CN112981127A - Electroslag remelting inhibition oxygenation method - Google Patents
Electroslag remelting inhibition oxygenation method Download PDFInfo
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- CN112981127A CN112981127A CN202110173324.5A CN202110173324A CN112981127A CN 112981127 A CN112981127 A CN 112981127A CN 202110173324 A CN202110173324 A CN 202110173324A CN 112981127 A CN112981127 A CN 112981127A
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- consumable electrode
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/06—Applying particulate materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Wood Science & Technology (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the technical field of electroslag remelting, in particular to an electroslag remelting oxygen increasing inhibition method. The method specifically comprises the following steps: 1) surface treatment of the consumable electrode: processing the surface of the consumable electrode by adopting a mechanical polishing processing mode to ensure that the surface roughness of the consumable electrode reaches 50-150 mu m; 2) the coating comprises the following components in percentage by weight: the coating material is prepared from corundum powder and aluminum powder according to the mass ratio of 1: 4-1: 6; 3) spraying modes and parameters: carrying out consumable electrode surface spraying treatment by adopting an electrostatic powder spraying process; 4) other operations are carried out according to the conventional oxygen increasing inhibiting process: the protection of inert gas is enhanced, and the contact between air and slag is blocked; and the added deoxidizer inhibits the oxygenation of slag and molten steel. The method has the advantages of simple process, safety, reliability, low cost and high efficiency, and can effectively inhibit the oxygenation of the electroslag remelting molten steel.
Description
Technical Field
The invention relates to the technical field of electroslag remelting, in particular to an electroslag remelting oxygen increasing inhibition method.
Background
Electroslag Remelting (ESR) is one of the main means of special metallurgy, belongs to the secondary refining technology, and is also called Electroslag refining. The electroslag remelting aims at removing harmful impurity elements and nonmetallic inclusions in metal, purifying the metal and obtaining a steel ingot with uniform and compact crystalline structure. The electroslag remelting steel has the characteristics of high purity, low sulfur content, less impurities, compact metallographic structure, uniform chemical components and the like, and is widely applied to important fields of aerospace, war industry, nuclear power, automobiles, petrochemical industry and the like. The electroslag remelting furnace has simple structure, low production cost, convenient operation and high metal yield, can produce round ingots, square ingots and flat ingots, even hollow ingots, and can also be used for small-sized steelmaking equipment to smelt and cast molten steel. However, the electroslag remelting process is generally carried out in the atmosphere, and the electroslag steel is far higher than vacuum-treated steel such as vacuum arc remelting steel in terms of the oxygen content in the steel.
Whether dissolved oxygen or combined oxygen, they can cause a series of hazards to molten steel or solid steel: 1) the dissolved oxygen in the molten steel can oxidize the added alloy elements, such as aluminum, boron, zirconium, rare earth and the like, to lose effectiveness, and meanwhile, endogenous ground nonmetal and impurities can be generated; in the process of solidification of molten steel, the oxygen solubility is reduced along with the reduction of temperature, and the separated oxygen reacts with carbon to form carbon monoxide bubbles, so that steel ingots and castings are blown up to cause scrapping; oxygen precipitated in the form of FeO in the solidification process can form an eutectic with FeS, the melting point of which is 940 ℃, and the oxygen is precipitated along the grain boundary to cause hot cracks during steel ingot hot working. 2) After the molten steel is solidified, most of dissolved oxygen is converted into non-metallic inclusions which exist in the steel, and the non-metallic inclusions cause great harm to the processing performance and the service performance of the steel.
CN201910585148.9 discloses 'an oxygen control slag system of an electroslag furnace and a preparation method thereof', which provides an oxygen control slag system of an electroslag furnace, comprising the following components in percentage by weight: 30-32% of self-made pre-melted slag and Al2O3 43～45％、CaO2022 percent and 3 to 5 percent of MgO, wherein the content of SiO2 in the self-made pre-melted slag is less than or equal to 1.5 percent through desiliconization treatment, and the self-made pre-melted slag also contains 2 to 3 percent of aluminum, so that a better deoxidation effect can be achieved; CaO, Al2O3And MgO can further improve the deoxidation capability of the slag system. The oxygen-controlled slag system of the electroslag furnace has the advantages of low cost, simple preparation process, good energy-saving and consumption-reducing effects and stable remelting chemical components. The oxygen control slag system is utilized to smelt steel, so that the internal quality of an electroslag steel ingot is uniform, the surface of the cast ingot is smooth, and the flaw detection index is excellent. This patent is through in the premelting slag, and the aluminium of adding 2 ~ 3% deoxidier can carry out deoxidation treatment to oxygen in getting into the sediment, plays better protection effect, nevertheless to getting into oxygen in the molten steel by the slag, and its effect is limited, simultaneously, changes the slag component after the deoxidation, has certain influence to product quality.
