CN114214483A - Nitrogen reduction method for smelting high-titanium steel by medium-frequency induction furnace - Google Patents
Nitrogen reduction method for smelting high-titanium steel by medium-frequency induction furnace Download PDFInfo
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
The invention belongs to the technical field of smelting, and particularly relates to a nitrogen reduction method for smelting high titanium steel by a medium-frequency induction furnace. The nitrogen is reduced by blowing calcium carbonate powder into the molten steel in a fractional manner according to the nitrogen content of the molten steel; the calcium carbonate powder can be decomposed into calcium oxide and carbon dioxide at the steelmaking temperature, the calcium oxide is harmless to steel, and the calcium oxide can play a role in purifying slag; the generated carbon dioxide gas is insoluble in the molten steel, and the process of floating upwards from the bottom is equivalent to forming a small vacuum chamber of the molten steel, so that the effect of reducing the partial pressure of the molten steel is achieved, the denitrification reaction is accelerated based on the thermodynamic condition of denitrification, and the precipitation and removal of nitrogen dissolved in the steel are accelerated. The method can stably control the nitrogen content to be 0.0040-0.01% under the conditions that no vacuum condition exists and the stirring nitrogen content increasing amount is uncontrollable when the high-titanium steel is produced by the intermediate frequency furnace.
Description
Technical Field
The invention belongs to the technical field of smelting, and particularly relates to a nitrogen reduction method for smelting high titanium steel by a medium-frequency induction furnace.
Background
With the increasingly stringent requirements of various industries in society on the performance of steel, more and more novel steel grades are developed. In the recent field of wear-resistant steel, a high-grade wear-resistant steel series particle-reinforced by adding Ti element is widely developed. This type of steel has a Ti content of substantially 0.30% or more, has been developed to a Ti content of 0.7% or more in terms of wear resistance, and contains Si, Mn, Mo and the like at the same time. Another characteristic of this type of steel is that the nitrogen content in the steel is required to be kept within a certain range, and the final use of the steel is affected by too high a nitrogen content ([ N ] ≦ 0.007%) or too low a nitrogen content ([ N ] ≦ 0.003%).
Based on the application characteristics of high Ti steel, the condition that nitrogen exceeds the standard in the smelting process often exists due to strong stirring in the smelting process of an intermediate frequency furnace. Because the intermediate frequency furnace can not realize the degassing function under the vacuum condition, the nitrogen must be reasonably controlled in the smelting process of the intermediate frequency furnace so as to reach the target value of the finished product nitrogen; therefore, a method for controlling nitrogen in smelting high titanium steel in a medium frequency induction furnace is urgently needed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a nitrogen reduction method for smelting high-titanium steel by using an intermediate frequency induction furnace, wherein when the titanium content of a finished product is 0.2-0.8%, the nitrogen content of the intermediate frequency furnace is flexibly controlled to be 0.0040-0.01% according to the actual condition of steel types.
In order to achieve the above object, the present invention provides the following technical solutions.
A nitrogen reduction method for smelting high titanium steel by a medium frequency induction furnace comprises the following steps:
step 1, raw material preparation: the raw materials comprise industrial pure iron, metal manganese (containing Mn more than or equal to 98%), sponge titanium (containing Ti more than or equal to 98%), carburant (containing C more than or equal to 90%), ferrosilicon (containing Si more than or equal to 75%), molybdenum (containing Mo more than or equal to 98%), aluminum particles (containing Al more than or equal to 98%), calcium carbonate powder (containing CaCO)3The content is more than or equal to 98 percent), lime (the CaO content is more than or equal to 92 percent), and light-burned dolomite (the CaO content is 35-52 percent and the MgO content is 26-34 percent).
Step 2, feeding: adding molybdenum metal into the furnace, and then placing industrial pure iron into the furnace.
And step 3, smelting.
(1) Adding industrial pure iron into an intermediate frequency furnace for melting, adding a first batch of lime and light-burned dolomite after melting, and controlling the temperature and the content of [ O ]. Adding aluminum particles at one time, adding the aluminum particles, stirring for a certain time, and adding a carburant, metal manganese, ferrosilicon and sponge titanium to achieve the target components.
(2) And adding the 2 nd batch of lime and the light-burned dolomite again, and stirring for a certain time again.
