CN111411189A - Method for producing hydrogen-induced crack resistant steel grade by using ultra-wide thin-ratio slab continuous casting machine - Google Patents
Method for producing hydrogen-induced crack resistant steel grade by using ultra-wide thin-ratio slab continuous casting machine 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
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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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
- B22D11/18—Controlling or regulating processes or operations for pouring
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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
- B22D11/20—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
-
- 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
- C21C7/06—Deoxidising, e.g. killing
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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
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a method for producing hydrogen induced cracking resistant steel grade by an ultra-wide thin ratio slab continuous casting machine, which sequentially comprises molten iron desulphurization pretreatment, oxygen converter steelmaking, L F refining, RH vacuum refining, calcium treatment and slab continuous casting, wherein the hydrogen content in molten steel is controlled by full flow program, the hydrogen content in the molten steel is monitored and controlled, and starting from the quality design of the steel grade, the invasion of hydrogen is prevented, corrosion products are stabilized, the contents of steel [ S ], [ C ], [ P ] and oxygen are reduced, the number and the size of inclusions are reduced, the process parameters of a soft reduction process, a secondary cooling water process, a pulling speed, a superheat degree and the like are optimized, and the center segregation of a casting blank is improved.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a method for producing hydrogen-induced crack resistant steel grade by using a super-wide thin-ratio slab continuous casting machine.
Background
In a steel for a line pipe, in an oil or gas environment containing hydrogen sulfide, a crack generated by intrusion of hydrogen into the steel due to corrosion is called hydrogen induced cracking, i.e., HIC. Hydrogen induced cracking generally includes hydrogen induced bubbling, hydrogen induced step cracking, and hydrogen fracturing. Hydrogen that enters the steel from a corrosive environment, and surface cracks due to high internal pressure are called hydrogen-induced bubbling, which often occurs at oxides. Hydrogen entering the steel is enriched in inclusions and segregation zones to form stepped cracks, which are called hydrogen-induced stepped cracking. The most common manifestation of HIC is hydrogen-induced step cracking, which is also commonly manifested as hydrogen blistering if the crack is near the surface of the steel tube.
The No. 1 slab continuous casting machine is a medium plate slab continuous casting machine with the maximum width-to-thickness ratio in the world, the maximum ratio reaches 22, the section of a continuous casting blank is 150 × 1600-3300 mm, the casting blank with the ultra-wide width-to-thickness ratio is extremely easy to cool unevenly in the width direction, central segregation uncontrollable performance of the casting blank is further improved, production of varieties with extremely high requirements on the internal quality of the casting blank is restricted, particularly, steel types with hydrogen induced crack resistance (HIC) requirements are more rigorous on the internal quality of the casting blank, but the internal quality of the casting blank cannot stably meet the requirements of the HIC resistant steel types, and the contradiction between production and quality stability.
Disclosure of Invention
The invention aims to solve the problems of low quality, severe hydrogen-induced cracking and the like of steel produced by the existing ultra-wide thin ratio slab continuous casting machine, and provides a method for producing a hydrogen-induced cracking resistant steel grade by the ultra-wide thin ratio slab continuous casting machine, which can effectively reduce the defect of casting blank segregation, meet the production of high-quality varieties in casting blanks and prevent the generation of hydrogen-induced cracking of the steel grade.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for producing hydrogen-induced crack resistant steel grade by using a super-wide thin-ratio slab continuous casting machine comprises the following specific steps:
(1) firstly, carrying out desulfurization pretreatment on molten iron;
(2) oxygen converter steelmaking: dephosphorizing by smelting in a converter, blocking slag during tapping, and controlling the final [ C ] to be less than or equal to 0.05% and the final [ P ] to be less than or equal to 0.013% in molten steel so as to prevent hydrogen-induced crack propagation, reduce a central hardening structure and reduce the content of C, P;
(3) l F refining, wherein during steel quality design, Cu, Ni and Cr alloys are added into molten steel, wherein Cu accounts for 0.10-0.30%, Cr accounts for 0.10-0.30%, and Ni accounts for 0.10-0.30%, so as to prevent hydrogen intrusion and stabilize corrosion products, secondly, L F refining furnace is used for making high-alkalinity and strong-reducibility refining slag deep desulfurization, controlling [ S ] to be less than or equal to 0.0010%, simultaneously L F refining slag is in white slag deep deoxidation, controlling FeO + MnO content to be less than or equal to 0.8%, so as to prevent hydrogen induced cracking and reduce the content of steel S and O;
(4) RH vacuum refining: refining the molten steel in an RH vacuum furnace, wherein the RH vacuum time is prolonged by 5min so as to control the hydrogen content of the molten steel;
(5) calcium treatment: the pure calcium wire is utilized to carry out molten steel calcium treatment, the calcium treatment effect is improved, and sulfide inclusions in steel are modified, namely the form of the inclusions is controlled; fully utilizing the mechanisms of nucleation, collision growth and removal of deoxidation inclusions, prolonging the vacuum time to 20min and the static stirring time to be more than or equal to 15min so as to reduce the number and size of inclusions in the molten steel;
(6) slab continuous casting: and judging the microsegregation of the casting blank by using a dendritic crystal detection method, optimizing the secondary cooling strength and the continuous casting tundish process, adjusting the dynamic soft reduction position and the reduction amount, and controlling the continuous casting pulling speed so as to improve the central segregation condition of the casting blank.
Further, in the step (6), the secondary cooling strength specific water amount is more than or equal to 0.8L/kg, so as to control the solidification structure of the casting blank.
Further, in the step (6), the superheat degree of the tundish is controlled at 10-25 ℃ so as to control the solidification structure of the casting blank.
Further, in the step (6), the baking time of the continuous casting tundish is prolonged to 240min, hydrogen is determined in the continuous casting tundish, the hydrogen content of the molten steel is detected, and if the hydrogen content is more than or equal to 1.8ppm, the casting blank is placed into a heating type heat preservation pit for slow cooling for more than or equal to 48 hours so as to increase the hydrogen diffusion condition of the casting blank.
Furthermore, in the step (6), the reduction position is controlled at 2 fan-shaped sections, the reduction is more than or equal to 4mm, and the reduction rate is more than or equal to 1mm/m, so that the liquid phase volume shrinkage caused by solidification shrinkage is just compensated, the light reduction and the reduction efficiency are increased, and the center segregation of the casting blank is improved.
Further, in the step (6), the continuous casting drawing speed is controlled to be 1.0-1.1 m/min, and the dynamic soft reduction period is controlled to be distributed in 2 fan-shaped section areas so as to improve the reduction efficiency.
Further, in the step (5) and the step (6), the secondary oxidation of the molten steel caused by calcium treatment splashing and continuous casting protection casting is controlled, and finally the oxygen content in the molten steel is controlled to be less than or equal to 12 ppm.
According to the technical scheme, the hydrogen content in the molten steel is controlled through full flow control, and the hydrogen content in the molten steel is monitored and controlled; secondly, starting from the quality design of steel grades, preventing hydrogen from invading and stabilizing corrosion products; then, in order to prevent the generation of hydrogen induced cracks, the contents of steel [ S ] and oxygen are reduced, and the number and the size of inclusions are reduced; meanwhile, in order to prevent hydrogen induced crack propagation, the central hardening structure is reduced, and the contents of [ C ] and [ P ] are reduced; and finally, the center segregation of the casting blank is improved by optimizing the process parameters such as a soft reduction process, a secondary cooling water process, a pulling speed, a superheat degree and the like. The method is particularly suitable for a slab caster with ultra-wide thin ratio specification, can effectively reduce the defects of casting blank segregation and the like, ensures that the internal quality of the casting blank meets the steel grade requirement of hydrogen induced crack resistance, and achieves the stable production quality by reaching more than 99 percent of the qualified rate of hydrogen induced crack resistance detection.
Drawings
FIG. 1 is a process flow diagram of the method of producing a hydrogen induced cracking resistant steel grade according to the present invention.
Detailed Description
Example 1
In order that the present invention may be more clearly understood, a method for producing a hydrogen induced cracking resistant steel grade for a super broad aspect ratio slab caster of the present invention will be further described with reference to the accompanying drawings, and the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
A method for producing hydrogen-induced crack resistant steel grade by a super-wide thin-ratio slab continuous casting machine comprises the following specific steps:
(1) firstly, carrying out desulfurization pretreatment on molten iron;
(2) oxygen converter steelmaking: dephosphorizing by smelting in a converter, blocking slag during tapping, and controlling the final [ C ] to be less than or equal to 0.05% and the final [ P ] to be less than or equal to 0.013% in molten steel so as to prevent hydrogen-induced crack propagation, reduce a central hardening structure and reduce the content of C, P;
(3) l F refining, wherein during steel quality design, Cu, Ni and Cr alloys are added into molten steel, wherein Cu accounts for 0.10-0.30%, Cr accounts for 0.10-0.30%, and Ni accounts for 0.10-0.30%, so as to prevent hydrogen intrusion and stabilize corrosion products, secondly, L F refining furnace is used for making high-alkalinity and strong-reducibility refining slag deep desulfurization, controlling [ S ] to be less than or equal to 0.0010%, simultaneously L F refining slag is in white slag deep deoxidation, controlling FeO + MnO content to be less than or equal to 0.8%, so as to prevent hydrogen induced cracking and reduce the content of steel S and O;
(4) RH vacuum refining: refining the molten steel in an RH vacuum furnace, wherein the RH vacuum time is prolonged by 5min so as to control the hydrogen content of the molten steel;
(5) calcium treatment: the pure calcium wire is utilized to carry out molten steel calcium treatment, the calcium treatment effect is improved, and sulfide inclusions in steel are modified, namely the form of the inclusions is controlled; fully utilizing the mechanisms of nucleation, collision growth and removal of deoxidation inclusions, prolonging the vacuum time to 20min and the static stirring time to be more than or equal to 15min so as to reduce the number and size of inclusions in the molten steel; meanwhile, controlling the secondary oxidation of molten steel caused by calcium treatment splashing and continuous casting protection casting, and finally controlling the oxygen content in the molten steel to be less than or equal to 12 ppm;
(6) improving the center segregation of the casting blank in the slab continuous casting area:
a. judging the microsegregation of the casting blank by using a dendrite detection method;
b. optimizing secondary cooling strength and a continuous casting tundish process, wherein the specific water amount of the secondary cooling strength is more than or equal to 0.8L/kg, the superheat degree of a tundish is controlled at 10-25 ℃, the baking time of the continuous casting tundish is prolonged to 240min, hydrogen is determined in the continuous casting tundish, the hydrogen content of molten steel is detected, and if the hydrogen content is more than or equal to 1.8ppm, a casting blank is placed into a heating type heat preservation pit for slow cooling for more than or equal to 48 hours so as to increase the hydrogen diffusion condition of the casting blank;
c. adjusting the dynamic soft reduction position and the reduction, controlling the reduction position at 2 fan-shaped sections, wherein the reduction is more than or equal to 4mm, and the reduction rate is more than or equal to 1mm/m, so as to just compensate the liquid phase volume shrinkage caused by solidification shrinkage, increase the soft reduction and the reduction efficiency, and improve the center segregation of the casting blank;
d. the continuous casting drawing speed is controlled to be 1.0-1.1 m/min, and the continuous casting drawing speed is controlled to be distributed in 2 fan-shaped section areas during dynamic soft reduction so as to improve the reduction efficiency.
In the invention, (1) the hydrogen content in the molten steel is controlled through full flow control, and the hydrogen content in the molten steel is monitored and controlled; (2) starting from the quality design of the steel grade, preventing the invasion of hydrogen and stabilizing corrosion products; (3) prevent the generation of hydrogen induced cracks, reduce the contents of steel [ S ] and oxygen, and reduce the number and size of inclusions; (4) prevent hydrogen induced crack propagation, reduce central hardening structure and reduce the contents of [ C ] and [ P ]; (5) by optimizing the process parameters such as a soft reduction process, a secondary cooling water process, a pulling speed, a superheat degree and the like, the center segregation of the casting blank is improved.
The method is particularly suitable for a slab caster with ultra-wide thin ratio specification, can effectively reduce the defects of casting blank segregation and the like, ensures that the internal quality of the casting blank meets the steel grade requirement of hydrogen induced crack resistance, and achieves the stable production quality by reaching more than 99 percent of the qualified rate of hydrogen induced crack resistance detection.
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 method for producing hydrogen-induced crack resistant steel grade by a super-wide thin-ratio slab continuous casting machine comprises the following specific steps:
(1) firstly, carrying out desulfurization pretreatment on molten iron;
(2) oxygen converter steelmaking: dephosphorizing by smelting in a converter, and pushing off slag during tapping, wherein the final [ C ] is controlled to be less than or equal to 0.05%, and the final [ P ] is controlled to be less than or equal to 0.013%;
(3) l F refining, namely adding Cu, Ni and Cr alloys into molten steel, wherein 0.10-0.30 percent of Cu, 0.10-0.30 percent of Cr, 0.10-0.30 percent of Ni and L F refining furnace are used for deep desulfurization of high-alkalinity and strong-reducibility refining slag, the content of [ S ] is controlled to be less than or equal to 0.0010 percent, meanwhile, the color of L F refining slag is white slag deep deoxidation, and the content of FeO and MnO is controlled to be less than or equal to 0.8 percent;
(4) RH vacuum refining: refining the molten steel in an RH vacuum furnace, wherein the RH vacuum time is prolonged by 5 min;
(5) calcium treatment: carrying out molten steel calcium treatment by using a pure calcium wire, carrying out morphological control on sulfide inclusions in steel, fully utilizing the nucleation, collision growth and removal mechanisms of deoxidation inclusions, prolonging the vacuum time to 20min, and keeping the static stirring time to be more than or equal to 15 min;
(6) slab continuous casting: and judging the microsegregation of the casting blank by using a dendritic crystal detection method, optimizing the secondary cooling strength and the continuous casting tundish process, adjusting the dynamic soft reduction position and the reduction amount, and controlling the continuous casting drawing speed.
2. The method for ultra-wide aspect ratio slab caster producing hydrogen induced cracking resistant steel grade according to claim 1, characterized in that:
in the step (6), the secondary cooling strength specific water amount is more than or equal to 0.8L/kg.
3. The method for producing a hydrogen-induced cracking resistant steel grade for an ultra-wide thin ratio slab caster according to claim 1 or 2, characterized in that:
in the step (6), the degree of superheat of the tundish is controlled to be 10-25 ℃.
4. The method for producing a hydrogen-induced cracking resistant steel grade for an ultra-wide thin ratio slab caster according to claim 1 or 2, characterized in that:
and (6) prolonging the baking time of the continuous casting tundish to 240min, determining hydrogen in the continuous casting tundish, detecting the hydrogen content of molten steel, and if the hydrogen content is more than or equal to 1.8ppm, putting the casting blank into a heating type heat preservation pit for slow cooling for more than or equal to 48 hours.
5. The method for producing a hydrogen-induced cracking resistant steel grade for an ultra-wide thin ratio slab caster according to claim 1 or 2, characterized in that:
in the step (6), the pressing position is controlled to be 2 fan-shaped sections, the pressing amount is more than or equal to 4mm, and the pressing rate is more than or equal to 1 mm/m.
6. The method for producing a hydrogen-induced cracking resistant steel grade for an ultra-wide thin ratio slab caster according to claim 1 or 2, characterized in that:
in the step (6), the continuous casting drawing speed is controlled to be 1.0-1.1 m/min, and the continuous casting drawing speed is controlled to be distributed in 2 sector areas during the dynamic soft reduction.
7. The method for producing a hydrogen-induced cracking resistant steel grade for an ultra-wide thin ratio slab caster according to claim 1 or 2, characterized in that:
in the step (5) and the step (6), the secondary oxidation of the molten steel caused by calcium treatment splashing and continuous casting protection casting is controlled, and finally the oxygen content in the molten steel is controlled to be less than or equal to 12 ppm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114643341A (en) * | 2022-03-18 | 2022-06-21 | 安阳钢铁股份有限公司 | Method for eliminating surface bubbling defect of common oriented silicon steel plate |
| CN115896593A (en) * | 2022-11-02 | 2023-04-04 | 河钢乐亭钢铁有限公司 | Control method for bubbling defect of low-carbon steel continuous casting slab |
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Cited By (2)
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| CN114643341A (en) * | 2022-03-18 | 2022-06-21 | 安阳钢铁股份有限公司 | Method for eliminating surface bubbling defect of common oriented silicon steel plate |
| CN115896593A (en) * | 2022-11-02 | 2023-04-04 | 河钢乐亭钢铁有限公司 | Control method for bubbling defect of low-carbon steel continuous casting slab |
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Application publication date: 20200714 |