CN112281055A - Low-carbon steel plate with excellent low-temperature impact toughness performance and production method thereof - Google Patents
Low-carbon steel plate with excellent low-temperature impact toughness performance and production method thereof Download PDFInfo
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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
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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
- C21C7/072—Treatment with gases
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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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- 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
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
Abstract
The invention discloses a low-carbon steel plate with excellent low-temperature impact toughness and a production method thereof, wherein the steel plate comprises the following chemical components in percentage by mass: c: less than or equal to 0.12 percent, Si: 0.15 to 0.50%, Mn: 1.4-1.5%, P is less than or equal to 0.01%, S is less than or equal to 0.003%, Ni: less than or equal to 0.50 percent, Cr: less than or equal to 0.25 percent, Nb: less than or equal to 0.020%, and the balance of Fe and inevitable impurities; the production method comprises the working procedures of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment. The invention adopts low-C, adds the components of Ni, Nb and Cr, meets the higher requirement of the market on the low-carbon steel plate with excellent low-temperature impact toughness performance through the quenching and tempering heat treatment process, and realizes the upgrading and updating of the traditional product.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a low-carbon steel plate with excellent low-temperature impact toughness and a production method thereof.
Background
The steel type SA537CL2 is a traditional container steel, a common component system is a low-C and low-Mn component system, the C content is 0.12-0.14%, the Mn content is 1.50-1.60%, and in order to meet the requirements of the strength and the low-temperature impact performance of a steel plate, the CE of the steel plate is generally required to be about 0.45% (CE = C + Mn/6+ (Cr + Mo + V)/5 + (Ni + Cu)/15, and the CE in the following description adopts the formula).
In order to meet the requirements of the market on excellent low-temperature impact toughness and excellent welding performance of the steel plate, the existing technological process and component design of the steel plate need to be optimized and reproduced, the higher quality requirement is met by using lower carbon content and carbon equivalent, meanwhile, the alloy usage is reduced, the production cost is reduced, and the old variety is upgraded and updated. The current process optimization idea mainly comprises the following steps: firstly, the C content and the Mn content are reduced, and microalloy Nb, Cr and Ni elements beneficial to the impact toughness of the steel plate are added, so that the low carbon equivalent of the steel plate is ensured, and simultaneously, various performance indexes of the steel plate meet the standard requirements; optimizing a second pair of heat treatment processes, wherein the original component design has high C content and high CE, and the heat treatment processes are quenching and tempering, wherein the tempering temperature is 650-670 ℃; by adopting the component design with low C, Mn content and low CE, the original heat treatment process can not meet the performance index of the steel plate, and the product performance can be improved by adopting the mode of optimizing the heat treatment process.
Disclosure of Invention
The invention aims to provide a low-carbon steel plate with excellent low-temperature impact toughness and a production method thereof. The invention meets the requirement of low-temperature impact toughness of the steel plate by adopting low C, Mn and low CE component design, ensures the strength level of the steel plate by reducing the tempering temperature through a quenching and tempering heat treatment process, optimizes the internal structure of the steel plate by adding microalloy Nb, Cr and Ni elements, realizes the requirement of excellent low-temperature impact toughness and excellent welding performance of the SA537CL2 steel plate, and achieves the upgrading and updating of the traditional old products.
In order to solve the technical problems, the invention adopts the technical scheme that:
the low-carbon steel plate with excellent low-temperature impact toughness performance comprises the following chemical components in percentage by mass: c: less than or equal to 0.12 percent, Si: 0.15 to 0.50%, Mn: 1.4-1.5%, P is less than or equal to 0.01%, S is less than or equal to 0.003%, Ni: less than or equal to 0.50 percent, Cr: less than or equal to 0.25 percent, Nb: less than or equal to 0.020 percent, and the balance of Fe and inevitable impurities.
The thickness specification of the steel plate is 8-60 mm; CE of the steel plate is less than or equal to 0.43 percent.
The steel plate has a delivery state of-68 ℃ and a transverse impact mean value of more than or equal to 200J; the steel plate delivery state performance: the yield strength is not less than 415MPa, the tensile strength is 550-690 MPa, and the elongation is not less than 22%.
The invention also provides a production method of the low-carbon steel plate with excellent low-temperature impact toughness performance, which comprises the working procedures of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment; in the heat treatment process, the quenching heat preservation temperature is 880-910 ℃, the heat preservation coefficient is 2.0-4.0 min/mm, the heat preservation time is more than or equal to 60min, and the steel plate is taken out of the furnace and cooled by water; the tempering heat preservation temperature is 630-650 ℃, the heat preservation coefficient is 2.5-4.5 min/mm, the heat preservation time is more than or equal to 60min, and the steel plate is discharged from a furnace and cooled in air.
