CN114619007B - Production method of low-alloy high-nitrogen steel continuous casting blank - Google Patents
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 73
- 239000010959 steel Substances 0.000 title claims abstract description 73
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 48
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 31
- 239000000956 alloy Substances 0.000 title claims abstract description 31
- 238000009749 continuous casting Methods 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000005266 casting Methods 0.000 claims abstract description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 238000010583 slow cooling Methods 0.000 claims abstract description 30
- 238000009826 distribution Methods 0.000 claims abstract description 11
- 230000004907 flux Effects 0.000 claims description 10
- 239000000498 cooling water Substances 0.000 claims description 9
- 229910052720 vanadium Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011449 brick Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 238000005457 optimization Methods 0.000 abstract description 2
- 239000000843 powder Substances 0.000 abstract 2
- 238000000034 method Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000007689 inspection Methods 0.000 description 4
- 239000013589 supplement Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 239000002667 nucleating agent Substances 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
Classifications
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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
-
- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
-
- 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
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a production method of a low-alloy high-nitrogen steel continuous casting blank, which comprises the following steps: the crystallizer is used for dynamically distributing water when casting low-alloy high-nitrogen steel; the crystallizer casting powder uses high-viscosity casting powder; optimizing casting technological parameters during casting of the low-alloy high-nitrogen steel, including optimization of molten steel superheat degree, drawing speed and cold water quantity; and immediately placing the cut casting blank into a slow cooling area for slow cooling. The invention aims to provide a production method of a low-alloy high-nitrogen steel continuous casting blank, which optimizes casting parameters of a casting process by using a crystallizer for dynamic water distribution, obtains a casting blank with good surface quality when casting low-alloy high-nitrogen steel, and enhances the market competitiveness of the product.
Description
Technical Field
The invention relates to a production method of a low-alloy high-nitrogen steel continuous casting blank.
Background
Nitrogen is generally considered as one of the harmful impurities in steel, and although the solubility of nitrogen in liquid molten steel is low at normal pressure, such small amounts of nitrogen can cause effective embrittlement of steel, so various secondary refining techniques for reducing nitrogen in liquid steel have been developed and are continuously improved. However, nitrogen as an alloying element in high nitrogen steels can interact with other alloying elements in the steel (e.g., mn, cr, V, nb, ti, etc.), giving the steel a number of excellent properties. For example, the stability of austenite is improved, the mechanical properties of steel are greatly improved, the corrosion resistance of steel is improved, and so on, so that nitrogen element is required to be added to some special-performance steel.
Although nitrogen can be added to steel for many benefits, nitrides of metallic elements such as aluminum, niobium, titanium and the like precipitate along austenite grain boundaries during continuous casting, reducing the thermoplasticity of the steel, and resulting in increased crack sensitivity of the continuous casting slab. Most steel grades require that the nitrogen content in the steel is not more than 0.005 percent (by mass percent), and practice proves that when the nitrogen content in the steel is more than 0.01 percent, the surface quality of a casting blank is difficult to control, cracks are serious, and the casting blank needs to be subjected to flame cleaning and even is directly scrapped.
The Chinese patent with application number 202110531537.0 discloses a surface quality control method of vanadium-containing high-nitrogen round steel, which comprises the steps of carrying out crack sensitive temperature interval test before continuous casting billet heating, designing a continuous casting billet preheating system according to a measurement result, and matching with a continuous casting billet and a rolled round steel slow cooling process to finally obtain the round steel with the surface magnetic flux leakage initial inspection qualification rate reaching more than 85%. This document is only directed to vanadium-containing round steels and mainly takes measures when heating before casting, but does not describe in detail how a good surface quality of the cast slab is obtained by optimizing the casting process.
The invention disclosed in the Chinese patent with application number 201910456810.0 is a slab continuous casting process of high-molybdenum high-chromium high-nitrogen steel and a slab, and the invention disclosed in the document is characterized in that a nucleating agent is added into a crystallizer when casting the high-molybdenum high-chromium high-nitrogen steel to promote the generation of equiaxed crystals on the wall of the crystallizer, and the prepared slab has good surface and center quality, is not easy to generate nitrogen segregation and precipitation phenomena, and has high production efficiency. However, the method described in this document requires the addition of a nucleating agent, which is not suitable for most steel grades and may affect the properties of the steel.
The Chinese patent with application number 202010257694.2 discloses ultralow-sulfur low-aluminum high-nitrogen steel and a smelting method, wherein nitrogen content is stabilized at 0.010-0.015% through converter smelting, desulfurization and RH vacuum treatment, no nitrogen-containing alloy is added, secondary pollution of impurities contained in the nitrogen-containing alloy to molten steel is avoided, molten steel cleanliness is improved, and steel quality is improved. However, this document does not describe how to obtain a strand with good surface quality by casting with a casting machine.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a production method of a low-alloy high-nitrogen steel continuous casting billet, which optimizes the process casting parameters of a casting machine by using a crystallizer for dynamic water distribution, obtains a casting billet with good surface quality when casting the low-alloy high-nitrogen steel, and enhances the market competitiveness of the product.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a production method of a low-alloy high-nitrogen steel continuous casting blank, which comprises the following steps:
(1) Dynamic water distribution using crystallizer when casting low alloy high nitrogen steel
The wide side water quantity of the crystallizer is 4800L/min, and the narrow side water quantity of the crystallizer is 390L/min;
the wide side casting heat flow of the crystallizer is set to be 1100-1400KW/m 2 The casting heat flow is lower than 1100KW/m 2 When the water quantity of the crystallizer is increased by 200L/min; the heat flow is higher than 1400KW/m 2 When the water quantity of the crystallizer is automatically reduced by 200L/min;
(2) High viscosity mold flux is used for mold flux
The Sidobby 34S-PA1-PE protective slag is used, the viscosity of the protective slag is 1.89Pa.s, and the melting point is 1217 ℃;
(3) Optimizing casting technological parameters during casting of low-alloy high-nitrogen steel, including optimization of molten steel superheat degree, drawing speed and secondary cooling water quantity
The superheat degree of the molten steel is ensured to be between 20 and 30 ℃; the pulling speed is stabilized at 0.7-0.9m/min, preferably 0.8m/min; the specific water quantity of the secondary cooling water is 0.6L/kg of steel;
(4) Immediately placing the cut casting blank into a slow cooling zone for slow cooling
The plate blanks which are taken down are concentrated in a slow cooling area, wherein the slow cooling area is formed by surrounding a place with good heat insulation performance of a blank warehouse by using refractory bricks to build walls, the height of the walls is 4 meters, and the hot blanks are concentrated in the slow cooling area, so that the temperature of the casting blanks can be reduced, and the internal stress is eliminated; and (5) placing each stack of blanks to the highest, intensively placing the stacks, and slowly cooling for more than 72 hours.
Further, the casting section was 2200X 300mm.
Further, the low-alloy high-nitrogen steel comprises the following components in percentage by mass:
0.14 to 0.16 percent of C, 0.17 to 0.27 percent of Si, 1.2 to 1.3 percent of Mn, 0 to 0.020 percent of P, 0 to 0.010 percent of S, 0.017 to 0.030 percent of Alt, 0.017 to 0.027 percent of Als, 0.06 to 0.08 percent of V, 0.001 to 0.0025 percent of Ca, 0.01 to 0.02 percent of N and the balance of Fe and unavoidable impurities.
Compared with the prior art, the invention has the beneficial technical effects that:
when the wide and thick plate is used for producing low-alloy high-nitrogen steel, the technical measures of dynamic water distribution, slow cooling and the like of a crystallizer are adopted during casting by a casting machine, so that the surface quality of a low-alloy high-nitrogen steel casting blank is obviously improved, and the occurrence rate of cracks on the surface of the casting blank is reduced from 100% to below 10% through a dye check inspection, thereby improving the competitiveness of the product.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments.
Example 1
The compositions of the low alloy high nitrogen steel are shown in table 1, and the following parameters are adopted during casting by a casting machine:
(1) The crystallizer uses dynamic water distribution. The wide side water quantity of the crystallizer is 4800L/min, and the narrow side water quantity of the crystallizer is 390L/min; the wide side casting heat flow of the crystallizer is set to be 1100-1400KW/m 2 The casting heat flow is lower than 1100KW/m 2 When the water quantity of the crystallizer is increased by 200L/min; the heat flow is higher than 1400KW/m 2 And automatically reducing the water quantity of the crystallizer by 200L/min.
The heat flow is continuously reduced to 1100KW/m due to the change of molten steel conditions, the water supplement of a crystallizer and the like in the casting process 2 When the water quantity of the crystallizer is automatically increased by 200L/min, namely from 4800L/min to 5000L/min, the heat flow of the crystallizer is recovered to 1100KW/m due to the increase of the water quantity of the crystallizer 2 The above.
(2) The schobeerg 34S-PA1-PE mold flux was used.
(3) The superheat degree is between 20 and 25 ℃, and the pulling speed is stabilized at 0.8m/min.
(4) The specific water content of the secondary cooling water is 0.6L/kg of steel.
(5) And (5) immediately placing the cut casting blank into a slow cooling area for slow cooling, and performing dye check to inspect the surface quality of the casting blank after slow cooling for 72 hours.
Example 2
The compositions of the low alloy high nitrogen steel are shown in table 1, and the following parameters are adopted during casting by a casting machine:
(1) The crystallizer uses dynamic water distribution. The wide side water quantity of the crystallizer is 4800L/min, and the narrow side water quantity of the crystallizer is 390L/min; the wide side casting heat flow of the crystallizer is set to be 1100-1400KW/m 2 The casting heat flow is lower than 1100KW/m 2 When the water quantity of the crystallizer is increased by 200L/min; the heat flow is higher than 1400KW/m 2 And automatically reducing the water quantity of the crystallizer by 200L/min.
In the casting process, the heat flow is continuously increased to 1400KW/m due to the change of molten steel conditions, water supplement of a crystallizer and the like 2 When the water quantity of the crystallizer is automatically reduced by 200L/min, namely from 4800L/min to 4600L/min, the heat flow of the crystallizer is recovered to 1400KW/m due to the fact that the water quantity of the crystallizer is small 2 The following is given.
(2) The schobeerg 34S-PA1-PE mold flux was used.
(3) The superheat degree is between 26 and 30 ℃, and the pulling speed is stabilized at 0.8m/min.
(4) The specific water content of the secondary cooling water is 0.6L/kg of steel.
(5) And (5) immediately placing the cut casting blank into a slow cooling area for slow cooling, and performing dye check to inspect the surface quality of the casting blank after slow cooling for 72 hours.
Example 3
The compositions of the low alloy high nitrogen steel are shown in table 1, and the following parameters are adopted during casting by a casting machine:
(1) The crystallizer uses dynamic water distribution. The wide side water quantity of the crystallizer is 4800L/min, and the narrow side water quantity of the crystallizer is 390L/min; the wide side casting heat flow of the crystallizer is set to be 1100-1400KW/m 2 The casting heat flow is lower than 1100KW/m 2 When the water quantity of the crystallizer is increased by 200L/min; the heat flow is higher than 1400KW/m 2 And automatically reducing the water quantity of the crystallizer by 200L/min.
The heat flow change in the casting process is stable and does not exceed 1100-1400KW/m 2 The amount of water in the crystallizer was kept at 4800L/min.
(2) The schobeerg 34S-PA1-PE mold flux was used.
(3) The superheat degree is between 22 and 28 ℃, and the pulling speed is stabilized at 0.8m/min.
(4) The specific water content of the secondary cooling water is 0.6L/kg of steel.
(5) And (5) immediately placing the cut casting blank into a slow cooling area for slow cooling, and performing dye check to inspect the surface quality of the casting blank after slow cooling for 72 hours.
Example 4
The compositions of the low alloy high nitrogen steel are shown in table 1, and the following parameters are adopted during casting by a casting machine:
(1) The crystallizer uses dynamic water distribution. The wide side water quantity of the crystallizer is 4800L/min, and the narrow side water quantity of the crystallizer is 390L/min; the wide side casting heat flow of the crystallizer is set to be 1100-1400KW/m 2 The casting heat flow is lower than 1100KW/m 2 When the water quantity of the crystallizer is increased by 200L/min; the heat flow is higher than 1400KW/m 2 And automatically reducing the water quantity of the crystallizer by 200L/min.
The heat flow is continuously reduced to 1100KW/m due to the change of molten steel conditions, the water supplement of a crystallizer and the like in the casting process 2 When the water quantity of the crystallizer is automatically increased by 200L/min, namely from 4800L/min to 5000L/min, the heat flow of the crystallizer is recovered to 1100KW/m due to the increase of the water quantity of the crystallizer 2 The above.
(2) The schobeerg 34S-PA1-PE mold flux was used.
(3) The superheat degree is between 26 and 30 ℃, and the pulling speed is stabilized at 0.8m/min.
(4) The specific water content of the secondary cooling water is 0.6L/kg of steel.
(5) And (5) immediately placing the cut casting blank into a slow cooling area for slow cooling, and performing dye check to inspect the surface quality of the casting blank after slow cooling for 72 hours.
Example 5
The compositions of the low alloy high nitrogen steel are shown in table 1, and the following parameters are adopted during casting by a casting machine:
(1) The crystallizer uses dynamic water distribution. The wide side water quantity of the crystallizer is 4800L/min, and the narrow side water quantity of the crystallizer is 390L/min; mold wide side casting heatThe flow is set between 1100KW/m and 1400KW/m 2 The casting heat flow is lower than 1100KW/m 2 When the water quantity of the crystallizer is increased by 200L/min; the heat flow is higher than 1400KW/m 2 And automatically reducing the water quantity of the crystallizer by 200L/min.
In the casting process, the heat flow is continuously increased to 1400KW/m due to the change of molten steel conditions, water supplement of a crystallizer and the like 2 When the water quantity of the crystallizer is automatically reduced by 200L/min, namely from 4800L/min to 4600L/min, the heat flow of the crystallizer is recovered to 1400KW/m due to the fact that the water quantity of the crystallizer is small 2 The following is given.
(2) The schobeerg 34S-PA1-PE mold flux was used.
(3) The superheat degree is between 20 and 25 ℃, and the pulling speed is stabilized at 0.8m/min.
(4) The specific water content of the secondary cooling water is 0.6L/kg of steel.
(5) And (5) immediately placing the cut casting blank into a slow cooling area for slow cooling, and performing dye check to inspect the surface quality of the casting blank after slow cooling for 72 hours.
Table 1 examples 1 to 5 chemical composition (in mass%)
Table 2 examples 1 to 5 results of surface dye check inspection
| Examples | Surface dye inspection results |
| 1 | No crack |
| 2 | No crack |
| 3 | No crack |
| 4 | No crack |
| 5 | No crack |
As can be seen from Table 2, the surface of the high-nitrogen steel casting blank prepared by the method has no crack, and the surface quality of the casting blank is effectively improved.
Therefore, when the low-alloy high-nitrogen steel is cast by the wide-thick plate casting machine, the technical measures of dynamic water distribution, slow cooling and the like of the crystallizer are adopted by optimizing the technological parameters, so that the surface quality of the low-alloy high-nitrogen steel casting blank is obviously improved, the flame cleaning amount and the scrapping amount of the casting blank are reduced, and the product competitiveness is improved.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (3)
1. The production method of the low-alloy high-nitrogen steel continuous casting blank is characterized by comprising the following steps of:
dynamic water distribution using crystallizer when casting low alloy high nitrogen steel
The wide side water quantity of the crystallizer is 4800L/min, and the narrow side water quantity of the crystallizer is 390L/min;
the wide side casting heat flow of the crystallizer is set to be 1100-1400KW/m 2 The casting heat flow is lower than 1100KW/m 2 When the crystallizer water quantity is fromDynamically adding water for 200L/min; the heat flow is higher than 1400KW/m 2 When the water quantity of the crystallizer is automatically reduced by 200L/min;
high viscosity mold flux is used for mold flux
The Sidobby 34S-PA1-PE protective slag is used, the viscosity of the protective slag is 1.89Pa.s, and the melting point is 1217 ℃;
optimizing casting technological parameters including superheat degree of molten steel during casting of low alloy high nitrogen steel,
Optimizing the pulling speed and the secondary cooling water quantity;
the superheat degree of the molten steel is ensured to be between 20 and 30 ℃; the pulling speed is stabilized at 0.7-0.9m/min; the specific water quantity of the secondary cooling water is 0.6L/kg of steel;
(4) Immediately placing the cut casting blank into a slow cooling zone for slow cooling
The plate blanks which are taken down are concentrated in a slow cooling area, wherein the slow cooling area is formed by surrounding a place with good heat insulation performance of a blank warehouse by using refractory bricks to build walls, the height of the walls is 4 meters, and the hot blanks are concentrated in the slow cooling area, so that the temperature of the casting blanks can be reduced, and the internal stress is eliminated; and (5) placing each stack of blanks to the highest, intensively placing the stacks, and slowly cooling for more than 72 hours.
2. The method for producing a low-alloy high-nitrogen steel continuous casting slab according to claim 1, wherein the casting section is 2200 x 300mm.
3. The production method of the low-alloy high-nitrogen steel continuous casting billet according to claim 1, wherein the low-alloy high-nitrogen steel comprises the following components in percentage by mass:
0.14 to 0.16 percent of C, 0.17 to 0.27 percent of Si, 1.2 to 1.3 percent of Mn, 0 to 0.020 percent of P, 0 to 0.010 percent of S, 0.017 to 0.030 percent of Alt, 0.017 to 0.027 percent of Als, 0.06 to 0.08 percent of V, 0.001 to 0.0025 percent of Ca, 0.01 to 0.02 percent of N and the balance of Fe and unavoidable impurities.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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