CN104119082A - Chromium-free casting material for outer lining of RH (Relative Humidity) furnace inserting tube - Google Patents
Chromium-free casting material for outer lining of RH (Relative Humidity) furnace inserting tube Download PDFInfo
- Publication number
- CN104119082A CN104119082A CN201310153892.4A CN201310153892A CN104119082A CN 104119082 A CN104119082 A CN 104119082A CN 201310153892 A CN201310153892 A CN 201310153892A CN 104119082 A CN104119082 A CN 104119082A
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- chromium
- outer lining
- casting material
- mould material
- inserting tube
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Abstract
The invention discloses a chromium-free casting material for an outer lining of a RH (Relative Humidity) furnace inserting tube, which is used for mainly solving the technical problems that a novel chromium-free environmental-friendly casting material is adopted to replace a magnesium-chromium casting material for the outer lining of the RH inserting tube of the prior art and the service life of the casting material is not shorter than that of the magnesium-chromium casting material. According to the technical scheme, the chromium-free casting material for the outer lining of the RH furnace inserting tube comprises the following raw material components in percentage by weight: 65-70% of corundum, 7-12% of mullite, 0.5-2% of MgCO3 micro powder, 10-15% of pure calcium aluminate cement and 4-10% of Al2O3 micro powder. The chromium-free casting material is mainly applied to casting on the outer lining of the RH furnace inserting tube.
Description
Technical field
The present invention relates to the unsetting mould material of industrial thermal equipment, particularly a kind of Chrome-free mould material for RH stove tubular stinger outer lining.
Background technology
The He Hai of Rule company (Ruhrstahl) Lars company (Heraeus) under RH vacuum deaeration refining method Shi You Thyssen company (Tyssen) has succeeded in developing vacuum molten steel circulation degassing method jointly, the name of two Yong Qi companies of company is by this molten steel refining method called after RH vacuum deaeration refining method, the method can make [O] in molten steel, [N] further reduce, for the smelting to the high steel grade of molten steel composition cleanliness factor.
RH stove tubular stinger working conditions mainly contains three aspects:, and the one, stand the erosion of washing away of swiftly flowing air-flow and molten steel; The 2nd, the erosion of slag and infiltration; The 3rd, the thermal spalling that batch production temperature fluctuation causes and structure spalling.In prior art, the resistance to material that can fit this industrial and mineral condition is Magnesia chrome castable, and its chief component contains Cr
2o
3and CrO
3, this mould material is mainly utilized the high temperature resistant and erosion-resisting characteristics of chromium, due to Cr
2o
3and CrO
3under acidic conditions, water-soluble formation sodium dichromate 99, potassium bichromate have carinogenicity, harmful, unfriendly to environment.
Chinese patent, application number is that CN201210178056.7 " a kind of permanent ladle layer mould material " provides a kind of mould material that does not contain chromium, by fused mullite 40～50%, electrofused mullite 10～15%, corundum 15～20%, ultra-fine alumina powder 5～10%, silicon oxide ultrafine powder 5～10%, pure calcium aluminate cement 6～8%, floating pearl 2.2～4.0% forms, but being the high ladle weight producing of the large thermal conductivity of permanent ladle layer mould material volume density that solves prior art, its goal of the invention increases and then increases transportation equipment load, the technical problem that the large energy loss of molten steel temperature drop is many, this mould material does not have the aggressiveness of resistance to molten steel.
Summary of the invention
The object of this invention is to provide a kind of Chrome-free mould material for RH stove tubular stinger outer lining, mainly solve the Magnesia chrome castable of using with the RH stove tubular stinger outer lining of the alternative prior art of a kind of new chromium-free environment-friendly type mould material, be not less than the technical problem of Magnesia chrome castable its work-ing life.
The technical solution used in the present invention is:
For a Chrome-free mould material for RH stove tubular stinger outer lining, the weight percent of its feed composition is: corundum 65%～70%, mullite 7%～12%, MgCO
3micro mist 0.5%～2%, pure calcium aluminate cement 10%～15%, Al
2o
3micro mist 4%～10%.
The aggregate of mould material of the present invention is that mullite-corundum is compound, and corundum has stronger resistance to molten steel scouring capability, and slag is not easy to corrode and infiltration, but its composition is too high, its thermal shock resistance declines, and rapid heat cycle can cause its cracking, and then peel off, through experiment, 65%～70% corundum content is good.
