CN102943234A - Low-temperature salt bath nitriding process for Austenitic stainless steel workpiece - Google Patents
Low-temperature salt bath nitriding process for Austenitic stainless steel workpiece Download PDFInfo
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- CN102943234A CN102943234A CN2012104710509A CN201210471050A CN102943234A CN 102943234 A CN102943234 A CN 102943234A CN 2012104710509 A CN2012104710509 A CN 2012104710509A CN 201210471050 A CN201210471050 A CN 201210471050A CN 102943234 A CN102943234 A CN 102943234A
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Abstract
The invention relates to a low-temperature salt bath nitriding process for an Austenitic stainless steel workpiece. The low-temperature salt bath nitriding process is characterized in that nitriding salt for salt bath nitriding comprises, by weight, 10%-55% of KCNO, 5%-55% of NaCNO, 5%-15% of K2CO3, 5%-15% of Na2CO3, 1%-15% of LiCO3, 3%-20% of NaCl, 3%-20% of KCl, 0.1%-1% of Na2SO4, 0.01-0.5% of Na2S and 0.01-0.5% of K2S. The low-temperature salt bath nitriding process for the Austenitic stainless steel workpiece is characterized by comprising the steps of (1) cleaning, (2) drying preheating, (3) nitriding of the well preheated workpiece at 400-450 DEG C, (5) cooling, (6) cleaning and drying and (7) polishing. The low-temperature salt bath nitriding process has the advantages of not reducing corrosion resistance of Austenitic stainless steel and effectively improving superficial hardness, abrasion resistance and fatigue resistance.
Description
Technical field
The present invention relates to a kind of austenite stainless steel workpiece low temperature salt-bath nitriding process.
Background technology
The Salt-bath Nitriding Technology treatment technology is also referred to as the tufftride treatment technology, the activated nitrogen atom that utilizes the decomposition of cyanate radical and produce infiltrates workpiece, form the nitride layer of one deck densification at workpiece surface, thereby improve wear resistance, erosion resistance and the fatigue resistance of austenite stainless steel workpiece, so salt-bath nitriding is widely used in the production practice.But mainly be to utilize ion nitriding technology and a small amount of gas nitriding technique to austenite stainless steel workpiece cryogenic nitrogen metallization processes both at home and abroad.The present less Salt-bath Nitriding Technology that is applied to the austenite stainless steel workpiece.Summary of the invention
The purpose of invention is for a kind of austenite stainless steel workpiece nitriding process is provided, can so that after a kind of austenitic stainless steel nitrogenize its wear resistance greatly improve and so that the low temperature nitridation treatment method that solidity to corrosion also improves.
The present invention relates to a kind of austenite stainless steel workpiece low temperature salt-bath nitriding process, it is characterized in that being undertaken by following technical process:
Clean: the austenite stainless steel workpiece is placed in acetone or the alcohol medium, cleaned 15 minutes under 50 ℃ of left and right sides conditions with Ultrasonic Cleaners, to remove the workpiece surface greasy dirt;
Drying and forewarm: the austenite stainless steel workpiece that cleans up is dried in dryer, and about 300 ~ 350 ℃, carry out preheating 20 minutes;
Nitrogenize: the nitridation salt of special-purpose austenitic stainless steel low temperature salt-bath nitrogenize is put into crucible, and in 430 ℃ of-450 ℃ of nitriding furnaces, be heated to its thawing with fused solution, then preheated austenite stainless steel workpiece is put into corundum crucible and carried out nitrogenize 120 ~ 1200 minutes, the temperature in the nitriding furnace remains on 400 ~ 450 ℃; The technique of described austenitic stainless steel low temperature salt-bath nitrogenize, it is characterized in that the nitridation salt of salt-bath nitriding is grouped into by following one-tenth by weight percentage: KCNO 10% ~ 55%, and NaCNO 5% ~ 55%, K
2CO
35% ~ 15%, Na
2CO
35% ~ 15%, Li
2CO
31% ~ 15%, NaCl 3% ~ 20%, and KCl 3% ~ 20%, Na
2SO
40.1% ~ 1%, Na
2S 0.01-0.5%, K
2S 0.01-0.5%.
Cooling: after sample is come out of the stove, at room temperature be cooled to room temperature;
Clean and oven dry: after the cooling, with the salt of clear water flush away workpiece surface, and in dryer, dry with 80 ℃ of left and right sides temperature workpiece that nitrogenize is good;
Polishing: workpiece is polished at the vibrations polishing machine, remove the surface porosity layer.
The present invention adopts a kind of low temperature salt-bath nitriding process of austenitic stainless steel nitrogenize workpiece, uses specific nitridation salt, can effectively improve hardness, wear resistance, fatigue resistance and the solidity to corrosion of austenite stainless steel workpiece surface.
Description of drawings
Fig. 1 be behind the 321 austenite stainless steel workpiece cryogenic nitrogens the cross section metallograph.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, process program of the present invention is specifically described.
Embodiment 1
321 austenite stainless steel workpieces are placed in the acetone, cleaned 15 minutes under 50 ℃ of left and right sides conditions with Ultrasonic Cleaners, remove the workpiece surface greasy dirt, then with clear water workpiece is cleaned; Workpiece is dried in dryer, be put in interior about 300 ~ 350 ℃ of stove after the oven dry and carried out preheating 20 minutes; Then add the nitridation salt that nitrogenize is used in nitriding furnace in the crucible, it is characterized in that the nitridation salt of salt-bath nitriding is grouped into by following one-tenth by weight percentage: KCNO 25%, and NaCNO 25%, K
2CO
310%, Na
2CO
310%, Li
2CO
37%, NaCl 11.5%, and KCl 10.5%, and Na2SO4 0.5%.Na2S?0.025%，K2S?0.025%。Nitridation salt is heated to it melts fused solution in nitriding furnace, then preheated austenite stainless steel workpiece is put into crucible, the temperature in the nitriding furnace remains on 430 ℃ of nitrogenize 1200 minutes, during also frequently pass into oxygen; After 1200 minutes, workpiece is taken out, and place air to be cooled to room temperature; Workpiece that then will cooling is in a large amount of cleanings; In dryer, dry polishing with 80 ℃ of left and right sides temperature workpiece that nitrogenize is good.Obtain 321 austenitic stainless steel metallographics under the opticmicroscope.
Claims (5)
1. austenite stainless steel workpiece low temperature salt-bath nitriding process is characterized in that being undertaken by following technical process:
Clean: the austenite stainless steel workpiece is placed in acetone or the alcohol medium, cleaned 15 minutes under 50 ℃ of left and right sides conditions with Ultrasonic Cleaners, to remove the workpiece surface greasy dirt;
Drying and forewarm: the austenite stainless steel workpiece that cleans up is dried in dryer, and about 300 ~ 350 ℃, carry out preheating 20 minutes;
Nitrogenize: the nitridation salt of special-purpose austenitic stainless steel low temperature salt-bath nitrogenize is put into crucible, and in 430 ℃ of-450 ℃ of nitriding furnaces, be heated to its thawing with fused solution, then preheated austenite stainless steel workpiece is put into corundum crucible and carried out nitrogenize 120 ~ 1200 minutes, the temperature in the nitriding furnace remains on 430 ~ 450 ℃;
Cooling: after sample is come out of the stove, at room temperature be cooled to room temperature;
Clean and oven dry: after the cooling, with the salt of clear water flush away workpiece surface, and in dryer, dry with 80 ℃ of left and right sides temperature workpiece that nitrogenize is good;
Polishing: workpiece is polished at the vibrations polishing machine, remove the surface porosity layer.
2. by the technique of austenitic stainless steel low temperature salt-bath claimed in claim 1 nitrogenize, it is characterized in that the nitridation salt of salt-bath nitriding is grouped into by following one-tenth by weight percentage: KCNO 10% ~ 55%, and NaCNO 5% ~ 55%, K
2CO
35% ~ 15%, Na
2CO
35% ~ 15%, Li
2CO
31% ~ 15%, NaCl 3% ~ 20%, and KCl 3% ~ 20%, Na
2SO
40.1% ~ 1%, Na
2S 0.01-0.5%, K
2S 0.01-0.5%.
3. by the technique of austenitic stainless steel low temperature salt-bath claimed in claim 1 nitrogenize, it is characterized in that the nitridation salt of salt-bath nitriding is grouped into by following one-tenth by weight percentage: KCNO 25%, and NaCNO 25%, K
2CO
310%, Na
2CO
310%, Li
2CO
37%, NaCl 11.5%, and KCl 10.5%, Na
2SO
40.5%.
4.Na
2S?0.025%，K
2S?0.025%。
5. by the technique of austenitic stainless steel low temperature salt-bath claimed in claim 1 nitrogenize, it is characterized in that the temperature in the salt-bath nitriding Nitrogen During stove remains on 430 ~ 450 ℃.
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| CN2012104710509A CN102943234A (en) | 2012-11-20 | 2012-11-20 | Low-temperature salt bath nitriding process for Austenitic stainless steel workpiece |
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| CN2012104710509A CN102943234A (en) | 2012-11-20 | 2012-11-20 | Low-temperature salt bath nitriding process for Austenitic stainless steel workpiece |
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| CN102943234A true CN102943234A (en) | 2013-02-27 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106967945A (en) * | 2016-01-14 | 2017-07-21 | 杭州巨星科技股份有限公司 | Rare earth-sulfide for stainless steel urges the QPQ techniques for oozing low temperature QPQ compositions and stainless steel knife altogether |
| CN107794493A (en) * | 2017-11-16 | 2018-03-13 | 昆山三民涂赖电子材料技术有限公司 | A kind of salt bath formula and its salt-bath nitriding method of low temperature salt-bath nitridation |
| CN108251788A (en) * | 2018-01-11 | 2018-07-06 | 成都赛飞斯金属科技有限公司 | A kind of EMU braking steel back handled through tufftride and soft-nitriding treatment method |
| CN109423659A (en) * | 2017-08-25 | 2019-03-05 | 东莞新科技术研究开发有限公司 | The cleaning method of stainless steel work-piece |
| CN111500974A (en) * | 2020-04-30 | 2020-08-07 | 海门金锋盛厨房设备有限公司 | Salt bath nitriding system and nitriding method for wear-resistant and corrosion-resistant stainless steel |
| CN111809139A (en) * | 2020-07-13 | 2020-10-23 | 四川大学 | Low-temperature carbon nitrogen oxygen co-permeation treating agent for improving liquid metal corrosion resistance of stainless steel |
| CN111809140A (en) * | 2020-07-13 | 2020-10-23 | 四川大学 | Low-temperature carbon nitrogen oxygen co-cementation treating agent for improving hydrogen sulfide corrosion resistance of stainless steel |
| CN113106381A (en) * | 2020-12-28 | 2021-07-13 | 上海锐力医疗器械有限公司 | Salt bath nitriding formula and processing method of austenitic stainless steel medical suture needle |
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| CN1616704A (en) * | 2003-11-14 | 2005-05-18 | 上海欧本表面处理技术有限公司 | Salt bath tufftriding treatment of stainless steel (IICr17) slide vane (or vane) |
| CN101905420A (en) * | 2009-06-04 | 2010-12-08 | 台州市百达制冷有限公司 | Method for manufacturing special sliders for rotary compressors by adopting 9Cr18 or 9Cr18Mo stainless steel |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106967945A (en) * | 2016-01-14 | 2017-07-21 | 杭州巨星科技股份有限公司 | Rare earth-sulfide for stainless steel urges the QPQ techniques for oozing low temperature QPQ compositions and stainless steel knife altogether |
| CN109423659A (en) * | 2017-08-25 | 2019-03-05 | 东莞新科技术研究开发有限公司 | The cleaning method of stainless steel work-piece |
| CN107794493A (en) * | 2017-11-16 | 2018-03-13 | 昆山三民涂赖电子材料技术有限公司 | A kind of salt bath formula and its salt-bath nitriding method of low temperature salt-bath nitridation |
| CN108251788A (en) * | 2018-01-11 | 2018-07-06 | 成都赛飞斯金属科技有限公司 | A kind of EMU braking steel back handled through tufftride and soft-nitriding treatment method |
| CN111500974A (en) * | 2020-04-30 | 2020-08-07 | 海门金锋盛厨房设备有限公司 | Salt bath nitriding system and nitriding method for wear-resistant and corrosion-resistant stainless steel |
| CN111809139A (en) * | 2020-07-13 | 2020-10-23 | 四川大学 | Low-temperature carbon nitrogen oxygen co-permeation treating agent for improving liquid metal corrosion resistance of stainless steel |
| CN111809140A (en) * | 2020-07-13 | 2020-10-23 | 四川大学 | Low-temperature carbon nitrogen oxygen co-cementation treating agent for improving hydrogen sulfide corrosion resistance of stainless steel |
| CN113106381A (en) * | 2020-12-28 | 2021-07-13 | 上海锐力医疗器械有限公司 | Salt bath nitriding formula and processing method of austenitic stainless steel medical suture needle |
| CN113106381B (en) * | 2020-12-28 | 2023-05-02 | 上海锐力医疗器械有限公司 | Salt bath nitriding formula of austenitic stainless steel medical suture needle and processing method thereof |
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Application publication date: 20130227 |