CN102409285A - Low-temperature salt bath hardening treatment method for austenitic stainless steel - Google Patents
Low-temperature salt bath hardening treatment method for austenitic stainless steel Download PDFInfo
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- CN102409285A CN102409285A CN2011103805013A CN201110380501A CN102409285A CN 102409285 A CN102409285 A CN 102409285A CN 2011103805013 A CN2011103805013 A CN 2011103805013A CN 201110380501 A CN201110380501 A CN 201110380501A CN 102409285 A CN102409285 A CN 102409285A
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Abstract
The invention discloses a low-temperature salt bath hardening treatment method for austenitic stainless steel, belonging to the field of surface treatment of austenitic stainless steel. The method comprises the following step of: performing salt bath hardening treatment on austenitic stainless steel at the temperature below 490 DEG C for 2-4 hours, wherein the salt bath contains CNO<->, K2CO3, Na2CO3, CO(NH2), Li2CO3 and other trace elements, and the mass concentration of the salt bath is controlled at 35-45 percent. The CNO<-> in the salt bath used in the method has relatively high reduction potential, so that surface hardening treatment can be performed on the austenitic stainless steel without performing depassivation pretreatment; by performing low-temperature salt bath hardening treatment on the austenitic stainless steel, a hardened layer with S phase structural characteristics can be obtained, and the surface hardness of the hardened stainless steel is four times that of a substrate; and the corrosion resistance of the austenitic stainless steel after low-temperature salt bath hardening treatment is higher than that of the austenitic stainless steel before low-temperature salt bath hardening treatment.
Description
Technical field
The present invention relates to a kind of austenitic stainless steel low temperature salt-bath hardening process, belong to the austenitic stainless steel field of surface treatment.
Background technology
Cr element in the austenitic stainless steel can be in air the extremely strong Cr of oxidized formation self-healing ability
2O
3Passive film is widely used in engineering materials so have extremely strong corrosion resisting property.The hardness that it is exactly this material that but there is a very tangible deficiency in austenitic stainless steel is not high; It is low to directly translate into surface hardness, wear resisting property, anti-fatigue performance; Had a strong impact on the use range and the work-ing life of austenitic stainless steel, at this moment just need carry out surface hardening and handle austenitic stainless steel.
It all is to adopt the way of nitriding, carburizing or carbonitriding to improve its surface hardness that austenitic stainless steel surface hardening is in the past handled, but because treatment temp is higher, often after setting treatment, causes the surface corrosion resistance performance to descend, and has lost the person's character of " stainless steel ".Last century early eighties; Z. people such as L. Zhang finds under a certain critical temperature, austenitic stainless steel to be carried out the low temperature nitriding; Make the supersaturated solid solution of the nitrogen of stainless steel surface formation, can under the prerequisite that does not reduce the stainless steel surface corrosion resisting property, increase substantially its surface hardness.Discovered afterwards, can obtain similar effects equally to austenitic stainless steel carburizing or carbonitriding at low temperatures.Austenitic stainless steel low-temperature stiffening treatment process mainly contains gas method, ion method at present.Gas method need be with HCl or NH before carrying out carburizing
4Cl removes the passive film of stainless steel surface, and this will serious environment pollution; Ion method is removed the passive film of stainless steel surface through ion bombardment; And nitrogen (carbon) infiltrated stainless steel surface, obtain not reduce the setting treatment of corrosion resisting property, but when ionitriding (carbon) in enormous quantities; Workpiece temperature in the stove is measured and temperature homogeneity all is difficult to control; Increased intractability, so although the research of austenitic stainless steel low-temperature ion setting treatment has the history of decades, the instance of industrial applications is few.
Summary of the invention
The present invention is directed to the deficiency of prior art, the austenitic stainless steel low temperature salt-bath hardening process that a kind of treatment facility and technology are simple, pollution is light, temperature is easy to control is provided.
The present invention realizes through following technical scheme:
A kind of austenitic stainless steel low temperature salt-bath hardening process carries out salt bath setting treatment 2-4 hour to austenitic stainless steel in temperature below 490 ℃; Contain CNO in the said salt bath
﹣, mass concentration is controlled at 35%-45%.
