CN103994663A - Method for prolonging service life of furnace lining of medium-frequency induction furnace - Google Patents
Method for prolonging service life of furnace lining of medium-frequency induction furnace Download PDFInfo
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- CN103994663A CN103994663A CN201410258241.6A CN201410258241A CN103994663A CN 103994663 A CN103994663 A CN 103994663A CN 201410258241 A CN201410258241 A CN 201410258241A CN 103994663 A CN103994663 A CN 103994663A
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- 230000006698 induction Effects 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000010425 asbestos Substances 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 229910052895 riebeckite Inorganic materials 0.000 claims abstract description 22
- 239000011819 refractory material Substances 0.000 claims abstract description 18
- 239000004744 fabric Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000004327 boric acid Substances 0.000 claims abstract description 7
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 4
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 150000001875 compounds Chemical class 0.000 claims description 17
- 229910001018 Cast iron Inorganic materials 0.000 claims description 13
- 238000005245 sintering Methods 0.000 claims description 13
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 10
- 239000001095 magnesium carbonate Substances 0.000 claims description 10
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 10
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000008569 process Effects 0.000 description 10
- 239000000126 substance Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000007499 fusion processing Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 240000007643 Phytolacca americana Species 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000005619 boric acid group Chemical group 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 229910021652 non-ferrous alloy Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Landscapes
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention provides a method for prolonging the service life of a furnace lining of a medium-frequency induction furnace. The method includes the following steps that (1) after a refractory material is selected and the particle size and the ratio of the refractory material are determined, the refractory material is evenly mixed, and boric acid and water are added into the material to be evenly mixed for standby application; (2) an asbestos plate is laid at the bottom of a furnace body, an asbestos cloth is surrounded on the inner wall of the furnace body, and the asbestos cloth is pressed on the inner wall of the furnace body to be tightly fixed through a spring ring; (3) a furnace lining mixture is added on the asbestos plate to be evenly tamped, so that a furnace lining bottom wall is formed; (4) then, a metal crucible die is placed in the furnace body, the center of the furnace body is determined, the outer circle of a metal crucible is filled with the furnace lining mixture, tamping is conducted layer by layer, so that a furnace lining inner wall is formed, and then a furnace collar and a furnace nozzle are manufactured; (5) the metal crucible die is taken out, the furnace lining bottom wall, the furnace lining inner wall, the furnace collar and the furnace nozzle are coated with water glass which is diluted by water, and natural drying is carried out for 24 hours; (6) the furnace lining bottom wall and the furnace lining inner wall are sintered. By the adoption of the method, the high temperature strength of the furnace lining of the medium-frequency induction furnace is improved, and the service life of the furnace lining of the medium-frequency induction furnace is prolonged.
Description
Technical field
The present invention relates to medium-frequency induction furnace field, be specifically related to a kind of method that extends medium-frequency induction furnace lining durability.
Background technology
Medium-frequency induction furnace is fast because of its burn-off rate, and metallic solution temperature is high, and chemical composition is even, the advantages such as simple and convenient operation and maintenance, application in modern foundry enterprise is very extensive, and progressively to large scale development, the melting of various cast iron, cast steel and non-ferrous alloy can be used.The furnace lining of medium-frequency induction furnace is the important process parts of medium-frequency induction furnace, it keeps apart the inductor of high-temperature molten steel and stove, and bear the high temperature action (>=1500 DEG C) in fusion process, severe impact and the collision of furnace charge while in use often feeding in raw material due to furnace lining, when melting, the stirring action of electromagnetism can cause the violent scour of molten metal to furnace lining, slag makes temperature of furnace lining produce quenching to the chemical erosion of furnace lining and interruption operation, when shock heating variation, therefore larger to the damageability of furnace lining, furnace lining is cracked, corrode, peel off etc., when serious, can cause molten metal poke lining and cause leak accident.
And the high-temperature behavior of medium-frequency induction furnace furnace lining depends primarily on physics, chemical property and the mineral composition of refractory material used, under the selected prerequisite of refractory material, sintering process is to make furnace lining obtain good microstructure to give full play to the critical process of its resistance to elevated temperatures.The densification degree of lining sintering is relevant with factors such as the chemical composition of refractory material, grain size proportion, sintering process and sintering temperatures, therefore the present invention is entrance from selection, furnace building process and the sintering process of refractory material, studies a kind of method that extends medium-frequency induction furnace lining durability.
