CN109267001A - A kind of composite stainless steel nitridation process - Google Patents
A kind of composite stainless steel nitridation process Download PDFInfo
- Publication number
- CN109267001A CN109267001A CN201811492111.3A CN201811492111A CN109267001A CN 109267001 A CN109267001 A CN 109267001A CN 201811492111 A CN201811492111 A CN 201811492111A CN 109267001 A CN109267001 A CN 109267001A
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- Prior art keywords
- nitriding
- stainless steel
- workpiece
- glow discharge
- nitridation process
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/36—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
- C23C8/38—Treatment of ferrous surfaces
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/42—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions only one element being applied
- C23C8/48—Nitriding
- C23C8/50—Nitriding of ferrous surfaces
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a kind of composite stainless steel nitridation process, when carrying out Nitrizing Treatment to workpiece, first carry out glow discharge nitriding or salt bath nitriding, then carry out gas nitriding processing again；When workpiece surface is provided with aperture and antiseepage region, glow discharge nitriding processing first is carried out to workpiece, then carries out gas nitriding processing；Workpiece is first subjected to salt bath nitriding processing when workpiece can carry out whole nitriding, then carries out gas nitriding processing.The present invention uses composite stainless steel nitridation process, the passivating film of workpiece surface is first destroyed using glow discharge nitriding or salt bath nitriding, then gas nitriding is carried out again, it can be double by the batch of gas nitriding, process time reduces significantly, and working efficiency not only can be improved, and reduces cost, and alloying layer thickness, between 0.17-0.19MM, alloying layer thickness is uniform.
Description
Technical field
The present invention relates to a kind of composite stainless steel nitridation process.
Background technique
Stainless steel nitriding generallys use three kinds of glow discharge nitriding, gas nitriding and salt bath nitriding nitriding methods in the prior art,
These three nitriding methods have the defects that certain.
Glow discharge nitriding utilizes glow discharge phenomenon as a kind of of metal-surface strengthening, generates after nitrogenous gas is ionized
Nitrogen ion bombardment piece surface is heated and is nitrogenized, and obtains the plasma Chemical heat-treatment technique of surface carburization layer, generally applicable
In cast iron, carbon steel, steel alloy, stainless steel and titanium alloy etc..Part is remarkably improved material surface after glow discharge nitriding is handled
Hardness, makes it have high wearability, fatigue strength, resistance to corrosion and anti-burn property etc., but glow discharge nitriding will appear it is as follows
Defect:
。
Gas nitriding is directly to be input into NH3 gas in furnace, is kept for 20~100 hours, NH3 gas is made to be decomposed into state of atom
(N) gas and (H) gas and carry out Nitrizing Treatment, wear-resisting, corrosion-resistant compound layer is generated on the surface for making steel.Gas nitriding is because dividing
It solves NH3 and carries out nitriding low efficiency, therefore generally fixed selection is suitable for the steel grade of nitridation, such as contains Al, the nitridation member such as Cr, Mo
Element, otherwise nitrogenizing can not almost carry out.Especially for stainless steel part, its passivating film need to be destroyed, and conventional means means of destruction
It is energizer to be added, and these energizers are typically all the mixture of ammonium chloride and quartz sand, are urged during heating in furnace
Penetration enhancer decomposites HCl, and HCl gas can destroy the passivating film of stainless steel, and stainless steel nitriding just can be carried out, but wherein there is some lack
It falls into:
。
Salt bath nitriding is that processed workpiece first derusts, degreasing, after preheating again be placed in nitridation crucible in, be in crucible with
TF -1 is main salt agent, is warmed to 560~600 DEG C of several points of processing to a few hours, according to external force payload suffered by workpiece, and determines
Nitride layer depth, in processes, it is necessary to be passed through an air hose in crucible bottom and be decomposed into a certain amount of air nitridation salt agent
CN or CNO, diffusion to working surface make the N and a small amount of C and diffusion layer of 8~9%wt of workpiece surface outermost layer compound,
Nitrogen-atoms, which diffuses into the base α-Fe, makes steel part have more fatigue durability, due to the decomposition and consumption of CNO during nitridation, so constantly wanting
Salt agent composition is chemically examined in processing in 6~8 hours, to adjust air capacity or new salt agent to be added.Common processing defect is as follows:
。
Summary of the invention
The most commonly used is overcome glow discharge nitriding commonly used in the prior art, gas nitriding in the technical problem to be solved in the present invention
There is the phenomenon that apparent defect with salt bath nitriding, present applicant proposes a kind of composite stainless steel nitridation process.
