CN114015889A - Nitrogen-filled electroslag process for hollow billet cavity of nitrogen-containing steel - Google Patents
Nitrogen-filled electroslag process for hollow billet cavity of nitrogen-containing steel Download PDFInfo
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- CN114015889A CN114015889A CN202111217904.6A CN202111217904A CN114015889A CN 114015889 A CN114015889 A CN 114015889A CN 202111217904 A CN202111217904 A CN 202111217904A CN 114015889 A CN114015889 A CN 114015889A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 250
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 121
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 37
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000005275 alloying Methods 0.000 claims abstract description 14
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 238000003723 Smelting Methods 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 abstract description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 239000001257 hydrogen Substances 0.000 abstract description 2
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 abstract description 2
- 239000002436 steel type Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000014075 nitrogen utilization Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
-
- 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
- C22C38/02—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a nitrogen-charging electroslag process for a hollow billet cavity of nitrogen-containing steel, which is different from the common nitrogen-containing steel in that nitrogen element is added into an electrode billet and then electroslag is carried out, the process does not add nitrogen when the electrode billet is smelted, adopts a nitrogen-free hollow electrode billet, injects nitrogen gas into a reserved hole during electroslag, increases nitrogen into the steel by using the physicochemical reaction of the nitrogen gas and steel slag, controls the nitrogen flow according to the nitrogen content of different steel types, ensures that the alloying of the nitrogen element is completed in the remelting process of the electroslag, can be applied only on common electroslag equipment, does not need to be provided with a special pressurizing electroslag furnace with high price, greatly improves the shape of an electroslag molten pool due to the fact that a hot spot of the hollow billet is not positioned in the center of the molten pool, ensures that the molten pool tends to be in a more flat state, the consistency of the inner and outer crystalline states of an ingot is higher, and redundant nitrogen gas overflows from the periphery to form a protective atmosphere to avoid oxygen increasing and hydrogen increasing, not only can easily realize the alloying target of nitrogen element, but also can improve the quality of electroslag ingots.
Description
Technical Field
The invention belongs to the field of metallurgical process, and particularly relates to a nitrogen-filled electroslag process for a hollow billet cavity of nitrogen-containing steel, which can produce steel with the nitrogen content of 0.080% at most by using a nitrogen-free electrode billet, simplifies the production process of the nitrogen-containing steel electrode billet requiring electroslag, improves the efficiency, does not prolong the time of electroslag remelting, can reduce the production difficulty, reduces the cost consumption of the electrode billet and obtains higher production efficiency.
Background
At present, in the production process of nitrogen-containing steel requiring electroslag, nitrogen elements are added into steel during electrode blank smelting, and a pressurized nitrogen-charging electroslag production process is also used. Both of these processes have no advantages in terms of production efficiency and cost. The electrode blank nitrogen adding is generally to blow nitrogen gas or add azotized alloy in the steel, the nitrogen increasing speed is slow when the nitrogen gas is blown, the nitrogen gas is blown after VD, the long-time nitrogen blowing after VD can increase the power consumption and the corrosion of refractory materials, offset the degassing effect of VD, increase the gas and impurity content in the steel, and deteriorate the quality of the steel; the pressurized electroslag is adopted, a special sealed electroslag device is needed, the value of a single device of the pressurized electroslag device reaches 10 times that of the common electroslag device, the device is high in value, non-high value-added products cannot be economically produced, the pressurized electroslag device is only used for producing a few special products, and the popularization and application cannot be realized, so that the more simplified manufacturing process of the nitrogen-containing steel needing the electroslag needs to be developed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a manufacturing process of nitrogen-containing steel which is different from the prior art and needs electroslag, so as to improve the efficiency, reduce the cost and accurately control the alloying content of nitrogen in the steel.
