CN111020351A - Low-carbon steel plate with excellent low-temperature impact toughness and welding performance and production method thereof - Google Patents
Low-carbon steel plate with excellent low-temperature impact toughness and welding performance and production method thereof Download PDFInfo
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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Abstract
The invention discloses a low-carbon steel plate with excellent low-temperature impact toughness and welding performance and a production method thereof, wherein the steel plate comprises the following chemical components in percentage by mass: c is less than or equal to 0.29 percent, Si: 0.15 to 0.40%, Mn: 0.85-1.20%, P is less than or equal to 0.01%, S is less than or equal to 0.003%, Ni: 0.10-0.40%, Cr: 0.10-0.30%, Cu: 0.10-0.40%, 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 the low-C and Ni, Cu and Cr added component design, meets the higher requirements of the market on low-temperature impact toughness and excellent welding performance low-carbon steel plates through normalizing (accelerated cooling) and tempering heat treatment processes, and realizes the upgrading and updating of the traditional products.
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 welding performance and a production method thereof.
Background
The steel type SA516Gr65(HIC) is traditional container steel, a common component system is a high-C low-Mn component system, the C content is 0.17-0.20%, the Mn content is 0.85-1.15%, 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 0.40% (CE = C + Mn/6+ (Cr + Mo + V)/5 + (Ni + Cu)/15, and the CE in the following text 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, and the higher quality requirement is met by using lower carbon content and carbon equivalent, so that old varieties are upgraded and replaced. The current process optimization idea mainly comprises the following steps: firstly, the content of C is reduced, the content of Mn is kept, and alloy 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 meanwhile, various performance indexes of the steel plate meet the standard requirements; the second heat treatment process is optimized, the original component design has high C content and high CE, the heat treatment process is normalizing, the low C and low CE component design is adopted, the original heat treatment process cannot meet the performance index of the steel plate, and the heat treatment process needs normalizing (accelerated cooling) + tempering.
Aiming at the characteristic of low yield and high tensile strength of SA516Gr65(HIC), the low-C and low-CE component design is adopted to meet the requirement of low-temperature impact toughness of the steel plate, the strength level of the steel plate is ensured through normalizing (accelerated cooling) and tempering heat treatment processes, and crystal grains are refined through the addition process of microalloy Ni, Cu and Cr elements. The requirements of excellent low-temperature impact toughness and excellent welding performance of the SA516Gr65(HIC) steel plate are met, and the method has important significance for upgrading and updating the traditional old products.
Disclosure of Invention
The invention aims to provide a low-carbon steel plate with excellent low-temperature impact toughness and welding performance and a production method thereof. The invention meets the requirement of low-temperature impact toughness of the steel plate by adopting low-C and low-CE component design, ensures the strength level of the steel plate by normalizing (accelerated cooling) and tempering heat treatment processes, refines crystal grains by the addition process of microalloy Ni, Cu and Cr elements, realizes the requirements of excellent low-temperature impact toughness and excellent welding performance of an SA516Gr65(HIC) 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 and welding performance comprises the following chemical components in percentage by mass: c is less than or equal to 0.29 percent, Si: 0.15 to 0.40%, Mn: 0.85-1.20%, P is less than or equal to 0.01%, S is less than or equal to 0.003%, Ni: 0.10-0.40%, Cr: 0.10-0.30%, Cu: 0.10 to 0.40%, 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 0.35 percent.
The steel plate has a delivery state of-50 ℃ and a transverse impact mean value of more than or equal to 200J; the steel plate delivery state performance: the yield strength is more than or equal to 240MPa, the tensile strength is 450-585 MPa, and the extension is more than or equal to 19%.
The invention also provides a production method of the low-carbon steel plate with excellent low-temperature impact toughness and welding 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 normalizing heat preservation temperature is 880-910 ℃, the heat preservation coefficient is 1.5-3.5 min/mm, the heat preservation time is more than or equal to 60min, and the cooling is accelerated; and tempering heat preservation temperature is 560-630 ℃, the heat preservation coefficient is 1.5-4.5 min/mm, the heat preservation time is more than or equal to 60min, and discharging from the furnace and air cooling.
