CN109972076A - A kind of precision stainless steel tube surfaces ion Plasma Nitriding Treatment process - Google Patents
A kind of precision stainless steel tube surfaces ion Plasma Nitriding Treatment process Download PDFInfo
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- CN109972076A CN109972076A CN201711465404.8A CN201711465404A CN109972076A CN 109972076 A CN109972076 A CN 109972076A CN 201711465404 A CN201711465404 A CN 201711465404A CN 109972076 A CN109972076 A CN 109972076A
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- aura
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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
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention belongs to stainless steel pipe technical field of surface, more particularly to a kind of precision stainless steel tube surfaces ion Plasma Nitriding Treatment process, purpose is to solve the problems, such as Stainless Steel Cladding surface carburization technological gap in C&P systems, to improve nuclear power fuel element manufacturing industry chain.The present invention is tested by the nitridation process repeatedly of 39 heats, low temperature nitridation process route and technological parameter are determined, through requiring to carry out technology detection to stainless steel pipe surface carburization layer according to product technology condition (achievement separately declares invention), and the practical of every technical performance index has been carried out with French nitriding pipe material object and has been compared, the size of nitriding pipe, surface roughness, alloying layer thickness, compound layer phase structure and distribution, nitriding layer brittleness, nitriding layer is loose and the detection data of vein nitride and French nitriding pipe it is substantially suitable, nitriding layer corrosion resistance is better than French nitriding pipe.
Description
Technical field
The invention belongs to stainless steel pipe technical field of surface, and in particular to a kind of precision stainless steel tube surfaces from
Sub- nitrogenation treatment technology method.
Background technique
Nuclear power C&P systems are controlled and change in heap by adjusting its upper and lower position in fuel assembly guide pipe
Neutron population and neutron density, change the severe degree of nuclear reaction, to effectively control the operation power of nuclear reactor and urgent
Quick stopping chain reaction under operating condition.
Control rod (also known as absorbing rod) is the component part of most critical in C&P systems, and being typically designed service life is 15
Year, it must back and forth move up and down in the heap in-core of high temperature, high pressure when due to its work, therefore the antifriction on control rod surface and corrosion-resistant
Performance becomes the most important condition that C&P systems design and fabrication technology condition in million kilowatt nuclear power station requires.
Summary of the invention
Present invention aim to address Stainless Steel Cladding surface carburization technological gap problems in C&P systems, to complete
Kind nuclear power fuel element manufacturing industry chain.
The present invention is implemented as follows:
A kind of precision stainless steel tube surfaces ion Plasma Nitriding Treatment process, specifically comprises the following steps:
Step 1: it is checked before blow-on
1.1 according to inspection is put before the progress blow-on of " ion nitriding furnace point examines table " content, and point inspection content includes: cooling water current indicator
Rotation, external heat power regulating eqiupment open, required gas medium pressure, reserves；
1.2 use the sealing rubber ring and ring flange of clean calico wiping device；
1.3 are slowly declined to the workbench equipped with workpiece at sealing rubber ring, and ten seconds or so confirmation furnace bodies is kept to drop to
Minimum point；Whether contacted with general-purpose table look-up furnace body with workpiece；
Step 2: it vacuumizes
Pressure value is directly inputted, vacuum pump is opened and vacuumizes, is hunted leak after reaching setting pressure；
Step 3: external heat heating
Pipeline and furnace gas are replaced, external heat is carried out；After workpiece temperature reaches technological temperature, into aura heating rank
Section；
Step 4: aura heating
4.1 aura pay attention to observation aura color after opening, normal hydrogen airglow light should be blue and white, if aura become white,
Red or other colors check the exception of gas circuit immediately；
Every 30 ± 10min makes an inspection tour aura situation in furnace in 4.2 temperature-rise periods, finds arc discharge, aura non-uniform phenomenon
When handle in time, debug；
Every 60 ± 10min makes an inspection tour cooler-water temperature in 4.3 temperature-rise periods, is opened according to each position cooling water temperature water adjusting valve
It closes, to guarantee that observation window, furnace hearth plate each position cooling condition are good；
Before 4.4 holding stages start, nitrogen, hydrogen gas flow, vacuum degree are adjusted in technique claimed range, then
Be passed through methane into furnace, do not allow to leave work position during work, at any time processing trip, power off, cutting off the water, the thing that happens suddenly of stopping the supple of gas or steam
Part, and the normal operation of restorer as early as possible；
Step 5: heat preservation
Every 60 ± 20min carries out an inspection in 5.1 insulating processes, fills in " outer auxiliary heating type glow discharge nitriding furnace parameters
Patrol record "；
5.2 pay attention to the product upper and lower level temperature difference and aura difference in observation furnace, and aura should be uniformly steady in normal furnace during heat preservation
It is fixed；
5.3 observation temperature, pressure, flow heat preservation parameter simultaneously notice that it fluctuates situation；
Step 6: blowing out is cooling
6.1 blowing out modes 1
After heat preservation, if technique can close heater without special blowing out operation requirement, outer air-cooler is opened, is closed true
Sky pump
6.2 blowing out modes 2
Workpiece higher for deformation requirements, that is, need the workpiece of Slow cooling, after soaking time arrives, should maintain preset temperature
Angle value is constant, turns down gas medium flow, turns down voltage, turns duty ratio down and continue to aura；Drop workpiece band aura slowly
Temperature；After temperature reaches setting value or less, by program blowing out；
Step 7: product is come out of the stove
It unloads that water pipe on bell, anode and cathode be existing, thermocouple junction, furnace body is risen, blanking bench blanking is gone to；In product
It has to wear clean white gloves when coming out of the stove, it is ensured that the surface cleanness of product.
