CN106011385A - Smelting method for non-sedated molten steel - Google Patents
Smelting method for non-sedated molten steel Download PDFInfo
- Publication number
- CN106011385A CN106011385A CN201610450922.1A CN201610450922A CN106011385A CN 106011385 A CN106011385 A CN 106011385A CN 201610450922 A CN201610450922 A CN 201610450922A CN 106011385 A CN106011385 A CN 106011385A
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- CN
- China
- Prior art keywords
- molten steel
- sedating
- smelting process
- vacuum
- smelting
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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
- C21C7/0025—Adding carbon material
Abstract
The invention belongs to the technical field of steelmaking and discloses a smelting method for non-sedated molten steel. The smelting method includes the steps that the post-furnace carbon content, the molten steel temperature and the oxygen content of the molten steel are obtained; carburant is put into the molten steel with the post-furnace carbon content b, the molten steel temperature and the oxygen content a as the basis; and the molten steel is treated through an RH vacuum smelting technology. By means of the smelting method, low-oxygen-position stable control before vacuum smelting is achieved, consumption of desoxidant and generation of deoxidization products are greatly reduced, and the purity and the smelting efficiency of the molten steel are improved.
Description
Technical field
The present invention relates to steelmaking technical field, particularly to the smelting process of a kind of non-sedating molten steel.
Background technology
Unkilled steel is widely used in, the every aspect of national life.Smelt the side of non-sedating molten steel at present
Formula is the tapping of converter non-sedating, and when refine is entered the station, molten steel is boiling steel, containing higher oxygen activity, at RH
First processing procedure carries out decarburizing reaction, then in the calm process carrying out molten steel by adding deoxidizer.
Aforesaid operations consumes more deoxidizer, produces substantial amounts of deoxidation products, and deoxidation products is the most most
Number is present in molten steel with the form of field trash, produces bigger to Molten Steel Cleanliness and subsequent product quality
Impact.
Summary of the invention
The present invention provides the smelting process of a kind of non-sedating molten steel, consumes substantial amounts of in solution prior art
Deoxidizer, produces substantial amounts of deoxidation products, has a strong impact on the technical problem of molten steel purity.
For solving above-mentioned technical problem, the invention provides the smelting process of a kind of non-sedating molten steel, bag
Include:
Obtain furnace rear carbon content, liquid steel temperature and the oxygen content of molten steel；
With described furnace rear carbon content b, described liquid steel temperature and described oxygen content a as foundation, Xiang Gang
Water puts into carburant；
By RH vacuum metling PROCESS FOR TREATMENT molten steel.
Further, the foundation to molten steel input carbon dust includes:
In the case of the difference of a Yu 0.9b is more than or equal to 250ppm, put into carburant.
Further, the amount putting into carbon dust calculates, according to the oxygen content more than needed of molten steel, the carburetting dosage put into；
Wherein, the computing formula of described oxygen content c more than needed is: c=a-0.9b-250；Measurement unit
For ppm.
Further, described RH vacuum metling technique includes: vacuum deaeration and deoxidation alloying behaviour
Make；
Wherein, after vacuum deaeration completes, obtain molten steel determines oxygen numerical value, and determines oxygen numerical value according to described,
Add appropriate deoxidizer and carry out deoxidation alloying operation.
Further, after described vacuum deaeration process completes, molten steel oxygen activity is less than or equal to 270ppm.
Further, during described vacuum deaeration, in stove, vacuum is maintained at 2kpa.
Further, during described vacuum deaeration, in stove, vacuum cycle gas flow exists
120NL/min。
Further, described vacuum deaeration process keeps 7min or more than 7min.
Further, the Tapping Temperature of Bof of molten steel controls at 1665 DEG C～1680 DEG C.
Further, described carburant is carbon dust.
The one or more technical schemes provided in the embodiment of the present application, at least have the following technical effect that
Or advantage:
1, the smelting process of the non-sedating molten steel provided in the embodiment of the present application, as a kind of RH vacuum
The smelting process of carbon deoxidation, arrives at a station the temperature of molten steel, oxygen content and furnace rear carbon content according to RH,
RH application of vacuum carries out pre-deoxidation operation by the suitable carburant of addition before starting, and on the one hand increases
Add carbon content in molten steel to consume oxygen superfluous in molten steel, thus reduce decarburization and terminate oxygen activity, be in
Controllable state, the consumption of deoxidizer when reducing final deoxidizing；On the other hand, greatly reduce after deoxidation terminates
Al2O3Deng the generation of field trash, improve Molten Steel Cleanliness.
2, the smelting process of the non-sedating molten steel provided in the embodiment of the present application, passes through under vacuum
Using carbon as deoxidant element, its deoxidation products is extremely low to the pollution of molten steel, improves further
Molten steel purity.
Accompanying drawing explanation
The smelting process flow chart of the non-sedating molten steel that Fig. 1 provides for the embodiment of the present invention.
Detailed description of the invention
The embodiment of the present application, by providing the smelting process of a kind of non-sedating molten steel, solves in prior art
Consume substantial amounts of deoxidizer, produce substantial amounts of deoxidation products, have a strong impact on the technical problem of molten steel purity；
Reach stable molten steel oxygen activity in low-level, reduce consumption and the generation of field trash by-product of deoxidizer,
Promote the technique effect of molten steel purity.
For solving above-mentioned technical problem, the general thought of the embodiment of the present application offer technical scheme is as follows:
A kind of smelting process of non-sedating molten steel, including:
Obtain furnace rear carbon content, liquid steel temperature and the oxygen content of molten steel；
With described furnace rear carbon content b, described liquid steel temperature and described oxygen content a as foundation, Xiang Gang
Water puts into carburant；
By RH vacuum metling PROCESS FOR TREATMENT molten steel.
By foregoing it can be seen that arrive at a station the temperature of molten steel, oxygen content and furnace rear carbon according to RH
Content, to regulate and control deoxidation behaviour by the calculating suitable carburant of addition before RH application of vacuum starts
Make, control to terminate oxygen activity in the range of 250ppm～270ppm so that oxygen activity control before low deoxidation
System is in low-level and controllable state, the consumption of deoxidizer when reducing deoxidation, thus reduces deoxidation products
The generation of field trash, and then significantly alleviate its impact on molten steel purity, promote molten steel purity.
In order to be better understood from technique scheme, below in conjunction with Figure of description and concrete reality
Technique scheme is described in detail by mode of executing, it should be understood that the embodiment of the present invention and embodiment
In specific features be the detailed description to technical scheme rather than to present techniques side
The restriction of case, in the case of not conflicting, the technical characteristic in the embodiment of the present application and embodiment can
To be mutually combined.
See Fig. 1, the smelting process of a kind of non-sedating molten steel that the embodiment of the present invention provides, including:
Obtain furnace rear carbon content, liquid steel temperature and the oxygen content of molten steel；
With described furnace rear carbon content b, described liquid steel temperature and described oxygen content a as foundation, Xiang Gang
Water puts into carburant；
By RH vacuum metling PROCESS FOR TREATMENT molten steel.
Described method will be introduced respectively below.
Arrive at a station according to RH the temperature of molten steel, i.e. reach after the deoxidation of smelting process requires when liquid steel temperature
Carry out following step.
Arrive at a station the oxygen content of molten steel and furnace rear carbon content according to RH, logical before RH application of vacuum starts
Cross the calculating suitable carburant of addition and carry out pre-deoxidation operation.Specifically, described carburant is carbon dust.
Its deoxidation products produced, the pollution to molten steel is extremely low.
Concrete, the foundation putting into carbon dust to molten steel includes: the difference at a with 0.9b is more than or equal to
In the case of 250ppm, put into carburant；Consume oxygen more than needed.
Further, the amount putting into carbon dust calculates, according to the oxygen content more than needed of molten steel, the carburetting dosage put into；
Wherein, the computing formula of described oxygen content c more than needed is: c=a-0.9b-250；Measurement unit
For ppm；That is, with oxygen content more than needed as foundation, consumption oxygen more than needed as far as possible, specifically,
After described vacuum deaeration process completes, molten steel oxygen activity is less than or equal to 270ppm.
Therefore, described RH vacuum metling technique includes: vacuum deaeration and deoxidation alloying operation；
Wherein, after vacuum deaeration completes, obtain molten steel determines oxygen numerical value, and determines oxygen numerical value according to described, adds
Enter appropriate deoxidizer and carry out deoxidation alloying operation, wherein, according to steel grades require to carry out for
Property alloying operation.
During described vacuum deaeration, in stove, vacuum is maintained at 2kpa, vacuum cycle gas in stove
Flow is at 120NL/min, and described vacuum deaeration process keeps 7min or more than 7min.
The Tapping Temperature of Bof of molten steel controls at 1665 DEG C～1680 DEG C, tapping process not deoxidation, is not added with
Alloy and carburant.
The one or more technical schemes provided in the embodiment of the present application, at least have the following technical effect that
Or advantage:
1, the smelting process of the non-sedating molten steel provided in the embodiment of the present application, as a kind of RH vacuum
The smelting process of carbon deoxidation, arrives at a station the temperature of molten steel, oxygen content and furnace rear carbon content according to RH,
RH application of vacuum carries out pre-deoxidation operation by the suitable carburant of addition before starting, and on the one hand increases
Add carbon content in molten steel to consume oxygen superfluous in molten steel, thus reduce decarburization and terminate oxygen activity, be in
Controllable state, the consumption of deoxidizer when reducing final deoxidizing；On the other hand, greatly reduce after deoxidation terminates
Al2O3Deng the generation of field trash, improve Molten Steel Cleanliness.
