CN103273023B - A kind of extra-high manganese steel continuous casting manufacturing technique - Google Patents
A kind of extra-high manganese steel continuous casting manufacturing technique Download PDFInfo
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- CN103273023B CN103273023B CN201310226922.XA CN201310226922A CN103273023B CN 103273023 B CN103273023 B CN 103273023B CN 201310226922 A CN201310226922 A CN 201310226922A CN 103273023 B CN103273023 B CN 103273023B
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Abstract
The invention belongs to metallurgical continuous casting technology field, particularly relate to a kind of extra-high manganese steel continuous casting manufacturing technique, it is characterized in that, including from reduction water time first tank molten steel in tundish temperature drop, reduce water time first tank molten steel in crystallizer temperature drop, prevent from starting with in terms of in crystallizer, green shell breaks three, wherein water time first tank molten steel temperature drop in tundish for reduction, it is in the baking of tundish stage, by taking coal gas+air+combustion oxygen measure, improves gas combustion efficiency.Water time first tank molten steel temperature drop in crystallizer for reduction, be to open the stage of watering by crystallizer cooling water flow；Being to improve to open to water stage shell thickness for prevent green shell in crystallizer from breaking taking technical scheme, reducing the pulling rate amplitude of variation opening the stage of watering.Compared with prior art, the invention has the beneficial effects as follows: solving carbon content about 0.60%, Fe content opens, at the high alloy steel grade of about 20%, the problem of watering smoothly.
Description
Technical field
The invention belongs to metallurgical continuous casting technology field, particularly relate to a kind of extra-high manganese steel continuous casting manufacturing technique.
Background technology
Along with the automobile industry requirements at the higher level to the production efficiency of special product, iron and steel enterprise does not turns off to send and is suitable to improve
The steel products of automobile stamping molding first-time qualification rate, therefore in steel, the alloying element content such as manganese is continuously increased, and is reaching certain
After marginal value, continuous casting process cannot adapt to steel grade requirement, is forced to take molding to produce, and molding production, to there is production efficiency low
Under, the problem such as interior surface Quality Down, production cost be high.
Conticaster produce Fe content be up to 20%, carbon content when 0.60%, continuous casting is opened and bleed-out is easily occurred during watering, and leads
Causing bleed-out accident generation main cause is: A, is opening the stage of watering, is watering stage molten steel at tundish, crystallizer casting process owing to opening
In, molten steel temperature drop is big, causes opening the green shell temperature that the stage of watering formed in crystallizer low, and the decline of strain resistant ability is easily broken.
B, steel grade characteristic (high-carbon, Gao Meng) cold plasticity reduce, and easily break opening the process of watering, occur that bleed-out problem occurs.
Summary of the invention
It is an object of the invention to provide a kind of extra-high manganese steel continuous casting manufacturing technique, by optimizing associated production technical parameter,
Ensure that conticaster leaves the stage of watering and produces smoothly, prevent the accidents such as bleed-out from occurring.
For achieving the above object, the technical scheme is that
A kind of extra-high manganese steel continuous casting manufacturing technique, waters including watering time first tank molten steel temperature drop, reduction in tundish from reduction
Secondary first tank molten steel in crystallizer temperature drop, prevent from green shell in crystallizer from breaking three aspects starting with, wherein water time first for reduction
Tank molten steel temperature drop in tundish, its concrete operation step is as follows:
1) in the baking of tundish stage, by taking coal gas+air+combustion oxygen measure, improve gas combustion efficiency, carry
High tundish baking temperature, wherein coal gas: compressed air: the volume ratio of combustion oxygen controls as 1:(5 ~ 6): 0.2, tundish dries
Roasting time 6 ~ 7h；
2) opening that to water front tundish temperature be 1400 ~ 1500 DEG C, molten steel should be less than 15 DEG C from big tank to tundish temperature drop.
Watering time first tank molten steel temperature drop in crystallizer for reduction, its concrete operation step is as follows:
1. crystallizer cooling water flow is controlled to 200 ~ 260m opening the stage of watering3/h；
The most split cooling material watering use toasts, baking temperature 500 ~ 550 DEG C, opens cooling material before watering
Addition is 10 ~ 30kg.
Breaking for green shell in preventing crystallizer, its concrete operation step is as follows:
1. improving to open and water stage shell thickness to improve tension stress ability, seedling-growing time is 130 ~ 180 seconds, green shell thickness
Degree is 20 ~ 35mm.
