CN102022922B - Manufacturing method for prolonging service life of KR stirrer - Google Patents
Manufacturing method for prolonging service life of KR stirrer Download PDFInfo
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- CN102022922B CN102022922B CN201010575085A CN201010575085A CN102022922B CN 102022922 B CN102022922 B CN 102022922B CN 201010575085 A CN201010575085 A CN 201010575085A CN 201010575085 A CN201010575085 A CN 201010575085A CN 102022922 B CN102022922 B CN 102022922B
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- stirrer
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Abstract
The invention discloses a manufacturing method for prolonging the service life of a KR stirrer, specifically comprising the steps of: selecting a steel core, removing impurities on the surface of the steel core, washing and cleaning the steel core, and airing; welding a group of riveting pieces with different heights ranging from 30mm to 80mm on the surface of the steel core; covering a refractory fiber material layer with the thickness of 0-50mm on the surface of the steel core, coating a castable layer with the thickness of 60-120mm on the refractory fiber material layer, and baking the entire device for 36-60h at the temperature of 80-100 DEG C; and continuously heating the baked device to ensure that the temperature reaches 320-350 DEG C, and maintaining the temperature for 8-16h. The method is simple and energy-saving, and the used materials are not molten at high temperature and can stop the heat from being transmitted to the steel core, therefore, not only is the expansion degree of the steel core alleviated, but also the extrusion stress generated due to the expansion of the steel core can be effectively buffered so that the quantity of the cracks generated after the KR stirrer is baked can be reduced to the minimum.
Description
Technical field
The invention belongs to the metal smelt field, be specifically related to a kind of KR of the raising agitator preparation method in service life.
Background technology
KR stirring desulphurization method is that Japanese Nippon Steel literary composition field system iron began one's study in 1963, and nineteen sixty-five is applied to industrial a kind of external desulfurization of hot metal technology.Characteristics such as this sulfur method has the desulfuration efficiency height, and sorbent consumption is few, and the activity duration is short, and the low and refractory consumption rate of metal consume is low.The seventies in last century, China's Wuhan Iron and Steel Plant is introduced KR stirring desulphurization technology from Japanese Nippon Steel, and other domestic enterprise is the introduction or the KR stirring desulphurization production line of designing and preparing in succession voluntarily also, has opened up the new frame of China's desulfurizing iron technical development.
The KR agitator is comparatively harsh because of service condition, improves its service life and be always one of subject matter that the metallargist pays close attention to.Except the quality of pours, the preparation technology of KR agitator also is the principal element that influences its service life.In the preparation process of KR agitator, the most unmanageable is how to subdue the extruding internal stress that thermal dilation difference causes between two kinds of materials of agitator complex in the bake process (pours and steel core); The extruding force of KR agitator Chang Yingang core in bake process the crackle that thickness differs occurs on pours inside and surface, and during one's term of military service, molten iron is invaded material interface through crackle and caused the pours bulk to come off, and causes the KR agitator to scrap in advance.
In order to improve this phenomenon; Having taked some measures, as wrapping one in steel core surface to which floor plastic material, further is to smear one deck buffer coat on the surface; These measures have been played certain effect to reducing stress difference; But at high temperature, these materials are mobile because of melting, and cushioning effect is restricted.
Therefore, be badly in need of providing a kind of and can effectively improve the KR agitator preparation method in service life.
Summary of the invention
Goal of the invention: the objective of the invention is to the deficiency to prior art, provide a kind of easy, energy-conservation, effectively improve the KR agitator preparation method in service life.