CN201320644146.0 discloses a dry gas protection device for a slab electroslag furnace, which comprises a box-type gas-collecting hood and a dry gas input pipeline, wherein the box-type gas-collecting hood is arranged on a high-temperature slag pool of a crystallizer, and the top of the box-type gas-collecting hood is provided with an electrode hole; the dry gas input pipeline is fixed inside the box-type gas collecting hood, and a gas inlet of the dry gas input pipeline is connected with a dry gas source. The utility model discloses set up box gas collecting channel on the high temperature slag bath of slab electroslag furnace to utilize dry gas input pipeline to fill into dry gas in the box gas collecting channel, utilize dry gas to stop high temperature slag bath and air contact, thereby effectively prevented the emergence of high temperature slag bath hydrogen increase, oxygenation phenomenon, improved the product quality of slab electroslag steel. The patent separates air and slag through a physical method, can effectively prevent the slag from increasing oxygen, but cannot effectively control the oxygen increase of a steel sample caused by oxides in the slag.
In short, in the prior art, the oxygen increasing in the electroslag remelting process is inhibited by adopting measures of blocking air, changing slag components and the like, but the oxygen increasing of molten steel caused by slag oxides cannot be effectively inhibited.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the method for inhibiting oxygen increasing in electroslag remelting, which has the advantages of simple process, safety, reliability, low cost and high efficiency, and can effectively inhibit oxygen increasing in electroslag remelting molten steel.
In order to achieve the purpose, the invention adopts the following technical scheme:
an electroslag remelting oxygen increase inhibition method specifically comprises the following steps:
1) surface treatment of the consumable electrode: the method comprises the following steps of (1) treating residual oil stains, iron scales and the like on the surface of the consumable electrode by adopting treatment modes such as shot blasting, sand blasting and the like: the treatment time is 30-60 min; the surface roughness is 50 to 150 μm.
2) The coating comprises the following components in percentage by weight: the coating material adopts corundum powder, aluminum powder and corundum powder Al2O3The mass percentage content is more than or equal to 95 percent, and the granularity is 100-300 meshes; the mass percentage content of Al in the metal aluminum powder is more than or equal to 98 percent, and the granularity is 100-300 meshes; according to the mass ratio of 1: 4-1: 6, corundum powder: and (4) preparing metal aluminum powder.
3) Spraying modes and parameters: carrying out surface spraying treatment on the consumable electrode by adopting an electrostatic powder spraying process, wherein the thickness of the coating is 10-40 mu m;
4) other operations are carried out according to the conventional oxygen increasing inhibiting process: the protection of inert gas is enhanced, and the contact between air and slag is blocked; and the added deoxidizer inhibits the oxygenation of slag and molten steel.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention effectively prevents the secondary oxidation of the consumable electrode in the electroslag remelting process by spraying the surface of the consumable electrode before the electroslag remelting smelting production, and the process method is simple, safe and reliable.
2) The coating contains deoxidizer aluminum powder, can effectively inhibit the oxygenation of molten steel, and realizes the inhibition of the oxygenation of the molten steel in the whole electroslag remelting process.
3) The coating contains the corundum powder, so that the contact between the consumable electrode and air can be effectively prevented, the secondary oxidation of the consumable electrode is prevented, and the secondary oxidation of the consumable electrode is inhibited in the whole electroslag remelting process.
4) The invention adopts the electrostatic powder spraying process to carry out the surface spraying treatment of the consumable electrode, the process method is simple and reliable, the coating is uniform and firm, and the consumable electrode can be protected in the whole process in the electroslag remelting process.
Detailed Description
The invention discloses an electroslag remelting inhibition oxygenation method. Those skilled in the art can modify the process parameters appropriately to achieve the desired results with reference to the disclosure herein. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
The electroslag remelting oxygen increasing inhibiting method includes the following steps:
1) surface treatment of the consumable electrode: the method comprises the following steps of (1) treating residual oil stains, iron scales and the like on the surface of the consumable electrode by adopting treatment modes such as shot blasting, sand blasting and the like: the treatment time is 30-60 min; the surface roughness is 50 to 150 μm.
2) The coating comprises the following components in percentage by weight: the coating material adopts corundum powder, aluminum powder and corundum powder Al2O3The mass percentage content is more than or equal to 95 percent, and the granularity is 100-300 meshes; the mass percentage content of Al in the metal aluminum powder is more than or equal to 98 percent, and the granularity is 100-300 meshes; according to the mass ratio of 14-1: 6 pairs of corundum powder: and (4) preparing metal aluminum powder.
3) Spraying modes and parameters: carrying out surface spraying treatment on the consumable electrode by adopting an electrostatic powder spraying process, wherein the thickness of the coating is 10-40 mu m;
4) other operations are carried out according to the conventional oxygen increasing inhibiting process: the protection of inert gas is enhanced, and the contact between air and slag is blocked; and the added deoxidizer inhibits the oxygenation of slag and molten steel.
[ example 1 ]
The electroslag remelting inhibition oxygenation test is carried out by adopting the method, and the residual oil stain, iron scale and the like on the surface of the consumable electrode are treated by adopting a shot blasting treatment mode: the treatment time was 30min and the surface roughness was 50 μm. The coating material adopts corundum powder, aluminum powder and corundum powder Al2O3The mass percentage content is 95 percent, and the granularity is 100 meshes; the Al content of the metal aluminum powder is 98 percent by mass, and the granularity is 100 meshes; according to the mass ratio of 1:4, the corundum powder: and (4) preparing metal aluminum powder. The surface of the consumable electrode is sprayed by adopting an electrostatic powder spraying process, and the thickness of the coating is 10 mu m. Other operations are carried out according to the conventional oxygen increasing inhibiting process.
[ example 2 ]
The electroslag remelting inhibition oxygenation test is carried out by adopting the method, and the residual oil stain, iron scale and the like on the surface of the consumable electrode are treated by adopting a shot blasting treatment mode: the treatment time was 45min and the surface roughness was 100 μm. The coating material adopts corundum powder, aluminum powder and corundum powder Al2O3The mass percentage content is 97 percent, and the granularity is 200 meshes; the Al content of the metal aluminum powder is 99 percent by mass, and the granularity is 200 meshes; according to the mass ratio of 1:5, the corundum powder: and (4) preparing metal aluminum powder. And (3) carrying out surface spraying treatment on the consumable electrode by adopting an electrostatic powder spraying process, wherein the thickness of the coating is 25 micrometers. Other operations are carried out according to the conventional oxygen increasing inhibiting process.
[ example 3 ]
The electroslag remelting inhibition oxygenation test is carried out by adopting the electroslag remelting inhibition oxygenation test method, and the residual oil stain, iron scale and the like on the surface of the consumable electrode are treated by adopting a sand blasting treatment mode: the treatment time is 60min, and the surface is roughThe degree was 150. mu.m. The coating material adopts corundum powder, aluminum powder and corundum powder Al2O3The mass percentage content is 99 percent, and the granularity is 300 meshes; the Al content of the metal aluminum powder is 99.5 percent by mass, and the granularity is 300 meshes; according to the mass ratio of 1:6, the corundum powder: and (4) preparing metal aluminum powder. The surface of the consumable electrode is sprayed by adopting an electrostatic powder spraying process, and the thickness of the coating is 40 mu m. Other operations are carried out according to the conventional oxygen increasing inhibiting process.
The invention effectively prevents the secondary oxidation of the consumable electrode in the electroslag remelting process by spraying the surface of the consumable electrode before the electroslag remelting smelting production, and the process method is simple, safe and reliable. The coating contains deoxidizer aluminum powder, can effectively inhibit the oxygenation of molten steel, and realizes the inhibition of the oxygenation of the molten steel in the whole electroslag remelting process. The coating contains the corundum powder, so that the contact between the consumable electrode and air can be effectively prevented, the secondary oxidation of the consumable electrode is prevented, and the secondary oxidation of the consumable electrode is inhibited in the whole electroslag remelting process. The invention adopts the electrostatic powder spraying process to carry out the surface spraying treatment of the consumable electrode, the process method is simple and reliable, the coating is uniform and firm, and the consumable electrode can be protected in the whole process in the electroslag remelting process.
[ implementation effects ]:
in a certain steel plant, a 40t electroslag furnace (non-atmosphere protection) is adopted for carrying out electroslag remelting production trial production of austenitic stainless steel, and the effect of inhibiting oxygenation in the electroslag remelting process is examined, which is specifically as follows:
when the electroslag remelting oxygen increasing inhibition production test is carried out, the oxygen increasing in the electroslag remelting process can be effectively inhibited. When the electroslag remelting smelting of austenitic stainless steel is carried out, 50ppm of oxygen is increased averagely by adopting a conventional process, the oxygen increasing rate is 238.10%, the average oxygen increasing rate is 3ppm, the oxygen increasing rate is 14.29%, and the oxygen increasing rate can be reduced by 223.81%.
In a word, the invention can effectively inhibit the oxygen increasing in the electroslag remelting process (non-atmosphere protection) and greatly improve the molten steel quality.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. An electroslag remelting oxygen increase inhibition method is characterized by specifically comprising the following steps:
1) surface treatment of the consumable electrode: processing the surface of the consumable electrode by adopting a mechanical polishing processing mode to ensure that the surface roughness of the consumable electrode reaches 50-150 mu m;
2) the coating comprises the following components in percentage by weight: the coating material is prepared from corundum powder and aluminum powder according to the mass ratio of 1: 4-1: 6;
3) spraying modes and parameters: carrying out consumable electrode surface spraying treatment by adopting an electrostatic powder spraying process;
4) other operations are carried out according to the conventional oxygen increasing inhibiting process: the protection of inert gas is enhanced, and the contact between air and slag is blocked; and the added deoxidizer inhibits the oxygenation of slag and molten steel.
2. The electroslag remelting inhibition oxygenation method according to claim 1, characterized in that in the step 1, oil stains and iron scales remained on the surface of the consumable electrode are treated by adopting a shot blasting, shot blasting or sand blasting treatment mode, and the treatment time is 30-60 min.
3. The electroslag remelting inhibition oxygen increasing method according to claim 1, wherein the corundum powder Al in the step 22O3The mass percentage content is more than or equal to 95 percent, and the granularity is 100-300 meshes; the Al content of the metal aluminum powder is more than or equal to 98 percent by mass, and the granularity is 100-300 meshes.
4. The electroslag remelting inhibition oxygen increasing method according to claim 1, wherein the thickness of the coating in step 3 is 10-40 μm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116121547A (en) * | 2023-02-06 | 2023-05-16 | 东北大学 | Method and device for reducing oxygen potential in remelting atmosphere and improving cleanliness of electroslag ingot |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1370721A (en) * | 1971-03-17 | 1974-10-16 | Inst Elektroswarki Patona | Method of electroslag remelting of consumable electrodes |
| CN105349732A (en) * | 2015-12-11 | 2016-02-24 | 攀钢集团成都钢钒有限公司 | Preparation method for low-oxigen low-inclusion P91 electroslag steel |
| CN109161696A (en) * | 2018-09-30 | 2019-01-08 | 重庆钢铁(集团)有限责任公司 | A kind of electroslag remelting slag and it is used for electroslag remelting Fe-Cr-Al alloy low-oxygen control method |
| CN109680120A (en) * | 2019-01-11 | 2019-04-26 | 辽宁科技大学 | The control method of steel ingot total oxygen content in a kind of esr process |
| CN110144468A (en) * | 2019-07-01 | 2019-08-20 | 建龙北满特殊钢有限责任公司 | A kind of electroslag furnace control oxygen slag system and preparation method thereof |
-
2021
- 2021-02-09 CN CN202110173324.5A patent/CN112981127A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1370721A (en) * | 1971-03-17 | 1974-10-16 | Inst Elektroswarki Patona | Method of electroslag remelting of consumable electrodes |
| CN105349732A (en) * | 2015-12-11 | 2016-02-24 | 攀钢集团成都钢钒有限公司 | Preparation method for low-oxigen low-inclusion P91 electroslag steel |
| CN109161696A (en) * | 2018-09-30 | 2019-01-08 | 重庆钢铁(集团)有限责任公司 | A kind of electroslag remelting slag and it is used for electroslag remelting Fe-Cr-Al alloy low-oxygen control method |
| CN109680120A (en) * | 2019-01-11 | 2019-04-26 | 辽宁科技大学 | The control method of steel ingot total oxygen content in a kind of esr process |
| CN110144468A (en) * | 2019-07-01 | 2019-08-20 | 建龙北满特殊钢有限责任公司 | A kind of electroslag furnace control oxygen slag system and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116121547A (en) * | 2023-02-06 | 2023-05-16 | 东北大学 | Method and device for reducing oxygen potential in remelting atmosphere and improving cleanliness of electroslag ingot |
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