CN104087760A - Metal smelting method of large high-temperature alloy casting - Google Patents
Metal smelting method of large high-temperature alloy casting Download PDFInfo
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Abstract
The invention discloses a metal smelting method of a large high-temperature alloy casting, which is capable of producing multiple tons of molten steel meeting large high-temperature alloy casting requirements once. The smelting method comprises the following steps: (1) transforming equipment and confirming a formula of materials needed for the high-temperature alloy casting; (2) smelting a plurality of small steel ingots meeting the large high-temperature alloy casting requirements, wherein the total mass of the small steel ingots is 110%-120% that of the molten steel needed for the large high-temperature alloy casting; (3) removing regions with relatively poor quality from the small steel ingots, cutting into small pieces, and smelting in a large electrical furnace; (4) performing deoxidization, decarbonization and H and N removal on the molten steel obtained by smelting in a ladle refining furnace, and adjusting chemical components of the molten steel until the chemical components of the molten steel meet the large high-temperature alloy casting requirements; (5) performing pouring of the large high-temperature alloy casting on the molten steel. According to the smelting method, large-ton high-quality high-temperature alloy molten steel can be provided once and production of the large high-temperature alloy casting can be realized.
Description
Technical field
The present invention relates to a kind of smelting process of high-temperature alloy casting, especially a kind of large-sized high-temperature alloy foundry goods Metal smelting method.
Background technology
Known: superalloy has the features such as structure stability is good, hot strength is high, anti-oxidant, corrosion-resistant, is widely used in the departments such as aviation, the energy and chemical industry.But because superalloy alloying level is high, control of element narrow range, purity requires high, smelt difficulty very large, and along with the increase of required smelting superalloy tonnage, difficulty sharply increases.
Large-sized high-temperature alloy foundry goods net weight can reach 20 tons of left and right, needs a large amount of superalloy molten steel, but current superalloy smelting process, and as vacuum induction furnace+ladle refining furnace, or the method such as medium-frequency induction furnace+ladle refining furnace VOD is difficult to reach.Because the equipment capacities such as at present vacuum induction furnace, medium-frequency induction furnace are limited, and the reason such as involve great expense is only applicable to the smelting of a small amount of superalloy, cannot disposablely obtain the superalloy molten steel of several tonnes.Electric furnace+ladle refining furnace VOD is the main metallurgical method of current large-scale iron and steel class foundry goods, the molten steel of 800 tons of left and right can be disposablely provided at most, but due to chemical composition and comparatively difficulty of control of deleterious element, the reasons such as furnace melting furnace charge and ladle refining furnace (VOD decarburization) difficulty is large, cannot realize the direct smelting of a large amount of superalloys.The quality of superalloy molten steel has directly determined the quality of large-sized high-temperature alloy foundry goods, cannot disposablely obtain large-tonnage high quality superalloy molten steel and restricted the development of large-sized high-temperature alloy foundry goods.
In prior art, electric furnace+ladle refining furnace VOD is the main metallurgical method of current large-scale iron and steel class foundry goods, the molten steel of 800 tons of left and right can be disposablely provided at most, but due to chemical composition and comparatively difficulty of control of deleterious element, the reason such as the decarburization difficulty of furnace melting furnace charge and ladle refining furnace VOD is large, cannot realize the direct smelting of a large amount of superalloys.Described ladle refining furnace VOD refers to the ladle refining furnace of alloying constituent fine setting under oxygen blast under vacuum, decarburization, vacuum stripping, vacuum.Ladle refining furnace VOD is mainly used in refining Ultralow Carbon Stainless Steel and electrical pure iron etc.But large-sized high-temperature alloy foundry goods Metal smelting method of the present invention is by transforming common electroslag remelting furnace as the electroslag furnace with vacuum function, vacuum system to ladle refining furnace is upgraded, make the vacuum tightness of ladle refining furnace be less than oxygen blast, decarburization, the vacuum degassed ability that 66.7pa effectively improves electroslag furnace and ladle refining furnace, because carbon can form carbide gas at high temperature, therefore also improve the decarburization capacity of electroslag furnace and ladle refining furnace.First smelt into little steel ingot at the material of needs being smelted into large-sized high-temperature alloy foundry goods, in the time producing little steel ingot, carry out the control of chemical composition for the first time and the removal of detrimental impurity simultaneously.Thereby make the chemical composition of the material that need to smelt into large-sized high-temperature alloy foundry goods identical with the required chemical composition of large-sized high-temperature alloy foundry goods, make to smelt into harmful element, gaseous impurities and carbon content in the material of large-sized high-temperature alloy foundry goods all lower simultaneously.Therefore in step 4) in again carry out deoxidation, decarburization, go H, N to process, inspection molten steel chemical composition, and the steel quality obtaining after molten steel chemical composition being adjusted according to high-temperature alloy casting standard is higher.The synergy that the material of smelting into large-sized high-temperature alloy foundry goods by the technological transformation to equipment, to needs carries out the adjusting again to chemical composition and deoxidation, decarburization in little ingot smelting and step 4, go H, N to process makes the smelting process of the present invention can disposable acquisition large-tonnage high quality superalloy molten steel, realizes the production of large-sized high-temperature alloy foundry goods.
