CN108637199A - The method for pouring the first stove ladle molten steel temperature is unwrapped among a kind of reduction - Google Patents
The method for pouring the first stove ladle molten steel temperature is unwrapped among a kind of reduction Download PDFInfo
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- CN108637199A CN108637199A CN201810565951.1A CN201810565951A CN108637199A CN 108637199 A CN108637199 A CN 108637199A CN 201810565951 A CN201810565951 A CN 201810565951A CN 108637199 A CN108637199 A CN 108637199A
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- tundish
- molten steel
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- stove
- blown
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
Abstract
The method for pouring the first stove ladle molten steel temperature is unwrapped among a kind of reduction, belongs to continuous casting of iron and steel technical field；Method is：1) it before centre is unwrapped and poured, opens when pouring the first stove pouring molten steel to tundish, inert gas is blown by tundish bottom gas-permeable nozzle brick cup molten steel into tundish；2) it is persistently blown into inert gas, so that the liquid steel temperature right over tundish gas-permeable nozzle brick cup in 6cm is improved 5~8 DEG C, and liquid steel temperature is uniform；In air blowing process in step 1 as defined in pressure and range of flow, with liquid level adjustment blow gas pressure and flow in tundish, being fluctuated slightly with liquid steel level is advisable；3) in tundish liquid steel level reach specified altitude, start just it is normally opened pour after, stopping be blown into inert gas；Unwrapping the when of pouring the first stove pouring molten steel to tundish among the method for the present invention starts to be blown into argon gas, effectively reduce it is intermediate unwraps the temperature for pouring the first stove molten steel, reduce production cost, increase economic efficiency, be more suitable for field application.
Description
Technical field
The invention belongs to continuous casting of iron and steel technical fields, and in particular to unwrapped among a kind of reduction and pour the first stove ladle molten steel temperature
The method of degree.
Background technology
When tundish is not poured into a mould, since tundish lining temperature belongs to " cold " tundish, temperature is relatively low in tundish.
Centre is unwrapped when pouring, and high-temperature molten steel enters tundish, and tundish lining can siphon away a part of heat, cause molten steel in tundish
Temperature is more more than the liquid steel temperature reduction normally poured into a mould, and liquid steel temperature reduction can make the mobility of molten steel be deteriorated, middle water containing opening
Steel condensation easily occurs for place, and nozzle blocking is caused even to cause to stop pouring accident.To prevent at middle water containing opening since liquid steel temperature drops
The cold steel of low knot blocks the mouth of a river, it is ensured that the direct motion of casting process, centre, which is unwrapped, pours in the first stove ladle liquid steel temperature than even pouring furnace temperature
Degree wants high, can cause a large amount of energy consumption in this way, increases production cost, how to reduce centre and unwraps and pours the first stove ladle steel
The temperature of water is always to perplex a general character problem of produced on-site.
Currently, to ensure casting process direct motion, improves intermediate unwrap and pour the first stove ladle molten steel temperature, mainly use two classes
Method.One kind improves the temperature of ladle molten steel in refining stage, such as is heated up by heated by electrodes in refining procedure and improve steel
Coolant-temperature gage.Refining stage raising liquid steel temperature is not only of high cost, energy consumption is big, and due to accurately to ensure to improve intermediate unwrap
The the first stove ladle molten steel temperature poured, and to other even the ladle that pours without heat temperature raising, in this way to spot dispatch require compared with
Height, in usual production process, due to scheduling rhythm limitation, it is difficult to ensure that centre unwraps and pours the first stove ladle molten steel temperature and meet
It is required that.
It is another kind of, it is heating equipment to be added in tundish, such as using the methods of plasma or sensing heating, carry
It is unwrapped between senior middle school and pours the first stove ladle molten steel temperature.But this method is larger to tundish transformation, and scrap build is of high cost；First stove
After ladle molten steel is poured into tundish, a large amount of energy can also be consumed by heating molten steel in tundish, and can be significantly increased and be produced into
This.Currently, iron and steel enterprise, during basket pouring, there is no effective intermediate unwrap of economic reduction to pour the first stove
The method of ladle molten steel temperature.
