding box, add ammonium chloride then, its add-on is generally according to the nitriding box volume, by 80～100g/m
3
4, test specimen is put on the charging tray of nitriding box, the good seal nitriding box feeds ammonia, when ammonia dissociation rate is zero, nitriding box is pushed in the stove;
5, nitriding treatment when furnace temperature is 600 ± 5 ℃, is incubated 10～20 hours, and this moment, the rate of decomposition of ammonia was 50～65%;
6, furnace temperature is brought up to 620～650 ± 5 ℃, continued insulation 10～20 hours, this moment, the rate of decomposition of ammonia was 60～75%;
7, after insulation finishes, nitriding box is taken out from stove, be cooled in air≤100 ℃, devan, nitridation process finishes.
Continue the austenitic stainless steel test specimen that nitriding is handled according to technology of the present invention, the surface hardness of material can reach more than the 800HV, and depth of penetration is greater than 0.2mm, and material fragility is the I level.
Embodiment:
Be that the austenitic stainless steel test specimen of 1Cr18Mn8Ni5N carries out nitriding and handles to material below, 3 test specimens all are processed into the specification of Φ 10 * 20mm, put into common electric furnace, 810 ℃ of annealing temperatures 2 hours;
Test specimen 1 and 2 usefulness gasoline are cleaned, and test specimen 3 usefulness acetone clean, and dry up;
With 8g ammonium chloride and 390g quartz sand uniform mixing, be placed on the nitriding box bottom, in nitriding box, add 80g/m then
3Ammonium chloride.The vital role that adds ammonium chloride is to utilize it to decompose in nitriding furnace to produce HCI, removes the passive film of workpiece surface, and it promotes the effect that metal nitride forms in addition simultaneously;
Test specimen is put into respectively on the charging tray of nitriding box, the good seal nitriding box feeds ammonia, when ammonia dissociation rate is zero, nitriding box is pushed in the stove, adopts the processing parameter of following table to handle, and its effect is very good.
Practicality of the present invention is good, and technology is simple, is easy to promote, and can be applied to other and similarly contain on the steel such as high Cr, Mn, Ni, can be when using according to nitride layer depth, and different nitriding temperature, soaking time and ammonia dissociation rate are selected in the different requirements of hardness.
Claims (4)
1. the process method for nitriding of an austenitic stainless steel material, described material is the 1Cr18Mn8Ni5N austenitic stainless steel, comprises pretreatment technology and nitrogenation treatment technology two portions before the nitrogenize, it is characterized in that: technological process is
A. the austenitic stainless steel test specimen is cleaned up, put into conventional oven, 810 ℃ of annealing temperatures 2 hours;
B. test specimen is cleaned up once more, dry up;
C. with ammonium chloride and quartz sand according to 1: 5 ratio uniform mixing of weight ratio, be placed on the nitriding box bottom, in nitriding box, add ammonium chloride then, the add-on that adds ammonium chloride in the nitriding box is according to the nitriding box volume, by 80～100g/m
3Meter;
D. test specimen is put on the charging tray of nitriding box, the good seal nitriding box feeds ammonia, when ammonia dissociation rate is zero, nitriding box is pushed in the stove;
E. when furnace temperature is 600 ± 5 ℃, be incubated 10～20 hours;
F. furnace temperature is brought up to 620～650 ± 5 ℃, continued insulation 10～20 hours;
G. after insulation finishes, nitriding box is taken out from stove, in air, be cooled to≤100 ℃, devan.
2. the process method for nitriding of austenitic stainless steel material according to claim 1, it is characterized in that: test specimen cleans with gasoline or acetone, perhaps blows sand with low blast fine sand.
3. the process method for nitriding of austenitic stainless steel material according to claim 1, it is characterized in that: when nitriding treatment was 600 ± 5 ℃ in furnace temperature, the rate of decomposition of ammonia was 50～65%.
4. the process method for nitriding of austenitic stainless steel material according to claim 1, it is characterized in that: when nitriding treatment was 620～650 ± 5 ℃ in furnace temperature, the rate of decomposition of ammonia was 60～75%.
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| CN 200810068859 CN101649441B (en) | 2008-08-12 | 2008-08-12 | Process method for nitriding austenitic stainless steel material |
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| CN 200810068859 CN101649441B (en) | 2008-08-12 | 2008-08-12 | Process method for nitriding austenitic stainless steel material |
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| CN101649441A CN101649441A (en) | 2010-02-17 |
| CN101649441B true CN101649441B (en) | 2011-07-27 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942632B (en) * | 2010-09-21 | 2012-05-23 | 南京工业职业技术学院 | Gas nitriding process of 00Ni18Co8Mo5AlTi high-strength maraging steel |
| CN102732703A (en) * | 2012-07-18 | 2012-10-17 | 西安航空动力股份有限公司 | Method for improving strength of work piece formed by reforming austenitic stainless steel |
| CN103834904A (en) * | 2012-11-27 | 2014-06-04 | 大连经济技术开发区圣洁真空技术开发有限公司 | Anti-corrosion nitriding method for surface of workpiece |
| CN103088283B (en) * | 2013-01-06 | 2015-06-10 | 燕山大学 | Sectional type pressurizing solid solution nitriding accelerating method of austenitic stainless steel |
| CN104480424B (en) * | 2014-12-02 | 2017-02-22 | 贵州红林机械有限公司 | Method for nitriding nitrided steel 135 material |
| CN106637057B (en) * | 2016-12-21 | 2018-03-06 | 滨中元川金属制品（昆山）有限公司 | A kind of preparation technology of high-hardness stainless steel |
| CN107779810B (en) * | 2017-12-24 | 2019-04-19 | 中国航发贵州红林航空动力控制科技有限公司 | A kind of 4Cr14Ni14W2The technique of Mo heat resisting steel rapid ion nitriding |
| CN109055870A (en) * | 2018-08-24 | 2018-12-21 | 江苏华太电力仪表有限公司 | A kind of split-body valve hatpin valve stainless steel material and preparation method thereof |
| CN111500969A (en) * | 2020-04-30 | 2020-08-07 | 海门金锋盛厨房设备有限公司 | Nitriding treatment system and nitriding treatment method for oil-stain-resistant stainless steel |
| CN111663097A (en) * | 2020-06-17 | 2020-09-15 | 惠州濠特金属科技有限公司 | Austenitic nitriding process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084226A (en) * | 1992-09-16 | 1994-03-23 | 大同酸素株式会社 | The nitriding method of austenitic stainless steel products |
| CN1091780A (en) * | 1993-03-01 | 1994-09-07 | 大同酸素株式会社 | Nitrided stainless steel products |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084226A (en) * | 1992-09-16 | 1994-03-23 | 大同酸素株式会社 | The nitriding method of austenitic stainless steel products |
| CN1091780A (en) * | 1993-03-01 | 1994-09-07 | 大同酸素株式会社 | Nitrided stainless steel products |
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