2, the smelting process of the non-sedating molten steel provided in the embodiment of the present application, passes through under vacuum
Using carbon as deoxidant element, its deoxidation products is extremely low to the pollution of molten steel, improves further
Molten steel purity.
It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme
And unrestricted, although the present invention being described in detail with reference to example, the ordinary skill people of this area
Member should be appreciated that and can modify technical scheme or equivalent, without deviating from
The spirit and scope of technical solution of the present invention, it all should be contained in the middle of scope of the presently claimed invention.
Claims (10)
1. the smelting process of a non-sedating molten steel, it is characterised in that including:
Obtain furnace rear carbon content b of molten steel, liquid steel temperature and oxygen content a；
According to described furnace rear carbon content b, described liquid steel temperature and described oxygen content a, it is determined whether need
Carburant is put in described molten steel；
By molten steel described in RH vacuum metling PROCESS FOR TREATMENT.
2. the smelting process of non-sedating molten steel as claimed in claim 1, it is characterised in that described
According to described furnace rear carbon content b, described liquid steel temperature and described oxygen content a, it is determined whether need to institute
State input carburant in molten steel；
Particularly as follows: when the difference of a Yu 0.9b is more than or equal to 250ppm, determines and throw to described molten steel
Enter carburant.
3. the smelting process of non-sedating molten steel as claimed in claim 2, it is characterised in that described smelting
Smelting method also includes:
Obtain the oxygen content more than needed of described molten steel；
According to the oxygen content more than needed of described molten steel, determine the amount of the described carburant putting into described molten steel；
Wherein, the computing formula of described oxygen content c more than needed is: c=a-0.9b-250；Measurement unit
For ppm.
4. the smelting process of non-sedating molten steel as claimed in claim 3, it is characterised in that described
RH vacuum metling technique includes: vacuum deaeration and deoxidation alloying operation；
Wherein, after vacuum deaeration completes, obtain molten steel determines oxygen numerical value, and determines oxygen numerical value according to described,
Add appropriate deoxidizer and carry out deoxidation alloying operation.
5. the smelting process of non-sedating molten steel as claimed in claim 4, it is characterised in that: described
After vacuum deaeration process completes, molten steel oxygen activity is less than or equal to 270ppm.
6. the smelting process of non-sedating molten steel as claimed in claim 5, it is characterised in that: described
During vacuum deaeration, in stove, vacuum is maintained at 2kpa.
7. the smelting process of non-sedating molten steel as claimed in claim 6, it is characterised in that: described
During vacuum deaeration, in stove, vacuum cycle gas flow is at 120NL/min.
8. the smelting process of non-sedating molten steel as claimed in claim 7, it is characterised in that: described very
Empty deoxidation process keeps 7min or more than 7min.
9. the smelting process of non-sedating molten steel as claimed in claim 8, it is characterised in that: molten steel
Tapping Temperature of Bof controls at 1665 DEG C～1680 DEG C.
10. the smelting process of the non-sedating molten steel as described in any one of claim 1～9, its feature exists
In: described carburant is carbon dust.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610450922.1A CN106011385A (en) | 2016-06-21 | 2016-06-21 | Smelting method for non-sedated molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610450922.1A CN106011385A (en) | 2016-06-21 | 2016-06-21 | Smelting method for non-sedated molten steel |
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| CN106011385A true CN106011385A (en) | 2016-10-12 |
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| CN201610450922.1A Pending CN106011385A (en) | 2016-06-21 | 2016-06-21 | Smelting method for non-sedated molten steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111705178A (en) * | 2020-06-02 | 2020-09-25 | 马鞍山钢铁股份有限公司 | Method for controlling oxygen content in molten steel RH vacuum refining furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103602784A (en) * | 2013-11-20 | 2014-02-26 | 武汉钢铁(集团)公司 | Method for deoxidizing in RH (Relative Humidity) vacuum furnace |
| CN105002328A (en) * | 2015-07-17 | 2015-10-28 | 邯钢集团邯宝钢铁有限公司 | IF steel RH vacuum recarburization deoxygenation control method |
-
2016
- 2016-06-21 CN CN201610450922.1A patent/CN106011385A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103602784A (en) * | 2013-11-20 | 2014-02-26 | 武汉钢铁(集团)公司 | Method for deoxidizing in RH (Relative Humidity) vacuum furnace |
| CN105002328A (en) * | 2015-07-17 | 2015-10-28 | 邯钢集团邯宝钢铁有限公司 | IF steel RH vacuum recarburization deoxygenation control method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111705178A (en) * | 2020-06-02 | 2020-09-25 | 马鞍山钢铁股份有限公司 | Method for controlling oxygen content in molten steel RH vacuum refining furnace |
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