In the smelting process, the steel ladle is well baked, and the baking temperature is more than or equal to 910 ℃; the tapping is not allowed to see slag, the tapping temperature is higher than 1610 ℃, and the tapping C is less than or equal to 0.10 percent. The refined materials are adopted as far as possible, and no briquetting, slag steel, ladle bottom, waste ingot mould and the like are added, so that the steel grade cannot be smelted when a new ladle, a large fettling furnace and the furnace condition are abnormal.
According to the LF refining process, good argon blowing is guaranteed in the whole process, the maintaining time of refined white slag is more than or equal to 30min, the total time of LF refining is more than or equal to 60min, the consumption of aluminum wires is 3-5 kg/t of steel, the consumption of lime is more than or equal to 18 kg/t of steel, the consumption of deoxidizer ferrosilicon is more than or equal to 2.5 kg/t of steel, the aluminum content in the process is more than or equal to 0.016%, the drossing aluminum is more than or equal to 0.021%, and S is less than or equal to 0.
According to the VD vacuum refining process, the vacuum degree is less than or equal to 35Pa, the vacuum maintaining time is more than or equal to 25min, 1.5-3 kg of Ca-Fe wire per t of steel is added before vacuum, argon cannot be blown greatly during vacuum pumping, the argon flow is 270-330L/min, and the Al wire is not allowed to be fed after vacuum pumping.
In the continuous casting process, the liquidus temperature is 1514-1530 ℃; the thickness of the continuous casting billet is 200-330 mm.
According to the heating process, the maximum heating temperature is 1250 ℃, the temperature of a soaking section is 1225-1245 ℃, the heat preservation time of the soaking section is more than or equal to 70min, the heating time coefficient is more than or equal to 10min/mm, and the thorough burning and uniformity of the steel billet are ensured.
In the heating procedure, the initial rolling temperature at the stage II is 900-920 ℃, the final rolling temperature is 780-880 ℃, and the water cooling and re-reddening temperature is 680-730 ℃.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the low-carbon steel plate is designed by adopting low C and Mn and adding components of Ni, Cr and Nb, and the low-carbon steel plate with excellent low-temperature impact toughness and welding performance has the thickness specification of 8-60 mm and the CE (carbon element) of the steel plate is less than or equal to 0.43 percent through a quenching and tempering heat treatment process for reducing the tempering temperature; the average value of transverse impact of the steel plate in the delivery state at minus 68 ℃ is more than or equal to 200J; the steel plate delivery state performance: the yield strength is not less than 415MPa, the tensile strength is 550-690 MPa, and the elongation is not less than 22%. 2. The invention meets the higher requirement of the market on the low-carbon steel plate with excellent low-temperature impact toughness performance, and realizes the upgrading and updating of the traditional products.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The thickness of the low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance in the embodiment is 18mm, and the chemical component composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance comprises the following steps of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and the specific process steps are as follows:
(1) smelting: the steel ladle is well baked, and the baking temperature is 915 ℃; not allowing tapping to see slag, wherein the tapping temperature is 1610 ℃, and the tapping C: 0.08 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the white slag refining time is 32min, the LF refining total time is 62min, the consumption of aluminum wires is 3.1 kg/t steel, the consumption of lime is 18 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.6 kg/t steel, the aluminum content in the process is 0.018%, the slagging aluminum is 0.022%, and the refining is finished S: 0.004%;
(3) VD vacuum refining: the vacuum degree is 35Pa, the vacuum maintaining time is 25min, 1.6 kg of Ca-Fe wire per t of steel is added before vacuum, argon can not be blown greatly during vacuum pumping, the argon flow is 280L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 200mm, and the liquidus temperature is 1528 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1235 ℃, the heat preservation time of the soaking section is 75min, the heating time coefficient is 13min/mm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: the initial rolling temperature of the stage II is 905 ℃, the final rolling temperature is 860 ℃, and the water cooling and red returning temperature is 720 ℃;
(7) a heat treatment process: the quenching heat preservation temperature is 900 ℃, the heat preservation coefficient is 4min/mm, the heat preservation time is 72min, and the cooling is accelerated; the tempering heat preservation temperature is 650 ℃, the heat preservation coefficient is 4.5min/mm, the heat preservation time is 81min, and the steel plate is discharged from a furnace and cooled in air.
