CN103627841B - Control method for nitrogen content of molten steel of wear-resistant steel - Google Patents
Control method for nitrogen content of molten steel of wear-resistant steel Download PDFInfo
- Publication number
- CN103627841B CN103627841B CN201310535956.7A CN201310535956A CN103627841B CN 103627841 B CN103627841 B CN 103627841B CN 201310535956 A CN201310535956 A CN 201310535956A CN 103627841 B CN103627841 B CN 103627841B
- Authority
- CN
- China
- Prior art keywords
- steel
- molten steel
- ladle
- nitrogen content
- nitrogen
- 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.)
- Active
Links
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a control method for nitrogen content of molten steel of wear-resistant steel. By virtue of optimization of a converter tapping technology, improvement of orders of deoxidizing slagging and alloying of an LF (Ladle Furnace), as well as rational control on ladle bottom argon blowing flow rate and pressure in different smelting stages, and complete protective casting of continuous casting process, the nitrogen content of the molten steel can be controlled within 0.0030% after converter tapping, nitrogen adding in molten steel during LF+RH (Ladle Furnace process +Ladle Furnace process) is steadily controlled within 0.0010%, nitrogen adding in molten steel in the continuous casting process is steadily controlled within 0.0005%, and finally, nitrogen content in a high alloy wear-resistant steel continuous casting billet is controlled within 0.0045%, therefore, internal quality and surface quality of the casting billet are improved greatly.
Description
Technical field
The present invention relates to a kind of process for making of field of metallurgy, relate to the control method of nitrogen content of molten steel in wear resisting steel smelting process.
Background technology
Nitrogen in steel content is comparatively large to the mechanical impact of steel, and along with the increase of nitrogen in steel content, the plasticity of steel declines, and ductility reduces; Nitrogen also can increase the weight of steel timeliness, reduce steel cold-forming property, cause welded heat affecting zone brittle, make casting blank cleavage and cause intergranular corrosion.Therefore reduce nitrogen content of molten steel and always be the target of smelting high-quality steel and pursuing, particularly wear-resisting, it is large that grinding tool smelting steel crosses alloy range amount, LF stove alloying difficulty is large, smelting cycle is long, in order to improve alloying efficiency, shorten smelting cycle, ensure the rhythm of production of continuous casting, usual LF stove takes the stirring of large argon gas to impel alloying, this large argon gas strong power condition contradicts with Control of Nitrogen Content, cause smelting this steel series nitrogen content higher, make that continuously cast bloom is inner and surface quality is poor, affect steel plate and properties for follow, iron and steel benefit is finally made to can not get playing.
Summary of the invention
Object of the present invention is just to overcome existing defect, provides a kind of Control method for nitrogen content of molten steel of wear-resistant steel, effectively controls the content of nitrogen in molten steel, improves smelting steel quality.
The technical scheme that the present invention realizes above goal of the invention is:
A kind of Control method for nitrogen content of molten steel of wear-resistant steel, it is characterized in that segmenting smelting molten steel nitrogen pick-up link in wear resisting steel process, optimize each process procedure, comprise: the optimization of converter smelting process, the optimization of refining furnace smelting technology and the optimization of continuous casting protective casting technique, by deoxidation slag making, the improvement of alloying order, and the conservative control of different smelting stage ladle bottom blowing argon flow amount and pressure, RH is long-time, high vacuum degassing process and the complete protective casting of continuous casting working procedure, control each nitrogen pick-up node, after making converter tapping, nitrogen content of molten steel controls within 0.0030%, refining furnace smelting process molten steel nitrogen pick-up stability contorting is within 0.0010%, continuous casting working procedure molten steel nitrogen pick-up stability contorting is within 0.0005%, realize Control of Nitrogen Content in high alloy wear-resistance steel continuous casting billet within 0.0045%.
Further, the optimization of converter smelting process comprises:
(1) supplementary material controls: in supplementary material and alloy, nitrogen content is strict controlled within 0.020%, is strict controlled within 0.050%, prevents because alloy and auxiliary material cause molten steel nitrogen pick-up containing aluminium supplementary material nitrogen content;
(2) converter operation: improve converter one and fall hit rate more than 95%, forbids the converter later stage to re-blow nitrogen pick-up; Converter tapping prerequisite front opening ladle bottom blowing argon gas, drain air in ladle, after going out steel alloying, ladle bottom blowing flow control is at 50 ~ 80Nl/min, prevents molten steel from turning over greatly and exposedly contacts nitrogen pick-up with air;
(3) steel alloying is gone out: go out steel alloying and add by ladle slag material → reductor → alloy order, after forbidding tapping to terminate, add ladle slag material.
The optimization of refining furnace smelting technology comprises:
(1) LF stokehold phase operation: after molten steel arrives at a station, with the argon flow amount break shell of 50 ~ 200NL/min, actual argon flow amount to be breathed freely situation adjustment according to this heat, must not use bypass operations break shell; For sampling analysis after electrochemical slag 4 ~ 5min, change the slag stage and forbid adding any reductor;
(2) LF stove heat temperature raising ladle bottom blowing technique: during heated by electrodes, ladle bottom blowing argon flow amount 400 ~ 500NL/min, at the maximum actual flow >=300NL/min of ladle dual circuit bottom blowing, bypass operations is forbidden in pressure >=8.0Bar situation, between heating period, LF stove performs micro-pressure operation, guarantees that electrode hole place has micro-cigarette to overflow;
(3) LF stove process control: according to refining furnace first steel sample ingredient and slag condition thickness situation, add suitable lime, fluorite and aluminium wire slag making desulfurization, sweetening process argon flow amount 400 ~ 500Nl/min, feed aluminum steel and mend dissolved aluminum in molten steel, feed aluminum steel and control argon flow amount 30 ~ 60Nl/min, after feeding aluminum steel, carry out the fine setting of composition and temperature; LF stove holding stage, ladle bottom blowing argon flow amount controls at 20 ~ 80Nl/min, not exposed for principle with molten steel;
(4) RH stove process control: vacuum process, RH stove vacuum degree control within 3mbar, pumpdown time >=20min, carry out Calcium treatment after vacuum terminates, Calcium treatment ladle argon bottom-blowing flow 20 ~ 80Nl/min.
The optimization of continuous casting protective casting technique comprises:
(1) ladle prepares: strengthen collector nozzle of ladle cleaning works, guarantee collector nozzle of ladle degree of cleaning, ensures the close fit with continuous casting long gate;
(2) protective casting: start the front 5min that casts, by tunger tube argon purge tundish inner chamber, gets rid of inner air; Start casting, when Metal in Tundish covers collector nozzle of ladle, start to add insulating covering agent, extract tunger tube simultaneously; The multiple batches of short run of casting cycle adds tundish covering flux, and ensuring coverage agent thickness is greater than 80mm.
Control method for nitrogen content of molten steel of wear-resistant steel of the present invention is by the optimization of converter tapping technique, the deoxidation slag making of LF stove and alloy order are improved, and the conservative control of different smelting stage ladle bottom blowing argon flow amount and pressure, RH is long-time, high vacuum degassing process and the complete protective casting of continuous casting working procedure, after realizing converter tapping, nitrogen content of molten steel controls within 0.0030%, LF+RH process molten steel nitrogen pick-up stability contorting is within 0.0010%, continuous casting working procedure molten steel nitrogen pick-up stability contorting is within 0.0005%, finally realize Control of Nitrogen Content in high alloy wear-resistance steel continuous casting billet within 0.0045%, greatly improve strand inside and surface quality.Through verification experimental verification, adopt Control method for nitrogen content of molten steel of wear-resistant steel of the present invention, smelting endpoint averaged nitrogen content can control 0.0038%, and nitrogen content is the highest by 0.0061%, meets plate property and customer requirement completely.
Accompanying drawing explanation
Fig. 1 is Control method for nitrogen content of molten steel of wear-resistant steel schema.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.
Control method for nitrogen content of molten steel of wear-resistant steel of the present invention, its feature is the optimization of converter tapping technique, LF stove deoxidation slag making, alloy order improve, and the conservative control of different smelting stage ladle bottom blowing argon flow amount and pressure, the protective casting that continuous casting working procedure is complete; After converter tapping, nitrogen content of molten steel controls within 0.0030%, LF+RH process molten steel nitrogen pick-up stability contorting is within 0.0010%, continuous casting working procedure molten steel nitrogen pick-up stability contorting, within 0.0005%, finally realizes Control of Nitrogen Content in high alloy wear-resistance steel continuous casting billet within 0.0045%.