(3) Taking an oxygen and nitrogen sample for nitrogen element content test, adjusting nitrogen element, bottom blowing calcium carbonate powder, and controlling the blowing amount as follows:
firstly, when the nitrogen content of the molten steel is more than 0.010, the amount of the blown calcium carbonate is 3-5 percent of the total amount of the molten steel, and the bottom blowing time is less than or equal to 7min, namely the nitrogen content of the molten steel is controlled to be 0.008-0.01 percent; if the nitrogen content of the molten steel after bottom blowing is more than 0.010, repeating the step until the nitrogen content of the molten steel is controlled to be between 0.008 and 0.01 percent, and performing the step II;
secondly, when the nitrogen content of the molten steel is between 0.008 and 0.01 percent, the amount of the blown calcium carbonate is 5 to 7 percent of the total amount of the molten steel, and the bottom blowing time is less than or equal to 9min, namely the nitrogen content of the molten steel is controlled to be between 0.006 and 0.008 percent; if the nitrogen content of the molten steel after bottom blowing is between 0.008 and 0.01 percent, repeating the step until the nitrogen content of the molten steel is controlled to be between 0.006 and 0.008 percent, and performing the step three;
thirdly, when the nitrogen content of the molten steel is between 0.006 and 0.008 percent, the amount of the blown calcium carbonate is 7 to 9 percent of the total amount of the molten steel, and the bottom blowing time is less than or equal to 10min, namely the nitrogen content of the molten steel is controlled to be between 0.004 and 0.006 percent; if the nitrogen content of the molten steel after bottom blowing is still between 0.006 and 0.008 percent, repeating the step until the nitrogen content of the molten steel is controlled to be between 0.004 and 0.006 percent;
and (4) carrying out molten steel slagging-off after each bottom blowing in the steps, wherein the slag surface is required to cover the liquid level of the molten steel after slagging-off.
And 4, according to the test requirements, blowing calcium carbonate according to the step 3, taking the final oxygen-nitrogen sample and the component sample, and casting the molten steel after meeting the target requirements.
Further, the adding amount of each raw material in the step 1 is as follows: 920-930 kg/t of industrial pure iron, 34-36 kg/t of metal manganese, 4.5-6 kg/t of sponge titanium, 4-4.5 kg/t of carburant, 14-17 kg/t of ferrosilicon, 1.5-2.5 kg/t of metal molybdenum, 0.3-0.5 kg/t of aluminum grain steel, 32-38 kg/t of lime and 12-17 kg/t of light-burned dolomite.
Further, the carburant in the step 1 is 90 carburant, and the carbon content is more than or equal to 90%.
Further, in the step 3 (1), the first lime adding amount is 2/3 of the total lime, and the light burned dolomite adding amount is 2/3 of the total light burned dolomite.
Further, the aluminum particles are added in the step 3 (1) and stirred for 1-3 min.
Furthermore, in the step 3 (1), the temperature is 1490-1520 ℃ and the content of [ O ] is 80-150 ppm.
Furthermore, in the step 3 (1), the target components are 0.38-0.42 wt% of C, 1.0-1.35 wt% of Si, 3.2-3.65 wt% of Mn, less than or equal to 0.015 wt% of P, less than or equal to 0.005 wt% of S, 0.45-0.55 wt% of Ti, 0.18-0.25 wt% of Mo, 0.01-0.035 wt% of Al and 0.004-0.006 wt% of N.
Further, in the step 3 (2), the adding amount of the second batch of lime is 1/3 of the total amount of lime, and the adding amount of the light burned dolomite is 1/3 of the total amount of the light burned dolomite.
Further, the stirring time in the step 3 (2) is 3-5 min.
Compared with the prior art, the invention has the beneficial effects that.
1. Calcium carbonate powder can be decomposed into calcium oxide and carbon dioxide at the steel-making temperature. The calcium oxide is harmless to steel and can play a role in purifying slag materials, the calcium oxide powder decomposed from the calcium carbonate sprayed each time floats to the slag surface and is removed through slag skimming of molten steel, and negative effects on the molten steel cannot be played. The generated carbon dioxide gas is insoluble in the molten steel, and the process of floating upwards from the bottom is equivalent to forming a small vacuum chamber of the molten steel, thereby playing the role of reducing the partial pressure of the molten steel. Based on the thermodynamic conditions of denitrification, the denitrification reaction is accelerated, and the precipitation and removal of nitrogen dissolved in steel are accelerated.