Summary of the invention
The problem existing in order to solve prior art, the invention provides a kind of method that extends medium-frequency induction furnace lining durability, the method is by the selection of refractory material, adjust granularity and the proportioning parameter of refractory material, the improvement of furnace building process and sintering process, improve the elevated temperature strength of medium-frequency induction furnace furnace lining, thereby extend the life-span of medium-frequency induction furnace furnace lining.
In order to achieve the above object, the technical solution adopted in the present invention is:
A method that extends medium-frequency induction furnace lining durability, comprises the steps:
1) select refractory material and determine after the granularity and proportioning of refractory material, mixing, again mixing after adding boric acid, then add water and mix to obtain furnace lining compound, furnace lining compound is built with wet gunnysack, placement 20-30 minute, stand-by;
2) medium-frequency induction furnace has body of heater, body of heater comprises stove outer covering and is placed in the induction coil of stove outer covering inside, asbestos board is spread in bottom at body of heater, and the inwall of body of heater is that the inwall that induction coil surrounds is placed asbestos cloth, and asbestos cloth is pressed on inboard wall of furnace body fixing tight with turn;
3) furnace lining compound is added on asbestos board, and evenly tamping, furnace lining diapire formed;
4) again metallic crucible model is placed in body of heater, determined body of heater center, insert furnace lining compound tamping layer by layer in the outer ring of metallic crucible, form furnace lining inwall, then make stove neck and converter nose;
5) take out metallic crucible model, on furnace lining diapire, furnace lining inwall, stove neck and converter nose, brush through water-reducible waterglass natural drying 24 hours;
6) sintered lining diapire and furnace lining inwall.
Preferably, step 1) in refractory material be fused magnesite, fused magnesite granularity, proportioning and boric acid addition by weight ratio be,
Preferably, in above-mentioned fused magnesite, magnesian content is more than or equal to 90%, and not containing low melting point impurity and conductive magnetic properties impurity.
Preferably, step 2) in spread asbestos board and make the bottom thickness of body of heater increase 6-8mm, place asbestos cloth and make inboard wall of furnace body thickness increase 6-8mm.
Preferably, step 3) in the thickness of furnace lining diapire be 50-70mm.
Preferably, step 4) in the thickness of furnace lining inwall be 40-60mm.
Preferably, step 6) be specially, in the cavity being formed by furnace lining diapire and furnace lining inwall, block-by-block adds cast iron furnace charge, the surrounding of cast iron furnace charge and furnace lining inwall keep 5-10mm gap, open medium-frequency induction furnace, make the fusing of cast iron furnace charge, to fusing after molten metal in continue to add cast iron furnace charge, make the upper edge of the rear metal bath surface of its fusing to furnace lining inwall, carry out low temperature to high temperature sintering, pour out molten metal, clean out rear inspection furnace lining flawless, damage, when the defect such as drop, just can put into production.
Preferably, above-mentioned low temperature to high temperature sintering divides 5 stages, low temperature first stage intensification power 20kw, keep 40min, low temperature second stage intensification power 40kw, keeps 40min, high temperature phase III intensification power 60kw, keep 40min, high temperature fourth stage intensification power 80kw, keeps 60min, high temperature five-stage intensification power 100kw, keep 60min, temperature is risen to 1500 DEG C～1550 DEG C insulations 30 minutes by the peak power of opening afterwards medium-frequency induction furnace.
Preferably, the molten weight metal of medium-frequency induction furnace in said method is 100-150kg.
The present invention has following beneficial effect:
1, extend medium-frequency induction furnace basic-lined service life, solved leak accident, improved furnace lining intensity, made the tendency of furnace lining crackle, drop postpone and reduce, improved quality of molten metal, reduced the generation of slag inclusion, sand holes defect.
2, by limiting granularity and the proportioning parameter of fused magnesite, can improve the intensity of furnace lining compound, reduce molten steel and in fusion process, wash away furnace wall, and cause furnace wall drop damage, if be rolled onto in molten steel, will cause dreg defect.
3, the thickness of furnace lining diapire is 50-70mm, and the thickness of furnace lining inwall is 40-60mm.This thickness is applicable to the stove that medium-frequency induction furnace capacity is 100-150kg, selects such thickness both to ensure that furnace lining has higher conductivity of heat to reduce thermal loss, had again enough intensity bear the weight of molten steel and be not fused.