As shown in Figure 1, Control method for nitrogen content of molten steel of wear-resistant steel comprises following content:
1, converter smelting process:
(1) supplementary material controls.In smelting process supplementary material and alloy, nitrogen content will control within 0.020%, and particularly containing aluminium supplementary material, nitrogen content will control within 0.050%, prevents because alloy and auxiliary material cause molten steel nitrogen pick-up.
(2) converter operation.Improve converter one and fall hit rate more than 95%, forbid the converter later stage to be re-blow; Ensure that converter tapping mouth-shaped is good, tap hole slag will process in time, prevents diffusing of tapping, steel water and air contact nitrogen pick-up; Converter tapping opens ladle bottom blowing argon gas in first 1 minute in advance, drains air in ladle, and after going out steel alloying, ladle bottom blowing flow control is at 50 ~ 80Nl/min, prevents molten steel from turning over greatly and exposedly contacts nitrogen pick-up with air.
(3) steel alloying is gone out.Go out steel alloying to add by ladle slag material → reductor → alloy order, go out after to 30 seconds to start to add ladle slag material (refining slag 5Kg/t steel, lime 4Kg/t steel) at molten steel, molten steel goes out and starts to add reductor, alloy, carburelant after 1/3, molten steel go out to 2/3 time add, add ladle slag material after forbidding tapping to terminate.
2, refining furnace smelting technology:
(1) LF stokehold phase operation.After molten steel arrives at a station, with the argon flow amount break shell of 50 ~ 200NL/min, actual argon flow amount to be breathed freely situation adjustment according to this heat.Bypass operations break shell must not be used, for sampling analysis after electrochemical slag 4 ~ 5min, change the slag stage and forbid adding any reductor.
(2) LF stove heat temperature raising ladle bottom blowing technique.During heated by electrodes, ladle bottom blowing argon flow amount 400 ~ 500NL/min, at the maximum actual flow >=300NL/min of ladle dual circuit bottom blowing, bypass operations is forbidden in pressure >=8.0Bar situation, between heating period, LF stove should perform micro-pressure operation, guarantees that electrode hole place has micro-cigarette to overflow.
(3) LF stove process control.According to LF stove first steel sample ingredient and slag condition thickness situation, add suitable lime, fluorite and aluminium wire slag making desulfurization, each lime adding amount ton steel is less than 4Kg, aluminium wire add-on is less than 0.2Kg at every turn, sweetening process argon flow amount 400 ~ 500Nl/min, feed aluminum steel and mend dissolved aluminum in molten steel, feed aluminum steel and control argon flow amount 30 ~ 60Nl/min, after line feeding, carry out the fine setting of composition and temperature.LF stove holding stage, ladle bottom blowing argon flow amount controls at 20 ~ 80Nl/min(not exposed for principle with molten steel).
(4) RH stove process control.Vacuum process, RH stove vacuum degree control within 3mbar, pumpdown time >=20min, carry out Calcium treatment after vacuum terminates, Calcium treatment ladle argon bottom-blowing flow 20 ~ 80Nl/min; Calcium treatment terminates, and in order to better promote that the floating of inclusion is removed, controls soft churning time >=12min, and soft stirring ladle bottom blowing argon flow amount 10 ~ 60Nl/min(is not exposed for principle with molten steel).
3, continuous casting protective casting technique
(1) ladle prepares.Strengthen collector nozzle of ladle cleaning works, guarantee collector nozzle of ladle degree of cleaning, ensure the close fit with continuous casting long gate; By long nozzle mould and the comparison of top-fastener following table at every turn before ladle fills with stuffing sand, fit less than polishing in time to the angle of four around top-fastener following table together, ensure laminating, thus reduce continuous casting nitrogen pick-up.
(2) protective casting.The front 5min that starts to cast starts, and by tunger tube argon purge tundish inner chamber, gets rid of inner air; Start casting, when Metal in Tundish covers collector nozzle of ladle, start to add insulating covering agent, extract tunger tube simultaneously; The multiple batches of short run of casting cycle adds tundish covering flux, and ensuring coverage agent thickness is greater than 80mm.
Embodiment 1
The present embodiment selects NM500 steel grade, smelts, slab caster casting situation at 150 tons of converters, 150 tons of ladle furnaces.In order to improve casting billet surface and internal soundness, its NM500 smelting endpoint requirement of nitrogen controls within 0.0050%.
(1) bessemerize.Blow end point composition and temperature control to meet the demands, and converter is re-blow.In table 1.
Table 1 converter terminal composition (%)
(2) deoxidation slag making alloying after Converter.Before tapping, 1min opens ladle bottom blowing argon flow amount setting 500NL/min, and tapping process auxiliary material added order: start tapping → refining slag, lime → aluminium block → silicomanganese, low carbon ferromanganese.
(3) tapping terminates.After going out steel alloying, ladle bottom blowing flow is adjusted to 80Nl/min, prevents molten steel from turning over greatly exposed, and sampling analysis nitrogen content of molten steel is 0.0033% and 0.0037%.
(4) refinement and deoxidation, slag making desulfurization, go to be mingled with technique.LF stove molten steel sets ladle two-way argon bottom-blowing 150Nl/min break shell → heat temperature raising (setting ladle two-way argon bottom-blowing 450Nl/min respectively to station, perform micro-pressure operation, guarantee that electrode hole place has micro-cigarette to overflow) → add aluminium wire, lime, fluorite, feed aluminum steel (setting ladle two-way argon bottom-blowing 50Nl/min) → heating (setting ladle two-way argon bottom-blowing 450Nl/min, perform micro-pressure operation, guarantee that electrode hole place has micro-cigarette to overflow) → add reductive agent, aluminium wire desulfurization, feed aluminum steel (setting ladle two-way argon bottom-blowing 50Nl/min) → alloying (setting ladle two-way argon bottom-blowing 120Nl/min) → heating (setting ladle two-way argon bottom-blowing 500Nl/min).It is 0.0040% and 0.0044% that the process of LF refining furnace terminates nitrogen content.
(5) RH Fruit storage.Two stove RH vacuum tightnesss are respectively at 1.9mbar and 1.4mbar, and the pumpdown time is 20min and 22min respectively, carries out calcium treated steel bag argon bottom-blowing flow set 50Nl/min after vacuum terminates; Calcium treatment terminates, and soft stirring is 12min, and soft stirring ladle bottom blowing argon flow amount setting 30Nl/min(is not exposed for principle with molten steel).It is 0.0032% and 0.0034% that RH process terminates nitrogen content.
(6) ladle operation.Within the collector nozzle of ladle that two stove molten steel use uses equal 3 stoves of heat, guarantee that the lower mouth of a river is clean without steel residue.
(7) protective casting.The front 5min that starts to cast starts, and by tunger tube argon purge tundish inner chamber, when Metal in Tundish covers collector nozzle of ladle (middle bag Metal Weight 18t), starts to add insulating covering agent, extracts tunger tube simultaneously; The multiple batches of short run of casting cycle adds tundish covering flux, and two stove insulating covering agent thickness are respectively 110mm and 90mm.At continuous cast mold sampling analysis, nitrogen content is 0.0033% and 0.0037%.
Embodiment 2
The present embodiment selects NH1250 steel grade, smelts, slab caster casting situation at 150 tons of converters, 150 tons of ladle furnaces.In order to improve casting billet surface and internal soundness, its NH1250 smelting endpoint requirement of nitrogen controls within 0.0060%.
(1) bessemerize.Blow end point composition and temperature control to meet the demands, and converter is re-blow.In table 2.
Table 2 converter terminal composition (%)
(2) deoxidation slag making alloying after Converter.Before tapping, 1min opens ladle bottom blowing argon flow amount setting 350NL/min, and tapping process auxiliary material added order: start tapping → refining slag, lime → aluminium block → silicomanganese, low carbon ferromanganese.
(3) tapping terminates.After going out steel alloying, ladle bottom blowing flow is adjusted to 50Nl/min, prevents molten steel from turning over greatly exposed, and sampling analysis nitrogen content of molten steel is 0.0030% and 0.0028%.
(4) refinement and deoxidation, slag making desulfurization, go to be mingled with technique.LF stove molten steel sets ladle two-way argon bottom-blowing 120Nl/min break shell → heat temperature raising (setting ladle two-way argon bottom-blowing 400Nl/min respectively to station, perform micro-pressure operation, guarantee that electrode hole place has micro-cigarette to overflow) → add aluminium wire, lime, fluorite, feed aluminum steel (setting ladle two-way argon bottom-blowing 35Nl/min) → heating (setting ladle two-way argon bottom-blowing 400Nl/min, perform micro-pressure operation, guarantee that electrode hole place has micro-cigarette to overflow) → add reductive agent, aluminium wire desulfurization, feed aluminum steel (setting ladle two-way argon bottom-blowing 40Nl/min) → alloying (setting ladle two-way argon bottom-blowing 100Nl/min) → heating (setting ladle two-way argon bottom-blowing 450Nl/min).It is 0.0037% and 0.0034% that the process of LF refining furnace terminates nitrogen content.
(5) RH Fruit storage.Two stove RH vacuum tightnesss are respectively at 1.1mbar and 1.5mbar, and the pumpdown time is 18min and 15min respectively, carries out calcium treated steel bag argon bottom-blowing flow set 30Nl/min after vacuum terminates; Calcium treatment terminates, and soft stirring is 12min, and soft stirring ladle bottom blowing argon flow amount setting 20Nl/min(is not exposed for principle with molten steel).It is 0.0030% and 0.0025% that RH process terminates nitrogen content.
(6) ladle operation.Within the collector nozzle of ladle that two stove molten steel use uses equal 3 stoves of heat, guarantee that the lower mouth of a river is clean without steel residue.
(7) protective casting.The front 5min that starts to cast starts, and by tunger tube argon purge tundish inner chamber, when Metal in Tundish covers collector nozzle of ladle (middle bag Metal Weight 18t), starts to add insulating covering agent, extracts tunger tube simultaneously; The multiple batches of short run of casting cycle adds tundish covering flux, and two stove insulating covering agent thickness are respectively 85mm and 93mm.At continuous cast mold sampling analysis, nitrogen content is 0.0032% and 0.0028%.
As can be seen here, the inventive method achieves the control of wear resisting steel nitrogen content of molten steel mainly through the following aspects:
1. converter tapping nitrogen content of molten steel is reduced.Improve converter one and fall hit rate, prevent the converter later stage to re-blow nitrogen pick-up, optimize tapping slag material and reductor order, after preventing deoxidation of molten steel, molten steel does not cover and nitrogen pick-up, tapping terminates adjustment argon flow amount, prevent that molten steel is exposed contacts nitrogen pick-up with air, after ensureing converter tapping, nitrogen content of molten steel controls within 0.0035%.
2. control LF treating processes nitrogen pick-up.The different smelting stage ladle bottom blowing argon flow amount of control LF stove, ensures that LF stove treating processes nitrogen content of molten steel is increased within 0.0010%.
3. RH stove vacuum outgas ability is given full play to.By conservative control RH stove condition of high vacuum degree and degassed treatment time, RH degasification process denitrification percent is made to reach 20%.