2. The method can stably control the nitrogen content to be 0.0040-0.01% under the conditions that no vacuum condition exists and the stirring nitrogen content increasing amount is uncontrollable when the high-titanium steel is produced by the intermediate frequency furnace.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A nitrogen reduction method for smelting high titanium steel by a medium frequency induction furnace comprises the following steps:
step 1, raw material preparation: the raw materials comprise industrial pure iron, metal manganese (containing Mn more than or equal to 98%), sponge titanium (containing Ti more than or equal to 98%), carburant (containing C more than or equal to 90%), ferrosilicon (containing Si more than or equal to 75%), molybdenum (containing Mo more than or equal to 98%), aluminum particles (containing Al more than or equal to 98%), calcium carbonate powder (containing CaCO)3The content is more than or equal to 98 percent), lime (the CaO content is more than or equal to 92 percent), and light-burned dolomite (the CaO content is 35-52 percent and the MgO content is 26-34 percent).
Step 2, feeding: adding molybdenum metal into the furnace, and then placing industrial pure iron into the furnace.
And step 3, smelting.
(1) Adding industrial pure iron into an intermediate frequency furnace for melting, adding a first batch of lime and light-burned dolomite after melting, and controlling the temperature and the content of [ O ]. Adding aluminum particles at one time, adding the aluminum particles, stirring for a certain time, and adding a carburant, metal manganese, ferrosilicon and sponge titanium to achieve the target components.
(2) And adding the 2 nd batch of lime and the light-burned dolomite again, and stirring for a certain time again.
(3) Taking an oxygen and nitrogen sample for nitrogen element content test, adjusting nitrogen element, bottom blowing calcium carbonate powder, and controlling the blowing amount as follows:
firstly, when the nitrogen content of the molten steel is more than 0.010, the amount of the blown calcium carbonate is 3-5 percent of the total amount of the molten steel, and the bottom blowing time is less than or equal to 7min, namely the nitrogen content of the molten steel is controlled to be 0.008-0.01 percent; if the nitrogen content of the molten steel after bottom blowing is more than 0.010, repeating the step until the nitrogen content of the molten steel is controlled to be between 0.008 and 0.01 percent, and performing the step II;
secondly, when the nitrogen content of the molten steel is between 0.008 and 0.01 percent, the amount of the blown calcium carbonate is 5 to 7 percent of the total amount of the molten steel, and the bottom blowing time is less than or equal to 9min, namely the nitrogen content of the molten steel is controlled to be between 0.006 and 0.008 percent; if the nitrogen content of the molten steel after bottom blowing is between 0.008 and 0.01 percent, repeating the step until the nitrogen content of the molten steel is controlled to be between 0.006 and 0.008 percent, and performing the step three;
thirdly, when the nitrogen content of the molten steel is between 0.006 and 0.008 percent, the amount of the blown calcium carbonate is 7 to 9 percent of the total amount of the molten steel, and the bottom blowing time is less than or equal to 10min, namely the nitrogen content of the molten steel is controlled to be between 0.004 and 0.006 percent; if the nitrogen content of the molten steel after bottom blowing is still between 0.006 and 0.008 percent, repeating the step until the nitrogen content of the molten steel is controlled to be between 0.004 and 0.006 percent;
and (4) carrying out molten steel slagging-off after each bottom blowing in the steps, wherein the slag surface is required to cover the liquid level of the molten steel after slagging-off.
And 4, according to the test requirements, blowing calcium carbonate according to the step 3, taking the final oxygen-nitrogen sample and the component sample, and casting the molten steel after meeting the target requirements.
Further, the adding amount of each raw material in the step 1 is as follows: 920-930 kg/t of industrial pure iron, 34-36 kg/t of metal manganese, 4.5-6 kg/t of sponge titanium, 4-4.5 kg/t of carburant, 14-17 kg/t of ferrosilicon, 1.5-2.5 kg/t of metal molybdenum, 0.3-0.5 kg/t of aluminum grain steel, 32-38 kg/t of lime and 12-17 kg/t of light-burned dolomite.
Further, the carburant in the step 1 is 90 carburant, and the carbon content is more than or equal to 90%.
