CN110982979A - Production method of ultra-low carbon steel for iron-based alloy - Google Patents
Production method of ultra-low carbon steel for iron-based alloy Download PDFInfo
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
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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
- C21C7/0645—Agents used for dephosphorising or desulfurising
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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
- C21C7/068—Decarburising
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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
- C21C7/10—Handling in a vacuum
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Abstract
The invention discloses a production method of ultra-low carbon steel for iron-based alloy, which comprises the following steps: s1, KR molten iron desulphurization pretreatment; s2, smelting in a top-bottom combined blown converter; s3, refining in an LF furnace; s4, carrying out RH vacuum refining deep decarburization, deep denitrification and deep dehydrogenation treatment; s5, carrying out full-protection casting by using a slab caster; firstly, KR molten iron desulphurization pretreatment, then top-bottom combined blown converter smelting, LF furnace refining treatment, RH vacuum refining deep decarburization, deep denitrification and deep dehydrogenation treatment, and finally slab caster full-protection casting are carried out, so that the produced ultra-low carbon steel for the iron-based alloy has high purity and low carbon content, and can meet the technical index requirements of iron-based alloy production.
Description
Technical Field
The invention belongs to the technical field of smelting and preparing ultra-low carbon steel for iron-based alloy, and particularly relates to a production and manufacturing method of ultra-low carbon steel for iron-based alloy.
Background
Iron-based alloys are an important class of functional materials used in the electrical, electronic and military industries. In the power industry, iron-based alloy special materials play an important role in capacity conversion in the whole process of generating, transmitting and utilizing electric energy. The emphasis on improving the special properties of iron-based alloys is on the control of the elements silicon and aluminum. The preparation of the iron-based alloy needs ultra-low carbon steel with ultra-purity as a base material, and simultaneously, the ranges of silicon and aluminum elements in ultra-low carbon steel products need to be reasonably controlled, so that YTO series industrial pure iron products produced according to the national standard can not meet the technical index requirements of the iron-based alloy production, and therefore, the production and manufacturing method of the ultra-low carbon steel for the iron-based alloy is provided.
Disclosure of Invention
The present invention is to provide a method for producing an ultra-low carbon steel for iron-based alloys, which solves the problems of the background art.
In order to achieve the purpose, the invention adopts the following technical scheme: a production method of ultra-low carbon steel for iron-based alloy comprises the following steps:
s1, KR molten iron desulphurization pretreatment;
s2, smelting in a top-bottom combined blown converter;
s3, refining in an LF furnace;
s4, carrying out RH vacuum refining deep decarburization, deep denitrification and deep dehydrogenation treatment;
and S5, carrying out full-protection casting by using a slab caster.
The present invention is further preferred: in S1, during KR molten iron desulphurization pretreatment, a composite desulfurizer composed of calcium oxide, calcium fluoride and silicon dioxide is used for deep desulphurization treatment.
The present invention is further preferred: the composite desulfurizer comprises the following components in percentage by weight: calcium oxide is more than or equal to 75 percent, calcium fluoride is 5-10 percent, silicon dioxide is less than or equal to 10 percent, burning loss is less than or equal to 6 percent, and the sulfur content in the molten iron after KR molten iron desulphurization is less than or equal to 0.0015 percent by weight.
The present invention is further preferred: in S2, when smelting in a top-bottom combined blown converter, a double-slag smelting process is adopted, simultaneously bottom blowing process control is carried out, high-aluminum content slag making materials are added, and ladle top slag modification treatment is carried out.
The present invention is further preferred: when the bottom blowing process is controlled, the end point temperature is 1650-1750 ℃, the end point carbon content is 0.02-0.04 wt%, the end point silicon content is less than or equal to 0.10 wt%, the end point manganese content is less than or equal to 0.08 wt%, the end point phosphorus content is less than or equal to 0.008 wt%, and the end point sulfur content is less than or equal to 0.005 wt%.
The present invention is further preferred: in S3, during LF furnace refining, 2-6kg of lime per ton of steel, 1-5kg of bauxite per ton of steel and 2-8kg of high-calcium aluminum slag balls per ton of steel are added for slag deoxidation, the oxygen activity is less than or equal to 600ppm after LF refining is finished, the refining period is controlled according to 20-35min, and the LF refining finishing temperature is 1600-.
The present invention is further preferred: in S4, when RH vacuum refining is carried out for deep decarburization, deep denitrification and deep dehydrogenation, aluminum particles are added for deoxidation and aluminum adjustment, and low-carbon silicon iron is added for silicon adjustment, wherein the silicon content is 75-85%, the granularity is 10-50mm, and the addition amount of each ton of steel is 4-16 kg; controlling the carbon content to be less than or equal to 0.003 wt%, the end point silicon content to be 0.05-1 wt%, the end point manganese content to be less than or equal to 0.1 wt%, the end point phosphorus content to be less than or equal to 0.008 wt% and the end point sulfur content to be less than or equal to 0.005 wt% when RH is finished; the total oxygen content at the end of RH is less than or equal to 0.0050 wt%, the nitrogen content at the end of RH is less than or equal to 0.003 wt%, the hydrogen content at the end of RH is less than or equal to 0.0001 wt%, and the aluminum content at the end of RH is 0.010-0.2 wt%.
The present invention is further preferred: in S5, when the slab caster is used for full-protection casting, the liquid level of the crystallizer is automatically controlled, and the special crystallizer covering slag for ultra-pure iron and high-aluminum steel is used.
The present invention is further preferred: the temperature of the middle ladle is controlled at 1550-.
The invention has the technical effects and advantages that: compared with the prior art, the production and manufacturing method of the ultra-low carbon steel for the iron-based alloy has the following advantages:
firstly, KR molten iron desulphurization pretreatment, then top-bottom combined blown converter smelting, LF furnace refining treatment, RH vacuum refining deep decarburization, deep denitrification and deep dehydrogenation treatment, and finally slab caster full-protection casting are carried out, so that the produced ultra-low carbon steel for the iron-based alloy has high purity and low carbon content, and can meet the technical index requirements of iron-based alloy production.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. 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.
Example one
The invention provides a production method of ultra-low carbon steel for iron-based alloy as shown in figure 1, which comprises the following steps:
s1, KR molten iron desulphurization pretreatment;
s2, smelting in a top-bottom combined blown converter;
s3, refining in an LF furnace;
s4, carrying out RH vacuum refining deep decarburization, deep denitrification and deep dehydrogenation treatment;
and S5, carrying out full-protection casting by using a slab caster.
The invention specifically comprises the following steps: in S1, during KR molten iron desulphurization pretreatment, a composite desulfurizer composed of calcium oxide, calcium fluoride and silicon dioxide is used for deep desulphurization treatment.
The invention specifically comprises the following steps: the composite desulfurizer comprises the following components in percentage by weight: 75% of calcium oxide, 10% of calcium fluoride, 10% of silicon dioxide, 4.9985% of burning loss, and 0.0015% of sulfur in the molten iron after KR molten iron desulphurization treatment.
By adopting the scheme, the aims of high utilization rate of the desulfurizer and quick and efficient desulfurization can be fulfilled.
The invention specifically comprises the following steps: in S2, when smelting in a top-bottom combined blown converter, a double-slag smelting process is adopted, simultaneously bottom blowing process control is carried out, high-aluminum content slag making materials are added, and ladle top slag modification treatment is carried out.
The invention specifically comprises the following steps: when the bottom blowing process is controlled, the end point temperature is 1650 ℃, the end point carbon content is 0.02 wt%, the end point silicon content is 0.01 wt%, the end point manganese content is 0.01 wt%, the end point phosphorus content is 0.001 wt%, and the end point sulfur content is 0.001 wt%.
By adopting the scheme, the process for smelting the top-bottom combined blown converter can be determined
The invention specifically comprises the following steps: in S3, during LF furnace refining, lime 2 kg/ton steel and bauxite 1 kg/ton steel are added, high calcium aluminum slag ball 2 kg/ton steel is added for slag deoxidation, the oxygen activity is 300ppm at the end of LF refining, the refining period is controlled according to 20min, and the temperature at the end of LF refining is 1600 ℃.
By adopting the scheme, the refining treatment process of the LF furnace can be determined
The invention specifically comprises the following steps: in S4, when RH vacuum refining is carried out for deep decarburization, deep denitrification and deep dehydrogenation, aluminum particles are added for deoxidation and aluminum adjustment, and low-carbon ferrosilicon is added for silicon adjustment, wherein the silicon content is 75%, the granularity is 10mm, and the addition amount per ton of steel is 4 kg; controlling the carbon content to be 0.001 wt%, the end point silicon content to be 0.05 wt%, the end point manganese content to be 0.01 wt%, the end point phosphorus content to be 0.001 wt% and the end point sulfur content to be 0.001 wt% at the end of RH; total oxygen content 0.001 wt% at end of RH, nitrogen content 0.001 wt% at end of RH, hydrogen content 0.00001 wt% at end of RH, and aluminum content 0.01 wt% at end of RH.
By adopting the scheme, the process for carrying out deep decarburization, deep denitrification and deep dehydrogenation treatment on RH vacuum refining can be determined
The invention specifically comprises the following steps: in S5, when the slab caster is used for full-protection casting, the liquid level of the crystallizer is automatically controlled, and the special crystallizer covering slag for ultra-pure iron and high-aluminum steel is used.
The invention specifically comprises the following steps: the temperature of the middle ladle is controlled at 1550 ℃, the large ladle uses an integral nozzle, the middle ladle uses a full-protection pouring submerged nozzle, and the carbon-free steel ladle and the special high-alkalinity middle ladle covering agent for the ultra-pure iron steel are used.
By adopting the scheme, the full-protection casting process of the slab caster can be determined.
The working principle is as follows: firstly, KR molten iron desulphurization pretreatment, then top-bottom combined blown converter smelting, next LF furnace refining treatment, then RH vacuum refining deep decarburization, deep denitrification and deep dehydrogenation treatment, and finally slab caster full-protection casting is carried out, so that the produced ultra-low carbon steel for the iron-based alloy has high purity and low carbon content.
Example two
The present invention also provides a method for manufacturing an ultra low carbon steel for iron-based alloys as shown in fig. 1, which comprises the following steps, in contrast to the first embodiment:
KR molten iron desulphurization pretreatment: the composite desulfurizer comprises the following components in percentage by weight: 85% of calcium oxide, 5% of calcium fluoride, 5% of silicon dioxide, 4.999% of burning loss, and 0.001% of sulfur in the molten iron after KR molten iron desulphurization treatment;
when the bottom blowing process is controlled: the end point temperature is 1700 ℃, the end point carbon content is 0.03 wt%, the end point silicon content is 0.05 wt%, the end point manganese content is 0.04 wt%, the end point phosphorus content is 0.004 wt%, and the end point sulfur content is 0.0025 wt%;
refining treatment in an LF furnace: adding lime 4 kg/ton steel, bauxite 4 kg/ton steel, adding high calcium aluminum slag ball 2.5 kg/ton steel for slag deoxidation, controlling the oxygen activity 450ppm at the end of LF refining, the refining period at 28min, and the temperature 1625 ℃ at the end of LF refining;
RH vacuum refining deep decarburization, deep denitrification and deep dehydrogenation treatment: adding aluminum particles for deoxidation and aluminum adjustment, adding low-carbon silicon iron for silicon adjustment, wherein the silicon content is 80%, the granularity is 30mm, and the addition amount of each ton of steel is 10 kg; controlling the carbon content to be 0.0015 wt%, the end point silicon content to be 0.5 wt%, the end point manganese content to be 0.05 wt%, the end point phosphorus content to be 0.004 wt% and the end point sulfur content to be 0.0025 wt% when RH is finished; total oxygen content at the end of RH 0.0025 t%, nitrogen content at the end of RH 0.0015 wt%, hydrogen content at the end of RH 0.00005 wt%, aluminum content at the end of RH 0.11 wt%;
and (3) full-protection casting of a slab caster: the temperature of the tundish is controlled at 1560 ℃.
EXAMPLE III
The present invention also provides a method for manufacturing an ultra low carbon steel for iron-based alloys as shown in fig. 1, which comprises the following steps, in contrast to the first embodiment:
KR molten iron desulphurization pretreatment: the composite desulfurizer comprises the following components in percentage by weight: 90% of calcium oxide, 5% of calcium fluoride, 2% of silicon dioxide, 4.9985% of burning loss, and 0.0015% of sulfur in the molten iron after KR molten iron desulphurization treatment;
when the bottom blowing process is controlled: the end point temperature is 1750 ℃, the end point carbon content is 0.04 wt%, the end point silicon content is 0.1 wt%, the end point manganese content is 0.08 wt%, the end point phosphorus content is 0.008 wt%, and the end point sulfur content is 0.005 wt%;
refining treatment in an LF furnace: adding 6kg of lime per ton of steel, 5kg of bauxite per ton of steel, adding 8kg of high-calcium aluminum slag balls per ton of steel for slag deoxidation, controlling the oxygen activity to be 600ppm after LF refining is finished, controlling the refining period to be 35min, and controlling the temperature to be 1650 ℃ after LF refining is finished;
RH vacuum refining deep decarburization, deep denitrification and deep dehydrogenation treatment: adding aluminum particles for deoxidation and aluminum adjustment, adding low-carbon silicon iron for silicon adjustment, wherein the silicon content is 85%, the granularity is 50mm, and the addition amount of each ton of steel is 16 kg; controlling the carbon content to be 0.003 wt% at the end of RH, the end point silicon content to be 1 wt%, the end point manganese content to be 0.1 wt%, the end point phosphorus content to be 0.008 wt% and the end point sulfur content to be 0.005 wt%; total oxygen content 0.005 wt% at end of RH, nitrogen content 0.003 wt% at end of RH, hydrogen content 0.0001 wt% at end of RH, and aluminum content 0.2 wt% at end of RH;
and (3) full-protection casting of a slab caster: the temperature of the tundish is controlled at 1570 ℃.
In addition, the invention provides a comparison table of implementation effects of the first embodiment, the second embodiment and the third embodiment, as shown in table 1:
TABLE 1 ultra-low carbon steel purity and main component index for iron-based alloy
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The production method of the ultra-low carbon steel for the iron-based alloy is characterized by comprising the following steps of:
s1, KR molten iron desulphurization pretreatment;
s2, smelting in a top-bottom combined blown converter;
s3, refining in an LF furnace;
s4, carrying out RH vacuum refining deep decarburization, deep denitrification and deep dehydrogenation treatment;
and S5, carrying out full-protection casting by using a slab caster.
2. The manufacturing method of an ultra low carbon steel for iron-based alloys according to claim 1, wherein: in S1, during KR molten iron desulphurization pretreatment, a composite desulfurizer composed of calcium oxide, calcium fluoride and silicon dioxide is used for deep desulphurization treatment.
3. The manufacturing method of an ultra low carbon steel for iron-based alloys according to claim 2, wherein: the composite desulfurizer comprises the following components in percentage by weight: calcium oxide is more than or equal to 75 percent, calcium fluoride is 5-10 percent, silicon dioxide is less than or equal to 10 percent, burning loss is less than or equal to 6 percent, and the sulfur content in the molten iron after KR molten iron desulphurization is less than or equal to 0.0015 percent by weight.
4. The manufacturing method of an ultra low carbon steel for iron-based alloys according to claim 1, wherein: in S2, when smelting in a top-bottom combined blown converter, a double-slag smelting process is adopted, simultaneously bottom blowing process control is carried out, high-aluminum content slag making materials are added, and ladle top slag modification treatment is carried out.
5. The manufacturing method of an ultra low carbon steel for iron-based alloys according to claim 4, wherein: when the bottom blowing process is controlled, the end point temperature is 1650-1750 ℃, the end point carbon content is 0.02-0.04 wt%, the end point silicon content is less than or equal to 0.10 wt%, the end point manganese content is less than or equal to 0.08 wt%, the end point phosphorus content is less than or equal to 0.008 wt%, and the end point sulfur content is less than or equal to 0.005 wt%.
6. The manufacturing method of an ultra low carbon steel for iron-based alloys according to claim 1, wherein: in S3, during LF furnace refining, 2-6kg of lime per ton of steel, 1-5kg of bauxite per ton of steel and 2-8kg of high-calcium aluminum slag balls per ton of steel are added for slag deoxidation, the oxygen activity is less than or equal to 600ppm after LF refining is finished, the refining period is controlled according to 20-35min, and the LF refining finishing temperature is 1600-.
7. The manufacturing method of an ultra low carbon steel for iron-based alloys according to claim 1, wherein: in S4, when RH vacuum refining is carried out for deep decarburization, deep denitrification and deep dehydrogenation, aluminum particles are added for deoxidation and aluminum adjustment, and low-carbon silicon iron is added for silicon adjustment, wherein the silicon content is 75-85%, the granularity is 10-50mm, and the addition amount of each ton of steel is 4-16 kg; controlling the carbon content to be less than or equal to 0.003 wt%, the end point silicon content to be 0.05-1 wt%, the end point manganese content to be less than or equal to 0.1 wt%, the end point phosphorus content to be less than or equal to 0.008 wt% and the end point sulfur content to be less than or equal to 0.005 wt% when RH is finished; the total oxygen content at the end of RH is less than or equal to 0.0050 wt%, the nitrogen content at the end of RH is less than or equal to 0.003 wt%, the hydrogen content at the end of RH is less than or equal to 0.0001 wt%, and the aluminum content at the end of RH is 0.010-0.2 wt%.
8. The manufacturing method of an ultra low carbon steel for iron-based alloys according to claim 1, wherein: in S5, when the slab caster is used for full-protection casting, the liquid level of the crystallizer is automatically controlled, and the special crystallizer covering slag for ultra-pure iron and high-aluminum steel is used.
9. The manufacturing method of an ultra low carbon steel for iron-based alloys according to claim 1, wherein: the temperature of the middle ladle is controlled at 1550-.
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| CN115305314A (en) * | 2022-08-18 | 2022-11-08 | 日照钢铁控股集团有限公司 | LF-RH duplex ultra-low carbon steel production method for thin slab continuous casting and rolling production line |
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Application publication date: 20200410 |