Fe content is below 5% when making to ensure that superalloy is smelted, step 1) in common electroslag remelting furnace is being transform as to the electroslag furnace with vacuum function, vacuum system to ladle refining furnace is upgraded, the vacuum tightness of ladle refining furnace is less than after 66.7pa, further comprising the steps of, adopt nickel to clean residual iron in ladle refining furnace and Large Electric Furnace stove.Thereby cleaning iron residual in ladle refining furnace and Large Electric Furnace stove by nickel can make residual iron block in ladle refining furnace and Large Electric Furnace stove be removed, avoid iron residual in stove in the time that ladle refining furnace and Large Electric Furnace are smelted, affect the content of the interior molten steel Fe of stove.
In order to reduce costs, smelt more fast little steel ingot, the little steel ingot simultaneously obtaining meets related request.Step 2) the middle multiple little steel ingots of vacuum consumable+electric slag refusion and smelting that adopt, described little steel ingot meets the requirement of large-sized high-temperature alloy foundry goods.Little steel ingot can adopt several different methods to obtain, such as vacuum consumable+esr, vacuum induction+esr etc.Adopt the smelting process of vacuum consumable+esr to smelt little steel ingot because vacuum consumable+electric slag refusion and smelting method employing vacuum is carried out deoxidation, carbon elimination, degassed to molten steel, therefore the gas content in molten steel is few, molten steel purity is high, can make the chemical composition purity of little steel ingot higher.
On little steel ingot, there is mass defect and oxidized part, step 3 in order to remove) in little surface of steel ingot is polished, remove little surface of steel ingot zone of oxidation.Can pass through mechanical workout removing while there is mass defect and oxidized part on little steel ingot, also can be by polishing.Because mechanical workout needs single-purpose machine, cost is higher, and therefore general employing polished, and reduces costs.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of large-sized high-temperature alloy foundry goods Metal smelting method, and this smelting process can disposable production number tonne meets the molten steel of large-sized high-temperature alloy foundry goods requirement.
The technical solution adopted for the present invention to solve the technical problems is: large-sized high-temperature alloy foundry goods Metal smelting method, comprises the following steps:
1) transform common electroslag remelting furnace the electroslag furnace with vacuum function as, the vacuum system of ladle refining furnace is upgraded, make the vacuum tightness of ladle refining furnace be less than 66.7pa; Determine the formula of high-temperature alloy casting casting material requested according to the empirical value of the scaling loss situation of the requirement of high-temperature alloy casting chemical composition and Steelmaking interalloy element;
2) high-temperature alloy casting is cast to material requested and smelted into multiple little steel ingots by electroslag remelting furnace, described little steel ingot meets the requirement of large high-temperature foundry goods; Little steel ingot total mass is 110%～120% of the required steel quality of large-sized high-temperature alloy foundry goods;
3) little steel ingot is carried out to chemical composition analysis, second-rate region, termination, little steel ingot two ends and surface oxide layer are removed, again little steel ingot is divided into and meets Large Electric Furnace and smelt the small powder to steel ingot lumpiness, specification of quality, put into Large Electric Furnace and smelt;
4) molten steel after Large Electric Furnace is smelted is poured in ladle refining furnace and is smelted, and by molten steel carry out deoxidation, decarburization, remove H, N processes, inspection molten steel chemical composition, and molten steel chemical composition being adjusted according to high-temperature alloy casting standard; Until molten steel chemical composition meets the requirement of large high-temperature foundry goods;
5) molten steel is carried out to the cast of large-sized high-temperature alloy foundry goods.
