CN115652025A - Accurate nitrogen increasing method for nitrogen-containing non-quenched and tempered steel - Google Patents
Accurate nitrogen increasing method for nitrogen-containing non-quenched and tempered steel Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 194
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 95
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 70
- 239000010959 steel Substances 0.000 title claims abstract description 70
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 title claims abstract description 22
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000007664 blowing Methods 0.000 claims abstract description 40
- 229910052786 argon Inorganic materials 0.000 claims abstract description 29
- 238000007670 refining Methods 0.000 claims abstract description 26
- 238000010079 rubber tapping Methods 0.000 claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 21
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 6
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 8
- 238000005275 alloying Methods 0.000 claims description 8
- RRZKHZBOZDIQJG-UHFFFAOYSA-N azane;manganese Chemical compound N.[Mn] RRZKHZBOZDIQJG-UHFFFAOYSA-N 0.000 claims description 8
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 229910001199 N alloy Inorganic materials 0.000 abstract description 4
- 238000009849 vacuum degassing Methods 0.000 description 23
- 238000009847 ladle furnace Methods 0.000 description 22
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- SJKRCWUQJZIWQB-UHFFFAOYSA-N azane;chromium Chemical compound N.[Cr] SJKRCWUQJZIWQB-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000004767 nitrides Chemical group 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a precise nitrogen increasing method for nitrogen-containing non-quenched and tempered steel, which comprises an electric furnace smelting process, an LF furnace refining process and a VD vacuum process, wherein a bottom blowing nitrogen method is adopted in the LF furnace refining process, when the temperature of molten steel is less than or equal to 1550 ℃, the nitrogen flow is controlled to be 100-180NL/min, the temperature is measured after the molten steel is powered on for 5-20min, and when the temperature of the molten steel is more than or equal to 1550 ℃, the nitrogen flow is adjusted to be 30-120NL/min. According to the invention, no nitrogen alloy is added in the electric furnace tapping and refining processes, so that the cost is reduced; bottom blowing gas is replaced by argon gas 2 minutes before breaking vacuum in the VD vacuum process, so that nitrogen gas is dissolved in molten steel more uniformly, and the N content is accurately controlled; and after the VD is empty, feeding nitrogen lines at one time according to the process target value, and realizing the accurate control and the purity control of the nitrogen element.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a precise nitrogen increasing method for nitrogen-containing non-quenched and tempered steel.
Background
In designing the composition of non-heat-treated steel, it is generally necessary to add elements such as aluminum, titanium, and nitrogen, and to refine austenite grains by precipitating aluminum nitride and titanium nitride to pin austenite grain boundaries. The nitrogen increase can improve the stability of the titanium nitride and prevent austenite grains from coarsening, and related experiments and literature data show that the yield strength of the non-quenched and tempered steel can be improved by 6-10MP when the nitrogen is increased by 10 ppm.
The currently common nitrogen increasing methods are mainly three types: adding nitrogen-containing alloy (chromium nitride, manganese silicon nitride, manganese nitride and the like) into tapping steel of a primary furnace (an electric furnace or a converter), and feeding nitrogen-containing wires (silicon nitride wires, manganese nitride wires and manganese silicon nitride wires) into the molten steel through a wire feeding machine after a vacuum process.
The accurate nitrogen control method in the smelting of the CN113416881A nitrogen-containing steel grade adopts an electric furnace to initially smelt molten steel, and the molten steel is pre-deoxidized when the electric furnace taps; fully reducing molten steel in the early stage of LF refining, and controlling the oxygen content in the molten steel to be less than or equal to 10ppm before VD; feeding the ferrosilicon nitride core-spun yarns into the ladle in two times after the refining process VD, wherein the time interval between the two times of feeding is controlled to be 10-20 min. In the method, nitrogen lines are fed twice after VD, so that the required nitrogen line amount is large and the cost is high; the interval time of the two wire feeding is controlled to be 10-20 min, the production period is longer, and the long-time casting production is not facilitated. The nitrogen line is fed twice, which is not favorable for controlling the purity of molten steel and is easy to cause the overproof inclusion.