Technical scheme: a kind of KR agitator preparation method in service life that improves provided by the invention may further comprise the steps:
(1) chooses steel core,, dry after rinsing well its surperficial impurity elimination;
(2) welding one group of riveting component that height is different in steel core surface, highly is 30～80mm;
(3) be covered with the thick refractory fibrous material of one deck 0～50mm in steel core surface;
(4) fix mould in the steel core periphery, in mould, inject pours, pours is thick to be 60～120mm, at room temperature is placed to the pours sclerosis after the completion, removes mould continued maintenance 48～72h;
(5) after maintenance finished, with whole device baking 36～60h, temperature was 100～150 ℃;
(6) continue the device that toasted is heated, make temperature reach 320～350 ℃, continue 8～16h.
Wherein, said refractory fibrous material is that density is 190～280kg/m
3, thermal conductivity factor is 0.085 (400 ℃) W/m.k, serviceability temperature reaches 1400 ℃.
Wherein, pours is 50～80% Al by percentage by weight
2O
3, 20～45% SiO
2Form with 0～5% CaO.
Beneficial effect: the inventive method is simple, energy-conservation; The material that uses at high temperature can not melt; And can stop heat to the steel core transmission; Both alleviated the degrees of expansion of steel core, and can effectively cushion the extrusion stress that the invar core expands and produces again, and made the crack number after the KR agitator toasts to reduce to minimum.
The specific embodiment:
Embodiment 1:
At first choose steel core,, dry after rinsing well its surperficial impurity elimination; Welding one group of riveting component that height is different in steel core surface, highly is 30～40mm; Be covered with the thick refractory fibrous material of one deck 20mm in steel core surface, this refractory fibrous material density is 200kg/m
3, thermal conductivity factor reaches 1200 ℃ for the 0.085W/m.k serviceability temperature; On the refractory fibrous material layer, be coated with one deck pours, pours thickness is 60～80mm; After coating pours, with whole device baking 48h, temperature is 115 ℃; Continuation is heated to the device that toasted, and makes temperature reach 350 ℃, continues 14h.
Embodiment 2:
At first choose steel core,, dry after rinsing well its surperficial impurity elimination; Welding one group of riveting component that height is different in steel core surface, highly is 40～50mm; Be covered with the thick refractory fibrous material of one deck 10mm in steel core surface, this refractory fibrous material density is 280kg/m
3, thermal conductivity factor is 0.085W/m.k, serviceability temperature reaches 1300 ℃; On the refractory fibrous material layer, be coated with one deck pours, thickness is 60～100mm; After coating pours, with whole device baking 60h, temperature is 135 ℃; Continuation is heated to the device that toasted, and makes temperature reach 340 ℃, continues 12h.
Embodiment 3:
At first choose steel core,, dry after rinsing well its surperficial impurity elimination; Welding one group of riveting component that height is different in steel core surface, highly is 60～70mm; Be covered with the thick refractory fibrous material of one deck 50mm in steel core surface, this refractory fibrous material density is 190kg/m
3, thermal conductivity factor reaches 1400 ℃ for the 0.085W/m.k serviceability temperature; On the refractory fibrous material layer, be coated with one deck pours, thickness is 90～110mm; After coating pours, with whole device baking 60h, temperature is 150 ℃; Continuation is heated to the device that toasted, and makes temperature reach 320 ℃, continues 8h.