Further, in step 1) in common electroslag remelting furnace is being transform as to the electroslag furnace with vacuum function, vacuum system to ladle refining furnace is upgraded, the vacuum tightness of ladle refining furnace is less than after 66.7pa, further comprising the steps of, adopt nickel to clean residual iron in ladle refining furnace and Large Electric Furnace stove.
Preferably, step 2) the middle multiple little steel ingots of vacuum consumable+electric slag refusion and smelting that adopt.
Preferably, step 3) in polished in electroslag ingot surface, remove little surface of steel ingot zone of oxidation.
The invention has the beneficial effects as follows: large-sized high-temperature alloy foundry goods Metal smelting method of the present invention, in the time smelting the required molten steel of large-sized high-temperature alloy foundry goods, first smelt the little steel ingot that to meet large-sized high-temperature alloy foundry goods parameter and standard, then little steel ingot is smelted in Large Electric Furnace, and the molten steel obtaining is carried out to the adjusting of chemical composition, make the final disposable molten steel that obtains meeting large-sized high-temperature alloy foundry goods.Therefore improved the purity of metal, reduced sulphur content and non-metallic inclusion, this smelting process technique is simple, it is convenient to produce, and large-tonnage high quality superalloy molten steel can be disposablely provided, thereby realize the production of large-sized high-temperature alloy foundry goods.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
Large-sized high-temperature alloy foundry goods Metal smelting method, comprises the following steps:
1) transform common electroslag remelting furnace the electroslag furnace with vacuum function as, the vacuum system of ladle refining furnace is upgraded, make the vacuum tightness of ladle refining furnace be less than 66.7pa; Determine the formula of high-temperature alloy casting casting material requested according to the empirical value of the requirement of high-temperature alloy casting chemical composition and Steelmaking interalloy melting loss of elements situation;
2) high-temperature alloy casting is cast to material requested and smelted into multiple little steel ingots by electroslag remelting furnace, described little steel ingot meets the requirement of large-sized high-temperature alloy foundry goods, and little steel ingot total mass is 110%～120% of the required steel quality of large-sized high-temperature alloy foundry goods;
3) little steel ingot is carried out to chemical composition analysis, second-rate termination, little steel ingot two ends region is removed, less steel ingot is divided into and meets Large Electric Furnace and smelt the small powder to steel ingot lumpiness, specification of quality, put into Large Electric Furnace and smelt;
4) molten steel after Large Electric Furnace is smelted is poured in ladle refining furnace and is smelted, and by molten steel carry out deoxidation, decarburization, remove H, N processes, inspection molten steel chemical composition, and molten steel chemical composition being adjusted according to high-temperature alloy casting standard; Until molten steel chemical composition meets the requirement of large-sized high-temperature alloy foundry goods;
5) molten steel is carried out to the cast of large-sized high-temperature alloy foundry goods.
The equipment that large-sized high-temperature alloy foundry goods Metal smelting method of the present invention is mainly used comprises electroslag remelting furnace, ladle refining furnace and Large Electric Furnace.
In step 1) in electroslag remelting furnace is transformed, making electroslag remelting furnace is the electroslag furnace with vacuum function.Therefore can improve the degassed ability of electroslag remelting furnace, the H in the steel ingot forming, O, N can be reduced to lower level in electroslag furnace.The vacuum system of ladle refining furnace is upgraded, make the vacuum tightness of ladle refining furnace be less than 66.7pa.Low vacuum while making molten steel carry out further deoxidation carbon elimination processing in ladle refining furnace can form larger negative pressure in stove, by the gas sucking-off in molten steel, can ensure that C, H, O, N are reduced to lower level.
In step 1) in require and the empirical value of Steelmaking interalloy melting loss of elements situation is determined the formula of high-temperature alloy casting casting material requested according to high-temperature alloy casting chemical composition.Require to determine by high-temperature alloy casting chemical composition the chemical composition containing in smelting molten steel material requested; Model and the kind of the empirical value selection material by Steelmaking interalloy melting loss of elements situation, make the material interalloy element of selecting meet the scaling loss requirement in smelting process.