The indexes of the properties in the delivery state of the low carbon steel plate SA537CL2 excellent in low temperature impact toughness and weldability according to this example are shown in Table 2.
Example 2
The low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance of the embodiment has the thickness of 25mm, and the chemical component composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance comprises the following steps of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and the specific process steps are as follows:
(1) smelting: the steel ladle is well baked, and the baking temperature is 930 ℃; and (3) not allowing tapping to see slag, wherein the tapping temperature is 1630 ℃, and the tapping temperature is as follows: 0.08 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the maintaining time of refined white slag is 30min, the total LF refining time is 65min, the consumption of aluminum wires is 3.8 kg/t steel, the consumption of lime is 23 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.7 kg/t steel, the aluminum content in the process is 0.020%, the slagging aluminum is 0.022%, and the refining is finished S: 0.003%;
(3) VD vacuum refining: the vacuum degree is 35Pa, the vacuum maintaining time is 26min, 2.2 kg of Ca-Fe wire per t of steel is added before vacuum, argon can not be blown greatly during vacuum pumping, the argon flow is 320L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 200mm, and the liquidus temperature is 1518 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1239 ℃, the heat preservation time of the soaking section is 75min, the heating time coefficient is 15min/mm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: the initial rolling temperature of the stage II is 905 ℃, the final rolling temperature is 810 ℃, and the water cooling and red returning temperature is 710 ℃;
(7) a heat treatment process: the quenching heat preservation temperature is 910 ℃, the heat preservation coefficient is 3.0min/mm, the heat preservation time is 75min, and the cooling is accelerated; the tempering heat preservation temperature is 650 ℃, the heat preservation coefficient is 3.0min/mm, the heat preservation time is 75min, and the steel plate is discharged from a furnace and cooled in air.
The indexes of the properties in the delivery state of the low carbon steel plate SA537CL2 excellent in low temperature impact toughness and weldability according to this example are shown in Table 2.
Example 3
The low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance of the embodiment has the thickness of 33mm, and the chemical component composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance comprises the following steps of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and the specific process steps are as follows:
(1) smelting: the steel ladle is well baked at the baking temperature of 940 ℃; not allowing tapping to see slag, wherein the tapping temperature is 1615 ℃, and the tapping temperature is as follows: 0.07 percent;
(2) an LF refining procedure: the argon blowing is guaranteed to be good in the whole process, the refining white slag keeping time is 35min, the LF refining total time is 65min, the consumption of aluminum wires is 3.1 kg/t steel, the consumption of lime is 18 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.8 kg/t steel, the aluminum content in the process is 0.017%, the slagging aluminum is 0.022%, and the refining is finished S: 0.002%;
(3) VD vacuum refining: the vacuum degree is 35Pa, the vacuum maintaining time is 30min, 1.7 kg of Ca-Fe wire per t of steel is added before vacuum, argon can not be blown greatly during vacuum pumping, the argon flow is 300L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 200mm, and the liquidus temperature is 1530 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1225 ℃, the heat preservation time of the soaking section is 85min, the heating time coefficient is 13min/mm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: the beginning rolling temperature of the stage II is 900 ℃, the finishing rolling temperature is 790 ℃, and the water cooling and red returning temperature is 690 ℃;
(7) a heat treatment process: the quenching heat preservation temperature is 910 ℃, the heat preservation coefficient is 2.0min/mm, the heat preservation time is 66min, and the cooling is accelerated; the tempering heat preservation temperature is 645 ℃, the heat preservation coefficient is 2.5min/mm, the heat preservation time is 82.5min, and the steel plate is discharged from a furnace and cooled in air.
The indexes of the properties in the delivery state of the low carbon steel plate SA537CL2 excellent in low temperature impact toughness and weldability according to this example are shown in Table 2.
Example 4
The thickness of the low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance in the embodiment is 42mm, and the chemical component composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance comprises the following steps of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and the specific process steps are as follows:
(1) smelting: the steel ladle is well baked, and the baking temperature is 935 ℃; and (3) not allowing tapping to see slag, wherein the tapping temperature is 1628 ℃, and the tapping C: 0.06 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the white slag refining time is 40min, the total LF refining time is 65min, the consumption of aluminum wires is 4.0 kg/t steel, the consumption of lime is 18 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.6 kg/t steel, the aluminum content in the process is 0.018%, the slagging aluminum is 0.025%, and the refining is finished S: 0.003%;
(3) VD vacuum refining: the vacuum degree is 35Pa, the vacuum maintaining time is 35min, 1.6 kg of Ca-Fe wire per t of steel is added before vacuum, argon can not be blown greatly during vacuum pumping, the argon flow is 320L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 300mm, and the liquidus temperature is 1520 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1240 ℃, the heat preservation time of the soaking section is 90min, the heating time coefficient is 13min/mm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: the start rolling temperature of the stage II is 920 ℃, the finish rolling temperature is 870 ℃, and the water cooling temperature of the stage II is 700 ℃;
(7) a heat treatment process: the quenching heat preservation temperature is 880 ℃, the heat preservation coefficient is 2min/mm, the heat preservation time is 84min, and the cooling is accelerated; the tempering heat preservation temperature is 645 ℃, the heat preservation coefficient is 3.0min/mm, the heat preservation time is 126min, and the steel plate is discharged from the furnace and cooled in air.
The indexes of the properties in the delivery state of the low carbon steel plate SA537CL2 excellent in low temperature impact toughness and weldability according to this example are shown in Table 2.
Example 5
The thickness of the low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance in the embodiment is 46mm, and the chemical component composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance comprises the following steps of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and the specific process steps are as follows:
(1) smelting: the steel ladle is well baked at the baking temperature of 940 ℃; and (3) not allowing tapping to see slag, wherein the tapping temperature is 1630 ℃, and the tapping temperature is as follows: 0.05 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the maintaining time of refined white slag is 36min, the total time of LF refining is 60min, the consumption of aluminum wires is 4.0 kg/t steel, the consumption of lime is 21 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.6 kg/t steel, the aluminum content in the process is 0.021%, the slagging aluminum is 0.023%, and the refining is finished S: 0.002%;
(3) VD vacuum refining: the vacuum degree is 35Pa, the vacuum maintaining time is 27min, 1.7 kg of Ca-Fe wire per t of steel is added before vacuum, argon can not be blown greatly during vacuum pumping, the argon flow is 330L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 200mm, and the liquidus temperature is 1514 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1245 ℃, the heat preservation time of the soaking section is 87min, the heating time coefficient is 15min/mm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: in the stage II, the initial rolling temperature is 920 ℃, the final rolling temperature is 780 ℃, and the water cooling and red returning temperature is 680 ℃;
(7) a heat treatment process: the quenching heat preservation temperature is 890 ℃, the heat preservation coefficient is 2.5min/mm, the heat preservation time is 115min, and the cooling is accelerated; the tempering heat preservation temperature is 635 ℃, the heat preservation coefficient is 3.0min/mm, the heat preservation time is 138min, and the steel plate is discharged from a furnace and cooled in air.
The indexes of the properties in the delivery state of the low carbon steel plate SA537CL2 excellent in low temperature impact toughness and weldability according to this example are shown in Table 2.
Example 6
The thickness of the low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance in the embodiment is 50mm, and the chemical component composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance comprises the following steps of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and the specific process steps are as follows:
(1) smelting: the steel ladle is well baked, and the baking temperature is 910 ℃; and (3) not allowing tapping to see slag, wherein the tapping temperature is 1616 ℃, and the tapping C: 0.10 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the maintaining time of refined white slag is 34min, the total LF refining time is 65min, the consumption of aluminum wires is 3.2 kg/t steel, the consumption of lime is 21 kg/t steel, the consumption of deoxidizer ferrosilicon is 3.0 kg/t steel, the aluminum content in the process is 0.017%, the slagging-off aluminum is 0.022%, and the refining is finished S: 0.001 percent;
(3) VD vacuum refining: the vacuum degree is 35Pa, the vacuum maintaining time is 35min, 2.3 kg of Ca-Fe wire is added before vacuum per t of steel, argon can not be blown greatly during vacuum pumping, the argon flow is 295L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 200mm, and the liquidus temperature is 1522 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1227 ℃, the heat preservation time of the soaking section is 74min, the heating time coefficient is 13.5min/mm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: the beginning rolling temperature of the stage II is 900 ℃, the finishing rolling temperature is 790 ℃, and the water cooling and red returning temperature is 685 ℃;
(7) a heat treatment process: the quenching heat preservation temperature is 890 ℃, the heat preservation coefficient is 2min/mm, the heat preservation time is 100min, and the cooling is accelerated; the tempering heat preservation temperature is 630 ℃, the heat preservation coefficient is 2.3min/mm, the heat preservation time is 115min, and the steel plate is discharged from a furnace and cooled in air.
The indexes of the properties in the delivery state of the low carbon steel plate SA537CL2 excellent in low temperature impact toughness and weldability according to this example are shown in Table 2.
Example 7
The low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance of the embodiment has the thickness of 55mm, and the chemical component composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance comprises the following steps of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and the specific process steps are as follows:
(1) smelting: the steel ladle is well baked, and the baking temperature is 900 ℃; and (3) not allowing tapping to see slag, wherein the tapping temperature is 1618 ℃, and the tapping temperature is as follows: 0.05 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the refining white slag is kept for 35min, the LF refining total time is 75min, the consumption of aluminum wires is 2.8 kg/t steel, the consumption of lime is 25 kg/t steel, the consumption of deoxidizer ferrosilicon is 3.2 kg/t steel, the aluminum content in the process is 0.018%, the slagging aluminum is 0.022%, and the refining is finished S: 0.003%;
(3) VD vacuum refining: the vacuum degree is 35Pa, the vacuum maintaining time is 25min, 2.3 kg of Ca-Fe wire is added before vacuum per t of steel, argon can not be blown greatly during vacuum pumping, the argon flow is 315L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 300mm, and the liquidus temperature is 1529 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1225 ℃, the heat preservation time of the soaking section is 80min, the heating time coefficient is 13min/mm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: the initial rolling temperature of stage II is 910 ℃, the final rolling temperature is 805 ℃, and the water-cooling re-reddening temperature is 710 ℃;
(7) a heat treatment process: the quenching heat preservation temperature is 910 ℃, the heat preservation coefficient is 2.4min/mm, the heat preservation time is 132min, and the cooling is accelerated; the tempering heat preservation temperature is 635 ℃, the heat preservation coefficient is 3.5min/mm, the heat preservation time is 193min, and the steel pipe is discharged from the furnace and cooled in air.
The indexes of the properties in the delivery state of the low carbon steel plate SA537CL2 excellent in low temperature impact toughness and weldability according to this example are shown in Table 2.
Example 8
The low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance of the embodiment has the thickness of 60mm, and the chemical component composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA537CL2 with excellent low-temperature impact toughness and welding performance comprises the following steps of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling and heat treatment, and the specific process steps are as follows:
(1) smelting: the steel ladle is well baked at 945 ℃; and (3) not allowing tapping to see slag, wherein the tapping temperature is 1628 ℃, and the tapping C: 0.07 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the maintaining time of refined white slag is 32min, the total time of LF refining is 60min, the consumption of aluminum wires is 5.0 kg/t steel, the consumption of lime is 18 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.5 kg/t steel, the aluminum content in the process is 0.016%, the slagging-off aluminum is 0.023%, and the refining is finished S: 0.003%;
(3) VD vacuum refining: the vacuum degree is 35Pa, the vacuum maintaining time is 26min, 1.9 kg of Ca-Fe wire per t of steel is added before vacuum, argon can not be blown greatly during vacuum pumping, the argon flow is 325L/min, and Al wire feeding is not allowed after vacuum pumping;
(4) and (3) continuous casting process: the thickness of the continuous casting billet is 330mm, and the liquidus temperature is 1530 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1245 ℃, the heat preservation time of the soaking section is 78min, the heating time coefficient is 13.5min/mm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: the second stage is that the initial rolling temperature is 905 ℃, the final rolling temperature is 840 ℃, and the water cooling and red returning temperature is 690 ℃;
(7) a heat treatment process: the quenching heat preservation temperature is 900 ℃, the heat preservation coefficient is 2.5min/mm, the heat preservation time is 150min, and the cooling is accelerated; the tempering heat preservation temperature is 630 ℃, the heat preservation coefficient is 3.5min/mm, the heat preservation time is 210min, and the steel plate is discharged from the furnace and cooled in air.
The indexes of the properties in the delivery state of the low carbon steel plate SA537CL2 excellent in low temperature impact toughness and weldability according to this example are shown in Table 2.
Table 1 chemical composition and mass% of steel sheets of examples 1 to 8
Note: the balance of the ingredients in table 1 is Fe and unavoidable impurities.
TABLE 2 examples 1-8 steel sheet delivery Performance index
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (10)
1. The low-carbon steel plate with excellent low-temperature impact toughness performance is characterized by comprising the following chemical components in percentage by mass: c: less than or equal to 0.12 percent, Si: 0.15 to 0.50%, Mn: 1.4-1.5%, P is less than or equal to 0.01%, S is less than or equal to 0.003%, Ni: less than or equal to 0.50 percent, Cr: less than or equal to 0.25 percent, Nb: less than or equal to 0.020 percent, and the balance of Fe and inevitable impurities.
2. The low carbon type steel plate with excellent low temperature impact toughness property as claimed in claim 1, wherein the thickness specification of the steel plate is 8-60 mm; CE of the steel plate is less than or equal to 0.43 percent.
3. The low-carbon steel plate with excellent low-temperature impact toughness property according to claim 1, wherein the steel plate has a delivery state of-68 ℃ transverse impact mean value of not less than 200J; the steel plate delivery state performance: the yield strength is not less than 415MPa, the tensile strength is 550-690 MPa, and the elongation is not less than 22%.
4. The method for producing a low carbon type steel plate excellent in low temperature impact toughness property according to any one of claims 1 to 3, wherein the production method comprises the steps of smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling, and heat treatment; in the heat treatment process, the quenching heat preservation temperature is 880-910 ℃, the heat preservation coefficient is 2.0-4.0 min/mm, the heat preservation time is more than or equal to 60min, and the steel plate is taken out of the furnace and cooled by water; the tempering heat preservation temperature is 630-650 ℃, the heat preservation coefficient is 2.5-4.5 min/mm, the heat preservation time is more than or equal to 60min, and the steel plate is discharged from a furnace and cooled in air.
5. The method for producing the low-carbon steel plate with excellent low-temperature impact toughness property according to claim 4, wherein in the smelting process, the steel ladle is well baked, and the baking temperature is not less than 910 ℃; the tapping is not allowed to see slag, the tapping temperature is higher than 1610 ℃, and the tapping C is less than or equal to 0.10 percent.
6. The method for producing the low-carbon type steel plate with excellent low-temperature impact toughness and welding performance according to claim 4, wherein good argon blowing is guaranteed in the whole LF refining process, the maintaining time of refined white slag is more than or equal to 30min, the total LF refining time is more than or equal to 60min, the consumption of aluminum wires is 3 to 5 kg/t of steel, the consumption of lime is more than or equal to 18 kg/t of steel, the consumption of silicon iron is more than or equal to 2.5 kg/t of steel, the aluminum content in the process is more than or equal to 0.016%, the drossing aluminum is more than or equal to 0.021%, and the S is less than or equal to 0.005% after.
7. The production method of the low-carbon steel plate with excellent low-temperature impact toughness and welding performance according to claim 4, characterized in that in the VD vacuum refining process, the vacuum degree is less than or equal to 35Pa, the vacuum maintaining time is more than or equal to 25min, 1.5 to 3 kg of Ca-Fe wires per t of steel are added before vacuum, argon cannot be blown greatly during vacuum pumping, the argon flow is 270 to 330L/min, and the feeding of Al wires is not allowed after vacuum pumping.
8. The method for producing the low-carbon steel plate with excellent low-temperature impact toughness and welding performance according to claim 4, wherein the continuous casting process is carried out at a liquidus temperature of 1514-1530 ℃; the thickness of the continuous casting billet is 200-330 mm.
9. The method for producing the low-carbon steel plate with excellent low-temperature impact toughness and welding performance according to claim 4, wherein in the heating process, the maximum heating temperature is 1250 ℃, the temperature of a soaking section is 1225-1245 ℃, the holding time of the soaking section is not less than 70min, the heating time coefficient is not less than 10min/mm, and the thorough burning and uniform burning of the steel billet are ensured.
10. The method for producing the low-carbon steel plate with excellent low-temperature impact toughness and welding performance according to claim 4, wherein in the rolling process, the initial rolling temperature in the stage II is 900-920 ℃, the final rolling temperature is 780-880 ℃, and the water-cooling re-reddening temperature is 680-730 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115976424A (en) * | 2022-12-14 | 2023-04-18 | 南阳汉冶特钢有限公司 | DH40 crack arrest steel plate for ocean platform and production method thereof |
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| CN111020351A (en) * | 2019-12-12 | 2020-04-17 | 舞阳钢铁有限责任公司 | Low-carbon steel plate with excellent low-temperature impact toughness and welding performance and production method thereof |
| CN111020399A (en) * | 2019-12-12 | 2020-04-17 | 舞阳钢铁有限责任公司 | Normalized air-cooled steel plate with long-time die welding performance and production method thereof |
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| CN115976424A (en) * | 2022-12-14 | 2023-04-18 | 南阳汉冶特钢有限公司 | DH40 crack arrest steel plate for ocean platform and production method thereof |
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