The beneficial effects of the present invention are:
The present invention is tested by the nitridation process repeatedly of 39 heats, has determined low temperature nitridation process route and technique ginseng
Number, through carrying out technology detection to stainless steel pipe surface carburization layer according to the requirement of product technology condition, (achievement separately declares hair
It is bright), and carried out the practical of every technical performance index with French nitriding pipe material object and compared, the size of nitriding pipe, rough surface
Degree, alloying layer thickness, compound layer phase structure and distribution, nitriding layer brittleness, nitriding layer be loose and the detection data of vein nitride
Substantially suitable with French nitriding pipe, nitriding layer corrosion resistance is better than French nitriding pipe.
Specific embodiment
Below with reference to embodiment, the present invention is described further.
A kind of precision stainless steel tube surfaces ion Plasma Nitriding Treatment process, specifically comprises the following steps:
It is checked before 1 blow-on
1.1 according to inspection is put before the progress blow-on of " ion nitriding furnace point examines table " content, and point inspection content includes: cooling water current indicator
Rotation, external heat power regulating eqiupment open, required gas medium pressure, reserves etc..
1.2 use the sealing rubber ring and ring flange of clean calico wiping device.
1.3 are slowly declined to the workbench equipped with workpiece at sealing rubber ring, and ten seconds or so confirmation furnace bodies is kept to drop to
Minimum point.Whether contacted with general-purpose table look-up furnace body with workpiece.
2 vacuumize
Pressure value is directly inputted, vacuum pump is opened and vacuumizes, is hunted leak after reaching setting pressure.
The heating of 3 external heats
Pipeline and furnace gas are replaced, external heat is carried out；After workpiece temperature reaches technological temperature, into aura heating rank
Section.
The heating of 4 aura
4.1 aura pay attention to observation aura color after opening, normal hydrogen airglow light should be blue and white, if aura become white,
Red or other colors check the exception of gas circuit immediately.
Every 30 ± 10min makes an inspection tour aura situation in furnace in 4.2 temperature-rise periods, and it is existing that discovery arc discharge, aura are uneven etc.
As when handle in time, debug.
Every 60 ± 10min makes an inspection tour cooler-water temperature in 4.3 temperature-rise periods, is opened according to each position cooling water temperature water adjusting valve
It closes, to guarantee that each position cooling condition such as observation window, furnace hearth plate is good.
Before 4.4 holding stages start, nitrogen, hydrogen gas flow, vacuum degree are adjusted in technique claimed range, then
It is passed through methane into furnace, does not allow to leave work position during work, handles the burst thing such as trip, power off, cutting off the water, stopping the supple of gas or steam at any time
Part, and the normal operation of restorer as early as possible.
5 heat preservations
Every 60 ± 20min carries out an inspection in 5.1 insulating processes, fills in " outer auxiliary heating type glow discharge nitriding furnace parameters
Patrol record ".
5.2 pay attention to the product upper and lower level temperature difference and aura difference in observation furnace, and aura should be uniformly steady in normal furnace during heat preservation
It is fixed.
The heat preservation parameters such as 5.3 observation temperature, pressure, flow simultaneously notice that it fluctuates situation.
6 blowing outs are cooling
6.1 blowing out modes 1 (vacuum cooled)
After heat preservation, if technique can close heater without special blowing out operation requirement, outer air-cooler is opened, is closed true
Sky pump.
6.2 blowing out modes 2 (aura blowing out)
Workpiece higher for deformation requirements, (workpiece for needing Slow cooling) after soaking time arrives, should maintain preset temperature
Angle value is constant, turns down gas medium flow, turns down voltage, turns duty ratio down and continue to aura.Drop workpiece band aura slowly
Temperature.After temperature reaches setting value or less, by program blowing out.
7 products are come out of the stove
It unloads that water pipe on bell, anode and cathode be existing, thermocouple junction, furnace body is risen, blanking bench blanking is gone to.In product
It has to wear clean white gloves when coming out of the stove, it is ensured that the surface cleanness of product.
Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, should all be in this hair
Within bright protection scope.
Claims (1)
1. a kind of precision stainless steel tube surfaces ion Plasma Nitriding Treatment process, specifically comprises the following steps:
Step 1: it is checked before blow-on
1.1 according to inspection is put before the progress blow-on of " ion nitriding furnace point examines table " content, and point inspection content includes: cooling water current indicator
Rotation, external heat power regulating eqiupment are opened, required gas medium pressure, reserves；
1.2 use the sealing rubber ring and ring flange of clean calico wiping device；
1.3 are slowly declined to the workbench equipped with workpiece at sealing rubber ring, keep ten seconds or so confirmation furnace bodies to drop to minimum
Point；Whether contacted with general-purpose table look-up furnace body with workpiece；
Step 2: it vacuumizes
Pressure value is directly inputted, vacuum pump is opened and vacuumizes, is hunted leak after reaching setting pressure；
Step 3: external heat heating
Pipeline and furnace gas are replaced, external heat is carried out；After workpiece temperature reaches technological temperature, into the aura temperature rise period；
Step 4: aura heating
4.1 aura pay attention to observation aura color after opening, normal hydrogen airglow light should be blue and white, if aura becomes white, red
Or other colors check the exception of gas circuit immediately；
Every 30 ± 10min makes an inspection tour aura situation in furnace in 4.2 temperature-rise periods, when finding arc discharge, aura non-uniform phenomenon and
When handle, debug；
Every 60 ± 10min makes an inspection tour cooler-water temperature in 4.3 temperature-rise periods, is switched according to each position cooling water temperature water adjusting valve,
To guarantee that observation window, furnace hearth plate each position cooling condition are good；
Before 4.4 holding stages start, nitrogen, hydrogen gas flow, vacuum degree are adjusted in technique claimed range, then to
Be passed through methane in furnace, do not allow to leave work position during work, at any time processing trip, power off, cutting off the water, emergency event of stopping the supple of gas or steam,
And the normal operation of restorer as early as possible；
Step 5: heat preservation
Every 60 ± 20min carries out an inspection in 5.1 insulating processes, fills in " outer auxiliary heating type glow discharge nitriding furnace parameters inspection
Record "；
5.2 pay attention to observation furnaces in the product upper and lower level temperature difference and aura difference, during heat preservation in normal furnace aura answer it is uniform and stable；
5.3 observation temperature, pressure, flow heat preservation parameter simultaneously notice that it fluctuates situation；
Step 6: blowing out is cooling
6.1 blowing out modes 1
After heat preservation, if technique can close heater without special blowing out operation requirement, outer air-cooler is opened, closes vacuum pump
6.2 blowing out modes 2
Workpiece higher for deformation requirements, that is, need the workpiece of Slow cooling, after soaking time arrives, should maintain preset temperature value
It is constant, gas medium flow is turned down, voltage is turned down, turns duty ratio down and continue to aura；Make workpiece band aura slow cooling；When
After temperature reaches setting value or less, by program blowing out；
Step 7: product is come out of the stove
It unloads that water pipe on bell, anode and cathode be existing, thermocouple junction, furnace body is risen, blanking bench blanking is gone to；It comes out of the stove in product
When have to wear clean white gloves, it is ensured that the surface cleanness of product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711465404.8A CN109972076A (en) | 2017-12-28 | 2017-12-28 | A kind of precision stainless steel tube surfaces ion Plasma Nitriding Treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711465404.8A CN109972076A (en) | 2017-12-28 | 2017-12-28 | A kind of precision stainless steel tube surfaces ion Plasma Nitriding Treatment process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109972076A true CN109972076A (en) | 2019-07-05 |
Family
ID=67075272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711465404.8A Pending CN109972076A (en) | 2017-12-28 | 2017-12-28 | A kind of precision stainless steel tube surfaces ion Plasma Nitriding Treatment process |
Country Status (1)
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| CN (1) | CN109972076A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942633A (en) * | 2010-09-20 | 2011-01-12 | 中煤邯郸煤矿机械有限责任公司 | Glow ion oxynitriding abrasion resisting technique for coal machine assembly |
| CN107385382A (en) * | 2017-08-31 | 2017-11-24 | 武汉武热研热处理科技有限公司 | Hot wall type ion nitriding and its application method in glow ion nitriding |
-
2017
- 2017-12-28 CN CN201711465404.8A patent/CN109972076A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942633A (en) * | 2010-09-20 | 2011-01-12 | 中煤邯郸煤矿机械有限责任公司 | Glow ion oxynitriding abrasion resisting technique for coal machine assembly |
| CN107385382A (en) * | 2017-08-31 | 2017-11-24 | 武汉武热研热处理科技有限公司 | Hot wall type ion nitriding and its application method in glow ion nitriding |
Non-Patent Citations (1)
| Title |
|---|
| 王文水等: ""辉光离子氮化的研究"", 《河北工学院学报》 * |
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| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190705 |
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| RJ01 | Rejection of invention patent application after publication |