CN114959163B - Alloying smelting method in converter - Google Patents
Alloying smelting method in converter Download PDFInfo
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- CN114959163B CN114959163B CN202210771759.4A CN202210771759A CN114959163B CN 114959163 B CN114959163 B CN 114959163B CN 202210771759 A CN202210771759 A CN 202210771759A CN 114959163 B CN114959163 B CN 114959163B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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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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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The application provides a method for alloying smelting in a converter, which comprises the steps of adding molten iron and scrap steel into the converter; oxygen blowing smelting is carried out in the converter, and argon is blown at the bottom of the converter at the same time; controlling the total slag amount in the converter to be 20-35 kg/t; after stopping blowing oxygen, adding high-carbon ferrochrome from a top bin of the converter, lifting argon flow to perform bottom blowing stirring, and implementing molten steel alloying in the converter; and detecting molten steel, tapping after meeting the smelting requirements, and carrying out supplementary blowing if the molten steel does not meet the smelting requirements. The application can realize the low-slag steelmaking by controlling the total slag quantity in the converter to be 20-35 kg/t, and avoid excessive slag while meeting the dephosphorization effect of slag on molten steel, and form a thicker slag layer on the upper part of the molten steel to influence the high-carbon ferrochrome to pass through the slag layer, so that the high-carbon ferrochrome cannot be completely melted into the molten steel to influence the effect of chromium alloying.
Description
Technical Field
The application relates to the technical field of steel smelting, in particular to an alloying smelting method in a converter.
Background
The high-carbon chromium bearing steel is used for manufacturing bearing parts such as rolling bodies, ferrules and the like in the bearing, and the parts have strict requirements on contact fatigue life. The nonmetallic inclusion in the bearing steel has a great influence on the fatigue life, especially the brittle titanium nitride inclusion, and the related research result shows that the influence of the titanium nitride inclusion with the size of 8um on the fatigue life is equivalent to the influence of the calcium aluminate inclusion with the size of 25 um. Therefore, the high-carbon chromium bearing steel has very strict requirements on the titanium content in the steel, the high-quality steel in the new standard GB/T18254-2016 of the high-carbon chromium bearing steel has the titanium content (namely, the mass percent) of less than or equal to 0.0050 percent, the high-quality steel has the titanium content of less than or equal to 0.0030 percent, and the superfine high-quality steel has the titanium content of less than or equal to 0.0015 percent, so the production of the high-carbon chromium bearing steel has very strict requirements on molten iron, alloy and the like.
In order to ensure that the titanium content in the high-carbon chromium bearing steel meets the standard requirement, the iron and steel enterprises have to adopt low-titanium high-carbon ferrochrome to replace common high-carbon ferrochrome for chromium alloying operation, thereby greatly increasing the production cost. In order to ensure the titanium content requirement in the high-carbon chromium bearing steel and reduce the production cost, a great deal of new process research is carried out by steel enterprises.
The patent with publication number CN104212935B discloses a method for producing high-quality GCr15 bearing steel by using high-carbon ferrochrome, wherein three slag forming processes are adopted in LF and RH processes to remove titanium in the steel, but the method needs slag removing operation in the LF process and secondary slag forming is repeated, so that slag removing equipment is required to be added in the LF process, the slag amount cost is greatly increased, and the production cost after chromium alloying is increased to a certain extent.
The patent with publication number CN102383055B discloses a production method for reducing the titanium content of high-carbon chromium bearing steel, and adopts a mode of mixing high-carbon ferrochrome (60-75% of Cr required alloy amount) and low-titanium high-carbon ferrochrome in the steel tapping alloying process, although the titanium content of a finished product and the alloying cost are considered to a certain extent, the titanium content of the finished product is greatly influenced by the titanium content of the high-carbon ferrochrome.
Therefore, in the molten steel smelting process of the high-carbon chromium bearing steel, the absorptivity of the molten steel to the high-carbon chromium iron is ensured, the content of various elements in the molten steel is ensured to meet smelting requirements, the Ti content in the molten steel is reduced, and the dephosphorization load in the smelting process is reduced.
In view of the foregoing, there is a great need for a method for alloying and smelting in a converter to solve the problems in the prior art.