CN110438291B is a nitrogen control method for carburized gear steel. After tapping of the converter, carrying out soft blowing on the molten steel in the steel ladle, and adding manganese nitride alloy into the molten steel in the soft blowing process; and blowing nitrogen into the molten steel in the LF ladle refining process, and not feeding nitrogen wires after VD is broken. The method generally aims at gear steel with the nitrogen content of about 120ppm, the nitrogen content of the gear steel is lower than that of non-quenched and tempered steel, a nitrogen line needs to be fed when VD (vacuum degassing) of the non-quenched and tempered steel is smelted by adopting the method, and manganese nitride alloy needs to be added after steel is tapped from a converter, so that the nitrogen alloy is expensive at present, and the nitrogen removal reaction exists in the vacuum process, so that the method is high in cost.
CN114032357A is a smelting method for accurately controlling the nitrogen content in steel. A small amount of manganese nitride alloy is added for nitrogen increase in the stokehole tapping process, bottom blowing argon is adopted in the early stage of refining, and when the temperature of molten steel reaches T, a ladle is stirred by nitrogen. And when the vacuum degree of the VD furnace is less than or equal to 67Pa, starting bottom blowing nitrogen stirring, and switching to argon stirring after breaking the vacuum. According to the method, the manganese nitride alloy is added into the steel, so that the cost is high; meanwhile, because of denitrification reaction in the vacuum process, a large amount of nitrogen element added into the alloy can be lost, and the production cost is increased; bottom blowing nitrogen only when the LF refining temperature reaches T ℃, only bottom blowing argon when the former-stage temperature is low, and not realizing the whole bottom blowing nitrogen of the LF refining; the VD is not switched to nitrogen after arriving at the station, and the bottom blowing nitrogen stirring is started only when the vacuum degree is less than or equal to 67 Pa; the method is suitable for producing the gear steel with the nitrogen content of 100-150ppm and is not suitable for producing the non-quenched and tempered steel with the nitrogen content of 150-200 ppm.
Therefore, it is desirable to solve the above problems.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a precise nitrogen increasing method of nitrogen-containing non-quenched and tempered steel, which has low cost, can precisely control the nitrogen content in molten steel and can improve the purity of the molten steel, and is particularly suitable for producing the non-quenched and tempered steel with the nitrogen content of 130-220 ppm.
The technical scheme is as follows: the invention provides a precise nitrogen increasing method for nitrogen-containing non-quenched and tempered steel, which comprises an electric furnace smelting process, an LF furnace refining process, a VD vacuum process and a continuous casting process, wherein the LF furnace refining process adopts a bottom blowing nitrogen method in the whole process, the nitrogen flow is controlled to be 100-180NL/min when the temperature of molten steel is less than or equal to 1550 ℃, the temperature is measured after the molten steel is electrified for 5-20min, and the nitrogen flow is adjusted to be 30-120NL/min when the temperature of the molten steel is greater than or equal to 1550 ℃.
Further, in the electric furnace smelting process, the tapping temperature needs to be more than or equal to 1610 ℃, static boiling is carried out for 1-2min before tapping, and the furnace body is shaken left and right once.
Preferably, in the electric furnace smelting process, argon is added and stirred for 2-5min in the tapping process, and the flow of the argon is 130-400NL/min.
Further, in the furnace refining process, the time of bottom blowing nitrogen is more than or equal to 80min, the flow of nitrogen is adjusted according to the stages of power transmission, alloying, wire feeding, recarburization and soft blowing, and the adjustment range is 30-150NL/min.
In the VD vacuum step, nitrogen gas was blown from the bottom of the molten steel at the VD vacuum step, and the bottom-blown gas was switched to argon gas 2 minutes before the steel was evacuated.
Furthermore, the flow rate of bottom-blown nitrogen in the VD vacuum process is 30-80NL/min.
Furthermore, the flow rate of argon bottom blowing in the VD vacuum process is 20-60NL/min.
Preferably, the VD vacuum process bottom blows argon, and when the vacuum degree is less than or equal to 100Pa, timing is started and the time is kept for 6-10min.
Further, after the VD vacuum process is broken, a gas sample is taken to analyze the N content, a nitrogen line is fed once according to the target value of the process component, the nitrogen line is fed and stirred for 5-15min, then sampling analysis is carried out, and the N content is confirmed.
Preferably, the nitrogen wire fed in the VD vacuum process is a high-purity silicon nitride or manganese nitride cored wire.
Has the beneficial effects that: compared with the prior art, the invention has the following remarkable advantages:
(1) Nitrogen alloy is not added in the tapping and refining processes of the electric furnace, nitrogen is blown from the bottom in the whole LF refining process, so that nitrogen elements are fully dissolved in molten steel, the nitrogen alloy is replaced by the nitrogen, and the production cost is reduced;
(2) Argon gas is stirred for 2-5min after the tapping of the electric furnace is finished, so that the full melting of the alloy and the floating of impurities in molten steel are facilitated;
(3) The nitrogen is increased in the whole LF refining process by adopting a bottom blowing nitrogen mode, so that the nitrogen is still adopted in a low-temperature section, and the utilization rate of the nitrogen is further improved; the nitrogen has lower cost than argon, and the production cost is further reduced on the premise of meeting the requirement of nitrogen content;
(4) Bottom blowing gas is switched to argon 2 minutes before vacuum breaking by VD, so that nitrogen can be dissolved in molten steel more uniformly, and N component analysis after vacuum breaking is more stable and accurate;
(5) The feeding of the yarn is realized once in a target range, the frequency of feeding the nitrogen yarn is reduced, and the accurate control and the purity control of nitrogen elements are realized.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments.
Example 1
(1) An electric furnace smelting process: the electric furnace tapping temperature is 1630 ℃, the electric furnace is statically boiled for 1 minute before tapping, the furnace body is shaken left and right once, the tapping process is deoxidized, alloyed and slagged, after tapping, the ladle car is driven to a ladle station to stir for 2min with argon, and the argon flow is 240NL/min.
(2) And (3) refining in an LF furnace: the LF refining adopts a bottom nitrogen blowing method in the whole process of arrival, power transmission, recarburization, alloying, wire feeding, soft blowing and other stages. And after the molten steel reaches the LF station, the gas of the ladle bottom blowing pipe is nitrogen. Firstly, measuring the temperature of molten steel, namely measuring the temperature of the molten steel at 1540 ℃, adjusting the nitrogen flow to 120NL/min, measuring the temperature after power is supplied for 10min, and adjusting the nitrogen flow to 30-120NL/min according to different stages of alloying, slagging, wire feeding, soft blowing and the like when the temperature is 1580 ℃. And blowing nitrogen at the bottom of the LF refining for 85min.
(3) VD vacuum process: after the molten steel reaches the VD procedure, the bottom blowing gas is still nitrogen, the nitrogen flow is 50NL/min, the timing is started to keep for 7min when the vacuum degree is 100Pa, and the bottom blowing gas is switched to argon 2 minutes before breaking the vacuum. After the air is broken, a gas sample is taken to analyze that the N content is 125ppm, 150m of high-purity silicon nitride wire is fed once according to the process component range (N: 150-180 ppm), the wire is stirred for 8min after being fed, the N content is 165ppm after the argon flow is 30NL/min by sampling analysis, and the N content enters the process requirement range.
Example 2
1) Electric furnace smelting: the tapping temperature of the electric furnace is 1640 ℃, the electric furnace is statically boiled for 2 minutes before tapping, the furnace body is shaken left and right once, the tapping process is deoxidized, alloyed and slagged, and after tapping, the ladle car is driven to a ladle station to stir for 3 minutes under the condition of large argon, wherein the flow of the argon is 300NL/min.