The empirical value of described Steelmaking interalloy melting loss of elements situation refers to according to knowhow adds up to the data of various alloying element scaling loss situations the scaling loss ratio obtaining in the smelting process of molten steel.Described alloying element scaling loss refers to the oxide compound that the oxygen generation oxidizing reaction in alloying element and atmosphere, molten steel and slag generates, the oxidization burning loss of generation; Alloying element scaling loss situation refers to the scaling loss ratio of alloying element.Alloying element mainly comprises Al, Ti, B, the oxidizable elements such as Ni, Cr.The scaling loss of for example Al is than being 60% to refer to that Al oxidized Al quality in whole smelting process is to start to add 60% of Al quality.Finally become slag because the alloy after being burnt forms oxide compound, can not enter into molten steel; Therefore must, according to the scaling loss of alloying element than calculating the amount of adding alloying element, ensure that the content of respective alloy element in molten steel meets the requirement of large-sized high-temperature alloy foundry goods.
In step 2) in high-temperature alloy casting cast to material requested smelt multiple little steel ingots by electroslag remelting furnace, described little steel ingot meets the requirement of large-sized high-temperature alloy foundry goods, and little steel ingot total mass is 110%～120% of the required steel quality of large-sized high-temperature alloy foundry goods.
Described little steel ingot refers to that the tonnage of steel ingot is less than the tonnage of large-sized high-temperature alloy foundry goods, and the quality of a large-sized high-temperature alloy foundry goods is equivalent to the quality of several little steel ingots.Describedly high-temperature alloy casting is cast to material requested smelt multiple little steel ingots by electroslag remelting furnace, the requirement that described little steel ingot meets large-sized high-temperature alloy foundry goods refers to casts high-temperature alloy casting the chemical composition of multiple little steel ingots that material requested smelts by electroslag remelting furnace and elementary compositionly meets large-sized high-temperature alloy foundry goods chemical composition and elementary composition requirement, the parameters of little steel ingot with need the parameter of large-sized high-temperature alloy foundry goods of casting consistent.
Because electroslag remelting furnace is transformed in step 1, the electroslag furnace obtaining after transformation has vacuum function, makes deoxidation, and decarburization etc. are more thorough, simultaneously owing to being that therefore the steel ingot of smelting little tonnage needs the molten steel smelted less; In smelting process, can strictly control the chemical composition in molten steel, avoid other impurity elements to enter into molten steel, smelt chemical composition and the elementary composition standard that meets large-sized high-temperature alloy foundry goods in the little steel ingot that.Little steel ingot total mass is 110%～120% of the required steel quality of large-sized high-temperature alloy foundry goods; Be because little steel ingot will be remelted formation molten steel in subsequent step, the molten steel that little steel ingot fusing forms will be used for casting large-scale high-temperature alloy casting; Therefore the quality of molten steel must be greater than the quality of the large-sized high-temperature alloy foundry goods of casting.Little steel ingot total mass is 110%～120% of the required steel quality of large-sized high-temperature alloy foundry goods, has considered that molten steel inevitably consumes and loss in casting process simultaneously; Guarantee has enough pouring molten steel molding large high-temperature alloy castings.
In step 3) in little steel ingot is carried out to chemical composition analysis, second-rate region, termination, little steel ingot two ends and surface oxide layer are removed, again little steel ingot is divided into and meets Large Electric Furnace and smelt the small powder to steel ingot width, specification of quality, put into Large Electric Furnace and smelt.
Described Large Electric Furnace refers to produces the electric furnace of tonnage more than 10 tons.Little steel ingot carries out chemical composition analysis, in order to ensure that all little steel ingots all meet the requirements, the little steel ingot that large-sized high-temperature alloy casting pouring requires that do not meet forming while avoiding due to castable enters into next technique, finally cause in the time smelting the required molten steel of large-sized high-temperature alloy casting pouring, molten steel is scrapped.
Second-rate region, termination, little steel ingot two ends and surface oxide layer are removed, and second-rate region, termination, described little steel ingot two ends refers to that hole, loose, the oxidized part that has mass defect appear in termination, steel ingot two ends.It is the molten steel of sneaking into a small amount of harmful element and impurity and finally enter into castable large-sized high-temperature alloy foundry goods in this part by this Partial Resection.Need molten steel to carry out the adjustment of chemical composition and the difficulty of removal detrimental impurity thereby be conducive to reduce in subsequent step.
Again little steel ingot is divided into and meets Large Electric Furnace and smelt the small powder to steel ingot lumpiness, specification of quality, put into Large Electric Furnace and smelt; In order to make little steel ingot can smelt into fast molten steel in Large Electric Furnace, to ensure the scaling loss situation of various alloying elements in little steel ingot in allowed limits simultaneously.
