CN108611465A - A kind of molten steel refining method improving RH decarbonization rates - Google Patents
A kind of molten steel refining method improving RH decarbonization rates Download PDFInfo
- Publication number
- CN108611465A CN108611465A CN201611142399.2A CN201611142399A CN108611465A CN 108611465 A CN108611465 A CN 108611465A CN 201611142399 A CN201611142399 A CN 201611142399A CN 108611465 A CN108611465 A CN 108611465A
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- CN
- China
- Prior art keywords
- white lime
- molten steel
- decarbonization
- rates
- decarburization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
Abstract
The invention discloses a kind of molten steel refining method improving RH decarbonization rates, it is 0.045%~0.055% that converter tapping, which controls endpoint carbon content, and oxygen is determined after stove, and activity oxygen is more than 600ppm, and tapping temperature is controlled at 1670 DEG C or more；Ladle is transported to RH stations, ensures that inlet temperature is more than 1600 DEG C, vacuumizes carry out Decarburization Operation；Decarburization starts the vacuum degree of 6~9min and vacuum chamber in 500Pa or less, white lime is put into from high hopper, the addition of white lime is 5~15kg/t steel, white lime granularity is 0.2~0.5mm, the present invention increases molten steel reaction interface product by the hydrogen that white lime decomposites, and then decarbonization rate is improved, the method does not increase the duration of heat, and operation is simple.
Description
Technical field
The invention belongs to metallurgical technology fields, are related specifically to a kind of molten steel refining method improving RH decarbonization rates.
Background technology
As to the needs of low-carbon, ultra-low-carbon steel and other steel grades, major straight carbon steel factory introduces RH vacuum fines in the market
It refines as the external refining equipment for producing such steel grade.Existing RH devices basic principle is by the argon gas mounted on tedge
Channel is blown into argon gas, and drives the molten steel in ladle to enter tedge under the action of vacuum, after vacuum chamber, then by declining
Pipe returns to ladle and completes one cycle, to realize the batch processing of molten steel.
By taking the representative IF steel of ultra-low-carbon steel as an example, the production line of straight carbon steel factory is essentially converter-RH- continuous castings at present.Turn
Stove taps carbon control 0.03%~0.06%, and carries out deep decarburization in RH stoves, according to the requirement decarburization of steel grade to 0.0010%
~0.01%, and it is completed at the same time temperature and the whole adjustment of remaining alloying component.And due to the influence of front and back process, such as converter tapping
The problems such as temperature is low, casting machine constant speed is insufficient, RH sometimes requires that processing time is tighter.In order to meet smoothly pushing away for entire process
Into the problems such as process cycle brought of reply rhythm of production is insufficient, it is necessary to which exploitation improves the technique of RH decarbonization rates, meets life
Production needs.
Invention content
The purpose of the present invention is to provide a kind of molten steel refining methods improving RH decarbonization rates, due in RH refining process
Temperature is generally higher than 1560 DEG C, and at this temperature, calcium hydroxide is decomposed into calcium oxide and water, water can resolve into again hydrogen and
Oxygen, the hydrogen decomposited by white lime accumulate to increase molten steel reaction interface, and then improve decarbonization rate, this method does not increase smelting
The time is refined, operation is simple.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of molten steel refining method improving RH decarbonization rates is added decarburization early period by being refined in RH stoves from high hopper
White lime, addition are 5~15kg/t steel, and white lime granularity is 0.2~0.5mm, to improve decarbonization rate, the specific steps are：
Step 1：It is 0.045%~0.055% that converter tapping, which controls endpoint carbon content, determines oxygen after stove, activity oxygen is more than
600ppm, tapping temperature are controlled at 1670 DEG C or more；
Step 2：Ladle is transported to RH stations, ensures that inlet temperature is more than 1600 DEG C, vacuumizes carry out Decarburization Operation；
Step 3：Decarburization starts the vacuum degree of 6~9min and vacuum chamber in 500Pa or less, is added from high hopper ripe
The addition of lime, white lime is 5~15kg/t steel, and white lime granularity is 0.2~0.5mm.
To reduce the temperature drop disposably largely to feed and making its rapid melting, white lime point 2~3 batches adds in the step 3
Enter, it is 3~5min that interval time, which is added, in every batch of.
The present invention has cleverly used calcium hydroxide and the water decomposition smelted under high temperature by the way that white lime is added.Water decomposition
Made of hydrogen provide decarburizing reaction interface, improve the kinetic factor of decarburizing reaction.And the calcium oxide resolved into simultaneously
It floats and enters top slag, and then form the thin slag blanket of a floor height calcium oxide, the Al after deoxidation can be adsorbed2O3.The present invention is at low cost, behaviour
Make simply, equipment will not be damaged, also without security risk.The present invention not only can fundamentally improve RH decarburization speed
Rate, while the Al after deoxidation can be adsorbed2O3, the amount of inclusions in steel is reduced, Cleanliness of Molten Steel is improved.Experiment confirms by contrast,
With this method on IF steel, 3~5min of decarburization time is reduced.