Further, in the step 3 (1), the first lime adding amount is 2/3 of the total lime, and the light burned dolomite adding amount is 2/3 of the total light burned dolomite.
Further, the aluminum particles are added in the step 3 (1) and stirred for 1-3 min.
Furthermore, in the step 3 (1), the temperature is 1490-1520 ℃ and the content of [ O ] is 80-150 ppm.
Furthermore, in the step 3 (1), the target components are 0.38-0.42 wt% of C, 1.0-1.35 wt% of Si, 3.2-3.65 wt% of Mn, less than or equal to 0.015 wt% of P, less than or equal to 0.005 wt% of S, 0.45-0.55 wt% of Ti, 0.18-0.25 wt% of Mo, 0.01-0.035 wt% of Al and 0.004-0.006 wt% of N.
Further, in the step 3 (2), the adding amount of the second batch of lime is 1/3 of the total amount of lime, and the adding amount of the light burned dolomite is 1/3 of the total amount of the light burned dolomite.
Further, the stirring time in the step 3 (2) is 3-5 min.
Three tests of the examples were all carried out in a 500kg medium frequency induction furnace.
Example 1.
Step 1, raw material preparation: 462kg of industrial pure iron, 17.6kg of metal manganese, 2.5kg of sponge titanium, 2.2kg of carburant, 8kg of ferrosilicon, 1kg of metal molybdenum, 0.2kg of aluminum particles, 90kg of calcium carbonate powder, 17.5kg of lime and 7.5kg of light-burned dolomite;
step 2, feeding: adding 1kg of metal molybdenum into a furnace, and then putting 462kg of industrial pure iron into the furnace;
step 3, smelting:
1. adding industrial pure iron into an intermediate frequency furnace for melting, adding 11.5kg of lime and 5kg of light-burned dolomite after melting, measuring the temperature at 1510 ℃, and determining the oxygen to be 110 ppm. Adding 0.2kg of aluminum particles, stirring for 2.5min, and adding 17.6kg of metal manganese, 2.5kg of sponge titanium, 2.2kg of carburant and 8kg of ferrosilicon to reach the target components;
2. adding lime 6kg and light-burned dolomite 2.5kg, and stirring for 3.2 min;
3. taking oxygen and nitrogen samples, wherein the actual detection value of nitrogen element is [ N ] = 0.0108%. 20kg of bottom-blown calcium carbonate powder, bottom-blown for 4.5min, taking an oxygen-nitrogen sample, wherein the actual detection value of nitrogen element is [ N ] =0.0085%, and slagging off molten steel; 30kg of calcium carbonate powder is blown at the bottom again, 5.2min of bottom blowing is carried out, an oxygen nitrogen sample is taken, the actual detection value of nitrogen element is [ N ] =0.0066%, and slag removal is carried out on the molten steel; and (3) bottom blowing 40kg of calcium carbonate powder for 5.5min, taking an oxygen-nitrogen sample, reaching a target value when the actual detection value of nitrogen element is [ N ] =0.0045%, and die casting.
Example 2.
Step 1, raw material preparation: 462kg of industrial pure iron, 17.6kg of metal manganese, 2.5kg of sponge titanium, 2.2kg of carburant, 8kg of ferrosilicon, 1kg of metal molybdenum, 0.2kg of aluminum particles, 90kg of calcium carbonate powder, 17.5kg of lime and 7.5kg of light-burned dolomite;
step 2, feeding: adding 1kg of metal molybdenum into a furnace, and then putting 462kg of industrial pure iron into the furnace;
step 3, smelting:
1. adding industrial pure iron into an intermediate frequency furnace for melting, adding 11.5kg of lime and 5kg of light-burned dolomite after melting, measuring the temperature at 1517 ℃, and determining the oxygen content at 118 ppm. Adding 0.2kg of aluminum particles, stirring for 2.3min, and adding 17.6kg of metal manganese, 2.5kg of sponge titanium, 2.2kg of carburant and 8kg of ferrosilicon to reach the target components;
2. adding lime 6kg and light-burned dolomite 2.5kg, and stirring for 3.3 min;
3. taking oxygen and nitrogen samples, wherein the actual detection value of nitrogen element is [ N ] = 0.011%. 20kg of bottom-blown calcium carbonate powder, bottom-blown for 4.3min, taking an oxygen-nitrogen sample, wherein the actual detection value of nitrogen element is [ N ] =0.0089%, and slagging off molten steel; 30kg of calcium carbonate powder is blown at the bottom again, 5.7min of bottom blowing is carried out, an oxygen nitrogen sample is taken, the actual detection value of nitrogen element is [ N ] =0.0063%, and slag removal is carried out on the molten steel; and (3) bottom blowing 40kg of calcium carbonate powder for 5.8min, taking an oxygen-nitrogen sample, reaching a target value when the actual detection value of nitrogen element is [ N ] =0.0043%, and die casting.
