CN105838959B - A kind of vanadium nitrogen microalloy additions and preparation method thereof - Google Patents
A kind of vanadium nitrogen microalloy additions and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/16—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on nitrides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/06—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron
- C01B21/0615—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with transition metals other than titanium, zirconium or hafnium
- C01B21/0617—Binary compounds of nitrogen with metals, with silicon, or with boron, or with carbon, i.e. nitrides; Compounds of nitrogen with more than one metal, silicon or boron with transition metals other than titanium, zirconium or hafnium with vanadium, niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
Abstract
A kind of vanadium nitrogen microalloy additions and preparation method thereof, vanadium nitrogen microalloy additions include the vfanadium compound, the Delanium reducing agent that mass fraction is 20~28 parts, the activating agent that mass fraction is 1~5 part that mass fraction is 100 parts；Preparation method includes grinding vfanadium compound through flour mill；Delanium reducing agent is mixed with the vfanadium compound after grinding, activating agent and water is added, is well mixed；Mixture is compressing, moisture process is evaporated through natural normality, is dried, reduced through full-automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns, is carbonized, nitrogenized, sintered, cooling integrated continuous sintering technique prepares vanadium nitrogen microalloy additions.The present invention uses Delanium raw material in terms of dispensing matches reducing agent, improves reduction rate, product yield is improved；With process equipment it is simple, labor productivity is greatly improved, production cost substantially reduces the characteristics of.
Description
Technical field
The present invention relates to one kind production vanadium nitrogen microalloy additions and preparation method thereof.
Technical background
VN alloy is used primarily in the additive as alloy in metallurgy industry, industrial development in recent years it is rapid, greatly
The industrial scale applications as shown by data of amount：Vanadium adds in steel and brings interests for STEELMAKING PRODUCTION（Reduce relation reheating temperature, reduce horizontal stroke
To crackle, reduce the influence reduction of rolling load, rolling condition to the characteristic of steel etc.）, improve the performance of steel（Intensity, toughness,
Ductility, mouldability, weldability and antifriction performance, etc.）, so as to reduce cost.The reduction of this cost refers not only to steel
Production cost reduction, and be the reduction for the manufacturing cost brought using these V-alloyed steels, e.g., build building, bridge, wheel
Ship, automobile, railway etc..Vanadium is added in steel, the performance of steel can be significantly improved.Practice have shown that 0.1% is added in structural steel
Vanadium, intensity 10~20% can be improved, mitigate construction weight 15~25%, reduce cost 8~10%.During according to high strength steel containing vanadium,
Metal structure weight 40~50% can be mitigated, lower than the cost of general structural steel 15~30%.
Research shows：Vanadium is added in steel, and in addition to solution strengthening effect is not notable, the property of steel is significantly improved in following several respects
Energy.
1. V (CN) is high in austenite emphasis solubility product, vanadium all has stronger precipitation strength in basic, normal, high carbon steel
Effect.
The growing up of austenite crystal when 2. vanadium is added in steel by preventing to heat, suppresses deformed austeaite and recrystallize, by force
Change the approach such as γ → α phase-transition crystal grain thinnings effect, have the function that the crystal grain for refining steel.
Significantly affected 3. vanadium has to Cooling Austenite Transformation, research shows, different from most of alloying elements, vanadium does not prolong
Slow ferritic transformation and postpone bainite and perlitic transformation.Meanwhile vanadium improves the effect of the quenching degree of steel, is same content
Contribute quenching degree two times of molybdenum.
Vanadium promotes ferritic formation in heat affected area, so as to improve the toughness of weldment in welding high-strength steel.In,
Vanadium micro-alloying is used in high-carbon steel, will substantially postpone perlitic transformation, can be obtained under the conditions of same cooling velocity thinner
Pearlite, that is, improve the degree of sorbitizing, such as in rigid line product, vanadium micro-alloying not only increase product intensity and
Toughness, and be possible to partly or entirely cancel lead bath processing.In rail product, to improve its service life, develop and owed
Fast quenching technical, i.e. SQ（Slack Quenching）Technique.Experiment shows, in the case of hardness identical, pearlite is than tempering
Martensite and bainite are more resistant, and the piece interlamellar spacing of pearlite is smaller, and its anti-wear performance is better.Added in rail appropriate
Vanadium, its transition curve moves to right, and makes it when implementing SQ techniques, it is easier to realize the sorbitizing of tissue.
The main points of the physical metallurgy principle of v n micro alloying：1. in steel after nitrogen pick-up, the vanadium originally in admittedly molten state turns
Become the vanadium of precipitation state, give full play to the precipitation enhancement of vanadium；2. nitrogen has the work of obvious crystal grain thinning in steel
With；3. v n micro alloying by optimizing precipitation and the fining ferrite grains of vanadium, has given full play to grain refining strengthening and heavy
Form sediment and strengthen the effect of two kinds of schedule of reinforcements, substantially improve the combination of strength and toughness of steel, fully demonstrated microalloying and passed through in technology
Advantage in terms of Ji；4. use v n micro alloying, it is not necessary to other valuable alloying elements are added, under hot-rolled condition
Obtain the high strength steel that yield strength is 550~600MPa.Therefore, VN alloy is used widely in steel.
In micro alloyed steel production, VN reduces cost because having the addition for saving vanadium, vanadium, nitrogen recovery rate stably,
The performance inconsistency of steel is reduced, there is more effective precipitation strength and Grain Refinement Effect than vanadium iron and save 20%~40% vanadium etc.
Feature, pretend as a kind of most economical effective additive of Aldecor, there is positive application value.
With both at home and abroad to VN alloy（VN）Research work deepens continuously, and people are fully recognized that having for VN alloy
Benefit effect.Found according to the research of modern age materialogy, when containing a certain amount of alloying element and a certain amount of nitrogen in some steel, warp
Can increase substantially the performance of steel after heat treatment.For example, nitrogen can stable austenite stainless steel, improve its decay resistance；
Containing in V or steel containing V+N, if containing a certain amount of N, nitrides precipitate is after heat treatment generated, hardening of steel can be promoted, Gao Gang's
Intensity.Generally there is increasing method for nitrogen in steel：1. add rich nitrogen ferromanganese, 2. add nitrolim, 3. nitrogen flushing, 4. use ferrovanadium nitride,
But these methods have weak point：It is 1. expensive；2. yield is low and unstable；3. special device is needed during nitrogen flushing.4. want Mr.
Vanadium iron is produced, then solid State Nitriding obtains ferrovanadium nitride, manufacturing cost is high.Domestic and international bibliography is using You① American Associations company
Vacuum carbon reduction method takes the technology of vanadium nitride by strategy, 2. has the empty bed of flowing or return bend (material can be back to back), 3. Panzhihua steel
Inland Steel has applied for " vanadium nitride list pushed bat kiln production method " patent, and 4. Changsha Longtai Science Co., Ltd provides a kind of recruitment
The method that industry micro-wave oven produces vanadium nitride, 5. the YongCheol Hong of South Korea under atmospheric pressure with N2/Ar/H2 microwaves etc. from
Sub- flame decomposes gaseous VOCl5, has obtained the C. L. of nanoscale vanadium nitride particles, 6. TaiWan, China containing a small amount of V2O5
Yeh is obtained being ignited under nitrogen atmosphere after well mixed vanadium powder and carbon dust compression by high temperature self-reproduction mode (SHS)
The carbonitride of vanadium, 7. the Sansan Yu of Northeast China university be two process conformities of V2O3 carbon thermal reduction and nitridation
One process, i.e., crystal grain and shape all very cube vanadium nitrides of expansion are produced by one-step method.
Tradition prepares vanadium nitride process, and not only consersion unit is harsh, and the elevated temperature strength of equipment and materials requires height, it is necessary to high temperature
Environment, and grow reaction time, cause labor productivity low；Long reaction time causes energy consumption excessive；Prolonged high temperature
Process is big to equipment loss；Disposably input is big for equipment, and output is small, and input and output are disproportionate to cause production cost high,
Product competitiveness declines.
The content of the invention
Its purpose of the invention, which is that, provides a kind of vanadium nitrogen microalloy additions and preparation method thereof, is utilizing vfanadium compound
With Delanium reducing agent by the way of carbonization and nitridation are carried out simultaneously, effectively to solve the preparation of microalloy additions
Severe reaction conditions in journey, the problem of reaction time is long, the present invention uses Delanium raw material in terms of dispensing matches reducing agent,
Reduction rate is improved, product yield is improved；With process equipment it is simple, work production effect is greatly improved
The characteristics of rate, production cost substantially reduce.
The technical scheme realized above-mentioned purpose and taken,
A kind of vanadium nitrogen microalloy additions, including vfanadium compound that mass fraction is 100 parts, mass fraction are 20~28 parts
Delanium reducing agent, mass fraction be 1~5 part of activating agent；The vfanadium compound is vanadic anhydride, three oxidations two
Vanadium or ammonium metavanadate；The Delanium reducing agent is 399 graphous graphite powders；The activating agent be Fe2O3, alumina powder or
K2Cr2O7。
A kind of preparation method of vanadium nitrogen microalloy additions, comprises the steps：
1）The vfanadium compound that mass fraction is 100 parts is ground to 200-250 mesh through flour mill；
2）The Delanium reducing agent that mass fraction is 20~28 parts is mixed with the vfanadium compound after grinding, adds matter
The water that number is 1~5 part of activating agent and mass fraction is 12 parts is measured, is sufficiently mixed uniformly through spiral rotary drum type batch mixer；
3）Mixture after will be well mixed is compressing under the conditions of pressure is 3000pa~5000pa, and shaping is made again
Product were dried by the natural normality of 3 days, were dried, reduce, were carbonized, nitrogen through full-automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns
Change, sintering, cooling integrated continuous sintering technique prepare vanadium nitrogen microalloy additions.
Beneficial effect
The present invention has advantages below compared with prior art.
1st, Delanium raw material is used in terms of dispensing matches reducing agent, i.e.,：Delanium reducing agent is 399 artificial stones
Ink powder, its reduction rate is advantageous to the secondary reduction time than natural flake graphite and crystalline graphite powder reduction rate fast 20%,
Product yield improves 15%；
2nd, using full-automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns, without vacuum drying oven, can successively be run under normal pressure
Technique.Reduction, carbonization under this normal pressure, nitridation, sintering process avoid vacuum process and coreless induction furnace（Shaft kiln）Process, also avoid
The complication of other process equipments, vacuum reduction method shorten several hours from tens hours, labor are greatly improved
Dynamic production efficiency, it is truly realized technology production.Reduced till now from 12000 degree of former electricity/ton VN on the energy
3500 degree of electricity/ton VN, make production cost be greatly lowered because of the reduction of energy consumption.Ring is also protected while the energy is saved
Border, it is truly realized clean manufacturing type enterprise.In terms of lectotype selection and equipment research, using full-automatic 55 meters of nitrogen atmosphere protections
The dou-ble-pusher kiln daily output can reach 3.5 tons to 4 tons, and the full-automatic 55 meters of nitrogen atmosphere protections dou-ble-pusher kiln annual production capacity of separate unit is reachable
To 1000 tons to 1100 tons, so that production cost substantially reduces, product has more the market competitiveness.