4, by the sintering in 5 stages, be conducive to water and the effusion of tying intercrystalline water in furnace lining material, be conducive to furnace lining material and form from the inside to the outside the sinter layer, transition zone and the unconsolidated formation that respectively account for 1/3 thickness, so not only ensure that furnace lining has certain high temperature resistance erosiveness, can ensure that again it has good intensity and toughness.
5, the inventive method makes furnace lining have good micro texture, gives full play to the resistant to elevated temperatures performance of furnace lining.
Brief description of the drawings
Fig. 1 is medium-frequency induction furnace furnace lining process schematic representation in the present invention.
1-metallic crucible model, 2-asbestos cloth, 3-asbestos board, 4-furnace lining compound, 5-furnace lining inwall, 6-furnace lining diapire, 7-body of heater, 8-stove neck, 9-converter nose.
Detailed description of the invention
Embodiment, a kind of method that extends medium-frequency induction furnace lining durability
Selecting melted weight metal is 100-150kg medium-frequency induction furnace, and the method that extends this medium-frequency induction furnace lining durability specifically comprises the steps:
1) select refractory material, refractory material should have enough mechanical strengths and fire-resistant intensity; Good chemical stability: resistance to thermal shocks preferably; Low thermal conductivity and preferably electrical insulating property.The refractory material of selecting in the present embodiment is fused magnesite, and in this fused magnesite, magnesian content is more than or equal to 90%, and not containing low melting point impurity and conductive magnetic properties impurity.Cosolvent is boric acid, and wetting agent is water, and it is as follows by weight ratio,
Mix by the granularity of above-mentioned fused magnesite and proportioning, then said ratio adds boric acid to mix, finally add appropriate water, again mix to obtain furnace lining compound 4, wet furnace lining compound 4 use gunnysack is built, place 20-30 minute, stand-by.
2) medium-frequency induction furnace has body of heater 7, and body of heater 7 comprises stove outer covering and is placed in the induction coil of stove outer covering inside, spreads asbestos board 3 in the bottom of body of heater 7, makes body of heater 7 bottom thickness increase 6-8mm; The inwall of body of heater 7 is that the inwall that induction coil surrounds is placed asbestos cloth 2, makes body of heater 7 inner wall thickness increase 6-8mm, and asbestos cloth 2 is pressed on body of heater 7 inwalls fixing tight with turn.
3) furnace lining compound 4 is added on asbestos board 3, and evenly tamping, form furnace lining diapire 6, add furnace lining compound 4 layereds to add, adding before lower one deck furnace lining compound 4, now front one deck is smash to 4 strokes of pines of tight furnace lining compound, to strengthen the combination between each layer, until the thickness of furnace lining diapire 6 reaches 50-70mm.
4) again metallic crucible model 1 is placed in body of heater 7, determine body of heater 7 centers, insert furnace lining compound 4 tamping layer by layer in the outer ring of metallic crucible model 1, form furnace lining inwall 5, the thickness that ensures furnace lining inwall 5 is 40-60mm, then makes stove neck 8 and converter nose 9;
5) take out metallic crucible model 1, on furnace lining diapire 6, furnace lining inwall 5, stove neck 8 and converter nose 9, brush through water-reducible waterglass natural drying 24 hours.
6) sintered lining diapire 6 and furnace lining inwall 5.In the cavity being formed by furnace lining diapire 6 and furnace lining inwall 5, block-by-block adds cast iron furnace charge, the surrounding of cast iron furnace charge and furnace lining inwall 5 keep 5-10mm gap, open medium-frequency induction furnace, make cast iron furnace charge fusing, in the molten metal after fusing, continue to add cast iron furnace charge, make after its fusing metal bath surface to the upper edge of furnace lining inwall 5, carry out low temperature to high temperature sintering, pour out molten metal, clean out rear inspection furnace lining flawless, damage, when the defect such as drop, just can put into production.
Low temperature to high temperature sintering divides 5 stages, low temperature first stage intensification power 20kw, keeps 40min, low temperature second stage intensification power 40kw, keep 40min, high temperature phase III intensification power 60kw, keeps 40min, high temperature fourth stage intensification power 80kw, keep 60min, high temperature five-stage intensification power 100kw, keeps 60min, after temperature is risen to 1500 DEG C～1550 DEG C by the peak power of opening afterwards medium-frequency induction furnace, is incubated 30 minutes.