Claims (1)
1. one kind is improved the KR agitator preparation method in service life, it is characterized in that it may further comprise the steps:
(1) chooses steel core,, dry after rinsing well its surperficial impurity elimination;
(2) welding one group of riveting component that height is different in steel core surface, highly is 30～80mm;
(3) be covered with the thick refractory fibrous material of one deck 0～50mm in steel core surface, the density of said refractory fibrous material is 190～280kg/m
3, thermal conductivity factor is 0.085W/mk, serviceability temperature reaches 1400 ℃;
(4) fix mould in the steel core periphery, in mould, inject pours, pours is thick to be 60～120mm, at room temperature is placed to the pours sclerosis after the completion, removes mould continued maintenance 48～72h, and said pours is 50～80% Al by percentage by weight
2O
3, 20～45% SiO
2Form with 0～5% CaO;
(5) after maintenance finished, with whole device baking 36～60h, temperature was 100～150 ℃;
(6) continue the device that toasted is heated, make temperature reach 320～350 ℃, continue 8～16h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010575085A CN102022922B (en) | 2010-12-07 | 2010-12-07 | Manufacturing method for prolonging service life of KR stirrer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010575085A CN102022922B (en) | 2010-12-07 | 2010-12-07 | Manufacturing method for prolonging service life of KR stirrer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102022922A CN102022922A (en) | 2011-04-20 |
| CN102022922B true CN102022922B (en) | 2012-09-05 |
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| CN201010575085A Active CN102022922B (en) | 2010-12-07 | 2010-12-07 | Manufacturing method for prolonging service life of KR stirrer |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108203750A (en) * | 2016-12-20 | 2018-06-26 | 宝山钢铁股份有限公司 | Desulfurization agitating paddle |
| CN108608566A (en) * | 2018-05-31 | 2018-10-02 | 中冶南方工程技术有限公司 | KR desulfurization blenders make integrated system and production method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2771218Y (en) * | 2005-03-22 | 2006-04-12 | 朱金良 | Iron melt desulfurizing stirring head |
| CN2923725Y (en) * | 2006-03-07 | 2007-07-18 | 武汉钢铁(集团)公司 | Novel KR desulfurizing agitator |
| CN100351209C (en) * | 2005-11-03 | 2007-11-28 | 武汉钢铁(集团)公司 | Refractory pouring material used for melten iron desulfur agitator |
| CN201031236Y (en) * | 2007-04-26 | 2008-03-05 | 武汉钢铁(集团)公司 | Molten iron desulfurize agitator head |
| CN101603111B (en) * | 2009-02-17 | 2010-08-18 | 武汉钢铁(集团)公司 | Stirrer for desulphurization of molten iron |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5412927B2 (en) * | 2009-04-03 | 2014-02-12 | 新日鐵住金株式会社 | Slag adhesion control method for smelting container refractories |
-
2010
- 2010-12-07 CN CN201010575085A patent/CN102022922B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2771218Y (en) * | 2005-03-22 | 2006-04-12 | 朱金良 | Iron melt desulfurizing stirring head |
| CN100351209C (en) * | 2005-11-03 | 2007-11-28 | 武汉钢铁(集团)公司 | Refractory pouring material used for melten iron desulfur agitator |
| CN2923725Y (en) * | 2006-03-07 | 2007-07-18 | 武汉钢铁(集团)公司 | Novel KR desulfurizing agitator |
| CN201031236Y (en) * | 2007-04-26 | 2008-03-05 | 武汉钢铁(集团)公司 | Molten iron desulfurize agitator head |
| CN101603111B (en) * | 2009-02-17 | 2010-08-18 | 武汉钢铁(集团)公司 | Stirrer for desulphurization of molten iron |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2010-242148A 2010.10.28 |
| 欧阳德刚等.KR脱硫搅拌器长寿命综合技术的研究与应用.《炼钢》.2009,第25卷(第6期),全文. * |
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| CN102022922A (en) | 2011-04-20 |
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Effective date of registration: 20180408 Address after: Dingshuzhen Ceramic Industrial Park Lake Road Yixing city 214221 Jiangsu city of Wuxi Province Patentee after: YIXING RUIHUA INDUSTRIAL FURNACE SCIENCE & TECHNOLOGY CO., LTD. Address before: Yixing Dingshu 214221 Jiangsu city of Wuxi province Zhao village Dongpo Road No. 58 Patentee before: Yixing Ruihua New Type Burden Factory |
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Denomination of invention: A method to improve the service life of Kr agitator Effective date of registration: 20210402 Granted publication date: 20120905 Pledgee: Yixing sub branch of Bank of China Limited Pledgor: YIXING RUIHUA INDUSTRY FURNACE TECHNOLOGY Co.,Ltd. Registration number: Y2021320010117 |