Embodiment
A kind of vanadium nitrogen microalloy additions, including vfanadium compound that mass fraction is 100 parts, mass fraction are 20~28 parts
Delanium reducing agent, mass fraction be 1~5 part of activating agent；The vfanadium compound is vanadic anhydride, three oxidations two
Vanadium or ammonium metavanadate；The Delanium reducing agent is 399 graphous graphite powders；The activating agent be Fe2O3, alumina powder or
K2Cr2O7。
A kind of preparation method of vanadium nitrogen microalloy additions, comprises the steps：
1）The vfanadium compound that mass fraction is 100 parts is ground to 200-250 mesh through flour mill；
2）The Delanium reducing agent that mass fraction is 20~28 parts is mixed with the vfanadium compound after grinding, adds matter
The water that number is 1~5 part of activating agent and mass fraction is 12 parts is measured, is sufficiently mixed uniformly through spiral rotary drum type batch mixer；
3）Mixture after will be well mixed is compressing under the conditions of pressure is 3000pa~5000pa, and shaping is made again
Product were dried by the natural normality of 3 days, were dried, reduce, were carbonized, nitrogen through full-automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns
Change, sintering, cooling integrated continuous sintering technique prepare vanadium nitrogen microalloy additions.
Full-automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns nitrogen flow control is in 1920m3/t.
Heat exchanger of the drying temperature in kiln by main kiln tail section is born in full-automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns
Heat is provided, it is 150 degree to bear kiln drying temperature, and it is 5.5 hours to bear kiln drying time, is dried to vanadium nitrogen microalloy additions pellet
Moisture content ﹤ 0.5%.
The pellet after kiln drying is born in full-automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns and enters full-automatic 55 meters of nitrogen
Reduction is divided into once reduction and secondary reduction in atmosphere protection dou-ble-pusher kiln, and a reduction temperature is 500 DEG C~750 DEG C, also
It is former 4.5 hours, by V2O5It is restored to the V of indissoluble2O4。
Secondary reduction, carbonization, nitridation are completed in carbonization, nitridation simultaneously in full-automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns
Temperature is 750 DEG C~1250 DEG C, is reduced 7 hours；Nitridation sintered temperature is 1250 DEG C~1600 DEG C, is sintered 12 hours.
Full-automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns chilling temperature is 950 DEG C~100 DEG C, and outlet temperature is at 80 DEG C
Below.
Embodiment 1
Vanadium nitrogen microalloy additions are prepared by raw material of vanadic anhydride：
Sheet or powdery vanadic anhydride are milled to 200-250 mesh through flour mill, weigh five oxygen that mass fraction is 100g
Change two vanadium, with addition of 26 Delanium reducing agents, this implementation selection Delanium reducing agent is for 399 graphous graphite powders, its supplying
It is foundation to measure following reaction equation, is prepared by chemical reaction metering, and suitably adjust mixed carbon comtent.
V2O5+6C+1/2N2=VC+VN+5CO
Add 2.8g activating agents K2Cr2O7（Potassium bichromate）, it is sufficiently mixed uniformly, is entering through spiral rotary drum type batch mixer
Wet mixing machine is carried out plus 12g water carries out wet mixing, and compressing after being well mixed, shaping pressing pressure is 3000pa, after shaping
In the anistree prismatic body that product size is 40 × 40 × 35mm, shaping was dried in product by the natural normality of 3 days, to improve
Its intensity and reaction speed and the effect for reducing reduction process mass expanded.Enter through full-automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns
The integral continuous sintering technique of row prepares vanadium nitrogen microalloy additions --- --- VN alloy.
Wherein, dou-ble-pusher kiln nitrogen flow 1920m3/t；Dou-ble-pusher kiln is divided into main kiln and negative kiln, bears drying temperature in kiln,
The heat obtained by main kiln tail section heat exchanger, the temperature changed are 150 degree, and it is 5.5 hours to bear kiln drying time, and it is aqueous to be dried to pellet
Divide ﹤ 0.5%.Reduction, carbonization, nitridation, sintering, cooling integrated continuous sintering technique are completed in main kiln；Reduction is divided into dou-ble-pusher kiln
Once reduction and secondary reduction, a reduction temperature is 750 DEG C and reduced 4.5 hours, carries out reduction V2O5To the V of indissoluble2O4；Kiln
Secondary reduction is completed in interior carbonization nitridation simultaneously, and secondary reduction carbonization is nitrogenized when 1250 DEG C of carbonization nitridations 7；It is nitridation sintered in 1600
DEG C sintering 12 hours；Chilling temperature is less than 100 DEG C, below 80 DEG C of outlet temperature, is cooled down 4 hours.
Embodiment 2
Vanadium nitrogen microalloy additions are prepared by raw material of vanadium trioxide
Powdery vanadium trioxide is milled to 200-250 mesh through flour mill, weighing the vanadium trioxide that mass ratio is 100g is
Radix, with addition of 20g Delanium reducing agents, this implementation selects Delanium reducing agent as 399 graphous graphite powders, its amount of allocating
Following reaction equation is foundation, is prepared by chemical reaction metering, and suitably adjust mixed carbon comtent.
V2O3+4C+1/2N2=VC+VN+3CO
4g activating agent Fe2O3 powder is added, is sufficiently mixed uniformly through spiral rotary drum type batch mixer, is added into wet mixing machine
12g water carries out wet mixing, and compressing after being well mixed, shaping pressing pressure is 4000pa, and after shaping is in product size
40 × 40 × 35mm anistree prismatic body, shaping was dried in product by the natural normality of 3 days, to improve its intensity and reaction
Speed and the effect for reducing reduction process mass expanded.Be dried, be carbonized through full-automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns,
Nitridation, sintering, cooling integrated continuous sintering technique prepare vanadium nitrogen microalloy additions --- --- VN alloy.
Wherein, dou-ble-pusher kiln nitrogen flow 1500m3/t；Drying temperature in negative kiln, the heat obtained by main kiln tail section heat exchanger
Amount, the temperature changed are 150 degree, and it is 5.5 hours to bear kiln drying time, is dried to pellet moisture content ﹤ 0.5%；One time reduction temperature is
650 DEG C, reduce 5 hours；Secondary reduction carbonization nitrogenizes to be nitrogenized 4.5 hours in 1170 DEG C of carbonizations；It is nitridation sintered to sinter 7 in 1450 DEG C
Hour；Chilling temperature is less than 500 DEG C, below 80 DEG C of outlet temperature, is cooled down 5.5 hours.
Embodiment 3
With ammonium metavanadate（NH4VO3）Vanadium nitrogen microalloy additions are prepared for raw material：
Powdery ammonium metavanadate is milled to 200 mesh through flour mill, it is the pulverized pieces vanadic acid that 100g is radix to weigh mass fraction
Ammonium, with addition of 28g Delanium reducing agents, this implementation selects Delanium reducing agent as 399 graphous graphite powders, its amount of allocating with
Lower reaction equation is foundation, is prepared by chemical reaction metering, and suitably adjust mixed carbon comtent.
2 NH4VO3 +6C+1/2N2=VC+VN+2NH3+5CO↑+H2O↑
3.2g activating agent alumina powders are added, is sufficiently mixed uniformly through spiral rotary drum type batch mixer, enters into wet mixing machine
Row plus 12g water carry out wet mixing, be well mixed after it is compressing, shaping pressing pressure is 3000pa, after shaping in product chi
It is very little be 40 × 40 × 35mm anistree prismatic body, shaping dried in product by the natural normality of 3 days, with improve its intensity and
Reaction speed and the effect for reducing reduction process mass expanded.Integrally connected through full-automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns
Continuous sintering process prepares vanadium nitrogen microalloy additions --- --- VN alloy.
Wherein, dou-ble-pusher kiln nitrogen flow 2327m3/t；Drying temperature in negative kiln, the heat obtained by main kiln tail section heat exchanger
Amount, the temperature changed are 150 degree, and it is 5.5 hours to bear kiln drying time, is dried to pellet moisture content ﹤ 0.5%, one time reduction temperature is
450 DEG C reduce 4.7 hours, carry out reduction V2O5To the V of indissoluble2O4；Secondary reduction carbonization nitrogenizes small in 650 DEG C of carbonization nitridations 6
When；It is nitridation sintered to sinter 10 in 1280 DEG C
Hour；Chilling temperature is less than 350 DEG C, below 130 DEG C of outlet temperature, is cooled down 5.2 hours.
Under above-mentioned process conditions, the vanadium nitrogen microalloy additions of preparation are consisting of vanadium content 77%~81%, nitrogen content
14%~18%, carbon content 3%~8%, sulfur content ﹤ 0.01%, phosphorus content ﹤ 0.01%, oxygen content ﹤ 1.0%.
Claims (6)
1. a kind of preparation method of vanadium nitrogen microalloy additions, it is characterised in that comprise the steps：
1) vfanadium compound that mass fraction is 100 parts is ground to 200-250 mesh through flour mill, the vfanadium compound is five oxygen
Change two vanadium, vanadium trioxide or ammonium metavanadate；
2) the Delanium reducing agent that mass fraction is 20~28 parts is mixed with the vfanadium compound after grinding, adds mass parts
The water that number is 1~5 part of activating agent and mass fraction is 12 parts, is sufficiently mixed uniformly, the people through spiral rotary drum type batch mixer
It is 399 graphous graphite powders to make graphite reduction agent, and the activating agent is Fe2O3, alumina powder or K2Cr2O7；
3) mixture after will be well mixed is compressing under the conditions of pressure is 3000pa~5000pa, and the reproduced goods of shaping lead to
Cross the natural normality of 3 days to dry, be dried, reduce, be carbonized, nitrogenize, burn through full-automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns
Knot, cooling integrated continuous sintering technique prepare vanadium nitrogen microalloy additions.
2. the preparation method of a kind of vanadium nitrogen microalloy additions according to claim 1, it is characterised in that described full-automatic
55 meters of nitrogen atmosphere protection dou-ble-pusher kiln nitrogen flow controls are in 1920m3/t。
3. the preparation method of a kind of vanadium nitrogen microalloy additions according to claim 1, it is characterised in that described full-automatic
The drying temperature born in 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns in kiln provides heat by the heat exchanger of main kiln tail section, bears the dry temperature of kiln drying
Spend for 150 degree, it is 5.5 hours to bear kiln drying time, is dried to vanadium nitrogen microalloy additions pellet moisture content ﹤ 0.5%.
4. the preparation method of a kind of vanadium nitrogen microalloy additions according to claim 1 or 3, it is characterised in that described complete
The pellet after kiln drying is born in automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns and enters full-automatic 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns
Interior reduction is divided into once reduction and secondary reduction, and a reduction temperature is 500 DEG C~750 DEG C, is reduced 4.5 hours, will
V2O5 is restored to the V2O4 of indissoluble.
5. the preparation method of a kind of vanadium nitrogen microalloy additions according to claim 1, it is characterised in that described full-automatic
Secondary reduction is completed in carbonization, nitridation simultaneously in 55 meters of nitrogen atmosphere protection dou-ble-pusher kilns, and carbonization, nitriding temperature are 750 DEG C~1250
DEG C, reduce 7 hours；Nitridation sintered temperature is 1250 DEG C~1600 DEG C, is sintered 12 hours.
6. the preparation method of a kind of vanadium nitrogen microalloy additions according to claim 1, it is characterised in that described full-automatic
55 meters of nitrogen atmosphere protection dou-ble-pusher kiln chilling temperatures are 950 DEG C~100 DEG C, and outlet temperature is below 80 DEG C.
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