A kind of composite stainless steel nitridation process when carrying out Nitrizing Treatment to workpiece, first carries out glow discharge nitriding or salt bath nitriding,
Then gas nitriding processing is carried out again.
Further, when workpiece surface is provided with aperture and antiseepage region, glow discharge nitriding processing first is carried out to workpiece, so
Laggard promoting the circulation of qi body Nitrizing Treatment.Preferably, at a high temperature of the working environment of glow discharge nitriding processing is 500-550 DEG C, isothermal holding
3-4h.It is furthermore preferred that not 540 DEG C of temperature of glow discharge nitriding processing.
Further, workpiece is first subjected to salt bath nitriding processing when workpiece can carry out whole nitriding, then carries out gas
Body Nitrizing Treatment.Preferably, at a high temperature of the working environment of salt bath nitriding processing is 500-550 DEG C, isothermal holding 3-
4h.Optimal, the temperature when salt bath nitriding is handled is 540 DEG C.
The beneficial effects obtained by the present invention are as follows being: the present invention uses composite stainless steel nitridation process, first uses glow discharge nitriding
Or salt bath nitriding destroys the passivating film of workpiece surface, then carries out gas nitriding again, it can be double by the batch of gas nitriding,
Process time reduces significantly, and working efficiency not only can be improved, and reduces cost, and alloying layer thickness be 0.17-0.19MM it
Between, alloying layer thickness is uniform.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described, it should be understood that preferred embodiment described herein is only used
In the description and interpretation present invention, it is not intended to limit the present invention.
Embodiment 1
Y1Cr13 martensitic stain less steel workpiece nitriding, a cylindrical body of middle with hole, the end face that technique requires as nitriding part,
Hole and periphery do not allow nitriding, and nitriding thickness needs 0.15-0.2MM.
If only carrying out particle nitriding, need to consider that the hot-spot in hole that is protected from of part aperture burns out part,
Glow discharge nitriding is carried out in the case where not covering aperture, part infiltration layer is very uneven after glow discharge nitriding.
Processing mode: being existed using glow discharge nitriding, makees to keep the temperature 3-4h, destroy surface at a high temperature of environment is 500-550 DEG C
Then passivating film carries out gas nitriding.
Effect and benefit: batch becomes 10000 from original 5000, and process time became 2 days from 4 days, infiltration layer
Between 0.17-0.19MM, completes to require and improve work efficiency and reduce cost.
Embodiment 2
SUS310S austenite stainless steel washer nitriding, product thickness are the disk of 1MM diameter phi 15MM middle with hole, and processing is wanted
It asks as nitriding with a thickness of 0.1MM or more and the whole nitriding of needs.
Need whole nitriding to exclude using glow discharge nitriding, gas nitriding needs plus energizer, using energizer can block into
Tracheae corrodes inner wall and part；Using salt bath nitriding, normally in salt bath treatment process, entire process time reaches 7 days,
As long as the middle salt bath nitriding time is just up to 5 days, and regenerant salt in discontinuity detection high temperature salting liquid is needed in this treatment process
With the ratio of base salt, a certain proportion of bending is presented in part after processing.
Processing mode: first using salt bath nitriding, at a high temperature of working environment is 500-550 DEG C, 3-4h is kept the temperature, destroys surface
Passivating film, then carry out gas nitriding.