The purpose of the invention is realized as follows: a nitrogen-filled electroslag process for a hollow billet cavity of nitrogen-containing steel is different from the common nitrogen-containing steel in that nitrogen is added into an electrode billet and then electroslag is carried out, the process does not add nitrogen when the electrode billet is smelted, a hollow electrode billet without nitrogen is adopted, nitrogen is injected into a reserved hole during electroslag, and the alloying of the nitrogen is completed in the remelting process of the electroslag, and the process comprises the following specific steps:
step 1), only adding other alloy elements except nitrogen elements during smelting of an electrode blank, pouring the electrode blank into a hollow blank or pouring a solid blank, and then punching by a machining or rolling mill to enable the hollow of the hollow blank and the punched hole to become an air inlet hole of the electrode blank, wherein the aperture of the air inlet hole is not smaller than 50mm, and then electroslag remelting under rotation;
step 2) before electroslag remelting, firstly manufacturing an electrode blank false electrode, and arranging a vent hole on the electrode blank false electrode to ensure that the vent hole of the electrode blank false electrode is communicated with an electrode blank gas inlet hole, wherein the aperture of the vent hole of the electrode blank false electrode is not less than 70mm, and the upper part of the vent hole is connected with a nitrogen pipeline;
step 3) installing an outer pipe on a vent hole of the electrode blank false electrode during electroslag remelting, introducing nitrogen on the outer pipe, wherein crystal water cannot exist, the nitrogen pressure is 1.0mmHg-1.5mmHg, the flow rate of the blown nitrogen is determined according to the nitrogen content in the steel, and the flow rate is 60 m/hour3-180m3When nitrogen is increased to the maximum, the mass percent of the nitrogen element content is 0.080 percent, and the flow rate is 60m3At the beginning, doThe nitrogen content in the steel corresponding to the flow is respectively as follows: 60-0.015%, 90-0.020%, 110-0.040%, 130-0.060%,150-0.070%, 180-0.080%, and the unit is hourly flow rate m3Mass percent nitrogen, nitrogen increase is slow below the minimum flow and above the maximum flow not only does not increase the nitrogen content but also produces porosity defects in the ingot.
In the step 2), when the electrode blank false electrode is welded with the electrode blank, the air vent of the electrode blank false electrode is ensured to be superposed with the central axis of the air inlet hole of the electrode blank, and the welding seam is sealed and does not leak air.
And (3) before step 3), namely before electroslag remelting and power transmission, starting to fill nitrogen into the hollow blank, and after remelting in step 3), filling the nitrogen to overflow from the periphery of the electrode blank and contact with liquid drops falling after the electrode blank is melted, wherein part of the nitrogen is dissolved into the liquid drops and is brought into a molten pool, and the nitrogen is crystallized and distributed in steel to complete alloying of nitrogen elements.
The invention has the following positive effects:
1. the invention directly manufactures the hollow blank without nitrogen, only injects nitrogen into the cavity of the blank when electroslag, greatly improves the production efficiency and quality assurance capability of the electrode blank, can be applied only on common electroslag equipment, does not need to configure a special pressurizing electroslag furnace with high price, greatly improves the shape of an electroslag molten pool because the hot point of the hollow blank is not at the center of the molten pool, leads the molten pool to be more in a flat state, leads the consistency of the inner and outer crystallization states of an ingot to be higher, simultaneously leads the redundant nitrogen to overflow from the periphery to form a protective atmosphere, avoids oxygen enrichment and hydrogen addition of molten steel, can easily realize the alloying target of nitrogen element, and improves the quality of the electroslag ingot.
2. Compared with available nitrogen containing steel needing electroslag, the present invention has the technological breakthrough of electroslag process incapable of being alloyed, high production efficiency, short electrode blank smelting period of 30 min, no added nitridized alloy, high nitrogen utilization rate and low production cost of 5%. And simultaneously reduces the emission of nitrogen. The alloying operation of nitrogen is simplified and controlled more accurately in the electroslag process, and the technical breakthrough that the alloying can not be carried out in the electroslag process is realized.
3. The process technology can more accurately control the mass percentage value of the nitrogen element in the steel, avoids the overflow fluctuation change of the nitrogen element in the post-furnace pouring process and the electroslag process when the electrode blank is manufactured by the prior process, and ensures that the element content is more stably controlled.
4. By adopting the nitrogen-filled electroslag process for the cavity of the hollow billet of the nitrogen-containing steel, the problem of alloying of nitrogen elements is not considered when the electrode billet is manufactured for the nitrogen-containing steel needing electroslag, and the hollow billet can be manufactured only by analyzing the nitrogen content of the electrode billet after smelting. When electroslag remelting is carried out, nitrogen is filled into the cavity, and the corresponding nitrogen flow is adjusted according to different nitrogen content requirements, so that electroslag steel with the required nitrogen content can be produced, and the effects of accurately controlling the element content, simplifying the production flow, shortening the process time and reducing the cost can be achieved.
Drawings
FIG. 1 is a schematic view of the operation of the electroslag process of the present invention.
In the figure, 1-a cross arm chuck 2-an electrode blank false electrode 3-a nitrogen pipeline 4-an electrode blank with an air inlet 5-a crystallizer 6-heavy molten slag 7-a crystal ingot 8-an ingot protecting plate 9-a short net 10-an upright post 11-a transmission screw rod.
Detailed Description
As shown in figure 1, the invention discloses a nitrogen-filled electroslag process for a hollow billet cavity of nitrogen-containing steel, which is different from the conventional process of adding nitrogen element into an electrode billet and electroslag, the process is characterized in that nitrogen is not added during smelting the electrode billet, a hollow electrode billet without nitrogen is adopted, nitrogen is injected from a reserved hole during electroslag, and alloying of the nitrogen element is completed in the remelting process of the electroslag. Other configurations of the apparatus and other operations in the process are not different from conventional electroslag remelting. The method comprises the following specific steps:
step 1), only adding other alloy elements except nitrogen elements during smelting of an electrode blank, pouring the electrode blank into a hollow blank or a solid blank, and then punching by a machining or rolling mill, so that the hollow of the hollow blank and the punched hole become an air inlet hole of the electrode blank, the aperture of the air inlet hole is not less than 50mm, the electrode blank becomes an electrode blank 4 with an air inlet hole, and then electroslag remelting is carried out downwards;
step 2) before electroslag remelting, firstly manufacturing an electrode blank false electrode 2, forming a vent hole on the electrode blank false electrode 2, ensuring that the vent hole of the electrode blank false electrode is communicated with an electrode blank air inlet hole, ensuring that the aperture of the vent hole of the electrode blank false electrode is not less than 70mm, and externally connecting the upper part of the vent hole with a nitrogen pipeline 3; the electrode blank false electrode 2 is movably arranged on the upright post 10 through the cross arm chuck 1, and the height of the electrode blank false electrode is realized by controlling the height of the cross arm chuck 1 on the upright post 10 through a transmission screw rod 11. A short net 9 is also arranged on the upright post 10;
step 3), in electroslag remelting, externally connecting a nitrogen pipeline 3 to a vent hole of a false electrode of an electrode blank, introducing nitrogen into the nitrogen pipeline 3, wherein crystal water cannot exist, the nitrogen pressure is 1.0mmHg-1.5mmHg, determining the flow of blown nitrogen according to the nitrogen content in steel, and the flow is 60 m/hour3-180m3When nitrogen is increased to the maximum, the mass percent of the nitrogen element content is 0.080 percent, and the flow rate is 60m3At the beginning, the nitrogen content in the steel corresponding to different flow rates is respectively as follows: 60-0.015%, 90-0.020%, 110-0.040%, 130-0.060%,150-0.070%, 180-0.080%, and the unit is hourly flow rate m3Mass percent nitrogen, nitrogen increase is slow below the minimum flow and above the maximum flow not only does not increase the nitrogen content but also produces porosity defects in the ingot.
In the figure, 5 is a crystallizer, 6 is heavy slag, 7 is a crystalline ingot, and 8 is an ingot protecting plate.
In the step 2), when the electrode blank false electrode 2 is welded with the electrode blank 4, the air vent of the electrode blank false electrode is ensured to coincide with the central axis of the air inlet of the electrode blank, and the welding seam is sealed and does not leak air.
And (3) before step 3), namely before electroslag remelting and power transmission, starting to fill nitrogen into the hollow blank, and after remelting in step 3), filling the nitrogen to overflow from the periphery of the electrode blank 4 and contact with liquid drops falling after the electrode blank is melted, wherein part of the nitrogen is dissolved into the liquid drops and is brought into a molten pool, and the nitrogen is crystallized and distributed in steel to complete alloying of nitrogen elements.
Example 1: taking a nitrogen-containing die steel P15 product needing electroslag as an example, the process design steps are as follows:
the chemical composition of die steel P15 is given in the following table (mass%):
the elements capable of fixing nitrogen in the components of the steel grade are mainly Cr and V, and the optimum nitrogen content of the nitrogen element in the steel grade is 0.070% (mass percent%) according to the calculation of a metallurgical formula.