Example 3.
Step 1, raw material preparation: 462kg of industrial pure iron, 17.6kg of metal manganese, 2.5kg of sponge titanium, 2.2kg of carburant, 8kg of ferrosilicon, 1kg of metal molybdenum, 0.2kg of aluminum particles, 70kg of calcium carbonate powder, 17.5kg of lime and 7.5kg of light-burned dolomite;
step 2, feeding: adding 1kg of metal molybdenum into a furnace, and then putting 462kg of industrial pure iron into the furnace;
step 3, smelting:
1. adding industrial pure iron into an intermediate frequency furnace for melting, adding 11.5kg of lime and 5kg of light-burned dolomite after melting, measuring the temperature of 1502 ℃, and determining the oxygen to be 97 ppm. Adding 0.2kg of aluminum particles, stirring for 2.3min, and adding 17.6kg of metal manganese, 2.5kg of sponge titanium, 2.2kg of carburant and 8kg of ferrosilicon to reach the target components;
2. adding lime 6kg and light-burned dolomite 2.5kg, and stirring for 3.3 min;
3. taking oxygen and nitrogen samples, the actual detection value of nitrogen element is [ N ] = 0.0092%. 30kg of bottom-blown calcium carbonate powder, 6.8min of bottom blowing, taking an oxygen-nitrogen sample, wherein the actual detection value of nitrogen element is [ N ] =0.0070%, and slagging off molten steel; and (3) bottom blowing of 40kg of calcium carbonate powder for 7.2min, taking an oxygen-nitrogen sample, reaching a target value when the actual detection value of nitrogen element is [ N ] =0.0049%, and die casting.
Table 1 final composition wt% of the ingots of examples 1-3.
Claims (10)
1. The nitrogen reduction method for smelting high titanium steel by using the medium frequency induction furnace is characterized by comprising the following steps of:
step 1, raw material preparation: the raw materials comprise industrial pure iron, metal manganese, sponge titanium, a recarburizer, ferrosilicon, metal molybdenum, aluminum particles, calcium carbonate powder, lime and light-burned dolomite;
step 2, feeding: adding molybdenum into the furnace, and then placing industrial pure iron into the furnace;
step 3, smelting;
(1) adding industrial pure iron into an intermediate frequency furnace for melting, adding a first batch of lime and light-burned dolomite after melting, controlling the temperature and the oxygen content, adding aluminum particles at one time, adding the aluminum particles, stirring for a certain time, and adding a carburant, metal manganese, ferrosilicon and sponge titanium to achieve target components;
(2) adding the 2 nd batch of lime and the light-burned dolomite again, and stirring for a certain time again;
(3) taking an oxygen and nitrogen sample for nitrogen element content test, adjusting nitrogen element, bottom blowing calcium carbonate powder, and controlling the blowing amount as follows:
firstly, when the nitrogen content of the molten steel is more than 0.010, the amount of the blown calcium carbonate is 3-5 percent of the total amount of the molten steel, and the bottom blowing time is less than or equal to 7min, namely the nitrogen content of the molten steel is controlled to be 0.008-0.01 percent; if the nitrogen content of the molten steel after bottom blowing is more than 0.010, repeating the step until the nitrogen content of the molten steel is controlled to be between 0.008 and 0.01 percent, and performing the step II;
secondly, when the nitrogen content of the molten steel is between 0.008 and 0.01 percent, the amount of the blown calcium carbonate is 5 to 7 percent of the total amount of the molten steel, and the bottom blowing time is less than or equal to 9min, namely the nitrogen content of the molten steel is controlled to be between 0.006 and 0.008 percent; if the nitrogen content of the molten steel after bottom blowing is between 0.008 and 0.01 percent, repeating the step until the nitrogen content of the molten steel is controlled to be between 0.006 and 0.008 percent, and performing the step three;
thirdly, when the nitrogen content of the molten steel is between 0.006 and 0.008 percent, the amount of the blown calcium carbonate is 7 to 9 percent of the total amount of the molten steel, and the bottom blowing time is less than or equal to 10min, namely the nitrogen content of the molten steel is controlled to be between 0.004 and 0.006 percent; if the nitrogen content of the molten steel after bottom blowing is still between 0.006 and 0.008 percent, repeating the step until the nitrogen content of the molten steel is controlled to be between 0.004 and 0.006 percent;
after each bottom blowing in the steps, slagging off the molten steel, wherein the slag surface is required to cover the liquid level of the molten steel after slagging off;
and 4, according to the test requirements, blowing calcium carbonate according to the step 3, taking the final oxygen-nitrogen sample and the component sample, and casting the molten steel after meeting the target requirements.