Specific implementation mode
A kind of molten steel refining method improving RH decarbonization rates, 3 groups of experiments (containing contrast test) are raw in 260t converters
It is tested when producing IF steel, final test data is shown in Table 1.It is as follows：
Embodiment 1：
(1) converter tapping control endpoint carbon content is 0.048%, and oxygen is determined after stove, and activity oxygen is more than 608ppm, tapping temperature
Control is at 1672 DEG C；
(2) ladle is transported to RH stations, and enter the station 1608 DEG C of thermometric, vacuumizes carry out Decarburization Operation；
(3) after decarburization starts 6min, the vacuum degree of vacuum chamber puts into white lime 800kg in 300Pa, from high hopper,
When white lime granularity 0.2~0.5mm, 9min, when white lime 950kg, 12min being added again, white lime 850kg is added.
Embodiment 2：
(1) converter tapping control endpoint carbon content is 0.05%, and oxygen is determined after stove, and activity oxygen is more than 610ppm, tapping temperature
Control is at 1677 DEG C；
(2) ladle is transported to RH stations, and enter the station 1609 DEG C of thermometric, vacuumizes carry out Decarburization Operation；
(3) after decarburization starts 9min, the vacuum degree of vacuum chamber puts into white lime 970kg in 66.7Pa, from high hopper,
When white lime granularity 0.2~0.5mm, 12min, when white lime 950kg, 15min being added again, white lime 800kg is added.
Embodiment 3：
(1) converter tapping control endpoint carbon content is 0.047%, and oxygen is determined after stove, and activity oxygen is more than 616ppm, tapping temperature
Control is at 1671 DEG C；
(2) ladle is transported to RH stations, and enter the station 1604 DEG C of thermometric, vacuumizes carry out Decarburization Operation；
(3) after decarburization starts 8min, the vacuum degree of vacuum chamber puts into white lime 1020kg in 220Pa, from high hopper,
When white lime granularity 0.2~0.5mm, 11min, when white lime 850kg, 14min being added again, white lime 800kg is added.
The test result three times of table 1
Through examining, the experiment steel that white lime is added using the present invention is compared with comparison tank, at the end of RH decarburizations in molten steel
Carbon content reduce, decarburization time shortens, therefore implementation result of the present invention is apparent, decarburization efficiency raising, the result of molten steel total oxygen
Less than values for normal operation, illustrate that the cleanliness factor of molten steel increases, there is the advantage for being better than routine operation.
Claims (2)
1. a kind of molten steel refining method improving RH decarbonization rates, it is characterised in that the specific steps are：
Step 1：It is 0.045%~0.055% that converter tapping, which controls endpoint carbon content, determines oxygen after stove, activity oxygen is more than
600ppm, tapping temperature are controlled at 1670 DEG C or more；
Step 2：Ladle is transported to RH stations, ensures that inlet temperature is more than 1600 DEG C, vacuumizes carry out Decarburization Operation；
Step 3：Decarburization starts the vacuum degree of 6~9min and vacuum chamber in 500Pa or less, and white lime is added from high hopper,
Addition is 5~15kg/t steel, and white lime granularity is 0.2~0.5mm.
2. a kind of molten steel refining method improving RH decarbonization rates according to claim 1, it is characterised in that the step 3
2~3 batches of additions of middle white lime point, it is 3~5min that interval time, which is added, in every batch of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611142399.2A CN108611465A (en) | 2016-12-13 | 2016-12-13 | A kind of molten steel refining method improving RH decarbonization rates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611142399.2A CN108611465A (en) | 2016-12-13 | 2016-12-13 | A kind of molten steel refining method improving RH decarbonization rates |
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| CN108611465A true CN108611465A (en) | 2018-10-02 |
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| CN201611142399.2A Pending CN108611465A (en) | 2016-12-13 | 2016-12-13 | A kind of molten steel refining method improving RH decarbonization rates |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074712A (en) * | 1991-12-24 | 1993-07-28 | 川崎制铁株式会社 | The method of refining of high purity steel |
| JPH05239535A (en) * | 1992-02-28 | 1993-09-17 | Nippon Steel Corp | Method for melting extreme-low carbon steel |
| JPH05287360A (en) * | 1992-04-06 | 1993-11-02 | Nippon Steel Corp | Method for melting extremely low carbon steel |
| CN104169442A (en) * | 2012-03-15 | 2014-11-26 | 杰富意钢铁株式会社 | Vacuum refining method of molten steel |
-
2016
- 2016-12-13 CN CN201611142399.2A patent/CN108611465A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1074712A (en) * | 1991-12-24 | 1993-07-28 | 川崎制铁株式会社 | The method of refining of high purity steel |
| JPH05239535A (en) * | 1992-02-28 | 1993-09-17 | Nippon Steel Corp | Method for melting extreme-low carbon steel |
| JPH05287360A (en) * | 1992-04-06 | 1993-11-02 | Nippon Steel Corp | Method for melting extremely low carbon steel |
| CN104169442A (en) * | 2012-03-15 | 2014-11-26 | 杰富意钢铁株式会社 | Vacuum refining method of molten steel |
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Application publication date: 20181002 |
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