The invention relates to a nitrogen-filled electroslag process for a hollow billet cavity of nitrogen-containing steel, which is different from the common nitrogen-containing steel in that nitrogen is added into an electrode billet and then electroslag is carried out, the process does not add nitrogen during electrode billet smelting, adopts a nitrogen-free hollow electrode billet, injects nitrogen into a reserved hole during electroslag, and leads the alloying of the nitrogen to be completed in the remelting process of the electroslag, and comprises the following specific steps:
step 1), manufacturing an electrode blank in a mode of 'smelting in an electric arc furnace (or smelting in a converter or an induction furnace) → LF refining → VD vacuum degassing → pouring', adding nitrogen elements to steel in a mode of blowing nitrogen or adding a nitriding alloy no longer, only adding other alloy elements except the nitrogen elements, and when the smelting is finished, pouring the electrode blank into a hollow blank or a solid blank, and after annealing, performing mechanical machining or rolling to perforate in a rolling mill to enable the hollow of the hollow blank and the perforation to become an air inlet hole of the electrode blank, wherein the aperture of the air inlet hole is not less than 50mm, and then performing electroslag down remelting;
step 2) before electroslag remelting, firstly manufacturing an electrode blank false electrode, and arranging a vent hole on the electrode blank false electrode to ensure that the vent hole of the electrode blank false electrode is communicated with an electrode blank gas inlet hole, wherein the aperture of the vent hole of the electrode blank false electrode is not less than 70mm, and the upper part of the vent hole is connected with a nitrogen pipeline; the hollow blank and the electrode blank false electrode are welded in an aligned mode before electroslag remelting, when the electrode blank false electrode is welded with the electrode blank, the fact that the air vent of the electrode blank false electrode is overlapped with the central axis of the air inlet hole of the electrode blank is guaranteed, the welding seam is sealed and air-tight, and the welding seam is completely sealed;
step 3) during electroslag remelting, installing an outer pipe on a vent hole of the false electrode of the electrode blank, namely, connecting a nitrogen pipe on the outer pipe of the false electrode after the electrode blank is installed in place, connecting nitrogen on the outer pipe, paying attention to the fact that the nitrogen cannot contain crystal water, starting the nitrogen, controlling the pressure to be 1.2mmHg, and controlling the flow to be 150 m/hour3And then, transmitting electricity to carry out electroslag remelting until the electroslag remelting is finished. When the flow rate is lower than the minimum flow rate, nitrogen is slowly increased, and when the flow rate is higher than the maximum flow rate, the nitrogen content cannot be increased, and air hole defects can be generated in the ingot.
Claims (3)
1. A nitrogen-charging electroslag process for a cavity of a nitrogen-containing steel hollow billet is characterized by comprising the following steps: different from the conventional process of adding nitrogen element into an electrode blank and electroslag, the process does not add nitrogen when the electrode blank is smelted, adopts a nitrogen-free hollow electrode blank, injects nitrogen gas into a reserved hole during electroslag, and enables the alloying of the nitrogen element to be completed in the remelting process of the electroslag, and comprises the following specific steps:
step 1), only adding other alloy elements except nitrogen elements during smelting of an electrode blank, pouring the electrode blank into a hollow blank or pouring a solid blank, and then punching by a machining or rolling mill to enable the hollow of the hollow blank and the punched hole to become an air inlet hole of the electrode blank, wherein the aperture of the air inlet hole is not smaller than 50mm, and then electroslag remelting under rotation;
step 2) before electroslag remelting, firstly manufacturing an electrode blank false electrode, and arranging a vent hole on the electrode blank false electrode to ensure that the vent hole of the electrode blank false electrode is communicated with an electrode blank gas inlet hole, wherein the aperture of the vent hole of the electrode blank false electrode is not less than 70mm, and the upper part of the vent hole is connected with a nitrogen pipeline;
step 3), installing a nitrogen pipeline on the air hole of the electrode blank false electrode during electroslag remelting, and connecting the nitrogen pipeline to the nitrogen pipelineNitrogen gas, no crystal water, nitrogen gas pressure of 1.0mmHg-1.5mmHg, flow rate of blowing nitrogen determined according to nitrogen content in steel, flow rate of 60m per hour3-180m3When nitrogen is increased to the maximum, the mass percent of the nitrogen element content is 0.080 percent, and the flow rate is 60m3At the beginning, the nitrogen content in the steel corresponding to different flow rates is respectively as follows: 60-0.015%, 90-0.020%, 110-0.040%, 130-0.060%,150-0.070%, 180-0.080%, and the unit is hourly flow rate m3Mass percent nitrogen, nitrogen increase is slow below the minimum flow and above the maximum flow not only does not increase the nitrogen content but also produces porosity defects in the ingot.
2. The nitrogen-filled electroslag process for the cavity of the hollow billet of the nitrogen-containing steel as claimed in claim 1, which is characterized in that: in the step 2), when the electrode blank false electrode is welded with the electrode blank, the air vent of the electrode blank false electrode is ensured to be superposed with the central axis of the air inlet hole of the electrode blank, and the welding seam is sealed and does not leak air.
3. The nitrogen-filled electroslag process for the cavity of the hollow billet of the nitrogen-containing steel as claimed in claim 1, which is characterized in that: and (3) before step 3), namely before electroslag remelting and power transmission, starting to fill nitrogen into the hollow blank, and after remelting in step 3), filling the nitrogen to overflow from the periphery of the electrode blank and contact with liquid drops falling after the electrode blank is melted, wherein part of the nitrogen is dissolved into the liquid drops and is brought into a molten pool, and the nitrogen is crystallized and distributed in steel to complete alloying of nitrogen elements.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116287744B (en) * | 2023-05-23 | 2023-08-29 | 苏州集萃高合材料科技有限公司 | Super-large-specification high-temperature alloy and preparation method thereof |
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