CN103551555A - Roasting method for permanent layer of steel-making tundish after overhauling - Google Patents
Roasting method for permanent layer of steel-making tundish after overhauling Download PDFInfo
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- CN103551555A CN103551555A CN201310558767.1A CN201310558767A CN103551555A CN 103551555 A CN103551555 A CN 103551555A CN 201310558767 A CN201310558767 A CN 201310558767A CN 103551555 A CN103551555 A CN 103551555A
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Abstract
The invention relates to a roasting method for a permanent layer of a steel-making tundish after overhauling, which comprises the following steps: removing the free water in the permanent layer after overhauling the tundish at 100-200 DEG C; removing the crystal water from the permanent layer at 300-400 DEG C; evenly heating the permanent layer at 600-700 DEG C; roasting the permanent layer at a temperature range from 700 DEG C to 800 DEG C; and naturally cooling to the room temperature and standing by. According to the roasting method provided by the invention, the permanent layer of the tundish is subjected to a crystal water removing stage, so that the surface of the permanent layer is smooth and flat and is free from obvious crack; after the permanent layer is roasted, the phenomena of bigger crack, layer cracking and falling do not exist; the anti-cracking ability is excellent; and the high-temperature bending strength is more than or equal to 10MPa, so that the service cycle of the permanent layer is increased to at least 150 pouring periods from the original 120 pouring periods.
Description
Technical field
The present invention relates to a kind ofly to the heating of object or baking method, belong to particularly a kind of baking method of making steel after the overhaul of tundish permanent layer.
Background technology
Through the tundish permanent layer of overhaul cast, must reach technological requirement through overbaking could use.At present, the tundish permanent layer baking stage mainly comprises three phases: 1) low thermophase, is warming up to about 300 ℃ and gets rid of tundish permanent layer free water; 2) thermophase in, is warming up to 500 ~ 600 ℃, to get rid of the tundish permanent layer crystallization water; 3) soaking period, tundish permanent layer is through soaking, and to guarantee the abundant sintering of permanent layer castable, materials'use performance is guaranteed;
Before the present invention, the baking method of the tundish permanent layer of pouring into a mould through overhaul is: first casting lining is checked, check the smooth situation of smooth surface, whether have or not obvious crackle; Then cover pouring basket lid, winch to baking table; According to the baking method of front described three phases, toast again.After the baking of 168 hours, often there is large crackle, slabbing obscission in permanent layer, causes tundish low service life, and tundish turnover is used running to have hidden danger.
The reason that its subject matter produces is by analysis:
The one, due to too high in the temperature (300 ℃ of left and right) of low thermophase eliminating free water.Tundish permanent layer refractory material is at the baking initial stage, too fast if heated up, excess Temperature, the water vapour of assembling tundish permanent layer lining body inside has little time to get rid of, permanent layer lining body internal vapor pressure is raise, the ultimate strength that has surpassed material, causes being parallel to slabbing and the surfacial spalling of working face;
The 2nd, because the temperature of the crystallization water in middle thermophase eliminating permanent layer is higher, reach 500 ~ 600 ℃.According to the actual draining field observation of the tundish permanent layer crystallization water, the crystallization water was discharged substantially before 400 ℃.Reality, in the soaking baking stage, not only wastes energy, and because crystallization water efflux time is short, causes being equally parallel to slabbing and the surfacial spalling of working face, unfavorable to permanent layer baking quality.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of tundish permanent layer after overbaking, to there will not be the larger crackle of width >=5mm, the degree of depth >=5mm, length >=500mm, cracking resistance high temperature break resistant intensity >=10MPa, can improve permanent layer life cycle and be not less than the baking method after 20% steel-making tundish permanent layer overhaul.
Realize the measure of above-mentioned purpose:
Baking method after the overhaul of steel-making tundish permanent layer, its step:
1) the free water stage in permanent layer after the overhaul of eliminating tundish: first the tundish permanent layer after overhaul is heated to 100 ~ 200 ℃, and its programming rate is controlled at 0.15 ~ 0.39 ℃/min, and the heating-up time is controlled at 7 ~ 9 hours; And insulation is not less than 48 hours at 100 ~ 200 ℃; Control free moisture weight percent content and be no more than 0.5%;
2) slough the crystallization water stage in permanent layer: at programming rate, be temperature to be risen to 300 ~ 400 ℃ under 0.37 ~ 0.48 ℃/min, the heating-up time is controlled at 7 ~ 9 hours; At 300 ~ 400 ℃, insulation is not less than 48 hours; Crystallization control moisture weight percent content is no more than 0.3%;
3) permanent layer is carried out to the soaking stage: at programming rate, be temperature to be risen to 600 ~ 700 ℃ under 0.56 ~ 0.72 ℃/min, the heating-up time is controlled at 7 ~ 9 hours; At 600 ~ 700 ℃, insulation is not less than 48 hours;
4) permanent layer is carried out to the baking stage: continue heating, in 4 hours, raise the temperature to and be greater than 700 ℃ to 800 ℃, and baking is not less than 8 hours under this high temperature;
5) naturally cool to room temperature, stand-by.
The present invention compared with prior art, tundish permanent layer is through getting rid of the crystallization water stage, permanent layer smooth surface is smooth, without obvious crackle, there is larger crackle, slabbing obscission in nothing after baking, cracking resistance is good, and high temperature break resistant intensity >=10MPa makes permanent layer life cycle by originally using 120 to water time cycle and bring up to and be no less than 150 and water time cycle.
The specific embodiment
Below the present invention is described in detail:
Embodiment 1
Baking method after the overhaul of 300 tons of pneumatic steelmaking tundish permanent layer, its step:
1) the free water stage in permanent layer after the overhaul of eliminating tundish: the tundish permanent layer after overhaul is 16 ℃ from room temperature and is heated to 110 ℃, it is 0.2 ℃/min that its programming rate is controlled, and the heating-up time is 470 minutes; And 48.5 hours have been incubated at 110 ℃; Free water weight percent content is 0.31%;
2) slough the crystallization water stage in permanent layer: at programming rate, be temperature to be risen to 330 ℃ under 0.45 ℃/min, the heating-up time is 489 minutes; At 330 ℃, temperature retention time is 49.5 hours; Crystallization water weight percent content is 0.12%;
3) permanent layer is carried out to the soaking stage: at programming rate, be temperature to be risen to 635 ℃ under 0.68 ℃/min, the heating-up time is 450 minutes; At 635 ℃, temperature retention time is 48 hours;
4) permanent layer is carried out to the baking stage: continue heating, within 3.5 hours, be heated to 720 ℃, and toast 8.1 hours under this high temperature;
5) naturally cool to room temperature, stand-by.
After testing, tundish permanent layer is through getting rid of the crystallization water stage, permanent layer smooth surface is smooth, without obvious crackle, after baking, the width of maximum crackle is 4.8mm, and the degree of depth is 4.2 mm, do not split obscission, rupture strength is 15MPa, and cracking resistance is good, and permanent layer life cycle is 151 and waters inferior.
Embodiment 2
Baking method after the overhaul of 250 tons of pneumatic steelmaking tundish permanent layer, its step:
1) the free water stage in permanent layer after the overhaul of eliminating tundish: the tundish permanent layer after overhaul is 23 ℃ from room temperature and is heated to 150 ℃, it is 0.25 ℃/min that its programming rate is controlled, and the heating-up time is 508 minutes; And 48.5 hours have been incubated at 150 ℃; Free water weight percent content is 0.42%;
2) slough the crystallization water stage in permanent layer: at programming rate, be temperature to be risen to 345 ℃ under 0.37 ℃/min, the heating-up time is 527 minutes; At 345 ℃, temperature retention time is 49 hours; Crystallization water weight percent content is 0.16%;
3) permanent layer is carried out to the soaking stage: at programming rate, be temperature to be risen to 600 ℃ under 0.56 ℃/min, the heating-up time is 455 minutes; At 600 ℃, temperature retention time is 49.5 hours;
4) permanent layer is carried out to the baking stage: continue heating, within 4 hours, be heated to 750 ℃, and toast 8 hours under this high temperature;
5) naturally cool to room temperature, stand-by.
After testing, tundish permanent layer is through getting rid of the crystallization water stage, permanent layer smooth surface is smooth, without obvious crackle, after baking, the width of maximum crackle is 3.2mm, and the degree of depth is 4.3 mm, do not split obscission, rupture strength intensity is 15.1MPa, and cracking resistance is good, and permanent layer life cycle is 158 and waters inferior.
Embodiment 3
Baking method after the overhaul of 300 tons of pneumatic steelmaking tundish permanent layer, its step:
1) the free water stage in permanent layer after the overhaul of eliminating tundish: the tundish permanent layer after overhaul is 28 ℃ from room temperature and is heated to 195 ℃, it is 0.35 ℃/min that its programming rate is controlled, and the heating-up time is 477 minutes; And 48.5 hours have been incubated at 195 ℃; Free water weight percent content is 0.2%;
2) slough the crystallization water stage in permanent layer: at programming rate, be temperature to be risen to 360 ℃ under 0.39 ℃/min, the heating-up time is 423 minutes; At 360 ℃, temperature retention time is 48.2 hours; Crystallization water weight percent content is 0.18%;
3) permanent layer is carried out to the soaking stage: at programming rate, be temperature to be risen to 660 ℃ under 0. 6 ℃/min, the heating-up time is 423 minutes; At 660 ℃, temperature retention time is 48.6 hours;
4) permanent layer is carried out to the baking stage: continue heating, within 3.8 hours, be heated to 780 ℃, and toast 8.5 hours under this high temperature;
5) naturally cool to room temperature, stand-by.
After testing, tundish permanent layer is through getting rid of the crystallization water stage, permanent layer smooth surface is smooth, without obvious crackle, after baking, the width of maximum crackle is 2.8mm, and the degree of depth is 3.3 mm, do not split obscission, rupture strength intensity is 15.8MPa, and cracking resistance is good, and permanent layer life cycle is 163 and waters inferior.
Embodiment 4
Baking method after the overhaul of 250 tons of pneumatic steelmaking tundish permanent layer, its step:
1) the free water stage in permanent layer after the overhaul of eliminating tundish: the tundish permanent layer after overhaul is 26 ℃ from room temperature and is heated to 185 ℃, it is 0.39 ℃/min that its programming rate is controlled, and the heating-up time is 459 minutes; And 48.2 hours have been incubated at 185 ℃; Free water weight percent content is 0.21%;
2) slough the crystallization water stage in permanent layer: at programming rate, be temperature to be risen to 400 ℃ under 0.48 ℃/min, the heating-up time is 448 minutes; At 400 ℃, temperature retention time is 48 hours; Crystallization water weight percent content is 0.15%;
3) permanent layer is carried out to the soaking stage: at programming rate, be temperature to be risen to 650 ℃ under 0. 58 ℃/min, the heating-up time is 431 minutes; At 650 ℃, temperature retention time is 48.5 hours;
4) permanent layer is carried out to the baking stage: continue heating, within 3.2 hours, be heated to 715 ℃, and toast 8.3 hours under this high temperature;
5) naturally cool to room temperature, stand-by.
After testing, tundish permanent layer is through getting rid of the crystallization water stage, permanent layer smooth surface is smooth, without obvious crackle, after baking, the width of maximum crackle is 2.7mm, and the degree of depth is 2.6mm, do not split obscission, rupture strength intensity is 14.5MPa, and cracking resistance is good, and permanent layer life cycle is 160 and waters inferior.
Embodiment 5
Baking method after the overhaul of 300 tons of pneumatic steelmaking tundish permanent layer, its step:
1) the free water stage in permanent layer after the overhaul of eliminating tundish: the tundish permanent layer after overhaul is 22 ℃ from room temperature and is heated to 135 ℃, it is 0.22 ℃/min that its programming rate is controlled, and the heating-up time is 477 minutes; And 49 hours have been incubated at 135 ℃; Free water weight percent content is 0.16%;
2) slough the crystallization water stage in permanent layer: at programming rate, be temperature to be risen to 375 ℃ under 0.46/ minute, the heating-up time is 515 minutes; At 375 ℃, temperature retention time is 48.8 hours; Crystallization water weight percent content is 0.1%;
3) permanent layer is carried out to the soaking stage: at programming rate, be temperature to be risen to 700 ℃ under 0. 72 ℃/min, the heating-up time is 451 minutes; At 700 ℃, temperature retention time is 48.2 hours;
4) permanent layer is carried out to the baking stage: continue heating, within 3 hours, be heated to 800 ℃, and toast 8 hours under this high temperature;
5) naturally cool to room temperature, stand-by.
After testing, tundish permanent layer is through getting rid of the crystallization water stage, permanent layer smooth surface is smooth, without obvious crackle, after baking, the width of maximum crackle is 2.2mm, and the degree of depth is 2.9mm, do not split obscission, rupture strength intensity is 15.9MPa, and cracking resistance is good, and permanent layer life cycle is 168 and waters inferior.
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (1)
1. the baking method of making steel after the overhaul of tundish permanent layer, its step:
1) the free water stage in permanent layer after the overhaul of eliminating tundish: first the tundish permanent layer after overhaul is heated to 100 ~ 200 ℃, and its programming rate is controlled at 0.15 ~ 0.39 ℃/min, and the heating-up time is controlled at 7 ~ 9 hours; And insulation is not less than 48 hours at 100 ~ 200 ℃; Control free moisture weight percent content and be no more than 0.5%;
2) slough the crystallization water stage in permanent layer: at programming rate, be temperature to be risen to 300 ~ 400 ℃ under 0.37 ~ 0.48 ℃/min, the heating-up time is controlled at 7 ~ 9 hours; At 300 ~ 400 ℃, insulation is not less than 48 hours; Crystallization control moisture weight percent content is no more than 0.3%;
3) permanent layer is carried out to the soaking stage: at programming rate, be temperature to be risen to 600 ~ 700 ℃ under 0.56 ~ 0.72 ℃/min, the heating-up time is controlled at 7 ~ 9 hours; At 600 ~ 700 ℃, insulation is not less than 48 hours;
4) permanent layer is carried out to the baking stage: continue heating, in 4 hours, raise the temperature to and be greater than 700 ℃ to 800 ℃, and baking is not less than 8 hours under this high temperature;
5) naturally cool to room temperature, stand-by.
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| CN201310558767.1A CN103551555B (en) | 2013-11-12 | 2013-11-12 | Baking method after the overhaul of steel-making tundish permanent layer |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52100328A (en) * | 1976-02-20 | 1977-08-23 | Meiwa Kagaku Kogyo | Inner lining material of tundish |
| CN102554201A (en) * | 2012-01-05 | 2012-07-11 | 济南钢铁集团耐火材料有限责任公司 | Large steel ladle and manufacturing method for same |
| CN102672154A (en) * | 2012-04-17 | 2012-09-19 | 莱芜钢铁集团有限公司 | Continuous-casting tundish comprehensive permanent liner and preparation method thereof |
| CN103252486A (en) * | 2013-05-13 | 2013-08-21 | 莱芜钢铁集团有限公司 | Knockout method of pouring ladle permanent layer |
-
2013
- 2013-11-12 CN CN201310558767.1A patent/CN103551555B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52100328A (en) * | 1976-02-20 | 1977-08-23 | Meiwa Kagaku Kogyo | Inner lining material of tundish |
| CN102554201A (en) * | 2012-01-05 | 2012-07-11 | 济南钢铁集团耐火材料有限责任公司 | Large steel ladle and manufacturing method for same |
| CN102672154A (en) * | 2012-04-17 | 2012-09-19 | 莱芜钢铁集团有限公司 | Continuous-casting tundish comprehensive permanent liner and preparation method thereof |
| CN103252486A (en) * | 2013-05-13 | 2013-08-21 | 莱芜钢铁集团有限公司 | Knockout method of pouring ladle permanent layer |
Non-Patent Citations (3)
| Title |
|---|
| 唐兴智: "浇注料炉衬烘炉"放爆"现象分析", 《鞍钢技术》 * |
| 喻钟义: "提高75t盛钢桶桶衬寿命的研究", 《四川冶金》 * |
| 李学良等: "连铸中间包永久衬的整体浇注", 《宽厚板》 * |
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Effective date of registration: 20170711 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |