CN103663938A - Method for manufacturing induction furnace crucible by taking boric acid as additive - Google Patents
Method for manufacturing induction furnace crucible by taking boric acid as additive Download PDFInfo
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- CN103663938A CN103663938A CN201210353832.2A CN201210353832A CN103663938A CN 103663938 A CN103663938 A CN 103663938A CN 201210353832 A CN201210353832 A CN 201210353832A CN 103663938 A CN103663938 A CN 103663938A
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- quartz sand
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Abstract
The invention discloses a method for manufacturing an induction furnace crucible by taking boric acid as an additive, relating to the field of manufacturing process of an induction furnace crucible. The manufacturing method comprises the following steps: (1) crucible materials: the content of SO2 in quartz sand is higher than 98%, the content of impurities such as Al2O3, CaO and Fe2O3 is lower than 1.5%, and the water content is lower than or equal to 0.5%; and according to the particle size of the quartz sand, the quartz sand with particle size of 0-0.1mm accounts for 25%, the quartz sand with particle size of 0.1-1mm accounts for 10%, the quartz sand with particle size of 1-5mm accounts for 20%, the quartz sand with particle size of 5-20mm accounts for 25%, and the quartz sand with particle size of 20-40mm accounts for 20%; and (b) mixing the sand grains of all levels, and mixing with 0.8-1.5% of boric acid, and stirring uniformly. By adopting the method disclosed by the invention, the boron content in the primary molten steel can be increased, 80% of boron-containing gold can be saved, the product cost is reduced, and the production quality is improved.
Description
Technical field:
The present invention relates to the manufacture craft field of crucible induction furnace, relate in particular to a kind of method of making additive making crucible induction furnace of boric acid.
Background technology:
According to the alloying principle of steel, alloying element if form sosoloid, according to alloying element atomic radius size, is divided into three classes in steel: 1, the sub-radius of radius as sub-in unit and iron unit is suitable for Cr, Mn, and Si etc., form substitutional solid solution; 2, if difference is very greatly as C forms interstitial solid solution; 3, if difference is not very large, it can only be present in the grain boundary of iron, and boron is exactly such element, so as long as micro-boron will have influence on the performance relevant with crystalline grain of steel border, as hardening capacity; But boron and C, O, the elements such as N are very easy to form the compound of boron, and they are very crisp, so the control of boron content is bad, can gather in grain boundary the frangible compounds of boron, form boron crisp.Therefore how to add boron, control the content of boron, improve effective boron content is the most important problem of refining boron steel always, during general smelting boron steel, all, adding the solid N of Ti after deoxidation completely, then adds B.
Summary of the invention:
The object of this invention is to provide with boric acid and do the method that additive is made crucible induction furnace, it can increase the boron content in first steel-making water, can save 80% boron containing gold, has reduced product cost, has improved the quality of production.
In order to solve the existing problem of background technology, the present invention is by the following technical solutions: its making method: a, crucible material: SO in quartz sand
2content should be greater than 98%, AL
2o
3, CaO and Fe
2o
3should be lower than 1.5% Deng foreign matter content, water content≤0.5%, the proportioning of quartz sand size is 0-0.1mm accounts for 25%, 0.1-1mm and accounts for 10%, 1-5mm and account for 20%, 5-20mm and account for 25%, 20-40mm and account for 20%; B, sand grains at different levels are prepared in proportion to the boric acid mixing and stirring of adding 0.8-1.5%; C, knotting time-division furnace bottom, furnace wall and fire door three part knottings, during knotting furnace bottom, will divide 3-4 to criticize sand material ties a knot, must not eminence feed intake, prevent particle segregation, often accomplish fluently one deck, surperficial sand material to be drawn to pine with drill rod, add next batch, every layer of knotting time 20-30 minute, during knotting furnace wall again, every batch of feeding thickness is controlled at 30-50mm, during knotting, prevent flue skew, every layer of knotting time is controlled at 20-30 minute, during fire door knotting, should suitably add segment glass water to make binding agent, be convenient to moulding; D, while getting flue after accomplishing fluently, prevent crackle, during the first stove sintering, adopt small-sized scrap, slowly heat up, prevent from scratching furnace wall, after the first stove sinters, just can normally use.
The making method of described crucible induction furnace adopts the method for forming in stove, and its knotting method adopts dry method knotting.
Described crucible induction furnace, when making, need to add Boric Additive, and boric acid thermal dehydration is transformed into B
2o
3, B in steelmaking process
2o
3with the C in steel, Si, the elements such as Al interact, make B2O3 reduction, can increase the boron content in steel, so just total B content of stove molten steel just reaches 0.001%-0.002%, the molten boron content of acid reaches 0.0003%-0.0008%, as long as add micro-boron alloy when the refining of LF stove, save boron alloy 80% left and right, and needn't add the solid N of Ti.
The present invention is when smelting containing B spring steel 28MnSiB, its total B content is 0.0035%, the molten B of acid is 0.002%, reached nearly 60%, the 60Si2Mn smelting, its total B content also can reach 0.001%, the molten B content of acid can reach about 0.0002%-0.0005%, so spring steel 60Si2Mn hardening capacity is very good, its specification is that to reach HRC55-HRC57 metallographic structure be cryptocrystalline martensite to its quenching hardness of 16*90mm, and the thickness of general 60Si2Mn energy through hardening only has 12mm-13mm, when other steel grade of refining, also can increase the remaining B content of made steel base, thereby improve the performance of the base of making steel.
The present invention can increase the boron content in first steel-making water, can save 80% boron containing gold, has reduced product cost, has improved the quality of production.
Embodiment:
This embodiment is by the following technical solutions: its making method: a, crucible material: SO in quartz sand
2content should be greater than 98%, AL
2o
3, CaO and Fe
2o
3should be lower than 1.5% Deng foreign matter content, water content≤0.5%, the proportioning of quartz sand size is 0-0.1mm accounts for 25%, 0.1-1mm and accounts for 10%, 1-5mm and account for 20%, 5-20mm and account for 25%, 20-40mm and account for 20%; B, sand grains at different levels are prepared in proportion to the boric acid mixing and stirring of adding 0.8-1.5%; C, knotting time-division furnace bottom, furnace wall and fire door three part knottings, during knotting furnace bottom, will divide 3-4 to criticize sand material ties a knot, must not eminence feed intake, prevent particle segregation, often accomplish fluently one deck, surperficial sand material to be drawn to pine with drill rod, add next batch, every layer of knotting time 20-30 minute, during knotting furnace wall again, every batch of feeding thickness is controlled at 30-50mm, during knotting, prevent flue skew, every layer of knotting time is controlled at 20-30 minute, during fire door knotting, should suitably add segment glass water to make binding agent, be convenient to moulding; D, while getting flue after accomplishing fluently, prevent crackle, during the first stove sintering, adopt small-sized scrap, slowly heat up, prevent from scratching furnace wall, after the first stove sinters, just can normally use.
The making method of described crucible induction furnace adopts the method for forming in stove, and its knotting method adopts dry method knotting.
Described crucible induction furnace, when making, need to add Boric Additive, and boric acid thermal dehydration is transformed into B
2o
3, B in steelmaking process
2o
3with the C in steel, Si, the elements such as Al interact, make B2O3 reduction, can increase the boron content in steel, so just total B content of stove molten steel just reaches 0.001%-0.002%, the molten boron content of acid reaches 0.0003%-0.0008%, as long as add micro-boron alloy when the refining of LF stove, save boron alloy 80% left and right, and needn't add the solid N of Ti.
This embodiment is when smelting containing B spring steel 28MnSiB, its total B content is 0.0035%, the molten B of acid is 0.002%, reached nearly 60%, the 60Si2Mn smelting, its total B content also can reach 0.001%, the molten B content of acid can reach about 0.0002%-0.0005%, so spring steel 60Si2Mn hardening capacity is very good, its specification is that to reach HRC55-HRC57 metallographic structure be cryptocrystalline martensite to its quenching hardness of 16*90mm, and the thickness of general 60Si2Mn energy through hardening only has 12mm-13mm, when other steel grade of refining, also can increase the remaining B content of made steel base, thereby improve the performance of the base of making steel.
This embodiment can increase the boron content in first steel-making water, can save 80% boron containing gold, has reduced product cost, has improved the quality of production.
Claims (2)
1. with boric acid, do the method that additive is made crucible induction furnace, it is characterized in that its making method: (a), crucible material: SO in quartz sand
2content should be greater than 98%, AL
2o
3, CaO and Fe
2o
3should be lower than 1.5% Deng foreign matter content, water content≤0.5%, the proportioning of quartz sand size is 0-0.1mm accounts for 25%, 0.1-1mm and accounts for 10%, 1-5mm and account for 20%, 5-20mm and account for 25%, 20-40mm and account for 20%; (b), sand grains at different levels are prepared in proportion to the boric acid mixing and stirring of adding 0.8-1.5%; (c), knotting time-division furnace bottom, furnace wall and fire door three part knottings, during knotting furnace bottom, will divide 3-4 to criticize sand material ties a knot, must not eminence feed intake, prevent particle segregation, often accomplish fluently one deck, surperficial sand material to be drawn to pine with drill rod, add next batch, every layer of knotting time 20-30 minute, during knotting furnace wall again, every batch of feeding thickness is controlled at 30-50mm, during knotting, prevent flue skew, every layer of knotting time is controlled at 20-30 minute, during fire door knotting, should suitably add segment glass water to make binding agent, be convenient to moulding; (d), while getting flue after accomplishing fluently, prevent crackle, during the first stove sintering, adopt small-sized scrap, slowly heat up, prevent from scratching furnace wall, after the first stove sinters, just can normally use.
2. the method for making additive making crucible induction furnace of boric acid according to claim 1, is characterized in that the making method of described crucible induction furnace adopts the method for forming in stove, and its knotting method adopts dry method to tie a knot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210353832.2A CN103663938A (en) | 2012-09-21 | 2012-09-21 | Method for manufacturing induction furnace crucible by taking boric acid as additive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210353832.2A CN103663938A (en) | 2012-09-21 | 2012-09-21 | Method for manufacturing induction furnace crucible by taking boric acid as additive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103663938A true CN103663938A (en) | 2014-03-26 |
Family
ID=50302841
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210353832.2A Pending CN103663938A (en) | 2012-09-21 | 2012-09-21 | Method for manufacturing induction furnace crucible by taking boric acid as additive |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0616494A (en) * | 1991-02-08 | 1994-01-25 | Toshiba Ceramics Co Ltd | Quartz glass crucible and its production |
| CN101628782A (en) * | 2009-07-29 | 2010-01-20 | 陈新源 | High-purity silica pot and production method thereof |
| CN102127806A (en) * | 2010-10-28 | 2011-07-20 | 杭州先进石英材料有限公司 | Quartz glass crucible and preparation method thereof |
| CN102617164A (en) * | 2012-03-28 | 2012-08-01 | 南车戚墅堰机车车辆工艺研究所有限公司 | Acid lining material of medium-frequency induction furnace and furnace building method thereof |
-
2012
- 2012-09-21 CN CN201210353832.2A patent/CN103663938A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0616494A (en) * | 1991-02-08 | 1994-01-25 | Toshiba Ceramics Co Ltd | Quartz glass crucible and its production |
| CN101628782A (en) * | 2009-07-29 | 2010-01-20 | 陈新源 | High-purity silica pot and production method thereof |
| CN102127806A (en) * | 2010-10-28 | 2011-07-20 | 杭州先进石英材料有限公司 | Quartz glass crucible and preparation method thereof |
| CN102617164A (en) * | 2012-03-28 | 2012-08-01 | 南车戚墅堰机车车辆工艺研究所有限公司 | Acid lining material of medium-frequency induction furnace and furnace building method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Application publication date: 20140326 |