CN108570535A - The experimental facilities and method of nitrogen blowing alloying under the conditions of a kind of stainless-steel vacuum - Google Patents
The experimental facilities and method of nitrogen blowing alloying under the conditions of a kind of stainless-steel vacuum Download PDFInfo
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- CN108570535A CN108570535A CN201810518784.5A CN201810518784A CN108570535A CN 108570535 A CN108570535 A CN 108570535A CN 201810518784 A CN201810518784 A CN 201810518784A CN 108570535 A CN108570535 A CN 108570535A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 230
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 115
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 76
- 239000010935 stainless steel Substances 0.000 title claims abstract description 74
- 238000007664 blowing Methods 0.000 title claims abstract description 54
- 238000005275 alloying Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title abstract description 15
- 238000002474 experimental method Methods 0.000 claims abstract description 38
- 229910006295 Si—Mo Inorganic materials 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000005086 pumping Methods 0.000 claims abstract description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 40
- 238000011010 flushing procedure Methods 0.000 claims description 25
- 239000010431 corundum Substances 0.000 claims description 24
- 229910052593 corundum Inorganic materials 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 21
- 229910052786 argon Inorganic materials 0.000 claims description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 229910002804 graphite Inorganic materials 0.000 claims description 19
- 239000010439 graphite Substances 0.000 claims description 19
- 239000011148 porous material Substances 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 11
- 239000012300 argon atmosphere Substances 0.000 claims description 6
- 239000003708 ampul Substances 0.000 claims description 5
- 239000010453 quartz Substances 0.000 claims description 5
- 239000000523 sample Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000004090 dissolution Methods 0.000 abstract 2
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000012856 packing Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 2
- 238000005352 clarification Methods 0.000 description 2
- 239000006101 laboratory sample Substances 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/005—Manufacture of stainless steel
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
Abstract
The experimental facilities and method of nitrogen blowing alloying, belong to metallurgical test device and method technical field under the conditions of a kind of stainless-steel vacuum, for carrying out the experiment of stainless steel nitrogen blowing alloying under vacuum.Its technical solution is：The experimental facilities of the present invention increases water cooling lid on the top of Si-Mo rod stove, water cooling lid is to be tightly connected with Si-Mo rod stove, water cooling has covered vacuum pumping holes, and vacuum pump can will be vacuumized by vacuum-pumping pipeline in Si-Mo rod stove, carries out the nitrogen blowing alloying operation experiments under vacuum state.The experimental method of the present invention finally obtains the stainless steel that nitrogen content is 0.05% 0.10%, and grasped the dissolution law and influence factor of nitrogen by controlling vacuum degree in stove and temperature, adjust nitrogen flow and nitrogen partial pressure.The present invention vacuumizes the requirement for reaching VOD stove vacuum degrees by vacuum pump, simulates actual production environment, solves the dissolution law of stainless steel nitrogen blowing alloying under vacuum condition, theoretical direction is provided for actual production.
Description
Technical field
The present invention relates to the experimental facilities and method of nitrogen blowing alloying under the conditions of a kind of stainless-steel vacuum, belong to metallurgical real
Test device and method technical field.
Background technology
Nitrogen is one of alloying element important in stainless steel.The nitrogen-contained stainless steel kind developed at present belongs to ultra-low carbon nitrogen
Type stainless steel and low-carbon control nitrogen type stainless steel, majority must pass through three-step approach（EAF+BOF/AOD+VOD）Technique is smelted, therefore complete
Kind Tri-step Steelmaking Process especially VOD refinery practices, improve VOD refining stainless steel nitrogen precision controllability be to ensure that it is honest and clean
Valence high-grade stainless steel kind production capacity and scale realize the important prerequisite promoted steadily.
Currently, widely having carried out the experimental work of nitrogen blowing alloying under non-vacuum condition in metallurgy industry, grasp
Rule of the nitrogen in stainless steel melt under non-vacuum condition, but the experimental method of nitrogen blowing alloying has no under vacuum
Report, in order to grasp rule of the nitrogen in stainless steel melt under vacuum condition, it is quite necessary to carry out nitrogen flushing under vacuum
The experiment of gas alloying provides theoretical direction for actual production.
