CN103551555B - Baking method after the overhaul of steel-making tundish permanent layer - Google Patents
Baking method after the overhaul of steel-making tundish permanent layer Download PDFInfo
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- CN103551555B CN103551555B CN201310558767.1A CN201310558767A CN103551555B CN 103551555 B CN103551555 B CN 103551555B CN 201310558767 A CN201310558767 A CN 201310558767A CN 103551555 B CN103551555 B CN 103551555B
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- tundish
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000009628 steelmaking Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000002425 crystallisation Methods 0.000 claims abstract description 27
- 230000008025 crystallization Effects 0.000 claims abstract description 27
- 238000002791 soaking Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 6
- 208000037656 Respiratory Sounds Diseases 0.000 abstract description 17
- 238000005336 cracking Methods 0.000 abstract description 8
- 230000014759 maintenance of location Effects 0.000 description 10
- 239000003643 water by type Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 2
- 238000004901 spalling Methods 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
Baking method after the overhaul of steel-making tundish permanent layer: get rid of the free water in permanent layer after tundish overhaul at 100 ~ 200 DEG C; The crystallization water in permanent layer is sloughed at 300 ~ 400 DEG C; At 600 ~ 700 DEG C, soaking is carried out to permanent layer; To 800 DEG C, permanent layer is toasted being greater than 700 DEG C; Naturally cool to room temperature, stand-by.The present invention passes through in tundish permanent layer and gets rid of the crystallization water stage, permanent layer smooth surface is smooth, without obvious crackle, without occurring larger crackle, slabbing obscission after baking, cracking resistance is good, high temperature break resistant intensity >=10MPa, makes permanent layer life cycle bring up to and be no less than 150 by originally using 120 to water time cycle and water time cycle.
Description
Technical field
The present invention relates to a kind of heating to object or baking method, belong to a kind of baking method after the overhaul of tundish permanent layer of making steel particularly.
Background technology
Through the tundish permanent layer of overhaul cast, have to pass through baking and reach technological requirement and could use.At present, the tundish permanent layer baking stage mainly comprises three phases: 1) cold stage, is namely warming up to about 300 DEG C and gets rid of tundish permanent layer free water; 2) thermophase in, is namely warming up to 500 ~ 600 DEG C, to get rid of the tundish permanent layer crystallization water; 3) soaking period, tundish permanent layer is through soaking, and to ensure that permanent layer castable fully sinters, materials'use performance is guaranteed;
Before making the present invention, whether the baking method through the tundish permanent layer of overhaul cast is: first check casting lining, check smooth surface flat conditions, with or without obvious crackle; Then cover pouring basket lid, winch to baking table; Toast according to the baking method of front described three phases again.After the baking of 168 hours, often there is large crackle, slabbing obscission in permanent layer, causes tundish low for service life, and tundish turnover uses running to there is hidden danger.
Its subject matter Producing reason is by analysis:
One is due to too high in the temperature (about 300 DEG C) of cold stage eliminating free water.Tundish permanent layer refractory material is at the baking initial stage, too fast if heated up, temperature is too high, the water vapour then assembling tundish permanent layer lining body inside has little time to get rid of, make permanent layer serve as a contrast body internal vapor pressure to raise, exceed the ultimate strength of material, cause the slabbing and the surfacial spalling that are parallel to working face;
Two is because the temperature of the crystallization water in middle thermophase eliminating permanent layer is higher, namely reaches 500 ~ 600 DEG C.According to the actual draining field observation of the tundish permanent layer crystallization water, the crystallization water was discharged substantially before 400 DEG C.Actual be in soaking baking the stage, not only waste energy, and due to crystallization water efflux time short, cause the slabbing and the surfacial spalling that are parallel to working face equally, unfavorable to permanent layer baking quality.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, there is provided a kind of tundish permanent layer after overbaking, 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 be not less than the steel-making tundish permanent layer overhaul of 20% after baking method.
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 after the overhaul of eliminating tundish in permanent layer: first the tundish permanent layer after overhaul is heated to 100 ~ 200 DEG C, and its programming rate controls at 0.15 ~ 0.39 DEG C/min, and the heating-up time controls at 7 ~ 9 hours; And insulation is not less than 48 hours at 100 ~ 200 DEG C; Control free moisture weight percent content and be no more than 0.5%;
2) slough the crystallization water stage in permanent layer: under programming rate is 0.37 ~ 0.48 DEG C/min, temperature is risen to 300 ~ 400 DEG C, the heating-up time controls at 7 ~ 9 hours; At 300 ~ 400 DEG C, insulation is not less than 48 hours; Crystallization control moisture weight degree is no more than 0.3%;
3) carry out the soaking stage to permanent layer: under programming rate is 0.56 ~ 0.72 DEG C/min, temperature is risen to 600 ~ 700 DEG C, the heating-up time controls at 7 ~ 9 hours; At 600 ~ 700 DEG C, insulation is not less than 48 hours;
4) carried out to permanent layer the baking stage: continue heating, raised the temperature in 4 hours and be greater than 700 DEG C to 800 DEG C, and baking is not less than 8 hours at these elevated temperatures;
5) room temperature is naturally cooled to, 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, without occurring larger crackle, slabbing obscission after baking, cracking resistance is good, high temperature break resistant intensity >=10MPa, makes permanent layer life cycle bring up to and be no less than 150 by originally using 120 to water time cycle and water time cycle.
Detailed description of the invention
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) in the free water stage after getting rid of tundish overhaul in permanent layer: the tundish permanent layer after overhaul is 16 DEG C from room temperature and is heated to 110 DEG C, it is 0.2 DEG C/min that its programming rate controls, and the heating-up time is 470 minutes; And 48.5 hours have been incubated at 110 DEG C; Free water weight percent content is 0.31%;
2) slough the crystallization water stage in permanent layer: under programming rate is 0.45 DEG C/min, temperature is risen to 330 DEG C, the heating-up time is 489 minutes; At 330 DEG C, temperature retention time is 49.5 hours; Crystallization water weight percent content is 0.12%;
3) carry out the soaking stage to permanent layer: under programming rate is 0.68 DEG C/min, temperature is risen to 635 DEG C, the heating-up time is 450 minutes; At 635 DEG C, temperature retention time is 48 hours;
4) carried out to permanent layer the baking stage: continue heating, within 3.5 hours, be heated to 720 DEG C, and toast 8.1 hours at these elevated temperatures;
5) room temperature is naturally cooled to, 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 excellent, and permanent layer life cycle is 151 and waters secondary.
Embodiment 2
Baking method after the overhaul of 250 tons of pneumatic steelmaking tundish permanent layer, its step:
1) in the free water stage after getting rid of tundish overhaul in permanent layer: the tundish permanent layer after overhaul is 23 DEG C from room temperature and is heated to 150 DEG C, it is 0.25 DEG C/min that its programming rate controls, and the heating-up time is 508 minutes; And 48.5 hours have been incubated at 150 DEG C; Free water weight percent content is 0.42%;
2) slough the crystallization water stage in permanent layer: under programming rate is 0.37 DEG C/min, temperature is risen to 345 DEG C, the heating-up time is 527 minutes; At 345 DEG C, temperature retention time is 49 hours; Crystallization water weight percent content is 0.16%;
3) carry out the soaking stage to permanent layer: under programming rate is 0.56 DEG C/min, temperature is risen to 600 DEG C, the heating-up time is 455 minutes; At 600 DEG C, temperature retention time is 49.5 hours;
4) carried out to permanent layer the baking stage: continue heating, within 4 hours, be heated to 750 DEG C, and toast 8 hours at these elevated temperatures;
5) room temperature is naturally cooled to, 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 excellent, and permanent layer life cycle is 158 and waters secondary.
Embodiment 3
Baking method after the overhaul of 300 tons of pneumatic steelmaking tundish permanent layer, its step:
1) in the free water stage after getting rid of tundish overhaul in permanent layer: the tundish permanent layer after overhaul is 28 DEG C from room temperature and is heated to 195 DEG C, it is 0.35 DEG C/min that its programming rate controls, and the heating-up time is 477 minutes; And 48.5 hours have been incubated at 195 DEG C; Free water weight percent content is 0.2%;
2) slough the crystallization water stage in permanent layer: under programming rate is 0.39 DEG C/min, temperature is risen to 360 DEG C, the heating-up time is 423 minutes; At 360 DEG C, temperature retention time is 48.2 hours; Crystallization water weight percent content is 0.18%;
3) carry out the soaking stage to permanent layer: under programming rate is 0. 6 DEG C/min, temperature is risen to 660 DEG C, the heating-up time is 423 minutes; At 660 DEG C, temperature retention time is 48.6 hours;
4) carried out to permanent layer the baking stage: continue heating, within 3.8 hours, be heated to 780 DEG C, and toast 8.5 hours at these elevated temperatures;
5) room temperature is naturally cooled to, 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 excellent, and permanent layer life cycle is 163 and waters secondary.
Embodiment 4
Baking method after the overhaul of 250 tons of pneumatic steelmaking tundish permanent layer, its step:
1) in the free water stage after getting rid of tundish overhaul in permanent layer: the tundish permanent layer after overhaul is 26 DEG C from room temperature and is heated to 185 DEG C, it is 0.39 DEG C/min that its programming rate controls, and the heating-up time is 459 minutes; And 48.2 hours have been incubated at 185 DEG C; Free water weight percent content is 0.21%;
2) slough the crystallization water stage in permanent layer: under programming rate is 0.48 DEG C/min, temperature is risen to 400 DEG C, the heating-up time is 448 minutes; At 400 DEG C, temperature retention time is 48 hours; Crystallization water weight percent content is 0.15%;
3) carry out the soaking stage to permanent layer: under programming rate is 0. 58 DEG C/min, temperature is risen to 650 DEG C, the heating-up time is 431 minutes; At 650 DEG C, temperature retention time is 48.5 hours;
4) carried out to permanent layer the baking stage: continue heating, within 3.2 hours, be heated to 715 DEG C, and toast 8.3 hours at these elevated temperatures;
5) room temperature is naturally cooled to, 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 excellent, and permanent layer life cycle is 160 and waters secondary.
Embodiment 5
Baking method after the overhaul of 300 tons of pneumatic steelmaking tundish permanent layer, its step:
1) in the free water stage after getting rid of tundish overhaul in permanent layer: the tundish permanent layer after overhaul is 22 DEG C from room temperature and is heated to 135 DEG C, it is 0.22 DEG C/min that its programming rate controls, and the heating-up time is 477 minutes; And 49 hours have been incubated at 135 DEG C; Free water weight percent content is 0.16%;
2) slough the crystallization water stage in permanent layer: under programming rate is 0.46/ minute, temperature is risen to 375 DEG C, the heating-up time is 515 minutes; At 375 DEG C, temperature retention time is 48.8 hours; Crystallization water weight percent content is 0.1%;
3) carry out the soaking stage to permanent layer: under programming rate is 0. 72 DEG C/min, temperature is risen to 700 DEG C, the heating-up time is 451 minutes; At 700 DEG C, temperature retention time is 48.2 hours;
4) carried out to permanent layer the baking stage: continue heating, within 3 hours, be heated to 800 DEG C, and toast 8 hours at these elevated temperatures;
5) room temperature is naturally cooled to, 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 excellent, and permanent layer life cycle is 168 and waters secondary.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (1)
1. the baking method after the overhaul of steel-making tundish permanent layer, its step:
1) the free water stage after the overhaul of eliminating tundish in permanent layer: first the tundish permanent layer after overhaul is heated to 185 ~ 200 DEG C, and its programming rate controls at 0.15 ~ 0.25 DEG C/min or 0.35 ~ 0.39 DEG C/min, and the heating-up time controls at 7 ~ 9 hours; And insulation is not less than 48 hours at 185 ~ 200 DEG C; Control free moisture weight percent content and be no more than 0.5%;
2) slough the crystallization water stage in permanent layer: under programming rate is 0.37 ~ 0.39 DEG C/min or 0.45 ~ 0.48 DEG C/min, temperature is risen to 300 ~ 345 DEG C or 360 ~ 400 DEG C, the heating-up time controls at 7 ~ 9 hours; At 300 ~ 345 DEG C or 360 ~ 400 DEG C, insulation is not less than 48 hours; Crystallization control moisture weight degree is no more than 0.3%;
3) carry out the soaking stage to permanent layer: under programming rate is 0.56 ~ 0.72 DEG C/min, temperature is risen to 600 ~ 700 DEG C, the heating-up time controls at 7 ~ 9 hours; At 600 ~ 700 DEG C, insulation is not less than 48 hours;
4) carried out to permanent layer the baking stage: continue heating, raised the temperature in 4 hours and be greater than 700 DEG C to 800 DEG C, and baking is not less than 8 hours at these elevated temperatures;
5) room temperature is naturally cooled to, stand-by.
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| Application Number | Priority Date | Filing Date | Title |
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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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| 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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| CN103551555A CN103551555A (en) | 2014-02-05 |
| CN103551555B true CN103551555B (en) | 2015-09-23 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52100328A (en) * | 1976-02-20 | 1977-08-23 | Meiwa Kagaku Kogyo | Inner lining material of tundish |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
|---|
| 提高75t盛钢桶桶衬寿命的研究;喻钟义;《四川冶金》;19960630(第2期);第31-35页 * |
| 浇注料炉衬烘炉"放爆"现象分析;唐兴智;《鞍钢技术》;19901231(第12期);第36-40页 * |
| 连铸中间包永久衬的整体浇注;李学良等;《宽厚板》;20010430;第7卷(第4期);第16-18页 * |
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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 Co.,Ltd. Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: WUHAN IRON AND STEEL (GROUP) Corp. |
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Granted publication date: 20150923 |