CN206328451U - A kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular - Google Patents
A kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular Download PDFInfo
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- CN206328451U CN206328451U CN201621457933.4U CN201621457933U CN206328451U CN 206328451 U CN206328451 U CN 206328451U CN 201621457933 U CN201621457933 U CN 201621457933U CN 206328451 U CN206328451 U CN 206328451U
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- stainless steel
- temperature
- thermocouple
- steel tube
- stove
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Abstract
The utility model discloses a kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular; the stainless steel tube to be handled (10) is suspended on stove inner cathode disk (4); cathode disc connects with the negative pole of dc source (2); the positive pole of dc source connects furnace shell, and ground protection.Connect again with temperature control instrument (8) after a stainless steel tube (5) for being inserted with n+1 branch (n is the quantity of outer auxiliary heating zone) armoured thermocouple, the output termination isolated amplifier (1) of thermocouple are also hung on cathode disc.One thermocouple is inserted in the middle part of stainless steel tube, the power output for adjusting direct current glow discharge power supply；Remaining n branch thermocouple insertion depth is identical with the height of outer auxiliary heating zone, these thermocouples and outer auxiliary heater (7), outer air-cooler (9), the temperature control instrument (8) of furnace shell (6) outside etc. constitute Cryocooler Temperature Closed Loop Control System, by controlling the temperature of furnace wall, it is consistent the axial temperature of stainless steel tube in stove.
Description
Technical field
The utility model belongs to a kind of metal material surface ion chemical heat treatment device, and more specifically it is a kind of use
In the low-temperature ion cure process device of austenitic 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, greatly reduces these machine components in the wear-resisting part of some needs
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, is made austenite stainless steel surface one layer of hardened layer containing CrN of formation, the table of austenitic stainless steel is improved with this
Surface hardness and wearability.But, in the stainless steel surfaces hardened layer after~550 DEG C of High temperature ion nitridings, free Cr's contains
Amount is greater than 13% basic demand less than the minimum amount containing Cr of stainless steel, although so after austenitic stainless steel High temperature ion nitriding
The hardness of stainless steel surfaces is improved, 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 one layer of nitrogen of formation or (and) supersaturated solid solution of carbon, nitride without chromium or (and) Carbide Precipitation,
It can thus realize on the premise of stainless steel surfaces corrosion resisting property is not reduced, increase substantially the surface of austenitic stainless steel
Hardness and wearability.
The technological parameter of austenitic stainless steel hardening at subcritical temerature processing most critical is treatment temperature, if treatment temperature is higher than upper
Limit and chromium nitride or chromium carbide precipitation are just had in temperature, hardened layer, decline stainless steel pipe surface corrosion resisting property；If processing 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 processing mainly has plasma Chemical heat-treatment method, at 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, there is also some more scabrous technical barriers, such as workpiece observing and controlling temperature for plasma Chemical heat-treatment technology
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 ionic hardening processing of austenitic stainless steel elongated tubular surface low-temperature.
The content of the invention
The purpose of this utility model is to provide for a kind of hot wall type plasma Chemical heat-treatment with outer auxiliary heating function
Device, for the low-temperature ion cure process of the elongated pipe surface of austenitic stainless steel, it is thin that it can efficiently solve stainless steel in stove
The problem of axially and radially poor temperature uniformity of long tube, the quality of stainless steel pipe surface hardening at subcritical temerature layer is improved, and in processing
During equipment and environment will not be polluted.
What the purpose of this utility model was realized in：The processing unit is that have independent heating and refrigerating function by several
The outer auxiliary heater composition of stove, vacuum drying oven inner top fixes a cathode disc, and cathode disc connects with the negative pole of dc source, direct current
The anode of power supply connects stove outer covering, and ground protection.The austenitic stainless steel elongated tubular to be handled is suspended on cathode disc, wherein one
Be inserted with the armoured thermocouple equal with auxiliary heater quantity outside stove in root pipe, the insertion depth of armoured thermocouple with it is 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, hydrogen is passed through into 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 armoured thermocouple all in stove reaches cure process temperature
Degree, at this moment can be passed through the reacting gas such as a certain proportion of hydrogen, nitrogen, methane into stove by technological requirement, initially enter Austria
The holding stage of the low-temperature ion cure process of family name's body stainless steel tube.The thickness of layer to be hardened is reached after requirement, cuts off direct current
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 utility model has the following advantages：1. as a result of the hot wall type body of heater knot with outer auxiliary heating function
Structure, in processing procedure, furnace wall remains at higher temperature, reduces the temperature difference of workpiece radial direction in stove.2. by armour in stove
The furnace wall temperature closed-loop control system that dress thermocouple, outer auxiliary heater, outer air-cooler and temperature control instrument are collectively constituted, Ke Yigen
The difference of the temperature needed according to the actual temperature value of a certain height of stainless steel tube in stove with hardening process, passes through temperature control instrument
Adjust automatically changes the furnace wall temperature of respective area, makes stainless steel tube axial temperature uniformity in stove.Although 3. stove inner armor is warm
Galvanic couple connects with the negative pole of DC high-voltage power supply, but because the line outlet in thermocouple has concatenated isolated amplifier, direct current is high
Piezoelectricity is isolated with temperature control instrument, it is ensured that control system and the security of operator.
Brief description of the drawings
Accompanying drawing 1 is the utility model structural representation.
Below in conjunction with the accompanying drawings describe in detail according to the utility model proposes specific device details 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 handled 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 1 armoured thermocouple is the master control thermocouple of 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 equal with the height of 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, and corresponding outer air-cooler (9) the meeting automatic in the area reduces stove by the temperature for reducing furnace wall
This interval temperature of interior stainless steel tube.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 outer air-coolers (9) are opened, workpiece in stove is down to low temperature.
Embodiment
Embodiment：Effective working size of the utility model austenitic stainless steel elongated tubular low-temperature ion cure process device
For φ 1100mm × 5000mm (diameter × height), the areas of Lu Waifen 6 are heated, and 220 diameter phis 10mm, long 4m have been hung in stove,
Wall thickness 0.5mm AISI 316L Austenitic stainless steel pipes, and a stainless steel tube for being inserted with 7 armoured thermocouples, wherein 6
Branch armoured thermocouple controls the temperature of six area furnace walls, 1 power output for controlling dc source.With hydrogen, nitrogen and first
Alkane gas as the ionitrocarburizing cure process of Austenitic stainless steel pipe working gas.The stainless steel tube cleaned up is hung
Hang on cathode disc, cover bell forvacuum to 5Pa, open outer auxiliary heater, stainless steel tube is heated to 300 DEG C, lead to
Enter 1000mL/min hydrogen, open dc source, stainless steel tube starts glow discharge.When stainless steel tube is heated to 420 DEG C, root
According to six regions of stainless steel tube in stove temperature just, pass through the heating of the corresponding outer auxiliary heating zone of corresponding temp controlled meter control
Temperature or cooling blower are consistent six area's temperature.For example, if stainless steel tube area temperature drift in stove, the area is started
Outer air-cooler reduces the casing temperature in the area；If the temperature in stainless steel tube area is relatively low, the outer auxiliary heater in the area is opened
Raise the casing temperature in the area.After the area's temperature of stainless steel tube six is consistent in stove and reaches thermal balance, according to technological requirement to stove
Hydrogen, nitrogen and the methane gas of certain proportion and quantity are inside passed through, the holding stage of cure process is initially entered.Entirely it is being incubated
During, casing temperature is still controlled by stove inner armor thermocouple, to ensure the axially temperature of the stainless steel tube in whole processing procedure
Spend 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), hang 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 handled (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, which to be connect, also hung on furnace shell, and ground protection, cathode disc one and be inserted with n+1 branch
The stainless steel tube (5) of (n is the quantity of outer auxiliary heating zone) armoured thermocouple, the output termination isolated amplifier (1) of thermocouple
Connect again with temperature control instrument (8) 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 the 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 is shown is the technological temperature that austenitic stainless steel hardening at subcritical temerature is handled.
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 again with temp controlled meter, it is low to prevent DC high-voltage from entering
Pressure control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621457933.4U CN206328451U (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 |
|---|---|---|---|
| CN201621457933.4U CN206328451U (en) | 2016-12-29 | 2016-12-29 | A kind of low-temperature ion cure process device of austenitic stainless steel elongated tubular |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206328451U true CN206328451U (en) | 2017-07-14 |
Family
ID=59292876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621457933.4U Withdrawn - After Issue CN206328451U (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) | CN206328451U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106702313A (en) * | 2016-12-29 | 2017-05-24 | 青岛丰东热处理有限公司 | Low temperature ion hardening treatment device of austenitic stainless steel long and thin tube |
-
2016
- 2016-12-29 CN CN201621457933.4U patent/CN206328451U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106702313A (en) * | 2016-12-29 | 2017-05-24 | 青岛丰东热处理有限公司 | Low temperature ion hardening treatment device of austenitic stainless steel long and thin tube |
| CN106702313B (en) * | 2016-12-29 | 2019-04-19 | 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170714 Effective date of abandoning: 20190419 |
|
| AV01 | Patent right actively abandoned |