Currently, the experimental facilities of well known stainless steel nitrogen blowing alloying is made of Si-Mo rod stove and nitrogen flushing tracheae, it is this
Equipment is suitable for the rule in antivacuum research stainless steel nitrogen blowing alloying.But in actual production, Hen Duohan
Nitrogen stainless steel is under vacuum conditions（VOD stoves）Production, the experimental facilities of general stainless steel nitrogen blowing alloying cannot be ground
Study carefully the rule of stainless steel nitrogen blowing alloying under vacuum condition, the stainless steel produced under the vacuum state that cannot be actual production is blown
Nitrogen alloying provides guidance, affects the progress and raising of stainless steel nitrogen blowing alloying levels.
In conclusion lacking research at present, the method for stainless steel nitrogen blowing alloy law and experiment are set under vacuum conditions
It is standby, it is quite necessary to which that the work for carrying out this respect provides section to study stainless steel nitrogen blowing alloy law under vacuum conditions
Learn to do section and technical support.
Invention content
Technical problem to be solved by the invention is to provide a kind of experiments of nitrogen blowing alloying under the conditions of stainless-steel vacuum
Device and method, this experimental facilities and method may be implemented to carry out nitrogen flushing alloying operation under vacuum condition, can study
Stainless steel nitrogen blowing alloy law under vacuum condition provides scientific basis to improve product quality.
Solving the technical solution of above-mentioned technical problem is：
The experimental facilities of nitrogen blowing alloying under the conditions of a kind of stainless-steel vacuum, it includes Si-Mo rod stove, and electricity is equipped in furnace body
It is to increase water cooling lid, water cooling lid on the top of Si-Mo rod stove to hinder stove, graphite protection crucible and corundum crucible, improvements
It is to be tightly connected with Si-Mo rod stove, water cooling, which covers respectively, vacuum pumping holes, vacuum meter hole, air-tight bottle hole, sampling pore and nitrogen
Pore, vacuum pumping holes, vacuum meter hole, air-tight bottle hole, sampling pore and nitrogen pore pass through conduit and vacuum pump, vacuum respectively
Table, air-tight bottle, probe tube, nitrogen flushing tracheae are connected, and controlled valve is equipped on the connecting line of vacuum pump and water cooling lid.
The experimental facilities of nitrogen blowing alloying under the conditions of above-mentioned stainless-steel vacuum, the nitrogen flushing tracheae are connected with nitrogen cylinder
It connects, flowmeter is installed on the pipeline of nitrogen flushing tracheae.
The experimental facilities of nitrogen blowing alloying under the conditions of above-mentioned stainless-steel vacuum is connected with Argon in the bottom of Si-Mo rod stove
Tracheae, Argon tracheae are connected with argon bottle, and flowmeter is equipped on the pipeline of Argon tracheae.
The experimental method of nitrogen blowing alloying under the conditions of a kind of stainless-steel vacuum using above-mentioned experimental facilities, it take with
Lower step carries out：
A. graphite protection crucible is put into Si-Mo rod stove；
B. the corundum crucible equipped with stainless steel material is put into the resistance furnace zone of constant temperature；
C. nitrogen flushing tracheae is transferred from fire door to fixation above corundum crucible and is heated up with stove；
D. furnace bottom is blown into argon gas, under an argon atmosphere resistance furnace heat temperature raising, waits for that stainless steel material melts and reaches requirement of experiment temperature
After degree, 30-40 minutes are kept the temperature, 0# samples are extracted with quartz ampoule；
E. according to requirement of experiment, vacuum pump is opened, reaches vacuum requirement, after adjusting nitrogen stream magnitude reaches requirement, by nitrogen blowing
Pipe is inserted into stainless steel melt and blows, and is blown into gas and keeps stable and uniform；
F. primary at interval of sampling in 5 minutes or 10 minutes.
Graphite in the step a, is protected crucible by the experimental method of nitrogen blowing alloying under the conditions of above-mentioned stainless-steel vacuum
It is put into Si-Mo rod stove, graphite protects a diameter of 60-70mm of crucible.