Disclosure of Invention
The application aims to provide a converter internal alloying smelting method which aims to solve the problem of low absorptivity of alloy materials in the existing alloying smelting process.
In order to achieve the above purpose, the application provides a converter furnace alloying smelting method, which comprises the following steps:
step one: adding molten iron and scrap steel into a converter;
step two: oxygen blowing smelting is carried out in the converter, and argon is blown at the bottom of the converter at the same time; controlling the total slag amount in the converter to be 20-35 kg/t;
step three: after stopping blowing oxygen, adding high-carbon ferrochrome from a top bin of the converter, lifting argon flow to perform bottom blowing stirring, and implementing molten steel alloying in the converter;
step four: and detecting molten steel, and tapping after the molten steel meets smelting requirements.
Preferably, in the step one molten iron: the mass percentage of Si is below 0.35%, the mass percentage of P is below 0.08%, and the mass percentage of Ti is below 0.06%.
Preferably, in the first step, the mass ratio of the added scrap steel is below 20%.
Preferably, in the second step, the oxygen supply strength is 1.5 to 3.0Nm when oxygen blowing smelting is performed 3 The oxygen pressure is 0.70-0.90 Mpa; when argon is blown from bottom, the flow rate of the argon is 0.03-0.20 Nm 3 /(t·min)。
Preferably, in the second step, a slag former is added into the converter to form slag in the converter, and the alkalinity of the slag is 3-4.5.
Preferably, in the third step, the oxygen blowing is stopped when the mass percentage of C in the molten steel is 0.08-0.20% and the temperature of the molten steel is 1560-1600 ℃.
Preferably, in the third step, the argon flow is increased to 0.20-0.35 Nm 3 /(t·min)，The bottom blowing stirring time is 30-60 s.
Preferably, in the fourth step, when the mass percentage of P in the molten steel meets the requirement, and the mass percentage of C in the molten steel is 0.06-0.20%, and the temperature of the molten steel is 1540-1590 ℃, the smelting requirement is met.
Preferably, in the fourth step, if the molten steel does not meet the smelting requirement, the supplementary blowing is performed until the molten steel meets the smelting requirement.
Preferably, the supplementary blowing is specifically to perform supplementary blowing oxygen smelting inside a converter and supplementary blowing argon gas at the bottom of the converter, wherein: the oxygen supply strength of the supplementary blowing is 0.8-1.5 Nm 3 And (t.min), the flow rate of the argon is 0.20-0.35 Nm 3 And (t.min), wherein the blowing time is below 30s.
The technical scheme of the application has the following beneficial effects:
(1) According to the application, the total slag amount in the converter is controlled to be 20-35 kg/t, so that the small-slag steelmaking can be realized, the dephosphorization effect of slag on molten steel is met, meanwhile, excessive slag is avoided, a thicker slag layer is formed on the upper part of the molten steel, the high-carbon ferrochrome is influenced to pass through the slag layer, the high-carbon ferrochrome cannot be completely melted into the molten steel, and the chromium alloying effect is influenced.
(2) In the application, the mass percentages of P, ti and Si in the molten iron added into the converter are lower, and the formed slag amount is also lower; the mass percentage of P (phosphorus) in the molten iron is below 0.08%, so that dephosphorization load in the converter smelting process can be reduced; the mass percentage of Ti (titanium) is below 0.06 percent, and the Ti is almost totally oxidized into TiO in the smelting process due to the higher activity 2 Is favorable for meeting the titanium content standard of high-carbon chromium bearing steel.
(3) According to the application, the scrap steel is added into the converter, so that the use of molten iron can be reduced, the steelmaking cost can be reduced, the cooling effect can be realized in the blowing process, and the disadvantage of excessively high temperature of molten steel on dephosphorization can be avoided.
(4) According to the application, oxygen is introduced into the top of the converter for blowing, so that the smelting speed is high, and inert gas is introduced into the bottom of the converter, so that the purposes of accelerating molten steel melting and promoting the metallurgical reaction process can be achieved.
(5) In the application, when oxygen blowing smelting is carried out, the oxygen supply strength is 1.5-3.0 Nm 3 The oxygen pressure is 0.70-0.90 Mpa; when argon is blown from bottom, the flow rate of the argon is 0.03-0.20 Nm 3 And (t.min), the blowing process can be stably controlled, and the dephosphorization effect is ensured.