The thermal expansivity of mullite material is little, be pin, column and grow and be conducive to anti-thermal shock, can effectively prevent peeling off of material, this patent mullite material is comprised of fused mullite and electrofused mullite, its part by weight is 1: 1, fused mullite is fine crystalline structure, and mullite crystal yardstick in electrofused mullite material is larger, and both collocation make its good toughness, more be conducive to the raising of thermal shock resistance, but the erosion of its resistance to molten steel is not as corundum, and through experiment, 7%～12% mullite content is good.
The combination of mould material of the present invention is with Hydraulic binding and Coagulating binding use.Hydraulic binding is realized by pure calcium aluminate cement, pure calcium aluminate cement can form mould material to have high-intensity base substrate fast, but that its content is difficult for is too high, and pure calcium aluminate cement content is high, at high temperature easily make blank cracking peel off, 10%～15% pure calcium aluminate cement content is good.Coagulating binding is produced by aluminium oxide powder, and aluminium oxide powder is conducive to the hot strength under anti-cracking property raising and use temperature, thereby guarantees the abrasion resistance of resistance to molten steel; The effect of aluminium oxide powder is also to improve fillibility, reduces amount of water, improves liquidity and promote development low, medium temperature intensity.Through experiment, Al
2o
3be advisable in particle diameter≤2 of micro mist micron.
MgCO in mould material of the present invention
3micro mist is decomposed to form the magnesium oxide with certain activity degree at 900 ℃, this magnesium oxide can with corundum in aluminium sesquioxide form fast fusing point and reach 2100 ℃ of above magnesium-aluminium spinels, and then strengthened the erosion of resistance to molten steel, and then improved its work-ing life; MgCO
3mould material expansion stress at high temperature can be eliminated in the microchannel that the gas that micro mist decomposition produces forms in discharge process, prevents that the cracking of mould material from peeling off; But, MgCO
3powder content can not be too high, because MgCO
3micro mist decomposes the gas producing too much can increase the void content of material, and then reduces the intensity of material, reduces on the contrary the abrasion resistance of molten steel, through experiment, its MgCO
3content be 0.5%～2% better, MgCO
3be advisable in particle diameter≤2 of micro mist micron.
Constructional method of the present invention is:
Add a certain amount of water in mould material after, mould material is mixed more than 3 minutes, the add-on of water is 5～6% of mould material total mass, then make the mould of RH stove tubular stinger outer tube, the mould material being mixed is joined in mould, with vibrating head, in mould, stir, operating vibration rod time should make vibrating head slowly move, and must not shake for a long time on one point, also must not vibrate for a long time and causes expecting segregation.After construction, vibrating head should slowly be extracted, and in material, does not leave hole, hole after control is extracted vibrating head; After moulding must together with standing 24 hours of mould is above can the demoulding, after the demoulding, must continue maintenance 2 days or longer time in temperature is the room of 30 ℃ of left and right.RH stove tubular stinger after maintenance can normally be used as finished product.
Be not less than Magnesia chrome castable the work-ing life of mould material of the present invention, not containing chromium, harmless in mould material, is environmental friendly product, and mould material manufacturing cost of the present invention, not higher than Magnesia chrome castable, has good economy.
The present invention has following positively effect compared to existing technology:
1. in mould material of the present invention, do not contain chromium, harmless, be environmental friendly product.
2. be not less than Magnesia chrome castable the work-ing life of mould material of the present invention, mould material manufacturing cost, not higher than Magnesia chrome castable, has good economy, has realized RH stove tubular stinger outer lining is substituted with the success of Magnesia chrome castable.
Embodiment
For a Chrome-free mould material for RH stove tubular stinger outer lining, the weight percent of its feed composition is: corundum 65%～70%, mullite 7%～12%, MgCO
3micro mist 0.5%～2%, pure calcium aluminate cement 10%～15%, Al
2o
3micro mist 4%～10%.The embodiment of the present invention is in Table one.
Table one: for the Chrome-free mould material embodiment table of RH stove tubular stinger outer lining
Mould material preparation of the present invention and constructional method are:
First by fused mullite and electrofused mullite, the ratio according to 1: 1 prepares, then by corundum, mullite, MgCO
3micro mist, pure calcium aluminate cement, Al
2o
3micro mist carries out weigh batching, mixes 10～15 minutes in model is JBN1000 forced mixer, adds a certain amount of water in mould material, and the add-on of water is 5～6% of mould material total mass, adds after being mixed 3 minutes after water and can pour into a mould by blowing.
The mould that the mould material being mixed is added to RH stove tubular stinger outer tube, when reinforced, open vibrating head, the vibration while feeding in raw material, until reinforced complete, then till vibrating 2-3 minute and discharging without a large amount of bubbles with surperficial bleeding, vibrating head operator should make vibrating head slowly move, must not shake for a long time on one point, also must not vibrate for a long time and cause expecting segregation.After construction, vibrating head should slowly be extracted, and in material, does not leave hole, hole after control is extracted vibrating head; After moulding must together with standing 24 hours of mould is above can the demoulding, after the demoulding, must continue maintenance 2 days or longer time in temperature is the room of 30 ℃ of left and right.RH stove tubular stinger after maintenance can normally be used as finished product.
By the comparison in the RH stove tubular stinger outer lining work-ing life under same operating to adopting the RH stove tubular stinger outer lining that mould material of the present invention makes and making with Magnesia chrome castable in prior art, RH stove tubular stinger outer lining average out in work-ing life 99 stoves that mould material of the present invention is made, and be 90 stoves RH stove tubular stinger outer lining work-ing life under same operating made from Magnesia chrome castable in prior art, the work-ing life of mould material of the present invention, middle Magnesia chrome castable improved 10% work-ing life compared to existing technology, in mould material of the present invention, do not contain chromium, manufacturing cost is not higher than Magnesia chrome castable, there is good economy, realized RH stove tubular stinger outer lining has been substituted with the success of Magnesia chrome castable.
Claims (3)
1. for a Chrome-free mould material for RH stove tubular stinger outer lining, it is characterized in that, the weight percent of feed composition is: corundum 65%～70%, mullite 7%～12%, MgCO
3micro mist 0.5%～2%, pure calcium aluminate cement 10%～15%, Al
2o
3micro mist 4%～10%.
2. a kind of Chrome-free mould material for RH stove tubular stinger outer lining as claimed in claim 1, is characterized in that described MgCO
3particle diameter≤2 micron of micro mist.
3. a kind of Chrome-free mould material for RH stove tubular stinger outer lining as claimed in claim 1, is characterized in that described Al
2o
3particle diameter≤2 micron of micro mist.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310153892.4A CN104119082A (en) | 2013-04-28 | 2013-04-28 | Chromium-free casting material for outer lining of RH (Relative Humidity) furnace inserting tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310153892.4A CN104119082A (en) | 2013-04-28 | 2013-04-28 | Chromium-free casting material for outer lining of RH (Relative Humidity) furnace inserting tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104119082A true CN104119082A (en) | 2014-10-29 |
Family
ID=51764752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310153892.4A Pending CN104119082A (en) | 2013-04-28 | 2013-04-28 | Chromium-free casting material for outer lining of RH (Relative Humidity) furnace inserting tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104119082A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104355635A (en) * | 2014-10-30 | 2015-02-18 | 攀枝花钢城集团有限公司 | Casting material and preparation method and use thereof |
| CN110395997A (en) * | 2018-07-31 | 2019-11-01 | 山东科宇能源有限公司 | Calcining furnace tank skin repairs agent prescription and in lines mending method |
| CN111116181A (en) * | 2018-10-31 | 2020-05-08 | 南京梅山冶金发展有限公司 | Novel torpedo car refractory material lining and construction process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397213A (en) * | 2008-10-24 | 2009-04-01 | 浙江锦诚耐火材料有限公司 | Corundum-mullite self-flow refractory castable |
| CN101508587A (en) * | 2009-03-26 | 2009-08-19 | 中钢集团洛阳耐火材料研究院有限公司 | Corundum-spinel pouring material containing nano-magnesium carbonate |
-
2013
- 2013-04-28 CN CN201310153892.4A patent/CN104119082A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397213A (en) * | 2008-10-24 | 2009-04-01 | 浙江锦诚耐火材料有限公司 | Corundum-mullite self-flow refractory castable |
| CN101508587A (en) * | 2009-03-26 | 2009-08-19 | 中钢集团洛阳耐火材料研究院有限公司 | Corundum-spinel pouring material containing nano-magnesium carbonate |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104355635A (en) * | 2014-10-30 | 2015-02-18 | 攀枝花钢城集团有限公司 | Casting material and preparation method and use thereof |
| CN110395997A (en) * | 2018-07-31 | 2019-11-01 | 山东科宇能源有限公司 | Calcining furnace tank skin repairs agent prescription and in lines mending method |
| CN110395997B (en) * | 2018-07-31 | 2022-01-21 | 山东科宇能源有限公司 | Formula of tank wall repairing agent for calcining furnace and online repairing method |
| CN111116181A (en) * | 2018-10-31 | 2020-05-08 | 南京梅山冶金发展有限公司 | Novel torpedo car refractory material lining and construction process |
| CN111116181B (en) * | 2018-10-31 | 2022-04-15 | 南京梅山冶金发展有限公司 | Refractory material lining of torpedo car and construction process |
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Application publication date: 20141029 |