In the smelting process, the steel ladle is well baked, and the baking temperature is more than or equal to 900 ℃; the slag is not allowed to appear during tapping, the tapping temperature is more than 1600 ℃, 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 55min, the consumption of aluminum wires is 3-5 kg/t steel, the consumption of lime is more than or equal to 17 kg/t steel, the consumption of deoxidizer ferrosilicon is more than or equal to 2 kg/t steel, the process aluminum content is more than or equal to 0.015%, the drossing aluminum is more than or equal to 0.020%, and the S after refining is less than or equal to 0.005.
According to the VD vacuum refining process, the vacuum degree is less than or equal to 40Pa, the vacuum maintaining time is more than or equal to 20min, 1-3 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 280-350L/min, and Al wire feeding is not allowed after vacuum.
In the continuous casting process, the liquidus temperature is 1530-1550 ℃; 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 the soaking section is 1220-1240 ℃, the heat preservation time of the soaking section is more than or equal to 60min, the heating time coefficient is more than or equal to 11min/mm, and the thorough burning and uniformity of the 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 720-750 DEG C
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 adding components of Ni, Cu and Cr, 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 monoxide) of the steel plate is less than or equal to 0.35 percent through the normalizing (accelerated cooling) and tempering heat treatment processes; the average value of transverse impact of the steel plate in the delivery state at-50 ℃ is more than or equal to 200J; the steel plate delivery state performance: the yield strength is more than or equal to 240MPa, the tensile strength is 450-585 MPa, and the extension is more than or equal to 19%. 2. The invention meets the higher requirements of the market on low-carbon steel plates with excellent low-temperature impact toughness and welding performance, and realizes the upgrading and updating of traditional products.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance of the embodiment has the thickness of 19mm, and the chemical composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance comprises the working procedures 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 920 ℃; not allowing tapping to see slag, wherein the tapping temperature is 1610 ℃, 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 white slag refining time is 32min, the total LF refining time is 58min, the consumption of aluminum wires is 3.4 kg/t steel, the consumption of lime is 20 kg/t steel, the consumption of deoxidizer ferrosilicon is 3 kg/t steel, the aluminum content in the process is 0.017%, the slagging aluminum is 0.023%, and the refining is finished S: 0.004%;
(3) VD vacuum refining: the vacuum degree is 38Pa, the vacuum maintaining time is 25min, 1.5 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 305L/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 1538 ℃;
(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 70min, the heating time coefficient is 12min/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 910 ℃, the final rolling temperature is 785 ℃, and the water-cooling re-reddening temperature is 735 ℃;
(7) a heat treatment process: normalizing, keeping the temperature at 880 ℃, keeping the temperature coefficient at 1.5min/mm, keeping the temperature for 62min, and accelerating cooling; the tempering heat preservation temperature is 635 ℃, the heat preservation coefficient is 1.5min/mm, the heat preservation time is 67min, and the steel plate is discharged from the furnace and cooled in air.
The in-delivery performance indexes of the low carbon type steel sheet SA516Gr65(HIC) of this example, which is excellent in low temperature impact toughness and weldability, are shown in Table 2.
Example 2
The low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance of the embodiment has the thickness of 24mm, and the chemical composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance comprises the working procedures 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 ℃; the tapping is not allowed to see slag, the tapping temperature is 1650 ℃, and the tapping C: 0.09%;
(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 60min, the consumption of aluminum wires is 4.0 kg/t steel, the consumption of lime is 22 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.5 kg/t steel, the aluminum content in the process is 0.019%, the slagging aluminum is 0.025%, and the refining is finished S: 0.002%;
(3) VD vacuum refining: the vacuum degree is 39Pa, the vacuum maintaining time is 23min, 2.1 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 310L/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 1534 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1230 ℃, the heat preservation time of the soaking section is 66min, the heating time coefficient is 14min/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 915 ℃, the final rolling temperature is 850 ℃, and the water-cooling re-reddening temperature is 725 ℃;
(7) a heat treatment process: normalizing heat preservation temperature 890 ℃, heat preservation coefficient 2.0min/mm, heat preservation time 65min, accelerated cooling; the tempering heat preservation temperature is 635 ℃, the heat preservation coefficient is 2.0min/mm, the heat preservation time is 63min, and the steel plate is discharged from a furnace and cooled in air.
The in-delivery performance indexes of the low carbon type steel sheet SA516Gr65(HIC) of this example, which is excellent in low temperature impact toughness and weldability, are shown in Table 2.
Example 3
The low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance of the embodiment has the thickness of 30mm, and the chemical composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance comprises the working procedures 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 1630 ℃, and the tapping temperature is as follows: 0.06 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 33min, the total time of LF refining is 57min, the consumption of aluminum wires is 3.5 kg/t steel, the consumption of lime is 19 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.3 kg/t steel, the aluminum content in the process is 0.016%, the slagging aluminum is 0.021%, and the refining is finished S: 0.003%;
(3) VD vacuum refining: the vacuum degree is 36Pa, the vacuum maintaining time is 21min, 2.5 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 290L/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 63min, the heating time coefficient is 13min/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 900 ℃, the final rolling temperature is 800 ℃, and the water cooling re-reddening temperature is 745 ℃;
(7) a heat treatment process: normalizing, keeping the temperature at 885 deg.C, keeping the temperature coefficient at 1.8min/mm, keeping the temperature for 64min, and accelerating cooling; the tempering heat preservation temperature is 635 ℃, the heat preservation coefficient is 2.5min/mm, the heat preservation time is 65min, and the steel plate is discharged from the furnace and cooled in air.
The in-delivery performance indexes of the low carbon type steel sheet SA516Gr65(HIC) of this example, which is excellent in low temperature impact toughness and weldability, are shown in Table 2.
Example 4
The low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance of the embodiment has the thickness of 36mm, and the chemical composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance comprises the working procedures 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 ℃; not allowing tapping to see slag, wherein the tapping temperature is 1620 ℃, and the tapping C: 0.05 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the refining white slag keeping time is 38min, the LF refining total time is 62min, the consumption of aluminum wires is 4.5 kg/t steel, the consumption of lime is 21 kg/t steel, the consumption of deoxidizer ferrosilicon is 2.8 kg/t steel, the aluminum content in the process is 0.018%, the slagging aluminum is 0.027%, and the refining is finished S: 0.004%;
(3) VD vacuum refining: the vacuum degree is 35Pa, the vacuum maintaining time is 27min, 2.7 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 285L/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 1545 ℃;
(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 64min, the heating time coefficient is 12.5min/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 900 ℃, the final rolling temperature is 790 ℃, and the water cooling and red returning temperature is 730 ℃;
(7) a heat treatment process: normalizing, keeping the temperature at 910 ℃, keeping the temperature coefficient at 2min/mm, keeping the temperature for 68min, and accelerating cooling; the tempering heat preservation temperature is 635 ℃, the heat preservation coefficient is 3.0min/mm, the heat preservation time is 70min, and the steel plate is discharged from a furnace and cooled in air.
The in-delivery performance indexes of the low carbon type steel sheet SA516Gr65(HIC) of this example, which is excellent in low temperature impact toughness and weldability, are shown in Table 2.
Example 5
The low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance of the embodiment has the thickness of 40mm, and the chemical composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance comprises the working procedures 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 950 ℃; and (3) not allowing tapping to see slag, wherein the tapping temperature is 1625 ℃, 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 maintaining time of refined white slag is 36min, the total time of LF refining is 56min, the consumption of aluminum wires is 3.5 kg/t steel, the consumption of lime is 18 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 0.024%, and the refining is finished S: 0.002%;
(3) VD vacuum refining: the vacuum degree is 36Pa, the vacuum maintaining time is 22min, 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 310L/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 1539 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1228 ℃, the heat preservation time of the soaking section is 65min, the heating time coefficient is 13.5min/mm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: in stage II, the initial rolling temperature is 900 ℃, the final rolling temperature is 780 ℃, and the water cooling and red returning temperature is 740 ℃;
(7) a heat treatment process: normalizing, keeping the temperature at 900 ℃, keeping the heat preservation coefficient at 2.8min/mm, keeping the temperature for 70min, and accelerating cooling; the tempering heat preservation temperature is 630 ℃, the heat preservation coefficient is 3.0min/mm, the heat preservation time is 66min, and the steel plate is discharged from the furnace and cooled in air.