The experimental method of nitrogen blowing alloying under the conditions of above-mentioned stainless-steel vacuum in the step b, will be equipped with stainless steel material
Corundum crucible be put into the resistance furnace zone of constant temperature, stainless steel material weight 0.8-1.2 kg.
The experimental method of nitrogen blowing alloying under the conditions of above-mentioned stainless-steel vacuum, in the step c, by nitrogen flushing tracheae from stove
It fixes above mouth decentralization to corundum crucible and heats up with stove, heat up 1580 DEG C -1520 DEG C.
The experimental method of nitrogen blowing alloying under the conditions of above-mentioned stainless-steel vacuum, in the step d, argon atmosphere pressure
Power is 70-80KPa.
The experimental method of nitrogen blowing alloying under the conditions of above-mentioned stainless-steel vacuum, in the step e, vacuum degree 1KPa,
Nitrogen flow is respectively 0.1Lmin-1、0.2L·min-1、0.3L·min-1。
The beneficial effects of the invention are as follows：
The experimental facilities of the present invention increases water cooling lid on the top of Si-Mo rod stove, and water cooling lid is to be tightly connected with Si-Mo rod stove,
Water cooling has covered vacuum pumping holes and has been connected with vacuum-pumping pipeline, and vacuum pump can will be taken out true by vacuum-pumping pipeline in Si-Mo rod stove
Sky carries out the nitrogen blowing alloying operation experiments under vacuum state.
The experimental facilities of the present invention is simple in structure, easy to use, can carry out blowing under vacuum and antivacuum different conditions
The operation of nitrogen alloying, the free decarburization of simulation VOD depth vacuum and reduction phase are studied stainless steel nitrogen blowing under vacuum condition and are closed
Aurification rule provides true, effective experimental data for stainless steel nitrogen blowing alloying under vacuum condition, to improving product quality
Scientific basis is provided.
The experimental method of the present invention uses Si-Mo rod stove heat stainless steel steel material, by controlling vacuum degree and temperature in stove
Degree adjusts nitrogen flow and nitrogen partial pressure, finally obtains nitrogen content and is the stainless steel of 0.05%-0.10%, and has grasped the dissolving of nitrogen
Rule and influence factor.
The present invention is the pioneering of nitrogen blowing alloying under the conditions of stainless-steel vacuum, has filled up metallurgy industry in stainless-steel vacuum
Under the conditions of in terms of nitrogen blowing alloying device and method blank, solve the molten of stainless steel nitrogen blowing alloying under vacuum condition
Rule is solved, true, effective experimental data is provided for stainless steel nitrogen blowing alloying under vacuum condition, is carried to improving product quality
For scientific basis, theoretical direction is provided for actual production, in industry to nitrogen blowing alloying under the conditions of stainless-steel vacuum
Further development has a very important significance.
Description of the drawings
Fig. 1 is the experimental facilities structural schematic diagram of the present invention；
Fig. 2 is the vertical view of water cooling lid.
It is marked in figure as follows：Flowmeter 1, vacuum meter 2, surge flask 3, air-tight bottle 4, vacuum pump 5, controlled valve 6, boiler tube 7,
Heater element 8, resistance furnace 9, graphite protection crucible 10, corundum crucible 11, stainless steel melt 12, packing material 13, thermometric thermoelectricity
Even 14, nitrogen flushing tracheae 15, nitrogen cylinder 16, Argon tracheae 17, argon bottle 18, water cooling lid 19, vacuum pumping holes 20, vacuum meter hole 21,
Air-tight bottle hole 22, sampling pore 23, nitrogen pore 24.
Specific implementation mode
The experimental facilities of the present invention is by Si-Mo rod stove, water cooling lid 19 and flowmeter 1, vacuum meter 2, surge flask 3, sealing
Bottle 4, vacuum pump 5, controlled valve 6, temperature thermocouple 14, nitrogen flushing tracheae 15, nitrogen cylinder 16, Argon tracheae 17,18 groups of argon bottle
At.
Fig. 1 shows that Si-Mo rod stove includes boiler tube 7, resistance furnace 9, graphite protection crucible 10, corundum crucible 11, packing material
13.Resistance furnace 9 is looped around the circumference of boiler tube 7, and 8 resistance furnace 9 of heater element is equipped in the chamber of resistance furnace 9 and passes through heater element
8 pairs of boiler tubes 7 heat.There is graphite to protect crucible 10 in boiler tube 7, graphite, which is protected, places corundum crucible 11, corundum in crucible 10
There is stainless steel melt 12 in crucible 11, has packing material 13 in the boiler tube 7 of 10 lower section of graphite protection crucible.
Fig. 1 shows, temperature thermocouple 14 is equipped in the bottom of boiler tube 7, temperature thermocouple 14 pass through packing material 13 with
The bottom of graphite protection crucible 10 is connected.
Fig. 1 shows that nitrogen cylinder 16 is connected by nitrogen flushing tracheae 15 with 7 top of boiler tube of Si-Mo rod stove, is blown into boiler tube 7
Enter nitrogen.Argon bottle 18 is connected by Argon tracheae 17 with 7 bottom of boiler tube of Si-Mo rod stove, and argon gas is blown into boiler tube 7.
On the pipeline of nitrogen flushing tracheae 15 and it is separately installed with flowmeter 1 on the pipeline of Argon tracheae 17.
Fig. 1,2 displays, invention increases water cooling lid 19, the upper end of water cooling lid 19 and the boiler tube 7 of Si-Mo rod stove is sealing
Connection, water cooling lid 19 is used to form vacuum in boiler tube 7, to carry out the nitrogen blowing alloying operation experiments under vacuum state.
Fig. 1,2 show there is vacuum pumping holes 20, vacuum meter hole 21, air-tight bottle hole 22, sampling pore 23 on water cooling lid 19 respectively
With nitrogen pore 24.Vacuum pumping holes 20, vacuum meter hole 21, air-tight bottle hole 22, sampling pore 23, nitrogen pore 24 are respectively by leading
Pipe is connected with vacuum pump 5, vacuum meter 2, surge flask 3, air-tight bottle 4, probe tube, nitrogen flushing tracheae 15, in vacuum pump 5 and water cooling lid
Controlled valve 6 is installed on 19 connecting line.
The experimental method of the present invention takes following steps to carry out：
A. graphite protection crucible 10 is put into Si-Mo rod stove；
B. the corundum crucible 11 equipped with stainless steel material is put into 9 zone of constant temperature of resistance furnace；
C. nitrogen flushing tracheae 15 is transferred from fire door to fixation above corundum crucible 11 and is heated up with stove；
D. furnace bottom is blown into argon gas, under an argon atmosphere 9 heat temperature raising of resistance furnace, waits for that stainless steel material melts and reaches requirement of experiment temperature
After degree, 30-40 minutes are kept the temperature, 0# samples are extracted with quartz ampoule；
E. according to requirement of experiment, vacuum pump is opened, reaches vacuum requirement, after adjusting nitrogen stream magnitude reaches requirement, by nitrogen blowing
Pipe 15 is inserted into stainless steel melt 12 and blows, and is blown into gas and keeps stable and uniform；
F. primary at interval of sampling in 5 minutes or 10 minutes.
In step a, graphite protection crucible 10 is put into Si-Mo rod stove, graphite protects a diameter of 60- of crucible 10
70mm。
In stepb, the corundum crucible 11 equipped with stainless steel material is put into 9 zone of constant temperature of resistance furnace, stainless steel material weight
0.8-1.2 kg 。
In step c, nitrogen flushing tracheae 15 is transferred from fire door to fixation above corundum crucible 11 and is heated up with stove, is heated up
1580℃-1520℃。
In step d, argon atmosphere pressure is 70-80KPa.