2. The nitrogen reduction method for smelting high titanium steel in an intermediate frequency induction furnace according to claim 1, wherein in step 1, the Mn content in metal manganese is not less than 98%, the Ti content in sponge titanium is not less than 98%, the C content in a recarburizing agent is not less than 90%, the Si content in silicon iron is not less than 75%, the Mo content in metal molybdenum is not less than 98%, the Al content in aluminum particles is not less than 98%, and CaCO in calcium carbonate powder3The content of the calcium oxide is more than or equal to 98 percent, the content of CaO in lime is more than or equal to 92 percent, the content of CaO in light-burned dolomite is 35-52 percent, and the content of MgO is 26-34 percent.
3. The nitrogen reduction method for smelting high titanium steel by using the medium frequency induction furnace according to claim 1, wherein the addition amount of each raw material in the step 1 is as follows: 920-930 kg/t of industrial pure iron, 34-36 kg/t of metal manganese, 4.5-6 kg/t of sponge titanium, 4-4.5 kg/t of carburant, 14-17 kg/t of ferrosilicon, 1.5-2.5 kg/t of metal molybdenum, 0.3-0.5 kg/t of aluminum grain steel, 32-38 kg/t of lime and 12-17 kg/t of light-burned dolomite.
4. The nitrogen reduction method for smelting high titanium steel by using the medium frequency induction furnace according to claim 1, wherein the carburant in the step 1 is a 90-carburant, and the carbon content is not less than 90%.
5. The nitrogen reduction method for smelting high titanium steel by using the medium frequency induction furnace as claimed in claim 1, wherein in the step 3 (1), the addition amount of the first lime is 2/3 of the total amount of lime, and the addition amount of the light burned dolomite is 2/3 of the total amount of the light burned dolomite.
6. The nitrogen reduction method for smelting high titanium steel in the medium frequency induction furnace according to claim 1, wherein aluminum particles are added in the step 3 (1) and stirred for 1-3 min.
7. The nitrogen reduction method for smelting high titanium steel in the medium frequency induction furnace according to claim 1, wherein the temperature in the step 3 (1) is 1490-1520 ℃, and the oxygen content is 80-150 ppm.
8. The nitrogen reduction method for smelting high titanium steel in an intermediate frequency induction furnace according to claim 1, wherein the targets in step 3 (1) are 0.38-0.42 wt% of C, 1.0-1.35 wt% of Si, 3.2-3.65 wt% of Mn, less than or equal to 0.015 wt% of P, less than or equal to 0.005 wt% of S, 0.45-0.55 wt% of Ti, 0.18-0.25 wt% of Mo, 0.01-0.035 wt% of Al, and 0.004-0.006 wt% of N.
9. The nitrogen reduction method for smelting high titanium steel by using the medium frequency induction furnace as claimed in claim 1, wherein in the step 3 (2), the addition amount of the second batch of lime is 1/3 of the total amount of lime, and the addition amount of the light burned dolomite is 1/3 of the total amount of the light burned dolomite.
10. The nitrogen reduction method for smelting high titanium steel in the medium frequency induction furnace according to claim 1, wherein the stirring time in the step 3 (2) is 3-5 min.
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| CN113416812A (en) * | 2021-08-25 | 2021-09-21 | 北京科技大学 | Nitrogen reduction method for high-alloy and high-vanadium steel |
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