The in-delivery performance indexes of the low carbon type steel sheet SA516Gr65(HIC) of this example, which is excellent in low temperature impact toughness and weldability, are shown in Table 2.
Example 6
The low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance of the embodiment has the thickness of 44mm, and the chemical composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance comprises the working procedures 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 925 ℃; and (3) not allowing tapping to see slag, wherein the tapping temperature is 1645 ℃, and the tapping temperature is as follows: 0.06 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 time of LF refining is 59min, the consumption of aluminum wires is 3.4 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 0.021%, the slagging aluminum is 0.026%, and the refining is finished S: 0.003%;
(3) VD vacuum refining: the vacuum degree is 35Pa, the vacuum maintaining time is 24min, 3.0 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 1534 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1232 ℃, the heat preservation time of the soaking section is 68min, 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 in the stage II is 920 ℃, the final rolling temperature is 880 ℃, and the water cooling temperature is 735 ℃;
(7) a heat treatment process: normalizing, keeping the temperature at 890 ℃, keeping the temperature coefficient at 2min/mm, keeping the temperature for 63min, and accelerating cooling; the tempering heat preservation temperature is 630 ℃, the heat preservation coefficient is 2.3min/mm, the heat preservation time is 62min, and the steel plate is discharged from the furnace and cooled in air.
The in-delivery performance indexes of the low carbon type steel sheet SA516Gr65(HIC) of this example, which is excellent in low temperature impact toughness and weldability, are shown in Table 2.
Example 7
The low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance of the embodiment has the thickness of 50mm, and the chemical composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance comprises the working procedures 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 ℃; not allowing tapping to see slag, wherein the tapping temperature is 1605 ℃, and the tapping temperature is 1605 ℃, the tapping temperature is: 0.07 percent;
(2) an LF refining procedure: the argon blowing is ensured to be good in the whole process, the white slag refining time is 30min, the LF refining total time is 61min, the consumption of aluminum wires is 3.0 kg/t steel, the consumption of lime is 23 kg/t steel, the consumption of deoxidizer ferrosilicon is 2 kg/t steel, the aluminum content in the process is 0.018%, the slagging aluminum is 0.020%, and the refining is finished S: 0.001 percent;
(3) VD vacuum refining: the vacuum degree is 36Pa, the vacuum maintaining time is 20min, 2.5 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 300mm, and the liquidus temperature is 1537 ℃;
(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 62min, the heating time coefficient is 11min/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 850 ℃, and the water cooling temperature of re-reddening is 750 ℃;
(7) a heat treatment process: normalizing, keeping the temperature at 890 ℃, keeping the temperature coefficient at 2.5min/mm, keeping the temperature for 60min, and accelerating cooling; the tempering heat preservation temperature is 630 ℃, the heat preservation coefficient is 3.5min/mm, the heat preservation time is 64min, and the steel plate is discharged from the furnace and cooled in air.
The in-delivery performance indexes of the low carbon type steel sheet SA516Gr65(HIC) of this example, which is excellent in low temperature impact toughness and weldability, are shown in Table 2.
Example 8
The low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance of the embodiment has the thickness of 60mm, and the chemical composition and the mass percentage content thereof are shown in Table 1.
The production method of the low-carbon steel plate SA516Gr65(HIC) with excellent low-temperature impact toughness and welding performance comprises the working procedures 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 ℃; not allowing tapping to see slag, wherein the tapping temperature is 1615 ℃, and the tapping temperature is as follows: 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 37min, the total LF refining time is 55min, the consumption of aluminum wires is 5.0 kg/t steel, the consumption of lime is 17 kg/t steel, the consumption of deoxidizer ferrosilicon is 3.5 kg/t steel, the aluminum content in the process is 0.015%, the slagging aluminum is 0.022%, and the refining is finished S: 0.005 percent;
(3) VD vacuum refining: the vacuum degree is 34Pa, the vacuum maintaining time is 26min, 1.8 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 350L/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 1540 ℃;
(5) a heating procedure: the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1220 ℃, the heat preservation time of the soaking section is 60min, the heating time coefficient is 14.5min/mm, and the thorough burning and uniformity of the steel billet are ensured;
(6) a heating procedure: II, the initial rolling temperature is 915 ℃, the final rolling temperature is 830 ℃, and the water cooling and red returning temperature is 720 ℃;
(7) a heat treatment process: normalizing, keeping the temperature at 900 ℃, keeping the temperature coefficient at 3.5min/mm, keeping the temperature for 61min, and accelerating cooling; the tempering heat preservation temperature is 630 ℃, the heat preservation coefficient is 4.5min/mm, the heat preservation time is 60min, and the steel plate is discharged from the furnace and cooled in air.
The in-delivery performance indexes of the low carbon type steel sheet SA516Gr65(HIC) of this example, which is excellent in low temperature impact toughness and weldability, are shown in Table 2.
Table 1 chemical composition and mass% of steel sheets of examples 1 to 8
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 and welding performance is characterized by comprising the following chemical components in percentage by mass: c is less than or equal to 0.29 percent, Si: 0.15 to 0.40%, Mn: 0.85-1.20%, P is less than or equal to 0.01%, S is less than or equal to 0.003%, Ni: 0.10-0.40%, Cr: 0.10-0.30%, Cu: 0.10 to 0.40%, and the balance of Fe and inevitable impurities.
2. The low carbon type steel sheet excellent in low temperature impact toughness and weldability according to claim 1, wherein said steel sheet has a thickness specification of 8 to 60 mm; CE of the steel plate is less than or equal to 0.35 percent.
3. The low-carbon steel plate with excellent low-temperature impact toughness and welding performance as claimed in claim 1, wherein the steel plate is delivered in a state that the average value of transverse impact at-50 ℃ is not less than 200J; the steel plate delivery state performance: the yield strength is more than or equal to 240MPa, the tensile strength is 450-585 MPa, and the extension is more than or equal to 19%.
4. The method for producing a low carbon type steel plate excellent in low temperature impact toughness and weldability 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, heat treatment; in the heat treatment process, the normalizing heat preservation temperature is 880-910 ℃, the heat preservation coefficient is 1.5-3.5 min/mm, the heat preservation time is more than or equal to 60min, and the cooling is accelerated; and tempering heat preservation temperature is 560-630 ℃, the heat preservation coefficient is 1.5-4.5 min/mm, the heat preservation time is more than or equal to 60min, and discharging from the furnace and air cooling.
5. 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 smelting process, the steel ladle is well baked, and the baking temperature is not less than 900 ℃; the slag is not allowed to appear during tapping, the tapping temperature is more than 1600 ℃, and the tapping C is less than or equal to 0.10 percent.
6. The production method of the low-carbon type steel plate with excellent low-temperature impact toughness and welding performance according to claim 4, characterized in that 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 55min, the consumption of aluminum wires is 3 to 5 kg/t of steel, the consumption of lime is more than or equal to 17 kg/t of steel, the consumption of silicon iron is more than or equal to 2 kg/t of steel, the aluminum content in the process is more than or equal to 0.015%, the drossing aluminum is more than or equal to 0.020%, and the S after refining is less than or equal to 0.
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 40Pa, the vacuum maintaining time is more than or equal to 20min, 1 to 3 kg of Ca-Fe wires per t of steel are added before vacuum, argon cannot be blown greatly during vacuumizing, the argon flow is 280 to 350L/min, and the feeding of Al wires is not allowed after vacuum.
8. The method for producing a low carbon steel plate excellent in low temperature impact toughness and weldability according to any one of claims 4 to 7, characterized in that said continuous casting process has a liquidus temperature of 1530 to 1550 ℃; the thickness of the continuous casting billet is 200-330 mm.
9. The method for producing a low carbon type steel plate with excellent low temperature impact toughness and weldability according to any one of claims 4-7, characterized in that in the heating step, the maximum heating temperature is 1250 ℃, the temperature of the soaking section is 1220-1240 ℃, the holding time of the soaking section is not less than 60min, the heating time coefficient is not less than 11min/mm, and the thorough burning and uniform burning of the steel billet is ensured.
10. The method for producing the low-carbon steel plate with excellent low-temperature impact toughness and welding performance according to any one of claims 4 to 7, wherein the heating process is performed at a start rolling temperature of 900 to 920 ℃, a finish rolling temperature of 780 to 880 ℃ and a water-cooling re-reddening temperature of 720 to 750 ℃ in the stage II.
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