(6) In the application, the mass percent of C in molten steel and the temperature of the molten steel are controlled before alloying, if the content of C in the molten steel is higher, dephosphorization of the molten steel is not facilitated, if the content of C in the molten steel is lower, the content of O in the molten steel is high, and when the molten steel is alloyed, the alloy material is more active, oxidation reaction is carried out with O in the molten steel firstly, and then the alloy material is alloyed with the molten steel, so that the absorptivity of the molten steel to alloy elements is influenced.
(7) In the application, the oxygen supply strength and the blowing time are greatly reduced during the blowing, and the P element in the steel can be further removed or the temperature of the molten steel is slightly raised, so that the molten steel meets the tapping condition; the oxygen supply strength is too high, the oxidation amount of chromium element in the molten steel is increased, the alloy absorptivity is reduced, the oxygen supply strength is reasonably combined with the oxygen supply time, and the molten steel is further dephosphorized or heated so that the molten steel in the furnace meets the tapping condition.
In addition to the objects, features and advantages described above, the present application has other objects, features and advantages. The present application will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a flow chart of a method for alloying smelting in a converter according to embodiment 1 of the present application.
Detailed Description
Embodiments of the application are described in detail below with reference to the attached drawings, but the application can be implemented in a number of different ways, which are defined and covered by the claims.
Example 1:
referring to fig. 1, the embodiment is applied to smelting of low-titanium high-carbon chromium bearing steel by an alloying smelting method in a converter.
An alloying smelting method in a converter comprises the following steps:
step one: adding molten iron and scrap steel into a converter;
molten iron is added into the converter, the mass percentage of P (phosphorus) in the molten iron is below 0.08%, the dephosphorization load in the smelting process of the converter can be reduced, and P is changed into P after being oxidized in the smelting process 2 O 5 The method comprises the steps of carrying out a first treatment on the surface of the The mass percentage of Ti (titanium) in the molten iron is below 0.06 percent, and the Ti is almost totally oxidized into TiO in the smelting process due to the higher activity 2 The titanium content standard of the high-carbon chromium bearing steel is favorably met; the mass percentage of Si (silicon) in the molten iron is below 0.35 percent, and Si is oxidized to be changed into SiO in the smelting process 2 ；P 2 O 5 、TiO 2 And SiO 2 Eventually becomes slag in the converter, and the amount of slag formed is small because the mass percentages (i.e., the contents) of P, ti and Si in the molten iron added to the converter are low. In this embodiment, in the molten iron: the mass percent of P is 0.08%, the mass percent of Ti is 0.06%, and the mass percent of Si is 0.35%.
The mass ratio of the scrap steel added into the converter is below 20%, the use of molten iron can be reduced by adding the scrap steel, the steelmaking cost is reduced, the cooling effect can be achieved in the blowing process, and the defect that dephosphorization is unfavorable due to the fact that the temperature of molten steel is too high is avoided.
Step two: oxygen blowing smelting is carried out in the converter, and argon is blown at the bottom of the converter at the same time; controlling the total slag quantity in the converter to be 20-35 kg/t and the slag alkalinity to be 3-4.5;
the essence of converter smelting is to blow oxygen into the furnace to oxidize C, si, mn, P and other elements in molten iron, and finally obtain primary molten steel meeting the conditions of C content, P content, temperature, etc.
Oxygen is introduced into the top of the converter to oxidize the molten iron in the converter, so that P, ti and Si in the molten iron are respectively oxidized into P 2 O 5 、TiO 2 And SiO 2 The method reduces the mass percentage of P, ti in the primary molten steel and forms slag at the same time, thereby facilitating further dephosphorization of the molten steel by the slag.
The oxygen top-blown converter steelmaking method has the advantages of high smelting speed, more steel types, better quality and the like, and the purpose of accelerating melting and promoting the metallurgical reaction process can be achieved by introducing inert gas into the bottom of the converter.
In this example, the oxygen supply strength was 1.5 to 3.0Nm in the case of oxygen blowing smelting 3 The oxygen pressure is 0.70-0.90 Mpa; when argon is blown from bottom, the flow rate of the argon is 0.03-0.20 Nm 3 And (t.min), the blowing process can be stably controlled, and the dephosphorization effect is ensured.
In the converting process, a slag former, such as calcium fluoride or calcium oxide, is added to the converter for forming slag in the converter. With P formed by oxidation of P, ti and Si in molten iron 2 O 5 、TiO 2 And SiO 2 Together play a role of slag to dephosphorize molten steel.
The total slag amount of the finally formed slag is 20-35 kg/t which is far lower than 50kg/t in the conventional process, and because the slag floats on the upper part of the molten steel, when the alloy material is added, the thickness of a slag layer is reduced by controlling the total slag amount, the resistance of the alloy material passing through the slag layer can be reduced, and the absorptivity of the molten steel to the alloy material is further improved; the alkalinity of slag is 3-4.5, proper alkalinity is a necessary condition for dephosphorization in the converting process, and the alkalinity is controlled to be 3-4.5, so that the dephosphorization rate of the converter can be improved to a certain extent, and the implementation of an alloying process in the converter is ensured.
In this example, the total slag amount in the converter was 35kg/t, and the slag basicity was 4.5.
Step three: after stopping blowing oxygen, adding high-carbon ferrochrome from a top bin of the converter, lifting argon flow to perform bottom blowing stirring, and implementing molten steel alloying in the converter;
stopping blowing oxygen when the mass percentage of C in the molten steel is 0.08-0.20% and the temperature of the molten steel is 1560-1600 ℃; if the C content in the molten steel is higher, dephosphorization of the molten steel is not facilitated, if the C content in the molten steel is lower, the O content in the molten steel is high, and when alloying the molten steel, oxidation reaction is carried out on the alloy material chromium and the O in the molten steel firstly, and then the alloy material chromium and the molten steel are alloyed, so that the absorptivity of the molten steel to alloy elements is influenced. In the embodiment, the mass percentage of C in the molten steel is 0.08%, oxygen blowing is stopped when the temperature is 1600 ℃, and temperature measurement and sampling are carried out on the molten steel.
Adding high-carbon ferrochrome into the top bin of the converter, enabling the high-carbon ferrochrome to penetrate through the slag layer and enter molten steel, and implementing chromium alloying operation in the converter; after adding high-carbon ferrochrome into the converter, the argon flow is raised to 0.20-0.35 Nm 3 And (3) carrying out bottom blowing stirring for 30-60 s, so as to accelerate the melting of the high-carbon ferrochrome in the molten steel and ensure that the high-carbon ferrochrome is completely melted into the molten steel. In this example, the bottom blowing agitation time was 30s.
Step four: and detecting molten steel, and tapping after the molten steel meets smelting requirements.
When the P content in the molten steel meets the requirement, the mass percentage of C in the molten steel is 0.06-0.20%, and the temperature of the molten steel is 1540-1590 ℃, the molten steel is regarded as meeting the smelting requirement, and the steel can be tapped.
If the molten steel does not meet the smelting requirement (namely, the P content exceeds the standard, the temperature of the molten steel is lower than 1540 ℃, and the like), oxygen and argon are again introduced for supplementary blowing, so that the temperature of the molten steel is increased or dephosphorization treatment is further carried out on the molten steel.
When the supplementary blowing is carried out, the oxygen supply strength is 0.8 to 1.5Nm 3 The flow rate of bottom blowing argon is 0.20-0.35 Nm 3 The blowing time is below 30s, the high-carbon ferrochrome in the converter is added and the chromium is alloyed, the molten steel contains a certain amount of chromium, the larger oxygen supply strength can enable the alloyed chromium to react with blown oxygen in a large amount, the high-carbon ferrochrome absorption rate is reduced, the production cost is increased, the oxygen supply strength and the blowing time are greatly reduced during the supplementary blowing, and the main purpose is to further remove P element in the steel or slightly improve the temperature of the molten steel, so that the molten steel meets the tapping condition; the oxygen supply strength is too high, the oxidation amount of chromium element in the molten steel is increased, the alloy absorptivity is reduced, the oxygen supply strength is reasonably combined with the oxygen supply time, and the molten steel dephosphorization or the temperature rise is further carried out to ensure that the molten steel in the furnace meets the requirementsTapping conditions.
In this example, the oxygen supply intensity at the time of the supplementary blowing was 0.8Nm 3 /(t.min), the flow rate of bottom-blown argon was 0.20Nm 3 And/(t.min), the supplementary blowing time was 30s.
Example 2:
this example differs from example 1 in that the total slag amount in the transfer furnace of the present application was 20kg/t and the slag basicity was 3.0.
Example 3:
the difference between this example and example 1 is that the total slag amount in the transfer furnace of this example was 30kg/t and the slag basicity was 4.5.
Example 4:
the difference between this example and example 1 is that in step three of this example, the mass percentage of C in the molten steel is 0.20%, the molten steel temperature is 1560 ℃, the bottom blowing stirring time of bottom blowing argon is 60s, and no supplementary blowing operation is performed after tapping.
Example 5:
this example differs from example 1 in that the oxygen supply strength in this example was 1.5Nm when the supplementary blowing was performed 3 /(t.min), the flow rate of bottom-blown argon was 0.35Nm 3 /(t·min)。
Example 6:
the difference between this example and example 1 is that in step three of this example, the mass percentage of C in the molten steel is 0.15%.
Comparative example 1:
the comparative example is different from example 1 in that the alloying operation is performed in a chromium-free iron furnace, and the high carbon ferrochrome is added into a ladle for alloying operation after the molten steel is subjected to oxygen blowing smelting.
Comparative example 2:
the comparative example is different from example 1 in that the mass percentage of Si in the molten iron of the comparative example is more than 0.35%, 0.40%, and the total slag amount in the converter is 50kg/t.
Comparative example 3:
the comparative example is different from example 1 in that the mass percentage of P in the molten iron of the comparative example is more than 0.08%, 0.125%, and the total slag amount in the converter is 35kg/t.
Comparative example 4:
the difference between this comparative example and example 1 is that the oxygen supply strength was 2.0Nm when the supplementary blowing was performed 3 /(t.min), the flow rate of bottom-blown argon was 0.15Nm 3 And/(t.min), the blowing time was 120s.
Comparative example 5:
the main difference between this comparative example and example 1 is that less slag former was added to this comparative example so that the total slag amount inside the converter was 15kg/t.
Comparative example 6:
the main difference between this comparative example and example 1 is that in this comparative example, the mass percentage of C in the molten steel in the third step is 0.05%.
Comparative example 7:
the main difference between this comparative example and example 1 is that in this comparative example, the mass percentage of C in the molten steel in the third step is 0.25%.
TABLE 1 influence of the steps on the smelting effect
As is clear from Table 1, the proper blowing-up can improve dephosphorization effect and reduce the mass percentage of Ti in the molten steel without alloying by a converter (comparative example 1), and the absorption rate of high-carbon ferrochrome is equivalent to that of the method of the application, but the mass percentage of Ti in the molten steel is far higher than that of the molten steel alloyed in the converter, so that the smelting requirement of the low-titanium high-carbon chromium bearing steel is not satisfied.
TABLE 2 influence of total slag quantity in converter on smelting effect
As is clear from table 2, when the total amount of slag in the converter is low, the absorption rate of high carbon ferrochrome is high, but the mass percentage of P in the molten steel is also high; when the total amount of slag in the converter is high, the high-carbon ferrochrome can be influenced to enter molten steel, so that the high-carbon ferrochrome can not be completely melted into the molten steel, and the high-carbon ferrochrome has low absorptivity.
TABLE 3 influence of the mass percent of C in the molten steel before alloying on the smelting effect
As is clear from table 3, if the mass percentage of C in the molten steel is high before alloying, dephosphorization of the molten steel is not facilitated, and if the content of C in the molten steel is low, the content of O in the molten steel is high, and when alloying the molten steel, the alloy material is relatively active, oxidation reaction with O in the molten steel is performed first, and then alloying with the molten steel is performed, which affects the absorption rate of the alloy element by the molten steel.
TABLE 4 influence of oxygen supply Strength and blowing time on smelting Effect during blowing
As is clear from Table 4, a large oxygen supply strength will cause a large amount of alloyed chromium to react with blown oxygen, thereby reducing the absorption rate of high-carbon ferrochrome and increasing the production cost, and the oxygen supply strength and the time of the supplementary blowing are greatly reduced, so that the P element in the steel can be further removed or the temperature of the molten steel can be slightly raised, and the molten steel can meet the tapping condition.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (4)
1. The alloying smelting method in the converter is characterized by comprising the following steps of:
step one: adding molten iron and scrap steel into a converter, wherein the mass ratio of the added scrap steel is below 20%; in molten iron: si is less than 0.35 percent by mass, P is less than 0.08 percent by mass, and Ti is less than 0.06 percent by mass;
step two: oxygen blowing smelting is carried out in the converter, and argon is blown at the bottom of the converter at the same time; controlling the total slag quantity in the converter to be 20-35 kg/t and the slag alkalinity to be 3-4.5; when oxygen blowing smelting is carried out, the oxygen supply strength is 1.5-3.0 Nm 3 /(t.min), oxygen pressure is 0.70-0.90 mpa; when argon is blown from bottom, the flow rate of the argon is 0.03-0.20 Nm 3 /（t·min）；
Step three: stopping blowing oxygen when the mass percentage of C in the molten steel is 0.08-0.20% and the temperature of the molten steel is 1560-1600 ℃; after stopping blowing oxygen, adding high-carbon ferrochrome from a top bin of the converter, lifting argon flow to perform bottom blowing stirring, and implementing molten steel alloying in the converter; wherein the argon flow is raised to 0.20-0.35 Nm 3 The bottom blowing stirring time is 30-60 s;
step four: detecting molten steel, and tapping after the molten steel meets smelting requirements to obtain primary molten steel of the low-titanium high-carbon chromium bearing steel; when the mass percentage of P in the molten steel meets the requirement, the mass percentage of C in the molten steel is 0.06-0.20%, and the temperature of the molten steel is 1540-1590 ℃, the smelting requirement is met.
2. The method according to claim 1, wherein in the second step, a slag former is added into the converter to form slag in the converter.
3. The method for alloying smelting in a converter according to claim 1, wherein in the fourth step, if the molten steel does not meet the smelting requirement, oxygen is again introduced to perform supplementary blowing until the molten steel meets the smelting requirement.
4. A converter furnace alloying according to claim 3The smelting method is characterized in that the supplementary blowing is specifically to carry out supplementary blowing oxygen smelting in the converter and supplementary blowing argon at the bottom of the converter, wherein: the oxygen supply strength of the supplementary blowing is 0.8-1.5 Nm 3 And (t.min), the flow rate of the argon is 0.20-0.35 Nm 3 And (t.min), wherein the blowing time is below 30s.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE973707C (en) * | 1949-06-05 | 1960-05-12 | Phoenix Rheinrohr Ag Vereinigt | Process for producing alloyed steels |
| CN107034421A (en) * | 2017-04-01 | 2017-08-11 | 江苏省沙钢钢铁研究院有限公司 | Highly corrosion resistant high tensile reinforcement and its converter manufacture method |
| CN107130078A (en) * | 2016-02-29 | 2017-09-05 | 鞍钢股份有限公司 | Alloying produces the smelting process of low-phosphorous high-alloy steel in a kind of Converter |
| CN108660278A (en) * | 2017-03-27 | 2018-10-16 | 宝山钢铁股份有限公司 | A kind of converter smelting method of low-phosphorous low-oxygen steel |
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2022
- 2022-06-30 CN CN202210771759.4A patent/CN114959163B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE973707C (en) * | 1949-06-05 | 1960-05-12 | Phoenix Rheinrohr Ag Vereinigt | Process for producing alloyed steels |
| CN107130078A (en) * | 2016-02-29 | 2017-09-05 | 鞍钢股份有限公司 | Alloying produces the smelting process of low-phosphorous high-alloy steel in a kind of Converter |
| CN108660278A (en) * | 2017-03-27 | 2018-10-16 | 宝山钢铁股份有限公司 | A kind of converter smelting method of low-phosphorous low-oxygen steel |
| CN107034421A (en) * | 2017-04-01 | 2017-08-11 | 江苏省沙钢钢铁研究院有限公司 | Highly corrosion resistant high tensile reinforcement and its converter manufacture method |
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