The later maintenance of furnace lining, in actual charging process, in order to prevent that furnace lining is broken, avoid directly heavier furnace charge being dropped in stove, before dress bulk furnace charge 3, should fill some less furnace charges at furnace bottom; In furnace charge fusion process, want diligent observation, avoid scaffold and get stuck, reduce the impact of furnace charge to furnace wall, furnace bottom.If switch board occurs compared with catastrophe failure or power failure, should be in time by metal charge or molten metal everywhere, prevent metal integral in stove and condense.If stove is not continuous use, after once using, in stove, add some metal charges, prevent because of quick cooling precocity furnace lining crackle.Medium-frequency induction furnace in fusion process at the bottom of furnace lining and wall be easy to be corroded and come off, in very serious situation, can, by suitable furnace building material damping, furnace bottom impurity be removed to rear shovel and enter furnace bottom, carry out " vulcanizing " with compactor tamping.
Claims (9)
1. extend a method for medium-frequency induction furnace lining durability, it is characterized in that comprising the steps:
1) select refractory material and determine after the granularity and proportioning of refractory material, mixing, again mixing after adding boric acid, then add water and mix to obtain furnace lining compound, furnace lining compound is built with wet gunnysack, placement 20-30 minute, stand-by;
2) medium-frequency induction furnace has body of heater, body of heater comprises stove outer covering and is placed in the induction coil of stove outer covering inside, asbestos board is spread in bottom at body of heater, and the inwall of body of heater is that the inwall that induction coil surrounds is placed asbestos cloth, and asbestos cloth is pressed on inboard wall of furnace body fixing tight with turn;
3) furnace lining compound is added on asbestos board, and evenly tamping, furnace lining diapire formed;
4) again metallic crucible model is placed in body of heater, determined body of heater center, insert furnace lining compound tamping layer by layer in the outer ring of metallic crucible, form furnace lining inwall, then make stove neck and converter nose;
5) take out metallic crucible model, on furnace lining diapire, furnace lining inwall, stove neck and converter nose, brush through water-reducible waterglass natural drying 24 hours;
6) sintered lining diapire and furnace lining inwall.
2. method according to claim 1, is characterized in that step 1) in refractory material be fused magnesite, fused magnesite granularity, proportioning and boric acid addition by weight ratio be,
3. method according to claim 2, is characterized in that, in described fused magnesite, magnesian content is more than or equal to 90%, and not containing low melting point impurity and conductive magnetic properties impurity.
4. method according to claim 1, is characterized in that step 2) in spread asbestos board make bottom of furnace body thickness increase 6-8mm, place asbestos cloth make inboard wall of furnace body thickness increase 6-8mm.
5. method according to claim 1, is characterized in that step 3) in the thickness of furnace lining diapire be 50-70mm.
6. method according to claim 1, is characterized in that step 4) in the thickness of furnace lining inwall be 40-60mm.
7. method according to claim 1, it is characterized in that, step 6) be specially, in the cavity being formed by furnace lining diapire and furnace lining inwall, block-by-block adds cast iron furnace charge, and the surrounding of cast iron furnace charge and furnace lining inwall keep 5-10mm gap, open medium-frequency induction furnace, make cast iron furnace charge fusing, in the molten metal after fusing, continue to add cast iron furnace charge, make after its fusing metal bath surface to the upper edge of furnace lining inwall, carry out low temperature to high temperature sintering, remove molten metal.
8. method according to claim 7, it is characterized in that, low temperature to high temperature sintering divides 5 stages, low temperature first stage intensification power 20kw, keep 40min, low temperature second stage intensification power 40kw, keep 40min, high temperature phase III intensification power 60kw, keeps 40min, high temperature fourth stage intensification power 80kw, keep 60min, high temperature five-stage intensification power 100kw, keeps 60min, and temperature is risen to 1500 DEG C～1550 DEG C insulations 30 minutes by the peak power of opening afterwards described medium-frequency induction furnace.
9. according to the arbitrary described method of claim 1-8, it is characterized in that, the molten weight metal of described medium-frequency induction furnace is 100-150kg.