In step e, vacuum degree 1KPa, nitrogen flow is respectively 0.1Lmin-1、0.2L·min-1、0.3L·min-1。
The embodiment of the present invention is as follows：
Embodiment 1
The experiment of vacuum nitrogen blowing alloying is carried out to 316L stainless steels.This experiment vacuum degree is 0.5KPa, and 1580 DEG C of temperature arrives
1500 DEG C, air-blowing quantity 0.3L/min, example weight 1150g, when air blowing, is 100 minutes a length of.
Experimental procedure：
1）Graphite protection crucible 10 is put into stove；
2）Corundum crucible 11 equipped with 1.15kg 316L stainless steel material is put into 9 zone of constant temperature of resistance furnace；
3）Nitrogen flushing tracheae 15 is transferred from fire door to fixation above corundum crucible 11 and is heated up with stove；
4）Under an ar atmosphere（Furnace bottom is blown into）9 heat temperature raising of resistance furnace, after after steel material dissolved clarification and reaching requirement of experiment temperature, heat preservation
30 minutes, 0# samples are extracted with quartz ampoule；
5）According to requirement of experiment, after adjusting nitrogen stream magnitude reaches requirement, nitrogen flushing tracheae 15 is inserted into stainless steel melt 12 and is blown
Gas is blown into gas and keeps stable and uniform；
6）It is primary at interval of sampling in 10 minutes；
7）After sampling, the power-off cooling of resistance furnace 9 takes out corundum crucible 11 and remaining steel sample and is cooled to room in the process
Temperature.
Nitrogen content in laboratory sample uses thermal conductivity method NACIS/C H 007:2005 measure.
Vacuum nitrogen pick-up experimental result
Embodiment 2
Vacuum nitrogen blowing alloying is carried out to 316L stainless steels.This experiment vacuum degree be 0.5KPa, 1540 DEG C to 1500 DEG C of temperature,
Example weight is 850g, and when air blowing is 100 minutes a length of.
Experimental procedure：
1）Graphite protection crucible 10 is put into stove；
2）Corundum crucible 11 equipped with 0.85kg 316L stainless steel material is put into 9 zone of constant temperature of resistance furnace；
3）Nitrogen flushing tracheae 15 is transferred from fire door to fixation above corundum crucible 11 and is heated up with stove；
4）Under an ar atmosphere（Furnace bottom is blown into）9 heat temperature raising of resistance furnace, after after steel material dissolved clarification and reaching requirement of experiment temperature, heat preservation
30 minutes, 0# samples are extracted with quartz ampoule；
5）According to requirement of experiment, adjusts nitrogen and after argon flow amount value reaches requirement, nitrogen flushing tracheae 15 is inserted into stainless steel melt
It blows in 12, is blown into gas and keeps stable and uniform；
6）It is primary at interval of sampling in 10 minutes；
7）After sampling, the power-off cooling of resistance furnace 9 takes out corundum crucible 11 and remaining steel sample and is cooled to room in the process
Temperature.
Nitrogen content in laboratory sample uses thermal conductivity method NACIS/C H 007:2005 measure.
Vacuum nitrogen pick-up experimental result
Claims (9)
1. the experimental facilities of nitrogen blowing alloying under the conditions of a kind of stainless-steel vacuum, it includes Si-Mo rod stove, is equipped in furnace body
Resistance furnace（9）, graphite protect crucible（10）And corundum crucible（11）, it is characterised in that：Water is increased on the top of Si-Mo rod stove
Cold lid（19）, water cooling lid（19）It is to be tightly connected with Si-Mo rod stove, water cooling lid（19）It is upper to have vacuum pumping holes respectively（20）, vacuum meter
Hole（21）, air-tight bottle hole（22）, sampling pore（23）With nitrogen pore（24）, vacuum pumping holes（20）, vacuum meter hole（21）, sealing
Bottle hole（22）, sampling pore（23）With nitrogen pore（24）Pass through conduit and vacuum pump respectively（5）, vacuum meter（2）, air-tight bottle
（4）, probe tube, nitrogen flushing tracheae（15）It is connected, in vacuum pump（5）With water cooling lid（19）Connecting line on switch valve is installed
Door（6）.