4. protective casting.More protection is cast, and controls casting process nitrogen content of molten steel and is increased within 0.0005%.Final smelting endpoint (in crystallizer sample) Control of Nitrogen Content is within 0.0045%.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (6)
1. a Control method for nitrogen content of molten steel of wear-resistant steel, it is characterized in that segmenting smelting molten steel nitrogen pick-up link in wear resisting steel process, optimize each process procedure, comprise: the optimization of converter smelting process, the optimization of refining furnace smelting technology and the optimization of continuous casting protective casting technique, by deoxidation slag making, the improvement of alloying order, and the conservative control of different smelting stage ladle bottom blowing argon flow amount and pressure, RH is long-time, high vacuum degassing process and the complete protective casting of continuous casting working procedure, control each nitrogen pick-up node, after making converter tapping, nitrogen content of molten steel controls within 0.0030%, refining furnace smelting process molten steel nitrogen pick-up stability contorting is within 0.0010%, continuous casting working procedure molten steel nitrogen pick-up stability contorting is within 0.0005%, realize Control of Nitrogen Content in high alloy wear-resistance steel continuous casting billet within 0.0045%,
The optimization of converter smelting process comprises:
(1) supplementary material controls: in supplementary material and alloy, nitrogen content is strict controlled within 0.020%, is strict controlled within 0.050%, prevents because alloy and auxiliary material cause molten steel nitrogen pick-up containing aluminium supplementary material nitrogen content;
(2) converter operation: improve converter one and fall hit rate more than 95%, forbids the converter later stage to re-blow nitrogen pick-up; Converter tapping prerequisite front opening ladle bottom blowing argon gas, drain air in ladle, after going out steel alloying, ladle bottom blowing flow control is at 50 ~ 80 NL/min, prevents molten steel from turning over greatly and exposedly contacts nitrogen pick-up with air;
(3) steel alloying is gone out: go out steel alloying and add by ladle slag material → reductor → alloy order, after forbidding tapping to terminate, add ladle slag material;
The optimization of refining furnace smelting technology comprises:
(1) LF stokehold phase operation: after molten steel arrives at a station, with the argon flow amount break shell of 50 ~ 200NL/min, actual argon flow amount to be breathed freely situation adjustment according to this heat, must not use bypass operations break shell; For sampling analysis after electrochemical slag 4 ~ 5min, change the slag stage and forbid adding any reductor;
(2) LF stove heat temperature raising ladle bottom blowing technique: during heated by electrodes, ladle bottom blowing argon flow amount 400 ~ 500NL/min, at maximum actual flow >=300 NL/min of ladle dual circuit bottom blowing, bypass operations is forbidden in pressure >=8.0Bar situation, between heating period, LF stove performs micro-pressure operation, guarantees that electrode hole place has micro-cigarette to overflow;
(3) LF stove process control: according to refining furnace first steel sample ingredient and slag condition thickness situation, add suitable lime, fluorite and aluminium wire slag making desulfurization, sweetening process argon flow amount 400 ~ 500 NL/min, feed aluminum steel and mend dissolved aluminum in molten steel, feed aluminum steel and control argon flow amount 30 ~ 60NL/min, after feeding aluminum steel, carry out the fine setting of composition and temperature; LF stove holding stage, ladle bottom blowing argon flow amount controls at 20 ~ 80 NL/min, not exposed for principle with molten steel;
(4) RH stove process control: vacuum process, RH stove vacuum degree control within 3mbar, pumpdown time >=20min, carry out Calcium treatment after vacuum terminates, Calcium treatment ladle argon bottom-blowing flow 20 ~ 80 NL/min;
The optimization of continuous casting protective casting technique comprises:
(1) ladle prepares: strengthen collector nozzle of ladle cleaning works, guarantee collector nozzle of ladle degree of cleaning, ensures the close fit with continuous casting long gate;
(2) protective casting: start the front 5min that casts, by tunger tube argon purge tundish inner chamber, gets rid of inner air; Start casting, when Metal in Tundish covers collector nozzle of ladle, start to add insulating covering agent, extract tunger tube simultaneously; The multiple batches of short run of casting cycle adds tundish covering flux, and ensuring coverage agent thickness is greater than 80mm.
2. Control method for nitrogen content of molten steel of wear-resistant steel according to claim 1, it is characterized in that ensureing that converter tapping mouth-shaped is good, tap hole slag processes in time, prevents tapping diffusing steel water and air contact nitrogen pick-up.
3. Control method for nitrogen content of molten steel of wear-resistant steel according to claim 1, it is characterized in that going out after to 30 seconds to start to add ladle slag material at molten steel, wherein refining slag 5kg/t steel, lime 4kg/t steel, molten steel goes out and starts to add reductor, alloy, carburelant after 1/3, molten steel go out to 2/3 time add.
4. Control method for nitrogen content of molten steel of wear-resistant steel according to claim 1, after it is characterized in that Calcium treatment terminates, controls soft churning time >=12min, soft stirring ladle bottom blowing argon flow amount 10 ~ 60 NL/min, not exposed for principle with molten steel.