Effect and benefit: process time shorten to 4 days from original 7 days, improved working efficiency.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (7)
1. a kind of composite stainless steel nitridation process, which is characterized in that workpiece carry out Nitrizing Treatment when, first carry out glow discharge nitriding or
Then salt bath nitriding carries out gas nitriding processing again.
2. composite stainless steel nitridation process as described in claim 1, which is characterized in that when workpiece surface is provided with aperture and prevents
When seeping region, glow discharge nitriding processing first is carried out to workpiece, then carries out gas nitriding processing.
3. composite stainless steel nitridation process as claimed in claim 2, which is characterized in that the work of the glow discharge nitriding processing
At a high temperature of environment is 500-550 DEG C, isothermal holding 3-4h.
4. composite stainless steel nitridation process as claimed in claim 2, which is characterized in that the work of the glow discharge nitriding processing
Environment is 540 DEG C.
5. composite stainless steel nitridation process as described in claim 1, which is characterized in that when workpiece can carry out whole nitriding
Workpiece is first subjected to salt bath nitriding processing, then carries out gas nitriding processing.
6. the composite stainless steel nitridation process as described in right wants 4, which is characterized in that the building ring of the salt bath nitriding processing
At a high temperature of border is 500-550 DEG C, isothermal holding 3-4h.
7. the composite stainless steel nitridation process as described in right wants 5, which is characterized in that the salt bath nitriding processing when temperature be
540℃。
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| CN201811492111.3A CN109267001A (en) | 2018-12-07 | 2018-12-07 | A kind of composite stainless steel nitridation process |
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| CN201811492111.3A CN109267001A (en) | 2018-12-07 | 2018-12-07 | A kind of composite stainless steel nitridation process |
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| CN109267001A true CN109267001A (en) | 2019-01-25 |
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| CN201811492111.3A Pending CN109267001A (en) | 2018-12-07 | 2018-12-07 | A kind of composite stainless steel nitridation process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109881144A (en) * | 2019-01-31 | 2019-06-14 | 安徽省鑫矿液压机械有限责任公司 | A kind of surface nitrocarburizing heat treatment process of coal mine machinery bearing steel material |
Citations (3)
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|---|---|---|---|---|
| CN102747316A (en) * | 2012-07-30 | 2012-10-24 | 鹰普航空零部件（无锡）有限公司 | Salt bath nitriding pre-treatment and gas nitriding complex heat treatment process of anti-corrosion stainless steel parts |
| CN105525192A (en) * | 2015-12-14 | 2016-04-27 | 浙江海洋学院 | Anti-corrosion stainless steel plate for boat anchor and production method thereof |
| CN105937018A (en) * | 2016-06-27 | 2016-09-14 | 温州兰理工科技园有限公司 | Low temperature ion nitriding method for austenitic stainless steel |
-
2018
- 2018-12-07 CN CN201811492111.3A patent/CN109267001A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747316A (en) * | 2012-07-30 | 2012-10-24 | 鹰普航空零部件（无锡）有限公司 | Salt bath nitriding pre-treatment and gas nitriding complex heat treatment process of anti-corrosion stainless steel parts |
| CN105525192A (en) * | 2015-12-14 | 2016-04-27 | 浙江海洋学院 | Anti-corrosion stainless steel plate for boat anchor and production method thereof |
| CN105937018A (en) * | 2016-06-27 | 2016-09-14 | 温州兰理工科技园有限公司 | Low temperature ion nitriding method for austenitic stainless steel |
Non-Patent Citations (1)
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| 李志明等: "快速渗氮工艺的最新进展", 《热处理技术与装备》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109881144A (en) * | 2019-01-31 | 2019-06-14 | 安徽省鑫矿液压机械有限责任公司 | A kind of surface nitrocarburizing heat treatment process of coal mine machinery bearing steel material |
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Application publication date: 20190125 |
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