2. the experimental facilities of nitrogen blowing alloying under the conditions of stainless-steel vacuum according to claim 1, it is characterised in that：Institute
State nitrogen flushing tracheae（15）With nitrogen cylinder（16）It is connected, in nitrogen flushing tracheae（15）Pipeline on flowmeter is installed（1）.
3. the experimental facilities of nitrogen blowing alloying under the conditions of stainless-steel vacuum according to claim 1, it is characterised in that：
The bottom of Si-Mo rod stove is connected with Argon tracheae（17）, Argon tracheae（17）With argon bottle（18）It is connected, in Argon tracheae
（17）Pipeline on flowmeter is installed（1）.
4. the experimental method of nitrogen blowing alloying, feature exist under the conditions of a kind of stainless-steel vacuum using above-mentioned experimental facilities
In：It takes following steps to carry out：
A. graphite is protected into crucible（10）It is put into Si-Mo rod stove；
B. by the corundum crucible equipped with stainless steel material（11）It is put into resistance furnace（9）In the zone of constant temperature；
C. by nitrogen flushing tracheae（15）It is transferred from fire door to corundum crucible（11）Top fixation simultaneously heats up with stove；
D. furnace bottom is blown into argon gas, under an argon atmosphere resistance furnace（9）Heat temperature raising waits for that stainless steel material melts and reaches requirement of experiment
After temperature, 30-40 minutes are kept the temperature, 0# samples are extracted with quartz ampoule；
E. according to requirement of experiment, vacuum pump is opened（5）, reach vacuum requirement, after adjusting nitrogen stream magnitude reaches requirement, by nitrogen flushing
Tracheae（15）It is inserted into stainless steel melt（12）Middle air blowing is blown into gas and keeps stable and uniform；
F. primary at interval of sampling in 5 minutes or 10 minutes.
5. the experimental method of nitrogen blowing alloying under the conditions of stainless-steel vacuum according to claim 4, it is characterised in that：Institute
It states in step a, graphite is protected into crucible（10）It is put into Si-Mo rod stove, graphite protects crucible（10）A diameter of 60-70mm.
6. the experimental method of nitrogen blowing alloying under the conditions of stainless-steel vacuum according to claim 4, it is characterised in that：Institute
It states in step b, by the corundum crucible equipped with stainless steel material（11）It is put into resistance furnace（9）In the zone of constant temperature, stainless steel material weight 0.8-1.2
kg 。
7. the experimental method of nitrogen blowing alloying under the conditions of stainless-steel vacuum according to claim 4, it is characterised in that：Institute
It states in step c, by nitrogen flushing tracheae（15）It is transferred from fire door to corundum crucible（11）Top fixation simultaneously heats up with stove, heating 1580
℃-1520℃。
8. the experimental method of nitrogen blowing alloying under the conditions of stainless-steel vacuum according to claim 4, it is characterised in that：Institute
It states in step d, argon atmosphere pressure is 70-80KPa.
9. the experimental method of nitrogen blowing alloying under the conditions of stainless-steel vacuum according to claim 4, it is characterised in that：Institute
It states in step e, vacuum degree 1KPa, nitrogen flow is respectively 0.1Lmin-1、0.2L·min-1、0.3L·min-1。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112359266A (en) * | 2020-11-23 | 2021-02-12 | 莱州润昇石油设备有限公司 | Device for obtaining nitrogen-containing alloy by blowing nitrogen into molten metal |
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2018
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| JPH05331589A (en) * | 1990-05-22 | 1993-12-14 | Korea Advanced Inst Of Sci Technol | Production of rare earth-iron alloy |
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