Invention content
For reducing, the problem of pouring the first stove ladle molten steel temperature is unwrapped in centre and the deficiencies in the prior art, the present invention carry
Go out among a kind of reduction and unwraps the method for pouring the first stove ladle molten steel temperature.The present invention is based on production cost considerations, fully combine
Produced on-site is practical, and inert gas is blown into tundish by tundish bottom gas-permeable nozzle brick cup, improves intermediate unwrap and pours
First stove ladle molten steel temperature, effectivelying prevent the cooling of tundish bottom molten steel to tie cold steel leads to nozzle blocking, in reducing
Between unwrap and pour the first stove ladle molten steel temperature, cost can be reduced, greatly improve economic benefit.
The method for pouring the first stove ladle molten steel temperature is unwrapped among a kind of reduction, specifically includes following steps：
Step 1：Before centre is unwrapped and poured, open when pouring the first stove pouring molten steel to tundish, it is ventilative by tundish bottom
Pocket block molten steel into tundish is blown into inert gas；Wherein：The pressure for being blown into inert gas is：0.2~0.4MPa, stream
Amount is 1~20Nm3/h；
Step 2：It is persistently blown into inert gas, the liquid steel temperature right over tundish gas-permeable nozzle brick cup in 6cm is made to improve 5
~8 DEG C, and liquid steel temperature is uniform；In air blowing process in step 1 as defined in pressure and range of flow, with liquid in tundish
Face height adjustment blow gas pressure and flow, being fluctuated slightly with liquid steel level is advisable；
Step 3：In tundish liquid steel level reach specified altitude, start just it is normally opened pour after, stopping be blown into inert gas.
The method for pouring the first stove ladle molten steel temperature is unwrapped among a kind of above-mentioned reduction, wherein：
In the method, inert gas is argon gas.
In the method, gassing time is 2~5min.
In the step 1, centre, which is unwrapped, pours the first stove ladle molten steel and refers to：It is unwrapped among casting process when pouring, cast
The molten steel of the first stove ladle in tundish, pouring molten steel is to tundish in ladle, and molten steel reach a certain height in tundish
Afterwards, tundish tapping hole is opened, and starts to pour into a mould.
In the step 1, it is blown into inert gas to molten steel, promotes molten steel stirring, improves the steel above gas-permeable nozzle brick cup
Coolant-temperature gage.
In the step 2, gas pressure and flow are controlled in air blowing process, being fluctuated slightly with liquid steel level is advisable.First
When stove ladle molten steel is just poured into tundish, liquid level is relatively low in tundish, causes molten steel to drop to avoid blowing open in molten steel face
Temperature needs to control blow gas pressure and flow cannot be excessive；After molten steel reach a certain height in tundish, it is to be ensured that stirring of blowing
The effect of molten steel, controls blow gas pressure and flow cannot be too small.In entire air blowing process, in the blow gas pressure that this patent proposes
In the control range of flow, with liquid level adjustment blow gas pressure and flow in tundish, is fluctuated slightly with liquid steel level and be
Preferably.
In the step 2, it is blown into inert gas and controls gas flow in the process, being fluctuated slightly with liquid steel level is advisable, and is
In order to ensure that molten steel will not cool down due to excessive agitation.
In the step 2, it is persistently blown into inert gas, liquid steel temperature improves and temperature is uniform so that molten steel will not cool down
Condensation ensures just normally opened pour.
In the step 3, liquid steel level reaches specified altitude in tundish, refers to steel in the intermediate tundish unwrapped when pouring
Liquid level temperature.
The method for pouring the first stove ladle molten steel temperature is unwrapped among a kind of reduction of the present invention, compared with prior art,
Advantage and advantageous effect are：
The present invention unwraps the when of pouring the first stove pouring molten steel to tundish in centre and starts to be blown into argon gas, promotes tundish bottom
MOLTEN STEEL FLOW improves fluidity molten steel, the case where effectivelying prevent tundish bottom molten steel cooling condensation and lead to nozzle blocking,
The temperature for pouring the first stove ladle molten steel is unwrapped to which effectively reduction is intermediate, reduces the consumption of the energy and the waste of resource, drops
Low cost is increased economic efficiency；The present invention fully combines produced on-site practical, need not be controlled by spot dispatch, in
Between unwrap and pour the first stove ladle molten steel, by bottom blowing inert gas, improve the temperature of molten steel, save manual operation, meanwhile,
The present invention is compared to the complex device that other heat molten steel, and at low cost, energy consumption is small, and easy to operate, benefit is apparent, is more suitable for
Field application.
Description of the drawings
Fig. 1 is the tundish Bottom Blowing system schematic in the embodiment of the present invention.
In figure, 1, tundish；2, gas-permeable nozzle brick cup；3, pressure gauge；4, flowmeter；5, valve.
Specific implementation mode：
The present invention is further described with embodiment below in conjunction with the accompanying drawings, but is not limited only to this.
Embodiment 1：
The method for pouring the first stove ladle molten steel temperature is unwrapped among a kind of reduction, as shown in Figure 1, used by the present embodiment
Tundish is 30 tons.
Step 1：Before centre is unwrapped and poured, open when pouring the first stove pouring molten steel to tundish, it is ventilative by tundish bottom
Pocket block molten steel into tundish is blown into inert gas.Wherein：The pressure for being blown into inert gas is：0.2MPa, flow 1
~5Nm3/h；
Step 2：It is persistently blown into inert gas, the temperature of the molten steel right over tundish gas-permeable nozzle brick cup in 6cm is made to carry
It is 5~8 DEG C high.Gas flow is controlled in air blowing process, being fluctuated slightly with liquid steel level is advisable.
Step 3：Liquid steel level reaches specified altitude in tundish, and after tundish starts just normally opened pour, stopping is blown into inertia
Gas.
It is 2min that gassing time is controlled in the present embodiment.
It is 25 DEG C to be unwrapped among under the technique of the present embodiment Central Plains and pour the first stove ladle molten steel degree of superheat Δ T.Using the above work
Skill parameter, it is 19 DEG C that centre, which unwraps and pours the first stove ladle molten steel degree of superheat Δ T, and the degree of superheat reduces 6 DEG C, and does not occur intermediate
The cold steel clogging of water-coating port knot.
Embodiment 2：
The method for pouring the first stove ladle molten steel temperature is unwrapped among a kind of reduction, as shown in Figure 1, used by the present embodiment
Tundish is 40 tons.
Step 1：Before centre is unwrapped and poured, open when pouring the first stove pouring molten steel to tundish, it is ventilative by tundish bottom
Pocket block molten steel into tundish is blown into inert gas.Wherein：The pressure for being blown into inert gas is：0.3MPa, flow 8
~12Nm3/h；
Step 2：It is persistently blown into inert gas, the temperature of the molten steel right over tundish gas-permeable nozzle brick cup in 6cm is made to carry
It is 5~8 DEG C high.Gas flow is controlled in air blowing process, being fluctuated slightly with liquid steel level is advisable.
Step 3：Liquid steel level reaches specified altitude in tundish, and after tundish starts just normally opened pour, stopping is blown into inertia
Gas.
It is 3.5min that gassing time is controlled in the present embodiment.
It is 30 DEG C to be unwrapped among under the technique of the present embodiment Central Plains and pour the first stove ladle molten steel degree of superheat Δ T.Using the above work
Skill parameter, it is 22.5 DEG C that centre, which unwraps and pours the first stove ladle molten steel degree of superheat Δ T, and the degree of superheat reduces 7.5 DEG C, and does not occur
The cold steel clogging of middle water containing opening knot.
Embodiment 3：
The method for pouring the first stove ladle molten steel temperature is unwrapped among a kind of reduction, as shown in Figure 1, used by the present embodiment
Tundish is 50 tons.
Step 1：Before centre is unwrapped and poured, open when pouring the first stove pouring molten steel to tundish, it is ventilative by tundish bottom
Pocket block molten steel into tundish is blown into inert gas.Wherein：The pressure for being blown into inert gas is：0.4MPa, flow are
15~20Nm3/h；
Step 2：It is persistently blown into inert gas, the temperature of the molten steel right over tundish gas-permeable nozzle brick cup in 6cm is made to carry
It is 5~8 DEG C high.Gas flow is controlled in air blowing process, being fluctuated slightly with liquid steel level is advisable.
Step 3：Liquid steel level reaches specified altitude in tundish, and after tundish starts just normally opened pour, stopping is blown into inertia
Gas.
It is 5min that gassing time is controlled in the present embodiment.
It is 35 DEG C to be unwrapped among under the technique of the present embodiment Central Plains and pour the first stove ladle molten steel degree of superheat Δ T.Using the above work
Skill parameter, it is 27 DEG C that centre, which unwraps and pours the first stove ladle molten steel degree of superheat Δ T, and the degree of superheat reduces 8+, and tundish does not occur
Tie cold steel clogging in the mouth of a river.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that the technical side of the present invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Right in.
Claims (3)
1. unwrapping the method for pouring the first stove ladle molten steel temperature among a kind of reduction, which is characterized in that specifically include following steps：
Step 1：Before centre is unwrapped and poured, opens when pouring the first stove pouring molten steel to tundish, pass through tundish bottom gas-permeable nozzle
Brick cup molten steel into tundish is blown into inert gas；Wherein：The pressure for being blown into inert gas is：0.1~0.5MPa, flow 1
~20Nm3/h；
Step 2：It is persistently blown into inert gas, the liquid steel temperature right over tundish gas-permeable nozzle brick cup in 6cm is made to improve 5~8
DEG C, and liquid steel temperature is uniform；In air blowing process in step 1 as defined in pressure and range of flow, it is high with liquid level in tundish
Degree adjustment blow gas pressure and flow, being fluctuated slightly with liquid steel level is advisable；
Step 3：In tundish liquid steel level reach specified altitude, start just it is normally opened pour after, stopping be blown into inert gas.
2. unwrapping the method for pouring the first stove ladle molten steel temperature among a kind of reduction according to claim 1, feature exists
In in the method, inert gas is argon gas.
3. unwrapping the method for pouring the first stove ladle molten steel temperature among a kind of reduction according to claim 1, feature exists
In in the method, gassing time is 2~5min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810565951.1A CN108637199B (en) | 2018-06-04 | 2018-06-04 | Method for reducing molten steel temperature of first-furnace ladle for pouring of tundish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810565951.1A CN108637199B (en) | 2018-06-04 | 2018-06-04 | Method for reducing molten steel temperature of first-furnace ladle for pouring of tundish |
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| CN108637199A true CN108637199A (en) | 2018-10-12 |
| CN108637199B CN108637199B (en) | 2020-03-31 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114082908A (en) * | 2021-11-20 | 2022-02-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for reducing temperature of molten steel in casting furnace |
| CN115007845A (en) * | 2022-06-15 | 2022-09-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for filling drainage sand in high-cleanness steel production process |
| CN115138832A (en) * | 2021-03-29 | 2022-10-04 | 宝山钢铁股份有限公司 | Method for prolonging number of pure steel pouring furnaces based on molten steel weight information |
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| US3822735A (en) * | 1969-07-11 | 1974-07-09 | Nat Steel Corp | Process for casting molten silicon-aluminum killed steel continuously |
| US4987949A (en) * | 1988-07-29 | 1991-01-29 | Hitachi Zosen Corporation | Protective cover for surface of molten steel used in continuous casting apparatus |
| JPH0428467A (en) * | 1990-05-24 | 1992-01-31 | Kawasaki Steel Corp | Method for controlling molten steel temperature |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115138832A (en) * | 2021-03-29 | 2022-10-04 | 宝山钢铁股份有限公司 | Method for prolonging number of pure steel pouring furnaces based on molten steel weight information |
| CN115138832B (en) * | 2021-03-29 | 2024-01-09 | 宝山钢铁股份有限公司 | Method for prolonging number of pure steel pouring furnaces based on molten steel weight information |
| CN114082908A (en) * | 2021-11-20 | 2022-02-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for reducing temperature of molten steel in casting furnace |
| CN115007845A (en) * | 2022-06-15 | 2022-09-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for filling drainage sand in high-cleanness steel production process |
| CN115007845B (en) * | 2022-06-15 | 2024-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Drainage sand filling method in high-clean steel production process |
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