2. reducing tension amplitude of variation to take measures, control is opened and watered pulling rate is 0.1 ~ 0.2m/min, opens and waters ramp-up stage
Raising speed acceleration is 0.04 ~ 0.06 m/min2。
Compared with prior art, the invention has the beneficial effects as follows: cooled down by bag baking temperature, minimizing crystallizer in improving
Intensity, reduce the means such as throwing stress opening the stage of watering, solve carbon content about 0.60%, Fe content about 20% height
The problem of watering opened smoothly by alloy steel grade.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described:
A kind of extra-high manganese steel continuous casting manufacturing technique of the present invention, including from reduction water time first tank molten steel in tundish temperature drop,
Reduce water time first tank molten steel in crystallizer temperature drop, prevent from green shell in crystallizer from breaking several aspect starting with, wherein for reduction
Watering time first tank molten steel principle of temperature drop in tundish is to improve baking of tundish temperature, and its concrete operation step is as follows:
1) in the baking of tundish stage, by taking coal gas+air+combustion oxygen measure, improve gas combustion efficiency, carry
High tundish baking temperature, wherein coal gas: compressed air: the volume ratio of combustion oxygen controls as 1:(5 ~ 6): 0.2, tundish dries
Roasting time 6 ~ 7h；
2) open and water front tundish temperature and brought up to 1400 ~ 1500 DEG C by 1000 ~ 1100 DEG C, keep tundish temperature to reach molten steel
More than liquidus temperature, molten steel should reduce water time first tank temperature drop in centre less than 15 DEG C from big tank to tundish temperature drop.
Watering time first tank molten steel temperature drop in crystallizer for reduction, it controls thinking is to open from reduction that to water stage crystallizer cold
But intensity, raising cooling material temperature degree and minimizing cooling material consumption several respects are started with, and its concrete operation step is as follows:
1. the stage of watering is being opened by crystallizer cooling water flow 200 ~ 260m3/ h, decreases 10 ~ 20%；
The most split cooling material watering use toasts, baking temperature 500 ~ 550 DEG C, opens cooling material before watering
Addition is 10 ~ 30kg, decreases 20 ~ 50%.
For preventing from green shell in crystallizer from breaking adopting the technical scheme that reducing the tension of initial solidification shell in crystallizer,
Its concrete operation step is as follows:
1. improve to open and water stage shell thickness to improve tension stress ability, prolongation seedling-growing time, seedling-growing time is 130 ~
180 seconds, seedling-growing time extended 20 ~ 40%, and shell thickness is 20 ~ 35mm, and shell thickness adds 15 ~ 25%；
2. reduce tension amplitude of variation to take measures: reduce and open the pulling rate amplitude of variation in the stage of watering, i.e. open water pulling rate by
0.3m/min reduces to 0.1 ~ 0.2m/min, opens and waters ramp-up stage raising speed acceleration for by 0.1m/min2Reduce to 0.04 ~ 0.06 m/
min2。
Claims (1)
1. an extra-high manganese steel continuous casting manufacturing technique, waters secondary including watering time first tank molten steel temperature drop, reduction in tundish from reduction
First tank molten steel in crystallizer temperature drop, prevent from green shell in crystallizer from breaking three aspects starting with, wherein water time first tank for reduction
Molten steel is temperature drop in tundish, and its concrete operation step is as follows:
1) in the baking of tundish stage, by taking coal gas+air+combustion oxygen measure, gas combustion efficiency is improved, in raising
Between bag baking temperature, wherein coal gas: compressed air: the volume ratio of combustion oxygen controls as 1:(5～6): 0.2, baking of tundish
Time 6～7h；
2) opening that to water front tundish temperature be 1400～1500 DEG C, molten steel should be less than 15 DEG C from big tank to tundish temperature drop；
It is characterized in that, watering time first tank molten steel temperature drop in crystallizer for reduction, its concrete operation step is as follows:
1. crystallizer cooling water flow is controlled to 200～260m opening the stage of watering3/h；
The most split cooling material watering use toasts, baking temperature 500～550 DEG C, opens and cools down adding of material before watering
Entering amount is 10～30kg；
Breaking for green shell in preventing crystallizer, its concrete operation step is as follows:
1. improving to open and water stage shell thickness to improve tension stress ability, seedling-growing time is 130～180 seconds, and shell thickness is
20～35mm；
2. reducing tension amplitude of variation to take measures, control is opened and watered pulling rate is 0.1～0.2m/min, opens and waters ramp-up stage raising speed
Acceleration is 0.04～0.06m/min2。
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| CN201310226922.XA CN103273023B (en) | 2013-06-07 | 2013-06-07 | A kind of extra-high manganese steel continuous casting manufacturing technique |
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| CN103273023B true CN103273023B (en) | 2016-12-28 |
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| CN111331096B (en) * | 2020-03-19 | 2022-02-25 | 山西太钢不锈钢股份有限公司 | Method for eliminating bubbles of duplex stainless steel |
| CN111318658A (en) * | 2020-03-24 | 2020-06-23 | 山西太钢不锈钢股份有限公司 | Invar alloy and continuous casting production method thereof |
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| CN2286437Y (en) * | 1996-08-29 | 1998-07-22 | 天津钢管公司 | Suction type heating means for tundishes pouring opening |
| JP3588411B2 (en) * | 1997-09-22 | 2004-11-10 | 新日本製鐵株式会社 | Stainless steel continuous casting method |
| CN200974117Y (en) * | 2006-09-06 | 2007-11-14 | 戴光荣 | Ladle heating device push bar cross beam with fireguard |
| CN100500916C (en) * | 2007-10-17 | 2009-06-17 | 莱芜钢铁集团有限公司 | Boron-containing steel and preparation method thereof |
| CN101716660B (en) * | 2009-11-28 | 2012-05-23 | 山西太钢不锈钢股份有限公司 | Continuous casting method of heat-resistance stainless steel for steam turbine blade |
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