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| CN201410258241.6A CN103994663B (en) | 2014-06-11 | 2014-06-11 | A kind of method extending medium-frequency induction furnace lining durability |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104534877A (en) * | 2014-12-18 | 2015-04-22 | 本钢板材股份有限公司 | Composition used for manufacturing crucible of medium-frequency induction furnace |
| CN104713364A (en) * | 2015-02-25 | 2015-06-17 | 托普工业(江苏)有限公司 | Medium-frequency inductance electricity molten steel leakage preventing method |
| CN105177598A (en) * | 2015-10-15 | 2015-12-23 | 杭州科德磁业有限公司 | Technique for grain boundary diffusion of heavy rare earth of neodymium-iron-boron magnet |
| CN106187122A (en) * | 2016-06-29 | 2016-12-07 | 焦作金鑫恒拓新材料股份有限公司 | A kind of intermediate frequency aluminium melting furnace furnace lining dry materials |
| CN108061464A (en) * | 2017-12-08 | 2018-05-22 | 首钢集团有限公司 | A kind of vacuum drying oven crucible knotting method |
| CN110567270A (en) * | 2019-08-26 | 2019-12-13 | 贵州安吉航空精密铸造有限责任公司 | Molten metal casting smelting system and installation method thereof |
| CN111023806A (en) * | 2019-11-25 | 2020-04-17 | 包头钢铁（集团）有限责任公司 | Preparation method of crucible for 25kg vacuum induction furnace |
| CN111664709A (en) * | 2020-06-09 | 2020-09-15 | 昆山市昌坚铸造有限公司 | Method for repairing bottom of electric furnace for casting |
| CN114353529A (en) * | 2022-01-12 | 2022-04-15 | 新疆八钢佳域工业材料有限公司 | Furnace lining baking method for zinc melting intermediate frequency furnace |
| CN114688880A (en) * | 2022-03-25 | 2022-07-01 | 滨州市宏诺新材料有限公司 | Furnace building method capable of prolonging service life of intermediate frequency furnace |
| CN117902881A (en) * | 2024-03-20 | 2024-04-19 | 锦州恒泰特种合金有限公司 | Composite refractory material for ferrotitanium vacuum smelting ramming furnace lining and application thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104534877A (en) * | 2014-12-18 | 2015-04-22 | 本钢板材股份有限公司 | Composition used for manufacturing crucible of medium-frequency induction furnace |
| CN104713364A (en) * | 2015-02-25 | 2015-06-17 | 托普工业(江苏)有限公司 | Medium-frequency inductance electricity molten steel leakage preventing method |
| CN105177598A (en) * | 2015-10-15 | 2015-12-23 | 杭州科德磁业有限公司 | Technique for grain boundary diffusion of heavy rare earth of neodymium-iron-boron magnet |
| CN106187122A (en) * | 2016-06-29 | 2016-12-07 | 焦作金鑫恒拓新材料股份有限公司 | A kind of intermediate frequency aluminium melting furnace furnace lining dry materials |
| CN108061464A (en) * | 2017-12-08 | 2018-05-22 | 首钢集团有限公司 | A kind of vacuum drying oven crucible knotting method |
| CN110567270A (en) * | 2019-08-26 | 2019-12-13 | 贵州安吉航空精密铸造有限责任公司 | Molten metal casting smelting system and installation method thereof |
| CN111023806A (en) * | 2019-11-25 | 2020-04-17 | 包头钢铁（集团）有限责任公司 | Preparation method of crucible for 25kg vacuum induction furnace |
| CN111664709A (en) * | 2020-06-09 | 2020-09-15 | 昆山市昌坚铸造有限公司 | Method for repairing bottom of electric furnace for casting |
| CN114353529A (en) * | 2022-01-12 | 2022-04-15 | 新疆八钢佳域工业材料有限公司 | Furnace lining baking method for zinc melting intermediate frequency furnace |
| CN114688880A (en) * | 2022-03-25 | 2022-07-01 | 滨州市宏诺新材料有限公司 | Furnace building method capable of prolonging service life of intermediate frequency furnace |
| CN117902881A (en) * | 2024-03-20 | 2024-04-19 | 锦州恒泰特种合金有限公司 | Composite refractory material for ferrotitanium vacuum smelting ramming furnace lining and application thereof |
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| CN103994663B (en) | 2016-04-20 |
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