5. Control method for nitrogen content of molten steel of wear-resistant steel according to claim 1, it is characterized in that slag making sweetening process each lime adding amount ton steel is less than 4 kg, aluminium wire add-on is less than 0.2kg at every turn.
6. Control method for nitrogen content of molten steel of wear-resistant steel according to claim 1, it is characterized in that long nozzle mould and the comparison of top-fastener following table before ladle fills with stuffing sand at every turn, fit less than polishing in time to the angle of four around top-fastener following table together, ensure laminating, thus reduce continuous casting nitrogen pick-up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310535956.7A CN103627841B (en) | 2013-11-01 | 2013-11-01 | Control method for nitrogen content of molten steel of wear-resistant steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310535956.7A CN103627841B (en) | 2013-11-01 | 2013-11-01 | Control method for nitrogen content of molten steel of wear-resistant steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103627841A CN103627841A (en) | 2014-03-12 |
| CN103627841B true CN103627841B (en) | 2015-04-15 |
Family
ID=50209286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310535956.7A Active CN103627841B (en) | 2013-11-01 | 2013-11-01 | Control method for nitrogen content of molten steel of wear-resistant steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103627841B (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103952511A (en) * | 2014-04-03 | 2014-07-30 | 商洛学院 | Method for controlling nitrogen content of high-strength steel molten steel |
| CN104263882B (en) * | 2014-09-22 | 2016-06-15 | 武汉钢铁(集团)公司 | A kind of method of steel for container purified treatment without calcium in steel-making |
| CN104726646B (en) * | 2015-04-03 | 2017-06-20 | 攀钢集团成都钢钒有限公司 | A kind of method of nitrogen content in control high-temperature alloy steel P 91 |
| CN106319131B (en) * | 2015-06-26 | 2018-02-27 | 鞍钢股份有限公司 | Method for controlling nitrogen increase of niobium-containing steel |
| CN104988281A (en) * | 2015-07-31 | 2015-10-21 | 河北钢铁股份有限公司承德分公司 | Method for preventing nitrogen increment of LF refined low-nitrogen steel |
| CN105598405A (en) * | 2016-02-16 | 2016-05-25 | 攀钢集团成都钢钒有限公司 | Continuous casting method for steel for high-quality scraped cylinder body |
| CN106521081B (en) * | 2016-10-26 | 2019-01-22 | 唐山钢铁集团有限责任公司 | Reduce the smelting process of roll inclusion content of steel |
| CN107619983B (en) * | 2017-08-14 | 2019-05-03 | 河钢股份有限公司邯郸分公司 | Reduce the smelting process that TiN is mingled in pinion steel 20CrMnTi |
| CN108193018B (en) * | 2017-12-25 | 2019-06-28 | 南京钢铁股份有限公司 | A kind of LF refining furnace production anti-carburetion method of low-carbon and low-sulphur steel |
| CN108067598A (en) * | 2018-01-03 | 2018-05-25 | 河钢股份有限公司承德分公司 | The method for reducing low-carbon low-silicon steel continuous casting head stove nitrogen in steel content |
| CN108251598B (en) * | 2018-01-12 | 2020-05-05 | 唐山钢铁集团有限责任公司 | Carbon increasing and nitrogen controlling production method of medium-carbon high-alloy steel |
| CN108330252A (en) * | 2018-01-19 | 2018-07-27 | 天津荣程联合钢铁集团有限公司 | A kind of LF stove process for making improving refining precision |
| CN108273971A (en) * | 2018-03-05 | 2018-07-13 | 首钢京唐钢铁联合有限责任公司 | Method for reducing nitrogen increase of molten steel in continuous casting process |
| CN108913844A (en) * | 2018-08-02 | 2018-11-30 | 本钢板材股份有限公司 | The control nitrogen technique of twisted wire steel steel series |
| CN109722500A (en) * | 2019-02-28 | 2019-05-07 | 山东钢铁股份有限公司 | A kind of node control method for LF refining furnace processing carbon aluminium-killed steel molten steel |
| CN110004371B (en) * | 2019-05-07 | 2020-12-18 | 南京钢铁股份有限公司 | Wear-resistant steel and smelting method |
| CN112126742A (en) * | 2020-09-22 | 2020-12-25 | 承德建龙特殊钢有限公司 | LF refining method for controlling nitrogen content in gear steel |
| CN114054738A (en) * | 2021-10-11 | 2022-02-18 | 包头钢铁（集团）有限责任公司 | NM500 wear-resistant steel pouring method capable of avoiding delayed cracks of steel plate |
| CN114381648B (en) * | 2021-12-13 | 2023-02-03 | 首钢京唐钢铁联合有限责任公司 | Method for eliminating surface warping of thermal system alloy steel |
| CN114686638A (en) * | 2022-04-12 | 2022-07-01 | 南京钢铁股份有限公司 | Method for controlling N content in smelting process |
| CN114807515B (en) * | 2022-05-05 | 2023-08-01 | 湖南华菱涟源钢铁有限公司 | Method for controlling nitrogen increase of molten steel under BOF-LF-CC process |
| CN115874009A (en) * | 2022-12-27 | 2023-03-31 | 北京首钢自动化信息技术有限公司 | Control method and device for converter ladle bottom argon blowing, electronic equipment and storage medium |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101469356A (en) * | 2007-12-29 | 2009-07-01 | 安阳钢铁集团有限责任公司 | Steel melting method for reducing nitrogen content in steel by converter tapping feeble deoxidization |
| CN102787202A (en) * | 2011-12-07 | 2012-11-21 | 鞍钢股份有限公司 | Method for controlling nitrogen content of low-nitrogen steel |
| CN103045792B (en) * | 2013-01-08 | 2014-08-27 | 秦皇岛首秦金属材料有限公司 | Smelting technology of low-sulfur steel for thick plates during whole-course bottom blowing nitrogen production of converter |
-
2013
- 2013-11-01 CN CN201310535956.7A patent/CN103627841B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103627841A (en) | 2014-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103627841B (en) | Control method for nitrogen content of molten steel of wear-resistant steel | |
| CN103952511A (en) | Method for controlling nitrogen content of high-strength steel molten steel | |
| CN101550475B (en) | Method for producing ultra-low-carbon steel | |
| CN103469050B (en) | Aluminum-containing cold forging steel smelting process | |
| CN104862443B (en) | A kind of smelting process of low carbon low silicon welding wire steel | |
| CN102071287B (en) | Method for melting high-temperature-resistance and high-pressure-resistance alloy steel | |
| CN102021488B (en) | Steel for nuclear-island seamless steel tube and production method thereof | |
| CN110229992B (en) | Smelting production method of titanium microalloyed low-cost Q355B steel plate | |
| CN109252008A (en) | A kind of production method of low carbon, low nitrogen ultralow-sulfur steel | |
| CN103882303B (en) | Smelting method of steel for gas shielded welding wire | |
| CN102248142B (en) | Method for producing medium and low carbon aluminum killed steel | |
| CN103741006B (en) | A kind of preparation method containing the low nitrogen stainless steel of Ti | |
| CN103320718B (en) | The production method of 316LN nuclear power austenitic stainless steel | |
| CN103045948B (en) | High-chromium steel and manufacturing method thereof | |
| CN105154623B (en) | A kind of efficient alloyage process of melting 38CrMoAl steel | |
| CN107012282B (en) | Method for improving purity of high-quality ultra-low carbon steel | |
| CN103215410B (en) | A kind of method improved containing Nb, Ti steel cleanness | |
| CN105537549B (en) | The production method of 100 DEG C of low temperature seamless steel pipe steel continuous cast round billets | |
| CN104651754A (en) | Low alloy steel for high-pressure boiler tube and preparation method thereof | |
| CN104278197A (en) | Smelting method of steel for low-silicon high-titanium welding wire | |
| CN108893682B (en) | Die steel billet and preparation method thereof | |
| CN105483501A (en) | Smelting method of phosphorus-containing ultra-low carbon steel | |
| CN107354269A (en) | The method that RH complex deoxidizations produce ultra-low-carbon steel | |
| CN102864378A (en) | Process for smelting low-cost X70 pipeline steel moderate-thickness plate blanks | |
| CN106191375A (en) | Seamless steel pipe titanium-containing austenitic stainless steel circular pipe blank continuous casting producing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |