CN111440999A - Production method for improving micro segregation of acid-resistant pipeline - Google Patents
Production method for improving micro segregation of acid-resistant pipeline Download PDFInfo
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- B22—CASTING; POWDER METALLURGY
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- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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- 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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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- 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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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
Abstract
The invention discloses a production method for improving acid-resistant pipeline microsegregation, which relates to the technical field of steel smelting, and comprises the following chemical components in percentage by mass: c: 0.010% -0.030%, Si: 0.10-0.30%, Mn: 0.80 to 1.40 percent of Ni, less than or equal to 0.015 percent of P, less than or equal to 0.0010 percent of S, 0.10 to 0.30 percent of Ni, 0.10 to 0.30 percent of Cu, less than or equal to 0.30 percent of Cr, less than or equal to 0.15 percent of Mo, and Nb: 0.02-0.07%, V0.010-0.050%, Ti: 0.010-0.020%, Ca: 0.0005% -0.0040%, Al: 0.010% -0.050%, and the secondary cooling water model process is optimized, an electromagnetic stirring technology is not used, the micro segregation of the casting blank is improved by adopting large reduction, and the acid and corrosion resistance requirements of the HIC and SSC of the pipeline steel are improved.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a production method for improving acid-resistant pipeline microsegregation.
Background
Due to over saturation of the steel market, the enterprise competitiveness tends to be more whitish, the gross profit of the conventional variety is lower and lower, and the development of high-grade products becomes the key for the survival and development of the enterprise. The demand of pipeline steel products on the international market is quite large, the acid-resistant pipeline has high production difficulty and strict product quality requirement, few enterprises have supply quality, and the acid-resistant pipeline production process is usually caused by serious segregation at the core of a casting blank and accumulation of carbide at the core to form a conductor, so that the electrode inside the structure is poor, hydrogen-induced cracks are formed, and the acid-resistant and corrosion-resistant performance of the product is reduced.
Disclosure of Invention
In order to solve the technical problems, the invention provides a production method for improving the micro segregation of an acid-resistant pipeline, which comprises the following chemical components in percentage by mass: c: 0.010% -0.030%, Si: 0.10-0.30%, Mn: 0.80 to 1.40 percent of Ni, less than or equal to 0.015 percent of P, less than or equal to 0.0010 percent of S, 0.10 to 0.30 percent of Ni, 0.10 to 0.30 percent of Cu, less than or equal to 0.30 percent of Cr, less than or equal to 0.15 percent of Mo, and Nb: 0.02-0.07%, V0.010-0.050%, Ti: 0.010-0.020%, Ca: 0.0005% -0.0040%, Al: 0.010-0.050%, and the balance of Fe and inevitable impurities;
the method specifically comprises the following steps:
s1, carrying out composite desulfurization treatment on molten iron through CaO and Mg, and completely slagging off the desulfurized molten iron to ensure that S in the molten iron fed into the furnace is less than or equal to 0.002%;
s2, adopting a top-bottom combined blowing mode by the converter, enabling the blowing end temperature to be more than or equal to 1680 ℃, and adopting oxygen-retaining operation for tapping;
s3, hoisting the molten steel to an RH furnace for vacuum treatment after tapping of the converter is finished, carrying out decarburization treatment under the condition that the vacuum degree is less than or equal to 3.0mbar, carrying out microalloying after decarburization is finished, and keeping vacuum for 15min after alloying is finished;
s4, carrying out desulfurization treatment and alloying operation in a L F furnace after the vacuum treatment is finished, and carrying out calcium treatment operation when S is less than or equal to 0.0010% and the alloy meets the specified requirements, wherein the calcium treatment uses a seamless pure calcium wire, the furnace is 180 m/furnace at the head, and the other furnaces are 150 m/furnace;
s5, adjusting a secondary cooling effect in the continuous casting process, cooling by adopting a strong cooling mode, ensuring that dynamic soft reduction is performed before 6 sections, simultaneously increasing the dynamic soft reduction, ensuring that the dynamic soft reduction reaches 8-10 mm, strictly forbidding use of electromagnetic stirring in the casting process, and controlling the compression ratio to be more than 7 times of the plate thickness in the rolling process.
The technical effects are as follows: according to the current production situation of the acid-resistant pipeline, the invention ensures that the casting blank is subjected to dynamic soft reduction at 6 sections of advancing action by virtue of the process design of continuous casting secondary cooling and pulling speed matching, the effect of increasing the dynamic soft reduction under high pressure is increased at the moment, the low-power quality of the core part of the casting blank is ensured, developed columnar crystals are obtained under the secondary cooling effect without using an electromagnetic stirring technology, the force transmission in the rolling process is increased, the deformation of the core part tissue of a rolled plate is facilitated, a steel plate with better uniformity of the microstructure of the core part after rolling is obtained, and the acid-resistant and corrosion-resistant performance of the steel plate is better.
The technical scheme of the invention is further defined as follows:
the production method for improving the micro segregation of the acid-resistant pipeline comprises the following chemical components in percentage by mass: c: 0.010% -0.020%, Si: 0.10-0.20%, Mn: 0.80-1.00 percent of Ni, less than or equal to 0.015 percent of P, less than or equal to 0.0010 percent of S, 0.10-0.20 percent of Ni, 0.10-0.20 percent of Cu, less than or equal to 0.30 percent of Cr, less than or equal to 0.15 percent of Mo, and Nb: 0.02-0.04%, V0.010-0.020%, Ti: 0.010-0.020%, Ca: 0.0005% -0.0040%, Al: 0.010-0.050%, and the balance of Fe and inevitable impurities.
The production method for improving the micro segregation of the acid-resistant pipeline comprises the following chemical components in percentage by mass: c: 0.020% -0.030%, Si: 0.20-0.30%, Mn: 1.00-1.20 percent of Ni, less than or equal to 0.015 percent of P, less than or equal to 0.0010 percent of S, 0.20-0.30 percent of Ni, 0.20-0.30 percent of Cu, less than or equal to 0.30 percent of Cr, less than or equal to 0.15 percent of Mo, and Nb: 0.04-0.06%, V0.030-0.050%, Ti: 0.010-0.020%, Ca: 0.0005% -0.0040%, Al: 0.010-0.050%, and the balance of Fe and inevitable impurities.
The production method for improving the micro segregation of the acid-resistant pipeline comprises the following chemical components in percentage by mass: c: 0.010% -0.020%, Si: 0.10-0.20%, Mn: 1.20 to 1.40 percent of Ni, less than or equal to 0.013 percent of P, less than or equal to 0.0010 percent of S, 0.20 to 0.30 percent of Ni, 0.20 to 0.30 percent of Cu, Cr: 0.20% -0.30%, Mo: 0.08-0.13%, Nb: 0.06-0.07%, V0.020-0.030%, Ti: 0.010-0.020%, Ca: 0.0005% -0.0040%, Al: 0.010-0.050%, and the balance of Fe and inevitable impurities.
The production method for improving the micro segregation of the acid-resistant pipeline comprises the following chemical components in percentage by mass: c: 0.016%, Si: 0.18%, Mn: 0.88 percent, less than or equal to 0.011 percent of P, less than or equal to 0.0006 percent of S, 0.19 percent of Ni, 0.16 percent of Cu, Cr: 0.0230%, Mo: 0.03%, Nb: 0.036%, V:0.018%, Ti: 0.016%, Ca: 0.0016%, Al: 0.0350%, the balance being Fe and unavoidable impurities;
the method specifically comprises the following steps:
s1, carrying out composite desulfurization treatment on the molten iron through CaO and Mg, and deslagging the desulfurized molten iron to be clean so as to ensure that the molten iron S entering the furnace is: 0.002%;
s2, adopting a top-bottom combined blowing mode by the converter, keeping the blowing end temperature at 1689 ℃, and adopting oxygen-retaining operation for tapping;
s3, hoisting the molten steel to an RH furnace for vacuum treatment after tapping of the converter is finished, carrying out decarburization treatment under the condition that the vacuum degree is 2.0mbar, carrying out microalloying after decarburization is finished, and keeping vacuum for 15min after alloying is finished;
s4, carrying out desulfurization treatment and alloying operation in a L F furnace after the vacuum treatment is finished, and carrying out calcium treatment operation when the S is 0.00080% and the alloy meets the specified requirements, wherein the calcium treatment uses a seamless pure calcium wire, the furnace is 180 m/furnace at the head, and the other furnaces are 150 m/furnace;
s5, adjusting a secondary cooling effect in the continuous casting process, cooling by adopting a strong cooling mode, ensuring that dynamic soft reduction is performed before 6 sections, simultaneously increasing the dynamic soft reduction, ensuring that the dynamic soft reduction reaches 9mm, strictly forbidding use of electromagnetic stirring in the casting process, and controlling the compression ratio to be more than 7 times of the plate thickness in the rolling process.