In step 4) in, the molten steel after Large Electric Furnace is smelted is poured in ladle refining furnace and is smelted, and by molten steel carry out deoxidation, decarburization, remove H, N processes, inspection molten steel chemical composition, and molten steel chemical composition being adjusted according to high-temperature alloy casting standard; Until molten steel chemical composition meets the requirement of large high-temperature foundry goods.Ladle refining furnace is in step 1) in carried out technological transformation, make the vacuum tightness of ladle refining furnace lower, the vacuum stability that can form in ladle refining furnace is good, thereby molten steel is carried out to deoxidation, decarburization, remove H, N processes, can make H, O, N be reduced to lower level, can prevent from that impurity element from sneaking into cause molten steel chemical composition not conform to simultaneously.To molten steel carry out deoxidation, decarburization, remove H, N processes is in order to make to remove impurity and the harmful element in molten steel.Inspection molten steel chemical composition, and according to high-temperature alloy casting standard, molten steel chemical composition is adjusted; Until molten steel chemical composition meets the requirement of large high-temperature foundry goods; In order to make molten steel finally can meet the requirement of large high-temperature foundry goods.
In step 5) in molten steel is carried out to the cast of large-sized high-temperature alloy foundry goods; The final large high-temperature foundry goods that forms.
Large-sized high-temperature alloy foundry goods Metal smelting method of the present invention is by step 1) in transform common electroslag remelting furnace the electroslag furnace with vacuum function as, therefore in step 2) in to smelt in the little steel ingot obtaining chemical composition purity by electroslag furnace high, in little steel ingot, nitrogen content is low, and oxygen level is low.Due in step 2) in needs are smelted into large-sized high-temperature alloy foundry goods material first smelt into little steel ingot.In the smelting process of little steel ingot, its chemical composition is regulated, the gaseous impurities in little steel ingot is extracted by vacuum simultaneously, make the gaseous impurities content in little steel ingot low.Little steel ingot is carried out to decarburization, deoxidation, made chemical constitution in little steel ingot meet the requirement of the chemical constitution of large-sized high-temperature alloy foundry goods.Then in step 3) in little steel ingot is put in Large Electric Furnace and is smelted, obtain molten steel, in step 4, molten steel carried out to adjustment and further decarburization, the deoxidation of chemical element, going H, N to process, thereby can make the objectionable impurities in molten steel less, make the content of C in molten steel, 0, H, N lower, can be good at controlling the chemical composition of molten steel.
First the material that large-sized high-temperature alloy foundry goods smelted into by needs by the present invention smelts into little steel ingot, in the smelting process of little steel ingot, the chemical composition of material has been carried out adjusting for the first time and controlling, and harmful element and gaseous impurities are removed.The molten steel amount needing due to the cast of little steel ingot is less, all relative simple and ripe with adjusting to the control of the chemical element in molten steel in the process of the smelting of therefore little steel ingot, can be good at controlling gaseous impurities and harmful element in molten steel.Therefore make the purity of little steel ingot higher.Then in subsequent step, multiple little steel ingots are melted and obtain molten steel in Large Electric Furnace, and then molten steel is poured in ladle refining furnace, carries out deoxidation, decarburization, go H, N to process, and according to large-sized high-temperature alloy foundry goods standard, molten steel chemical composition is adjusted.Therefore the molten steel being equivalent to carrying out large-sized high-temperature alloy foundry goods has carried out the adjustment of twice chemical composition and the removal of gaseous impurities and harmful element.Thereby can disposable acquisition large-tonnage high quality superalloy molten steel, realize the production of large-sized high-temperature alloy foundry goods.
Embodiment mono-
Certain steam turbine massive casting valve casing, castings material is superalloy Inconel 625, foundry goods net weight 15t needs the about 20t of superalloy molten steel.Superalloy smelting process is as follows:
1, required equipment in large-tonnage superalloy fusion process is undergone technological transformation as equipment such as electric furnace and ladle essence smelting stoves, before formal smelting superalloy, should adopt nickel prepurging, clean residual steel, residue in ladle refining furnace and Large Electric Furnace stove, while ensureing that superalloy is smelted, the residual element content such as Fe is below 5%; Common electroslag remelting furnace is transform as to the electroslag furnace with vacuum function, the vacuum system of ladle refining furnace is upgraded, make the vacuum tightness of ladle refining furnace be less than 66.7pa.
2, determine the formula of the little steel ingot of superalloy according to the empirical value of the scaling loss situation of the requirement of valve casing chemical composition and Steelmaking interalloy element; Castings material is superalloy Inconel 625.
3,, according to the required high-temperature alloy steel water inventory of valve casing, determine and produce 4,5.5 tons of Inconel 625 steel ingots; Adopt vacuum induction furnace to produce the electrode bar of φ 300mm left and right, then adopt electro-slag re-melting method, produce 4 little tonnage steel ingots of Inconel 625, chemical composition and quality to every steel ingot are tested, and chemical composition meets design requirements.
4,100mm is excised respectively in 45 tons of steel ingot two ends, remove ingot body epidermis 10mm by the method for polishing or mechanical workout, then cut apart the small powder into about φ 800mm × 300mm, and it is carried out to strict baking, reduce harmful element and sneak into; 20 tons of electric furnaces that superalloy small powder after treatment is put into after technological transformation are smelted.
5, the molten steel after smelting is put into ladle refining furnace is smelted and carry out the processing of vacuum deaeration carbon elimination; According to high-temperature alloy casting standard or technical qualification, molten steel chemical composition and temperature are adjusted.
6, inspection molten steel chemical composition is carried out the casting of large-sized high-temperature alloy foundry goods after qualified; The final large-sized high-temperature alloy foundry goods that obtains.
Claims (4)
1. large-sized high-temperature alloy foundry goods Metal smelting method, is characterized in that comprising the following steps:
1) transform common electroslag remelting furnace the electroslag furnace with vacuum function as, the vacuum system of ladle refining furnace is upgraded, make the vacuum tightness of ladle refining furnace be less than 66.7pa; Determine the formula of high-temperature alloy casting casting material requested according to the empirical value of the scaling loss situation of the requirement of high-temperature alloy casting chemical composition and Steelmaking interalloy element;
2) high-temperature alloy casting is cast to material requested and smelted into multiple little steel ingots by electroslag furnace, described little steel ingot meets the requirement of large high-temperature foundry goods; Little steel ingot total mass is 110%～120% of the required steel quality of large-sized high-temperature alloy foundry goods;
3) little steel ingot is carried out to chemical composition analysis, second-rate region, termination, little steel ingot two ends and surface oxide layer are removed, again little steel ingot is divided into and meets Large Electric Furnace and smelt the small powder to steel ingot lumpiness, specification of quality, put into Large Electric Furnace and smelt;
4) molten steel after Large Electric Furnace is smelted is poured in ladle refining furnace and is smelted, and by molten steel carry out deoxidation, decarburization, remove H, N processes, inspection molten steel chemical composition, and molten steel chemical composition being adjusted according to high-temperature alloy casting standard; Until molten steel chemical composition meets the requirement of large high-temperature foundry goods;
5) molten steel is carried out to the cast of large-sized high-temperature alloy foundry goods.
2. large-sized high-temperature alloy foundry goods Metal smelting method as claimed in claim 1, it is characterized in that: step 1) in common electroslag remelting furnace is being transform as to the electroslag furnace with vacuum function, vacuum system to ladle refining furnace is upgraded, the vacuum tightness of ladle refining furnace is less than after 66.7pa, further comprising the steps of, adopt nickel to clean residual iron in ladle refining furnace and Large Electric Furnace stove.
3. large-sized high-temperature alloy foundry goods Metal smelting method as claimed in claim 1, is characterized in that: step 2) the middle multiple little steel ingots of vacuum consumable+electric slag refusion and smelting that adopt.
4. large-sized high-temperature alloy foundry goods Metal smelting method as claimed in claim 1, is characterized in that: step 3) in polished in electroslag ingot surface, remove little surface of steel ingot zone of oxidation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113564447A (en) * | 2021-07-23 | 2021-10-29 | 二重（德阳）重型装备有限公司 | Vanadium-controlled Cr13 type hydroelectric stainless steel smelting method |
| CN117626017A (en) * | 2023-11-21 | 2024-03-01 | 四川远方高新装备零部件股份有限公司 | Processing method of NS3306 sheet steel ingots used for manufacturing front chamber |
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| WO2023000707A1 (en) * | 2021-07-23 | 2023-01-26 | 二重（德阳）重型装备有限公司 | Vanadium-controlled cr13 type hydroelectric stainless steel smelting method |
| CN117626017A (en) * | 2023-11-21 | 2024-03-01 | 四川远方高新装备零部件股份有限公司 | Processing method of NS3306 sheet steel ingots used for manufacturing front chamber |
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