Said austenitic stainless steel low temperature salt-bath hardening process is characterized in that CN-salt bath O
﹣Mass concentration be 38%.
Said austenitic stainless steel low temperature salt-bath hardening process comprises K in the said salt bath
2CO
3, Na
2CO
3And CO (NH
2), mass percent is 4:2: (4-6).
Said austenitic stainless steel low temperature salt-bath hardening process is characterized in that: the Li that also comprises 5-8% in the said salt bath
2CO
3
Said austenitic stainless steel low temperature salt-bath hardening process is characterized in that: 480 ℃ of temperature austenitic stainless steel was carried out the salt bath setting treatment 3 hours.
Compared with prior art, the present invention has following characteristics:
1. because this tests the CNO in the used salt bath
﹣Have stronger reduction potential, austenitic stainless steel can realized the surface hardening processing without blunt pre-treatment of past.
2.316L the hardened layer that austenitic stainless steel can obtain to have S phase structure characteristic through the low temperature salt-bath setting treatment, stainless surface hardness is 4 times of matrix hardness after the setting treatment.
3. through higher after the low temperature salt-bath setting treatment than the corrosion resistance of austenitic stainless steels before the low temperature salt-bath setting treatment.
Description of drawings
Fig. 1 is the metallograph of the hardened layer of sample after the austenitic stainless steel low temperature salt-bath setting treatment of the present invention;
Fig. 2 is the XRD diffractogram of sample after the austenitic stainless steel low temperature salt-bath setting treatment of the present invention.
Embodiment
Adopt the austenitic stainless steel sample of AISI 316L, sample is of a size of 30mm * 20mm * 5mm.Before the test, sample with 240#, 400#, 600#, 800#, the polishing of 1000# silicon carbide paper and polishing, is used acetone and alcohol wash specimen surface respectively successively then.
Component 2 contains the CNO of mass concentration 40% in the salt bath
﹣, 20% K
2CO
3, 10%Na
2CO
3And 25%CO (NH
2), surplus is Li
2CO
3
Component 3 contains the CNO of mass concentration 45% in the salt bath
﹣, 20% K
2CO
3, 10%Na
2CO
3And 20%CO (NH
2), surplus is Li
2CO
3
Component 4 contains the CNO of mass concentration 38% in the salt bath
﹣, 20% K
2CO
3, 10%Na
2CO
3And 25%CO (NH
2), surplus is Li
2CO
3And other trace elements.
Embodiment 1: above-mentioned arbitrary component is carried out salt bath setting treatment 2-4 hour to austenitic stainless steel in temperature below 490 ℃.
Embodiment 2: above-mentioned arbitrary component is carried out salt bath setting treatment 3 hour to austenitic stainless steel in temperature below 490 ℃.
Embodiment 3: above-mentioned arbitrary component was carried out the salt bath setting treatment 3 hours 450 ℃ of temperature to austenitic stainless steel.
Said austenitic stainless steel low temperature salt-bath hardening process carried out the salt bath setting treatment 3 hours 480 ℃ of temperature to austenitic stainless steel.
Its performance is following after temperature is handled 3 hours to the sample low temperature salt-bath below 490 ℃:
As shown in Figure 1, from photo, can find out that hardened layer is white light tone, there are not the carbide of chromium or separating out of nitride, demonstrate than matrix metal and have higher corrosion resisting property.
As can be seen from Figure 2 the sample after the setting treatment has still kept the original face-centered cubic crystal structure of austenitic stainless steel, and does not have cenotype to generate.Compare with the austenitic stainless steel of unhardened processing, skew has taken place to low angle in (111) diffraction peak of the stainless steel hardened layer after the process low temperature salt-bath setting treatment, demonstrates typical S phase structure.Because S has still kept the original single phase structure of austenitic stainless steel mutually; Dissolve in nitrogen and carbon atom in the stainless steel and filled up the gap of defectives such as the inner crystal boundary of stainless steel, dislocation, so that the stainless steel surface after the setting treatment has better corrosion resisting property than matrix.
Because this tests the CNO in the used salt bath
﹣Have stronger reduction potential, can remove the passive film of stainless steel surface effectively,, realize stainless surface hardening processing so in this test, do not need the special blunt pre-treatment of going just can make N and C atom unhinderedly infiltrate stainless inside.
Claims (5)
1. an austenitic stainless steel low temperature salt-bath hardening process is characterized in that: below 490 ℃ austenitic stainless steel was carried out the salt bath setting treatment 2-4 hour in temperature; Contain CNO in the said salt bath
﹣, mass concentration is controlled at 35%-45%.
2. austenitic stainless steel low temperature salt-bath hardening process according to claim 1: it is characterized in that CN-salt bath O
﹣Mass concentration be 38%.
3. austenitic stainless steel low temperature salt-bath hardening process according to claim 1 or claim 2: comprise K in the said salt bath
2CO
3, Na
2CO
3And CO (NH
2), three's mass percent is 4:2: (4-6).
4. like the said austenitic stainless steel low temperature salt-bath of claim 3 hardening process, it is characterized in that: the Li that also comprises 5-8% in the said salt bath
2CO
3
5. like the said austenitic stainless steel low temperature salt-bath of claim 3 hardening process, it is characterized in that: austenitic stainless steel was carried out the salt bath setting treatment 3 hours 480 ℃ of temperature.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572200A (en) * | 2013-11-13 | 2014-02-12 | 南京医科大学 | Salt bath nitrocarburizing modifying method for surface of orthodontics arch wire |
| CN104060216A (en) * | 2014-06-12 | 2014-09-24 | 江苏海纳机电集团有限公司 | Salt-bath hardening treatment method for obtaining supersaturated solid solution from stainless steel surface |
| CN105463475A (en) * | 2015-12-15 | 2016-04-06 | 石家庄三环阀门股份有限公司 | Corrosion resistance method of bimetal corrugated expansion joint |
| 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 |
| CN108103436A (en) * | 2018-02-06 | 2018-06-01 | 济南沃德汽车零部件有限公司 | A kind of nitrocarburizing method for engine valve and its nitridation salt used |
| 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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| CN100425728C (en) * | 2005-12-05 | 2008-10-15 | 王锡良 | Metal chemical heat treatment nitrogen earbon oxygen multi-element copermeation method and its mitrogen carbon oxygen multielement copermeation agent formula |
| CN102220552A (en) * | 2011-06-07 | 2011-10-19 | 四川大学 | Nitriding salt for low-temperature salt-bath nitriding |
| CN102220553A (en) * | 2011-07-04 | 2011-10-19 | 四川大学 | Nitride salt for low temperature salt bath nitriding of stainless steel |
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2011
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Patent Citations (3)
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| CN100425728C (en) * | 2005-12-05 | 2008-10-15 | 王锡良 | Metal chemical heat treatment nitrogen earbon oxygen multi-element copermeation method and its mitrogen carbon oxygen multielement copermeation agent formula |
| CN102220552A (en) * | 2011-06-07 | 2011-10-19 | 四川大学 | Nitriding salt for low-temperature salt-bath nitriding |
| CN102220553A (en) * | 2011-07-04 | 2011-10-19 | 四川大学 | Nitride salt for low temperature salt bath nitriding of stainless steel |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572200A (en) * | 2013-11-13 | 2014-02-12 | 南京医科大学 | Salt bath nitrocarburizing modifying method for surface of orthodontics arch wire |
| CN104060216A (en) * | 2014-06-12 | 2014-09-24 | 江苏海纳机电集团有限公司 | Salt-bath hardening treatment method for obtaining supersaturated solid solution from stainless steel surface |
| CN105463475A (en) * | 2015-12-15 | 2016-04-06 | 石家庄三环阀门股份有限公司 | Corrosion resistance method of bimetal corrugated expansion joint |
| CN105463475B (en) * | 2015-12-15 | 2018-08-21 | 石家庄三环阀门股份有限公司 | A kind of corrosion resistant etching method of bimetallic bellow-type expansion joint |
| 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 |
| CN108103436A (en) * | 2018-02-06 | 2018-06-01 | 济南沃德汽车零部件有限公司 | A kind of nitrocarburizing method for engine valve and its nitridation salt used |
| 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: 20120411 |