The production method for improving the micro segregation of the acid-resistant pipeline comprises the following chemical components in percentage by mass: 0.023%, Si: 0.23%, Mn: 1.15 percent, less than or equal to 0.010 percent of P, less than or equal to 0.0008 percent of S, 0.23 percent of Ni, 0.24 percent of Cu, and the weight percentage of Cr: 0.0330%, mo.02%, Nb: 0.045%, V:0.033%, Ti: 0.017%, Ca: 0.0018%, Al: 0.033% and the balance Fe and inevitable impurities;
the method specifically comprises the following steps:
s1, carrying out composite desulfurization treatment on the molten iron through CaO and Mg, and deslagging the desulfurized molten iron to be clean so as to ensure that the molten iron S entering the furnace is: 0.002%;
s2, adopting a top-bottom combined blowing mode by the converter, keeping the blowing end temperature at 1693 ℃, and adopting oxygen-retaining operation for tapping;
s3, hoisting the molten steel to an RH furnace for vacuum treatment after tapping of the converter is finished, carrying out decarburization treatment under the condition that the vacuum degree is 3.0mbar, carrying out microalloying after decarburization is finished, and keeping vacuum for 15min after alloying is finished;
s4, carrying out desulfurization treatment and alloying operation in a L F furnace after the vacuum treatment is finished, and carrying out calcium treatment operation when the S is 0.00070% and the alloy meets the specified requirements, wherein the calcium treatment uses a seamless pure calcium wire, the furnace is 180 m/furnace at the head, and the other furnaces are 150 m/furnace;
s5, adjusting a secondary cooling effect in the continuous casting process, cooling by adopting a strong cooling mode, ensuring that dynamic soft reduction is performed before 6 sections, simultaneously increasing the dynamic soft reduction, ensuring that the dynamic soft reduction reaches 10mm, strictly forbidding use of electromagnetic stirring in the casting process, and controlling the compression ratio to be more than 7 times of the plate thickness in the rolling process.
The production method for improving the micro segregation of the acid-resistant pipeline comprises the following chemical components in percentage by mass: c: 0.013%, Si: 0.19%, Mn: 1.39 percent, less than or equal to 0.010 percent of P, less than or equal to 0.0007 percent of S, 0.26 percent of Ni, 0.23 percent of Cu, Cr: 0.27%, Mo: 0.11%, Nb: 0.065%, V:0.023%, Ti: 0.018%, Ca: 0.0015%, Al: 0.038%, the balance being Fe and unavoidable impurities;
the method specifically comprises the following steps:
s1, carrying out composite desulfurization treatment on the molten iron through CaO and Mg, and deslagging the desulfurized molten iron to be clean so as to ensure that the molten iron S entering the furnace is: 0.002%;
s2, adopting a top-bottom combined blowing mode by the converter, keeping the blowing end temperature at 1683 ℃, and adopting oxygen-retaining operation for tapping;
s3, hoisting the molten steel to an RH furnace for vacuum treatment after tapping of the converter is finished, carrying out decarburization treatment under the condition that the vacuum degree is 1.0mbar, carrying out microalloying after decarburization is finished, and keeping vacuum for 15min after alloying is finished;
s4, carrying out desulfurization treatment and alloying operation in a L F furnace after the vacuum treatment is finished, and carrying out calcium treatment operation when the S is 0.00090% and the alloy meets the specified requirements, wherein the calcium treatment uses a seamless pure calcium wire, the furnace is 180 m/furnace at the head, and the other furnaces are 150 m/furnace;
s5, adjusting a secondary cooling effect in the continuous casting process, cooling by adopting a strong cooling mode, ensuring that dynamic soft reduction is performed before 6 sections, simultaneously increasing the dynamic soft reduction, ensuring that the dynamic soft reduction reaches 10mm, strictly forbidding use of electromagnetic stirring in the casting process, and controlling the compression ratio to be more than 7 times of the plate thickness in the rolling process.
The invention has the beneficial effects that:
(1) the invention stabilizes the smelting components of the product and reduces the content of harmful gases such as P, S, O, N, H by controlling the smelting process, and the vacuum and calcium treatment process improves the purity of the molten steel and the internal quality of the product;
(2) according to the invention, through the matching use of secondary cooling and pulling speed, the structural uncertainty of a straightening area in the casting blank internal solidification process is effectively avoided, the components of the casting blank in the core solidification process are more uniform, the structure formation is more stable, the structure form obtained after the product is rolled is more stable, and the acid and corrosion resistance of the product meets the use requirements of users;
(3) the invention does not adopt an electromagnetic stirring technology, effectively improves the dynamic soft reduction effect by increasing the dynamic soft reduction, forms a developed columnar crystal structure, increases the core deformation capability under the coordination of a large-compression-ratio rolling process, improves the microsegregation index of the core of the rolled steel plate, has more excellent core performance of the steel plate and improves the acid and corrosion resistance of the steel plate.
Drawings
FIG. 1 is a metallographic structure diagram showing the microsegregation of the core of the product of example 1 in the present invention.
Detailed Description
Example 1
The embodiment provides a production method for improving micro segregation of an acid-resistant pipeline, which comprises the following chemical components in percentage by mass: c: 0.016%, Si: 0.18%, Mn: 0.88 percent, less than or equal to 0.011 percent of P, less than or equal to 0.0006 percent of S, 0.19 percent of Ni, 0.16 percent of Cu, Cr: 0.0230%, Mo: 0.03%, Nb: 0.036%, V:0.018%, Ti: 0.016%, Ca: 0.0016%, Al: 0.0350%, the balance being Fe and unavoidable impurities.
The specific production comprises the following steps:
s1, carrying out composite desulfurization treatment on the molten iron through CaO and Mg, and deslagging the desulfurized molten iron to be clean so as to ensure that the molten iron S entering the furnace is: 0.002%;
s2, adopting a top-bottom combined blowing mode by the converter, keeping the blowing end temperature at 1689 ℃, and adopting oxygen-retaining operation for tapping;
s3, hoisting the molten steel to an RH furnace for vacuum treatment after tapping of the converter is finished, carrying out decarburization treatment under the condition that the vacuum degree is 2.0mbar, carrying out microalloying after decarburization is finished, and keeping vacuum for 15min after alloying is finished so as to improve the purity of the molten steel;
s4, carrying out desulfurization treatment and alloying operation in a L F furnace after the vacuum treatment is finished, and carrying out calcium treatment operation when the S is 0.00080% and the alloy meets the specified requirements, wherein the calcium treatment uses a seamless pure calcium wire, the furnace is 180 m/furnace at the head, and the other furnaces are 150 m/furnace;
s5, adjusting a secondary cooling effect in the continuous casting process, cooling by adopting a strong cooling mode, ensuring that dynamic soft reduction is performed before 6 sections, simultaneously increasing the dynamic soft reduction, ensuring that the dynamic soft reduction reaches 9mm, improving the dynamic soft reduction effect, strictly forbidding electromagnetic stirring in the casting process, forming a developed columnar crystal structure, controlling the compression ratio to be more than 7 times of the plate thickness in the rolling process, rolling to improve the core quality of a casting blank, and improving the acid and corrosion resistance of a steel plate.
Example 2
The embodiment provides a production method for improving micro segregation of an acid-resistant pipeline, which comprises the following chemical components in percentage by mass: 0.023%, Si: 0.23%, Mn: 1.15 percent, less than or equal to 0.010 percent of P, less than or equal to 0.0008 percent of S, 0.23 percent of Ni, 0.24 percent of Cu, and the weight percentage of Cr: 0.0330%, mo.02%, Nb: 0.045%, V:0.033%, Ti: 0.017%, Ca: 0.0018%, Al: 0.033% and the balance Fe and inevitable impurities.
The specific production comprises the following steps:
s1, carrying out composite desulfurization treatment on the molten iron through CaO and Mg, and deslagging the desulfurized molten iron to be clean so as to ensure that the molten iron S entering the furnace is: 0.002%;
s2, adopting a top-bottom combined blowing mode by the converter, keeping the blowing end temperature at 1693 ℃, and adopting oxygen-retaining operation for tapping;
s3, hoisting the molten steel to an RH furnace for vacuum treatment after tapping of the converter is finished, carrying out decarburization treatment under the condition that the vacuum degree is 3.0mbar, carrying out microalloying after decarburization is finished, and keeping vacuum for 15min after alloying is finished so as to improve the purity of the molten steel;
s4, carrying out desulfurization treatment and alloying operation in a L F furnace after the vacuum treatment is finished, and carrying out calcium treatment operation when the S is 0.00070% and the alloy meets the specified requirements, wherein the calcium treatment uses a seamless pure calcium wire, the furnace is 180 m/furnace at the head, and the other furnaces are 150 m/furnace;
s5, adjusting a secondary cooling effect in the continuous casting process, cooling by adopting a strong cooling mode, ensuring that dynamic soft reduction is performed before 6 sections, simultaneously increasing the dynamic soft reduction, ensuring that the dynamic soft reduction reaches 10mm, improving the dynamic soft reduction effect, strictly forbidding electromagnetic stirring in the casting process, forming a developed columnar crystal structure, controlling the compression ratio to be more than 7 times of the plate thickness in the rolling process, rolling to improve the core quality of a casting blank, and improving the acid and corrosion resistance of a steel plate.
Example 3
The embodiment provides a production method for improving micro segregation of an acid-resistant pipeline, which comprises the following chemical components in percentage by mass: the chemical components and the mass percentage are as follows: c: 0.013%, Si: 0.19%, Mn: 1.39 percent, less than or equal to 0.010 percent of P, less than or equal to 0.0007 percent of S, 0.26 percent of Ni, 0.23 percent of Cu, Cr: 0.27%, Mo: 0.11%, Nb: 0.065%, V:0.023%, Ti: 0.018%, Ca: 0.0015%, Al: 0.038%, the balance being Fe and unavoidable impurities.
The specific production comprises the following steps:
s1, carrying out composite desulfurization treatment on the molten iron through CaO and Mg, and deslagging the desulfurized molten iron to be clean so as to ensure that the molten iron S entering the furnace is: 0.002%;
s2, adopting a top-bottom combined blowing mode by the converter, keeping the blowing end temperature at 1683 ℃, and adopting oxygen-retaining operation for tapping;
s3, hoisting the molten steel to an RH furnace for vacuum treatment after tapping of the converter is finished, carrying out decarburization treatment under the condition that the vacuum degree is 1.0mbar, carrying out microalloying after decarburization is finished, and keeping vacuum for 15min after alloying is finished so as to improve the purity of the molten steel;
s4, carrying out desulfurization treatment and alloying operation in a L F furnace after the vacuum treatment is finished, and carrying out calcium treatment operation when the S is 0.0009% and the alloy meets the specified requirements, wherein the calcium treatment uses a seamless pure calcium wire, the furnace is 180 m/furnace at the head, and the other furnaces are 150 m/furnace;
s5, adjusting a secondary cooling effect in the continuous casting process, cooling by adopting a strong cooling mode, ensuring that dynamic soft reduction is performed before 6 sections, simultaneously increasing the dynamic soft reduction, ensuring that the dynamic soft reduction reaches 10mm, improving the dynamic soft reduction effect, strictly forbidding electromagnetic stirring in the casting process, forming a developed columnar crystal structure, controlling the compression ratio to be more than 7 times of the plate thickness in the rolling process, rolling to improve the core quality of a casting blank, and improving the acid and corrosion resistance of a steel plate.
The products obtained in examples 1 to 3 were tested for HIC properties, the results of which are given in the following table:
| examples | Soaking solution | CLR％ | CTR％ | CSR |
| Example 1 | A | 0 | 0 | 0 |
| Example 2 | A | 0 | 0 | 0 |
| Example 3 | A | 0 | 0 | 0 |
Referring to fig. 1, the microstructure of the product is mainly ferrite structure, and contains a small amount of bainite structure, the grain size rating is 10, the acid resistance of the steel plate meets the requirements related to API 5L, the use requirements of users are met, and the design requirements are met.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (7)
1. A production method for improving micro segregation of an acid-resistant pipeline is characterized by comprising the following steps:
the chemical components and the mass percentage are as follows: c: 0.010% -0.030%, Si: 0.10-0.30%, Mn: 0.80 to 1.40 percent of Ni, less than or equal to 0.015 percent of P, less than or equal to 0.0010 percent of S, 0.10 to 0.30 percent of Ni, 0.10 to 0.30 percent of Cu, less than or equal to 0.30 percent of Cr, less than or equal to 0.15 percent of Mo, and Nb: 0.02-0.07%, V0.010-0.050%, Ti: 0.010-0.020%, Ca: 0.0005% -0.0040%, Al: 0.010-0.050%, and the balance of Fe and inevitable impurities;
the method specifically comprises the following steps:
s1, carrying out composite desulfurization treatment on molten iron through CaO and Mg, and completely slagging off the desulfurized molten iron to ensure that S in the molten iron fed into the furnace is less than or equal to 0.002%;
s2, adopting a top-bottom combined blowing mode by the converter, enabling the blowing end temperature to be more than or equal to 1680 ℃, and adopting oxygen-retaining operation for tapping;
s3, hoisting the molten steel to an RH furnace for vacuum treatment after tapping of the converter is finished, carrying out decarburization treatment under the condition that the vacuum degree is less than or equal to 3.0mbar, carrying out microalloying after decarburization is finished, and keeping vacuum for 15min after alloying is finished;
s4, carrying out desulfurization treatment and alloying operation in a L F furnace after the vacuum treatment is finished, and carrying out calcium treatment operation when S is less than or equal to 0.0010% and the alloy meets the specified requirements, wherein the calcium treatment uses a seamless pure calcium wire, the furnace is 180 m/furnace at the head, and the other furnaces are 150 m/furnace;
s5, adjusting a secondary cooling effect in the continuous casting process, cooling by adopting a strong cooling mode, ensuring that dynamic soft reduction is performed before 6 sections, simultaneously increasing the dynamic soft reduction, ensuring that the dynamic soft reduction reaches 8-10 mm, strictly forbidding use of electromagnetic stirring in the casting process, and controlling the compression ratio to be more than 7 times of the plate thickness in the rolling process.
2. The production method for improving the microsegregation of the acid-resistant pipeline according to the claim 1, wherein the production method comprises the following steps: the chemical components and the mass percentage are as follows: c: 0.010% -0.020%, Si: 0.10-0.20%, Mn: 0.80-1.00 percent of Ni, less than or equal to 0.015 percent of P, less than or equal to 0.0010 percent of S, 0.10-0.20 percent of Ni, 0.10-0.20 percent of Cu, less than or equal to 0.30 percent of Cr, less than or equal to 0.15 percent of Mo, and Nb: 0.02-0.04%, V0.010-0.020%, Ti: 0.010-0.020%, Ca: 0.0005% -0.0040%, Al: 0.010-0.050%, and the balance of Fe and inevitable impurities.
3. The production method for improving the microsegregation of the acid-resistant pipeline according to the claim 1, wherein the production method comprises the following steps: the chemical components and the mass percentage are as follows: c: 0.020% -0.030%, Si: 0.20-0.30%, Mn: 1.00-1.20 percent of Ni, less than or equal to 0.015 percent of P, less than or equal to 0.0010 percent of S, 0.20-0.30 percent of Ni, 0.20-0.30 percent of Cu, less than or equal to 0.30 percent of Cr, less than or equal to 0.15 percent of Mo, and Nb: 0.04-0.06%, V0.030-0.050%, Ti: 0.010-0.020%, Ca: 0.0005% -0.0040%, Al: 0.010-0.050%, and the balance of Fe and inevitable impurities.
4. The production method for improving the microsegregation of the acid-resistant pipeline according to the claim 1, wherein the production method comprises the following steps: the chemical components and the mass percentage are as follows: c: 0.010% -0.020%, Si: 0.10-0.20%, Mn: 1.20 to 1.40 percent of Ni, less than or equal to 0.013 percent of P, less than or equal to 0.0010 percent of S, 0.20 to 0.30 percent of Ni, 0.20 to 0.30 percent of Cu, Cr: 0.20% -0.30%, Mo: 0.08-0.13%, Nb: 0.06-0.07%, V0.020-0.030%, Ti: 0.010-0.020%, Ca: 0.0005% -0.0040%, Al: 0.010-0.050%, and the balance of Fe and inevitable impurities.
5. The production method for improving the microsegregation of the acid-resistant pipeline according to the claim 1, wherein the production method comprises the following steps: the chemical components and the mass percentage are as follows: c: 0.016%, Si: 0.18%, Mn: 0.88 percent, less than or equal to 0.011 percent of P, less than or equal to 0.0006 percent of S, 0.19 percent of Ni, 0.16 percent of Cu, Cr: 0.0230%, Mo: 0.03%, Nb: 0.036%, V:0.018%, Ti: 0.016%, Ca: 0.0016%, Al: 0.0350%, the balance being Fe and unavoidable impurities;
the method specifically comprises the following steps:
s1, carrying out composite desulfurization treatment on the molten iron through CaO and Mg, and deslagging the desulfurized molten iron to be clean so as to ensure that the molten iron S entering the furnace is: 0.002%;
s2, adopting a top-bottom combined blowing mode by the converter, keeping the blowing end temperature at 1689 ℃, and adopting oxygen-retaining operation for tapping;
s3, hoisting the molten steel to an RH furnace for vacuum treatment after tapping of the converter is finished, carrying out decarburization treatment under the condition that the vacuum degree is 2.0mbar, carrying out microalloying after decarburization is finished, and keeping vacuum for 15min after alloying is finished;
s4, carrying out desulfurization treatment and alloying operation in a L F furnace after the vacuum treatment is finished, and carrying out calcium treatment operation when the S is 0.00080% and the alloy meets the specified requirements, wherein the calcium treatment uses a seamless pure calcium wire, the furnace is 180 m/furnace at the head, and the other furnaces are 150 m/furnace;
s5, adjusting a secondary cooling effect in the continuous casting process, cooling by adopting a strong cooling mode, ensuring that dynamic soft reduction is performed before 6 sections, simultaneously increasing the dynamic soft reduction, ensuring that the dynamic soft reduction reaches 9mm, strictly forbidding use of electromagnetic stirring in the casting process, and controlling the compression ratio to be more than 7 times of the plate thickness in the rolling process.
6. The production method for improving the microsegregation of the acid-resistant pipeline according to the claim 1, wherein the production method comprises the following steps: the chemical components and the mass percentage are as follows: 0.023%, Si: 0.23%, Mn: 1.15 percent, less than or equal to 0.010 percent of P, less than or equal to 0.0008 percent of S, 0.23 percent of Ni, 0.24 percent of Cu, and the weight percentage of Cr: 0.0330%, mo.02%, Nb: 0.045%, V:0.033%, Ti: 0.017%, Ca: 0.0018%, Al: 0.033% and the balance Fe and inevitable impurities;
the method specifically comprises the following steps:
s1, carrying out composite desulfurization treatment on the molten iron through CaO and Mg, and deslagging the desulfurized molten iron to be clean so as to ensure that the molten iron S entering the furnace is: 0.002%;
s2, adopting a top-bottom combined blowing mode by the converter, keeping the blowing end temperature at 1693 ℃, and adopting oxygen-retaining operation for tapping;
s3, hoisting the molten steel to an RH furnace for vacuum treatment after tapping of the converter is finished, carrying out decarburization treatment under the condition that the vacuum degree is 3.0mbar, carrying out microalloying after decarburization is finished, and keeping vacuum for 15min after alloying is finished;
s4, carrying out desulfurization treatment and alloying operation in a L F furnace after the vacuum treatment is finished, and carrying out calcium treatment operation when the S is 0.00070% and the alloy meets the specified requirements, wherein the calcium treatment uses a seamless pure calcium wire, the furnace is 180 m/furnace at the head, and the other furnaces are 150 m/furnace;
s5, adjusting a secondary cooling effect in the continuous casting process, cooling by adopting a strong cooling mode, ensuring that dynamic soft reduction is performed before 6 sections, simultaneously increasing the dynamic soft reduction, ensuring that the dynamic soft reduction reaches 10mm, strictly forbidding use of electromagnetic stirring in the casting process, and controlling the compression ratio to be more than 7 times of the plate thickness in the rolling process.
7. The production method for improving the microsegregation of the acid-resistant pipeline according to the claim 1, wherein the production method comprises the following steps: the chemical components and the mass percentage are as follows: c: 0.013%, Si: 0.19%, Mn: 1.39 percent, less than or equal to 0.010 percent of P, less than or equal to 0.0007 percent of S, 0.26 percent of Ni, 0.23 percent of Cu, Cr: 0.27%, Mo: 0.11%, Nb: 0.065%, V:0.023%, Ti: 0.018%, Ca: 0.0015%, Al: 0.038%, the balance being Fe and unavoidable impurities;
the method specifically comprises the following steps:
s1, carrying out composite desulfurization treatment on the molten iron through CaO and Mg, and deslagging the desulfurized molten iron to be clean so as to ensure that the molten iron S entering the furnace is: 0.002%;
s2, adopting a top-bottom combined blowing mode by the converter, keeping the blowing end temperature at 1683 ℃, and adopting oxygen-retaining operation for tapping;
s3, hoisting the molten steel to an RH furnace for vacuum treatment after tapping of the converter is finished, carrying out decarburization treatment under the condition that the vacuum degree is 1.0mbar, carrying out microalloying after decarburization is finished, and keeping vacuum for 15min after alloying is finished;
s4, carrying out desulfurization treatment and alloying operation in a L F furnace after the vacuum treatment is finished, and carrying out calcium treatment operation when the S is 0.00090% and the alloy meets the specified requirements, wherein the calcium treatment uses a seamless pure calcium wire, the furnace is 180 m/furnace at the head, and the other furnaces are 150 m/furnace;
s5, adjusting a secondary cooling effect in the continuous casting process, cooling by adopting a strong cooling mode, ensuring that dynamic soft reduction is performed before 6 sections, simultaneously increasing the dynamic soft reduction, ensuring that the dynamic soft reduction reaches 10mm, strictly forbidding use of electromagnetic stirring in the casting process, and controlling the compression ratio to be more than 7 times of the plate thickness in the rolling process.
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| CN114737020A (en) * | 2022-04-27 | 2022-07-12 | 马鞍山钢铁股份有限公司 | High-precision control method for effective titanium component in steelmaking process |
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