(2) And (3) refining in an LF (ladle furnace): the LF refining adopts a bottom nitrogen blowing method in the whole process of arrival, power transmission, recarburization, alloying, wire feeding, soft blowing and other stages. And after the molten steel reaches the LF station, the gas of the ladle bottom blowing pipe is nitrogen. Firstly, measuring the temperature of molten steel, adjusting the nitrogen flow to 130NL/min at 1535 ℃, transmitting power for 8min, and then measuring the temperature, and adjusting the nitrogen flow to 30-120NL/min at 1575 ℃ according to different stages of alloying, slagging, wire feeding, soft blowing and the like. And the bottom blowing nitrogen gas time of LF refining is 90min.
(3) VD vacuum process: after the molten steel reaches the VD procedure, the bottom blowing gas is still nitrogen, the nitrogen flow is 60NL/min, the timing is kept for 8min when the vacuum degree is 100Pa, and the bottom blowing gas is switched to argon 2 minutes before the vacuum is broken. After the air is broken, a gas sample is taken to analyze that the N content is 130ppm, a high-purity silicon nitride wire is fed for 180m once according to the process component range (N: 160-190 ppm), the wire is stirred for 10min after being fed, the sampling analysis is carried out after the argon flow is adjusted to be 40NL/min, the N content is 180ppm, and the N content enters the process requirement range.
Example 3
(1) Electric furnace smelting: the electric furnace tapping temperature is 1620 ℃, the electric furnace is statically boiled for 2 minutes before tapping, the furnace body is shaken left and right once, the tapping process is deoxidized, alloyed and slagged, after tapping, the ladle car is driven to a ladle station to stir for 5 minutes under the condition of large argon, and the argon flow is 270NL/min.
(2) And (3) refining in an LF (ladle furnace): the LF refining adopts a bottom nitrogen blowing method in the whole process of arrival, power transmission, recarburization, alloying, wire feeding, soft blowing and other stages. And after the molten steel reaches the LF station, the gas of the ladle bottom blowing pipe is nitrogen. Firstly, measuring the temperature of molten steel, namely 1520 ℃, regulating the nitrogen flow to 180NL/min, transmitting electricity for 15min, and then measuring the temperature, wherein when the temperature is 1580 ℃, the nitrogen flow is regulated to 30-120NL/min according to different stages of alloying, slagging, wire feeding, soft blowing and the like. And the bottom blowing nitrogen gas time of LF refining is 100min.
(3) VD vacuum process: the bottom-blown gas is still nitrogen after the molten steel reaches the VD procedure, the nitrogen flow is 70NL/min, the timing is kept for 10min when the vacuum degree is 100Pa, and the bottom-blown gas is switched to argon 4 minutes before breaking the vacuum. After breaking the air, taking a gas sample to analyze that the N content is 135ppm, feeding a high-purity silicon nitride wire for 200m at one time according to the process component range (N: 160-200 ppm), stirring for 15min after feeding the wire, sampling and analyzing that the N content is 195ppm after adjusting the argon flow to 50NL/min, and allowing the N content to enter the process requirement range.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (10)
1. The method is characterized in that the LF furnace refining process adopts a bottom blowing nitrogen method in the whole process, when the temperature of molten steel is less than or equal to 1550 ℃, the nitrogen flow is controlled to be 100-180NL/min, the temperature is measured after the molten steel is electrified for 5-20min, and when the temperature of the molten steel is more than or equal to 1550 ℃, the nitrogen flow is adjusted to be 30-120NL/min.
2. The method for accurately increasing the nitrogen content of the nitrogen-containing non-quenched and tempered steel according to claim 1, wherein in the electric furnace smelting process, the tapping temperature needs to be more than or equal to 1610 ℃, the steel is statically boiled for 1-2min before tapping, and the furnace body is shaken left and right once.
3. The method for accurately increasing the nitrogen content of the nitrogen-containing non-quenched and tempered steel as claimed in claim 1, wherein in the electric furnace smelting process, argon is added during tapping and stirred for 2-5min, and the flow of the argon is 130-400NL/min.
4. The method for accurately increasing the nitrogen content of the nitrogen-containing non-quenched and tempered steel as claimed in claim 1, wherein in the LF furnace refining process, the time for bottom blowing nitrogen is not less than 80min, and the nitrogen flow is adjusted according to the stages of power transmission, alloying, wire feeding, recarburization and soft blowing, and the adjustment range is 30-150NL/min.
5. The method for accurately increasing nitrogen content in a nitrogen-containing non-heat-treated steel according to claim 1, wherein in the VD vacuum process, nitrogen gas is bottom-blown when the molten steel reaches the VD vacuum process, and the bottom-blown gas is switched to argon gas 2 minutes before breaking.
6. The method for precisely increasing the nitrogen content of the nitrogen-containing non-quenched and tempered steel according to claim 5, wherein the flow rate of the bottom-blown nitrogen gas in the VD vacuum process is 30-80NL/min.
7. The method for precisely increasing the nitrogen content in the nitrogen-containing non-quenched and tempered steel according to claim 5, wherein argon gas is blown from the bottom of the VD vacuum process, and timing is started and maintained for 6-10min when the vacuum degree is less than or equal to 100 Pa.
8. The method for precisely increasing nitrogen content in nitrogen-containing non-heat-treated steel according to claim 5, wherein the bottom-blowing argon gas flow rate is 20 to 60NL/min.
9. The method for accurately increasing the nitrogen content of the nitrogen-containing non-quenched and tempered steel according to claim 5, wherein a gas sample is taken to analyze the N content after the VD vacuum process is broken empty, a nitrogen line is fed at one time according to the target value of the process component, and the nitrogen line is fed and stirred for 5-15min before sampling analysis is carried out to confirm the N content.
10. The method for precisely increasing the nitrogen content in the nitrogen-containing non-quenched and tempered steel according to claim 9, wherein the nitrogen wire is a high-purity silicon nitride or manganese nitride cored wire.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55164019A (en) * | 1979-06-07 | 1980-12-20 | Japan Metals & Chem Co Ltd | Nitrogen adding agent for iron and steel and preparation thereof |
| CN104726646A (en) * | 2015-04-03 | 2015-06-24 | 攀钢集团成都钢钒有限公司 | Method for controlling nitrogen content in high temperature alloy steel P91 |
| CN109234493A (en) * | 2018-10-16 | 2019-01-18 | 南京钢铁股份有限公司 | A kind of method for making steel for stablizing nitrogen pick-up by nitrogen-blow |
| CN110157851A (en) * | 2019-05-15 | 2019-08-23 | 南京钢铁股份有限公司 | A method of improving nitrogenous steel nitrogen recovery rate |
| CN114921612A (en) * | 2022-05-20 | 2022-08-19 | 首钢京唐钢铁联合有限责任公司 | Smelting method for reducing nitrogen content in steel |
-
2022
- 2022-10-28 CN CN202211332779.8A patent/CN115652025B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55164019A (en) * | 1979-06-07 | 1980-12-20 | Japan Metals & Chem Co Ltd | Nitrogen adding agent for iron and steel and preparation thereof |
| CN104726646A (en) * | 2015-04-03 | 2015-06-24 | 攀钢集团成都钢钒有限公司 | Method for controlling nitrogen content in high temperature alloy steel P91 |
| CN109234493A (en) * | 2018-10-16 | 2019-01-18 | 南京钢铁股份有限公司 | A kind of method for making steel for stablizing nitrogen pick-up by nitrogen-blow |
| CN110157851A (en) * | 2019-05-15 | 2019-08-23 | 南京钢铁股份有限公司 | A method of improving nitrogenous steel nitrogen recovery rate |
| CN114921612A (en) * | 2022-05-20 | 2022-08-19 | 首钢京唐钢铁联合有限责任公司 | Smelting method for reducing nitrogen content in steel |
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