CN106702313A - Low temperature ion hardening treatment device of austenitic stainless steel long and thin tube - Google Patents
Low temperature ion hardening treatment device of austenitic stainless steel long and thin tube Download PDFInfo
- Publication number
- CN106702313A CN106702313A CN201611239910.0A CN201611239910A CN106702313A CN 106702313 A CN106702313 A CN 106702313A CN 201611239910 A CN201611239910 A CN 201611239910A CN 106702313 A CN106702313 A CN 106702313A
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- temperature
- steel tube
- thermocouple
- stove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- 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)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a low temperature ion hardening treatment device of an austenitic stainless steel long and thin tube. The technical scheme of the low temperature ion hardening treatment device lies in that stainless steel tubes (10) to be treated are hung on a cathode disc (4) in a furnace; the cathode disc is connected to the negative pole of a DC power supply (2); the positive pole of the DC power supply is connected to a furnace shell, and ground protection is performed; a stainless steel tube (5) in which n+1 (n is the number of outer auxiliary heating areas) armored thermocouples is inserted is further hung on the cathode disc; the output ends of the armored thermocouples are connected with temperature control instruments (8) after being connected to a isolation amplifier (1); one of the thermocouples is inserted in the middle of the stainless steel tube (5) and used for adjusting the output power of the DC glow discharge power supply; the insertion depth of the rest of the n thermocouples is the same as the height of the outer auxiliary heating areas; the thermocouples, outer auxiliary heaters (7) outside the furnace shell (6), outer air coolers (9) and the temperature control instruments (8) form a temperature closed-loop control system; by controlling the temperature of the furnace wall, the stainless steel tubes in the furnace can be in good consistency in axial temperature.
Description
Technical field
The invention belongs to a kind of metal material surface ion chemical heat treatment device, more specifically it is a kind of for Austria
The low-temperature ion cure process device of family name's body stainless steel elongated tubular.
Background technology
Austenitic stainless steel has good corrosion resistance, is widely used in the industry such as oil, chemical industry, medicine, food
In.But, due to the hardness of austenitic stainless steel low (~230HV), wear no resistance, so with the machine of austenite stainless steel making
Tool part, especially is just difficult to meet use requirement in the wear-resisting part of some needs, greatly reduces these machine components
Mechanical performance and service life.
In order to improve the hardness and wearability of austenite stainless steel surface, traditional method is entered at a temperature of~550 DEG C
Row glow discharge nitriding, makes austenite stainless steel surface form one layer of hardened layer containing CrN, and the table of austenitic stainless steel is improved with this
Surface hardness and wearability.But, by the stainless steel surfaces hardened layer after~550 DEG C of High temperature ion nitridings, free Cr's contains
The amount amount containing Cr minimum less than stainless steel is greater than 13% basic demand, although so after austenitic stainless steel High temperature ion nitriding
The hardness of stainless steel surfaces is improve, but reduces the corrosion resisting property of stainless steel surfaces.
From last century the eighties, foreign study personnel have found that austenitic stainless steel can be oozed at low temperature successively
The Surface hardening treatment of nitrogen, carburizing and nitrocarburizing, in a certain temperature ranges (420 DEG C~450 DEG C of nitriding, 450 DEG C of carburizing
~550 DEG C, 420 DEG C~450 DEG C of nitrocarburizing), nitrogen or (and) carbon atom can penetrate into the inside of austenitic stainless steel, in Ovshinsky
Body stainless steel surfaces formed one layer of nitrogen or (and) supersaturated solid solution of carbon, do not have the nitride of chromium or (and) Carbide Precipitation,
Can thus realize being increased substantially on the premise of stainless steel surfaces corrosion resisting property is not reduced the surface of austenitic stainless steel
Hardness and wearability.
The technological parameter of austenitic stainless steel hardening at subcritical temerature treatment most critical is treatment temperature, if treatment temperature is higher than upper
Limit temperature, just has chromium nitride in hardened layer or chromium carbide is separated out, and declines stainless steel pipe surface corrosion resisting property；If treatment temperature
Degree is relatively low, can cause that hardened layer is thin and infiltration rate is excessively slow.
The method of current austenitic stainless steel hardening at subcritical temerature treatment mainly has at plasma Chemical heat-treatment method, aerochemistry heat
Three kinds of logos and salt bath thermo-chemical treatment method.Wherein, plasma Chemical heat-treatment method have that processing speed is fast, hardened layer quality is high,
Pollution-free the advantages of.But, plasma Chemical heat-treatment technology there is also some more scabrous technical barriers, such as workpiece observing and controlling temperature
Workpiece temperature lack of homogeneity etc. in difficult and stove, stove sizes are bigger, and temperature homogeneity is poorer.
The ion chemical heat treatment appts of current China's production are all water-cooled (cold wall type) furnace bindings, workpiece be lean on from
Son bombardment is heated to thermo-chemical treatment temperature.By furnace binding and Ions Bombardment heating feature influenceed, in stove workpiece axially and
Radial temperature difference is larger, it is impossible to the need for meeting the austenitic stainless steel ionic hardening treatment of elongated tubular surface low-temperature.
The content of the invention
The invention aims to provide a kind of hot wall type ion chemical heat treatment device with outer auxiliary heating function,
For the low-temperature ion cure process of the elongated pipe surface of austenitic stainless steel, it can efficiently solve stainless steel elongated tubular in stove
Axially and radially the problem of poor temperature uniformity, improves the quality of stainless steel pipe surface hardening at subcritical temerature layer, and in processing procedure
Equipment and environment will not be polluted.
The object of the present invention is achieved like this：The processing unit is that had outside the stove of independent heating and refrigerating function by several
Auxiliary heater is constituted, and vacuum drying oven inner top fixes a cathode disc, and cathode disc connects with the negative pole of dc source, dc source
Anode connect stove outer covering, and ground protection.The austenitic stainless steel elongated tubular to be processed is suspended on cathode disc, wherein a pipe
Inside it is inserted with the armoured thermocouple equal with the outer auxiliary heater quantity of stove, the insertion depth of armoured thermocouple and corresponding outer auxiliary
Heater is on sustained height.
In the starting stage of austenitic stainless steel low-temperature ion cure process, first open outer auxiliary heater and will be taken out in stove
To vacuum, to hydrogen is passed through in stove after stainless steel tube is heated to a certain temperature, dc source is opened, stainless steel tube starts
Glow discharge.In the presence of glow discharge, stainless steel tube is continuously heating to close on hardening at subcritical temerature treatment temperature, at this moment can lead to
The outer auxiliary heater of thermocouple control stove in stove is crossed, until the temperature of all of armoured thermocouple reaches cure process temperature in stove
Degree, at this moment can initially enter Austria by technological requirement to the reacting gas such as a certain proportion of hydrogen, nitrogen, methane are passed through in stove
The holding stage of the low-temperature ion cure process of family name's body stainless steel tube.After the thickness of layer to be hardened reaches requirement, direct current is cut off
Source and source of the gas, stainless steel tube are cooled to low temperature in a vacuum, open bell and take out stainless steel tube.
The present invention has the advantage that：1. as a result of the hot wall type furnace binding with outer auxiliary heating function,
In processing procedure, furnace wall remains at temperature higher, reduces the temperature difference of workpiece radial direction in stove.2. by stove inner armor heat
The furnace wall temperature closed-loop control system that galvanic couple, outer auxiliary heater, outer air-cooler and temperature control instrument are collectively constituted, can be according to stove
The difference of the temperature that the actual temperature value of the interior a certain height of stainless steel tube needs with hardening process, it is automatic by temperature control instrument
Adjustment changes the furnace wall temperature of respective area, makes stainless steel tube axial temperature uniformity in stove.Although 3. stove inner armor thermocouple
Connect with the negative pole of DC high-voltage power supply, but because the line outlet in thermocouple has concatenated isolated amplifier, by DC high-voltage
Isolate with temperature control instrument, it is ensured that the security of control system and operator.
Brief description of the drawings
Accompanying drawing 1 is schematic structural view of the invention.
Describe in detail below in conjunction with the accompanying drawings according to specific device details proposed by the present invention and working condition.
(6) are the furnace shell of the plasma Chemical heat-treatment stove with outer auxiliary heater (7) in figure, and the austenite to be processed is not
Rust steel pipe (10) is suspended on stove inner cathode disk (4), and cathode disc connects with the negative pole of dc source (2), the positive pole of dc source
Connect furnace shell, and ground protection.One is also hung on cathode disc and is inserted with n+1 branch (quantity of n-outer auxiliary heating zone) armouring thermoelectricity
Even stainless steel tube (5), wherein master control thermocouple of 1 armoured thermocouple for the present apparatus, through isolated amplifier (1) and direct current
The control system in source connects, the power output for adjusting dc source, controls stainless steel tube Heated by Glow Discharge temperature；Other n branch
The insertion depth of armoured thermocouple is highly equal with outer auxiliary heating zone, and the outer exit of stove of armoured thermocouple is put by isolation
Big device (1) connects with temperature control instrument (8), the outer auxiliary heating-up temperature for controlling the region.If a certain area of stainless steel tube
Temperature exceedes a certain ceiling temperature, corresponding outer air-cooler (9) the meeting automatic in the area, by the temperature reduction stove for reducing furnace wall
Interior stainless steel tube this interval temperature.Working gas needed for plasma Chemical heat-treatment sends into vacuum by air supply system (3)
It is indoor.Vacuum system (11) ensures that plasma Chemical heat-treatment is carried out in certain pressure range.After cure process terminates,
All of outer air-cooler (9) is opened, workpiece in stove is down to low temperature.
Specific embodiment
Embodiment：Effective working size of austenitic stainless steel elongated tubular low-temperature ion cure process device of the present invention is φ
1100mm × 5000mm (diameter × height), the areas of Lu Waifen 6 heating, has hung 220 diameter phis 10mm, 4m long, wall thickness in stove
The AISI 316L Austenitic stainless steel pipes of 0.5mm, and one be inserted with 7 stainless steel tubes of armoured thermocouple, wherein 6 armours
Dress thermocouple controls the temperature of six area furnace walls, 1 power output for being used to control dc source.With hydrogen, nitrogen and methane gas
As the working gas of the ionitrocarburizing cure process of Austenitic stainless steel pipe.The stainless steel tube hanging that will be cleaned up exists
On cathode disc, bell forvacuum to 5Pa is covered, open outer auxiliary heater, stainless steel tube is heated to 300 DEG C, be passed through
1000mL/min hydrogen, opens dc source, and stainless steel tube starts glow discharge.When stainless steel tube is heated to 420 DEG C, according to
Six temperature in region of stainless steel tube just, the heating temperature of corresponding outer auxiliary heating zone are controlled by corresponding temp controlled meter in stove
Degree or cooling blower are consistent six area's temperature.For example, if stainless steel tube area temperature drift in stove, the outer of the area is started
Air-cooler reduces the casing temperature in the area；If the temperature in stainless steel tube area is relatively low, the outer auxiliary heater liter in the area is opened
The casing temperature in Gao Gai areas.After the area's temperature of stainless steel tube six is consistent in stove and reaches thermal balance, according to technological requirement in stove
Hydrogen, nitrogen and the methane gas of certain proportion and quantity are passed through, the holding stage of cure process is initially entered.It was incubated entirely
Cheng Zhong, still controls casing temperature, to ensure the axial temperature of the stainless steel tube in whole processing procedure by stove inner armor thermocouple
Uniformity.
Claims (3)
1. a kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular, including direct current glow discharge power supply (2), confession
Gas system (3), suspension stainless steel tube cathode disc (4), be inserted with the interior thermometric stainless steel tube (5) of armoured thermocouple, with outer auxiliary
Help the plasma Chemical heat-treatment stove of heater (7) furnace shell (6), it is outer auxiliary heating and temperature control instrument (8), outer air-cooler (9),
Vacuum system (11), it is characterised in that the stainless steel tube to be processed (10) is suspended on stove inner cathode disk (4), cathode disc and direct current
The negative pole of power supply (2) connects, and the positive pole of dc source connects furnace shell, and ground protection, one is also hung on cathode disc and is inserted with n+1 branch
The stainless steel tube (5) of (n is the quantity of outer auxiliary heating zone) armoured thermocouple, the output of thermocouple terminates isolated amplifier (1)
Connect with temperature control instrument (8) again afterwards, the outer outer auxiliary heater (7) of these thermocouples and furnace shell (6), outer air-cooler (9),
Temperature control instrument (8) etc. constitutes Cryocooler Temperature Closed Loop Control System, by controlling the temperature of furnace wall, makes the axial temperature of stainless steel tube in stove
It is consistent.
2. a kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular according to claim 1, its feature
It is middle part that a thermocouple is inserted in stainless steel tube as master control thermocouple, the output for adjusting direct current glow discharge power supply
Power, the temperature that the thermocouple shows is the technological temperature of austenitic stainless steel hardening at subcritical temerature treatment.
3. a kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular according to claim 1, its feature
It is the extraction termination isolated amplifier of thermocouple in stove, then connects with temp controlled meter again, it is low to prevent DC high-voltage from entering
Pressure control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611239910.0A CN106702313B (en) | 2016-12-29 | 2016-12-29 | A kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611239910.0A CN106702313B (en) | 2016-12-29 | 2016-12-29 | A kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106702313A true CN106702313A (en) | 2017-05-24 |
| CN106702313B CN106702313B (en) | 2019-04-19 |
Family
ID=58903008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611239910.0A Active CN106702313B (en) | 2016-12-29 | 2016-12-29 | A kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106702313B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114540747A (en) * | 2022-01-25 | 2022-05-27 | 北京科技大学 | Preparation device and application method of inner surface gradient reinforced steel pipe |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4828472A (en) * | 1983-12-16 | 1989-05-09 | Kawasaki Jukogyo Kabushiki Kaisha | Apparatus for molding and solidifying a resinous composite structure |
| JP2007125844A (en) * | 2005-11-07 | 2007-05-24 | Murata Mach Ltd | Apparatus for molding frp reinforcing tank |
| CN101289735A (en) * | 2008-06-14 | 2008-10-22 | 深圳八六三计划材料表面技术研发中心 | Precision hardening method and apparatus for austenitic stainless steel |
| CN102011087A (en) * | 2010-10-11 | 2011-04-13 | 青岛科技大学 | Ion chemical heat treating furnace having glow discharge-aided heating function |
| CN102234756A (en) * | 2011-06-21 | 2011-11-09 | 山东省潍坊生建机械厂（集团） | Novel glow ion nitriding equipment |
| CN106087620A (en) * | 2016-07-18 | 2016-11-09 | 四川大学 | A kind of Rail Surface online plasma cure device |
| CN206328451U (en) * | 2016-12-29 | 2017-07-14 | 青岛丰东热处理有限公司 | A kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular |
-
2016
- 2016-12-29 CN CN201611239910.0A patent/CN106702313B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4828472A (en) * | 1983-12-16 | 1989-05-09 | Kawasaki Jukogyo Kabushiki Kaisha | Apparatus for molding and solidifying a resinous composite structure |
| JP2007125844A (en) * | 2005-11-07 | 2007-05-24 | Murata Mach Ltd | Apparatus for molding frp reinforcing tank |
| CN101289735A (en) * | 2008-06-14 | 2008-10-22 | 深圳八六三计划材料表面技术研发中心 | Precision hardening method and apparatus for austenitic stainless steel |
| CN102011087A (en) * | 2010-10-11 | 2011-04-13 | 青岛科技大学 | Ion chemical heat treating furnace having glow discharge-aided heating function |
| CN102234756A (en) * | 2011-06-21 | 2011-11-09 | 山东省潍坊生建机械厂（集团） | Novel glow ion nitriding equipment |
| CN106087620A (en) * | 2016-07-18 | 2016-11-09 | 四川大学 | A kind of Rail Surface online plasma cure device |
| CN206328451U (en) * | 2016-12-29 | 2017-07-14 | 青岛丰东热处理有限公司 | A kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114540747A (en) * | 2022-01-25 | 2022-05-27 | 北京科技大学 | Preparation device and application method of inner surface gradient reinforced steel pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106702313B (en) | 2019-04-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205368433U (en) | Mesh belt furnace | |
| CN105506245A (en) | Mesh belt furnace and control method thereof | |
| CN106893947B (en) | A kind of preparation method for the bearing steel being resistant to 400 degree of high temperature | |
| CN107881303A (en) | Steel annealing process | |
| CN106702313B (en) | A kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular | |
| CN110284094B (en) | Preparation of high-temperature anticorrosive coating on boiler water-cooled wall and heat treatment synergistic enhancement technology of pipe matrix | |
| CN206328451U (en) | A kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular | |
| CN105695924B (en) | A kind of preparation method of nitrogenous austenitic stainless steel | |
| CN107806763B (en) | A kind of Gcr15 material surface strengthening treatment process and equipment | |
| CN103591793B (en) | A kind of vacuum sintering furnace | |
| CN106119511B (en) | 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical | |
| RU2456370C2 (en) | Method for steam-thermal oxydation of steel items and furnace for its implementation | |
| CN115522044B (en) | Invar wire heat treatment equipment and invar wire heat treatment method | |
| CN204281805U (en) | The process stove of a kind of surperficial high strength, high-wearing feature and high tenacity gear | |
| CN108728628A (en) | A kind of 9Cr18 steel large diameter thin wall bearing ring heat treatment method | |
| CN107779583A (en) | Seamless steel pipe Technology for Heating Processing | |
| RU2710176C1 (en) | Pass-through furnace for high-temperature treatment of carbon-fiber materials with induction heating of working zone | |
| CN108374078B (en) | A kind of heat treatment process of ceramics enhancing base steel composite material | |
| WO2023236135A1 (en) | Gcr15 material surface strengthening treatment process and equipment | |
| Kovács et al. | Effects of plasma nitriding on tempered steel | |
| CN205676513U (en) | A kind of vacuum heat treatment furnace for rod iron | |
| CN107723423A (en) | A kind of heat treatment quenching process of acid-resistant stainless steel precision component | |
| CN108570542A (en) | The manufacturing method of high-strength steel for oil well pipes | |
| CN104178609B (en) | A kind of vacuum drying oven | |
| CN106735243A (en) | Powder part Technology for Heating Processing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |