CN106957941A - Utilize the method for RH decarburization smelting low carbon steel alloys - Google Patents
Utilize the method for RH decarburization smelting low carbon steel alloys Download PDFInfo
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- CN106957941A CN106957941A CN201710147071.8A CN201710147071A CN106957941A CN 106957941 A CN106957941 A CN 106957941A CN 201710147071 A CN201710147071 A CN 201710147071A CN 106957941 A CN106957941 A CN 106957941A
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- CN
- China
- Prior art keywords
- decarburization
- smelting
- steel
- converter
- utilization
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/072—Treatment with gases
-
- 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
Abstract
The invention discloses a kind of method of utilization RH decarburizations smelting low carbon steel alloy, it includes converter smelting, RH processing and LF refining process, the converter smelting process carries out decarburization, and RH treatment process carries out the deep decarburization of oxygen blast and dehydrogenation, and LF refining process carries out deoxidation and alloying.This method alleviates the task that converter carries out deep decarburization, makes full use of the RH for not damaging steel quality to carry out deep decarburization, molten steel is heated up using LF, alloying, it is ensured that pouring molten steel temperature, that is, reduces production cost, in turn ensure that steel quality.This method can mitigate the serious after-blow that the deep decarburization of converter is caused, it is ensured that steel quality, while the cheap low-carbon ferromanganese of price, medium carbon ferrochrome etc. can also be used to carry out alloying, meet the chemical composition requirement of low-carbon alloy steel.
Description
Technical field
The present invention relates to a kind of method for making steel, especially a kind of method of utilization RH decarburizations smelting low carbon steel alloy.
Background technology
Requirement with country to energy-conserving and environment-protective is more and more tighter, further promotes the technological progress of traditional steel industry,
It is mainstream development direction to realize the high intensity of ferrous materials, high tenacity.And realize the primary hand of ferrous materials high intensity, high tenacity
Section is to reduce the carbon content in steel, is strengthened using alloying element.The technological process that tradition is smelted is converter-deoxygenated alloy
Change-LF refining-continuous casting.The contradiction protruded very much is thus occurred in that, from metallurgy angle analysis, using converter to steel
Water carries out deep decarburization, it is considered that when terminal C content in converter molten steel is to less than 0.03%, can cause the serious after-blow of molten steel, shadow
Molten Steel Cleanliness is rung, the internal soundness of steel is lost；On the other hand, if the aim carbon of molten steel is higher than 0.03%, and steel grade is chemical
Component requirements carbon content control is 0.03~0.05%, and manganese content is controlled 1.0~2.0%, and during containing 0.2~0.5%Cr, is
Finished product requirement is met, in alloying process, it is necessary to carried out using high price alloys such as manganese metal, chromic carbide irons, make cost
Rise.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of utilization RH decarburizations smelting low carbon conjunction that can guarantee that steel quality
Jin Gang method.
In order to solve the above technical problems, the technical solution used in the present invention is：It includes converter smelting, RH processing and LF
Refining procedure, the converter smelting process carries out decarburization, and RH treatment process carries out the deep decarburization of oxygen blast and dehydrogenation, and LF refining process is entered
Row deoxidation and alloying.
The decarburization terminal point control carbon content of converter smelting process of the present invention is in 0.04~0.06wt%.The converter smelting
The tapping temperature for refining process is controlled at 1610~1650 DEG C.
The deep decarburization of RH treatment process oxygen blast of the present invention is to carbon content≤0.005wt%.The RH treatment process it is outbound
Temperature control is at 1590~1620 DEG C.
The tapping liquid steel temperature of LF refining process of the present invention is 1570~1600 DEG C.The LF refining process is using low
Carbon ferromanganese and medium carbon ferrochrome carry out alloying.
It is using the beneficial effect produced by above-mentioned technical proposal：Present invention alleviates the work that converter carries out deep decarburization
Task, makes full use of the RH for not damaging steel quality to carry out deep decarburization, molten steel is heated up using LF, alloying, it is ensured that steel
Water pouring temperature, that is, reduce production cost, in turn ensure that steel quality.
The present invention can mitigate the serious after-blow that the deep decarburization of converter is caused, it is ensured that steel quality, while can also use
The cheap low-carbon ferromanganese of price, medium carbon ferrochrome etc. carry out alloying, meet the chemical composition requirement of low-carbon alloy steel.
Embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
Embodiment 1-12：This uses following techniques using the method for RH decarburization smelting low carbon steel alloys.
（1）This method changes traditional process for making flow, has overturned and traditional deoxygenated alloy has been carried out after converter smelting
The pattern of change.Increase RH treatment process in the flow of smelting low carbon steel alloy, deep decarburization, Ran Hou are carried out to molten steel using RH
LF is heated up, and deoxidation alloying is placed in LF refining process and carried out；Its technological process is converter-RH-LF-continuous casting.RH
Carbonization treatment can be carried out to molten steel, its decarburization principle generates under vacuum, decarburization to be carried out using the oxygen in molten steel
CO/CO2Gas, is discharged from molten steel.Both steel quality will not be damaged, can drop to again in steel carbon content very low.Each process
Task also have essential distinction with traditional method, specific contrast is shown in Table 1.
Table 1：The task of this method and conventional method process
| Traditional method for making steel | This method | |
| Converter | Deep decarburization, below 0.03wt% is dropped to by aim carbon；Use manganese metal, chromic carbide iron alloying | Decarburization, aim carbon is controlled in 0.04~0.06wt% or so |
| RH | Dehydrogenation | The decarburization of oxygen blast depth, dehydrogenation |
| LF | Fine tune temperature, trimming, uniform temperature and composition | Heating, deoxidation, using low-carbon ferromanganese, medium carbon ferrochrome alloying, |
（2）Converter smelting process：This method is applied to smelt 0.03~0.05wt% of C, Mn 1.0~2.0wt% steel grades, or C
The steel grades such as 0.03~0.05wt%, 1.0~2.0wt% of Mn, 0.2~0.5wt% of Cr.Embodiment 1-12 smelt C in steel grade,
Mn, Cr product objective content and converter terminal carbon are shown in Table 2.
Table 2：The target chemical composition and converter terminal carbon of each embodiment（wt%）
| C | Mn | Cr | Converter terminal carbon | Converter tapping liquid steel temperature/DEG C | |
| Embodiment 1 | 0.03~0.05 | 1.0 | 0.2 | 0.06 | 1630 |
| Embodiment 2 | 0.03~0.05 | 2.0 | 0.3 | 0.04 | 1650 |
| Embodiment 3 | 0.03~0.05 | 1.5 | 0.4 | 0.05 | 1640 |
| Embodiment 4 | 0.03~0.05 | 1.2 | 0.5 | 0.06 | 1620 |
| Embodiment 5 | 0.03~0.05 | 2.0 | 0.2 | 0.04 | 1610 |
| Embodiment 6 | 0.03~0.05 | 1.6 | 0.3 | 0.05 | 1630 |
| Embodiment 7 | 0.03~0.05 | 1.4 | 0.4 | 0.06 | 1640 |
| Embodiment 8 | 0.03~0.05 | 1.0 | 0.5 | 0.04 | 1620 |
| Embodiment 9 | 0.03~0.05 | 2.0 | 0.2 | 0.05 | 1650 |
| Embodiment 10 | 0.03~0.05 | 1.6 | 0.2 | 0.06 | 1610 |
| Embodiment 11 | 0.03~0.05 | 1.4 | 0.5 | 0.04 | 1630 |
| Embodiment 12 | 0.03~0.05 | 1.0 | 0.4 | 0.05 | 1620 |
C, Mn, Cr content are the component requirements after finished product requirement, i.e. LF refining in table 2；Converter terminal carbon and converter tapping steel
Coolant-temperature gage is the technological requirement of converter smelting process.
（3）RH treatment process：The deep decarburization of oxygen blast and dehydrogenation are carried out, endpoint carbon content after each embodiment RH processing and is gone out
Steel liquid steel temperature is shown in Table 3.
Table 3：Aim carbon and tapping liquid steel temperature after each embodiment RH processing
| Aim carbon/wt% after RH processing | RH tappings liquid steel temperature/DEG C | |
| Embodiment 1 | 0.005 | 1600 |
| Embodiment 2 | 0.003 | 1590 |
| Embodiment 3 | 0.004 | 1597 |
| Embodiment 4 | 0.003 | 1610 |
| Embodiment 5 | 0.004 | 1595 |
| Embodiment 6 | 0.002 | 1614 |
| Embodiment 7 | 0.004 | 1605 |
| Embodiment 8 | 0.003 | 1598 |
| Embodiment 9 | 0.005 | 1620 |
| Embodiment 10 | 0.004 | 1599 |
| Embodiment 11 | 0.003 | 1613 |
| Embodiment 12 | 0.003 | 1592 |
（4）LF refining process：Carry out deoxidation and alloying；Mn or Mn, Cr alloying are carried out using low-carbon ferromanganese and medium carbon ferrochrome,
And needed liquid steel temperature being increased to 1570~1600 DEG C according to continuous casting；The trade mark of the low-carbon ferromanganese is FeMn84C0.7, is changed
Study and be divided into 80%Mn, 0.5~1.0%C；The FeCr69C2.0 of the medium carbon ferrochrome, chemical composition is 70%Cr, 1.0~2.0%C；
In alloying process, C, Mn absorptivity of low-carbon ferromanganese are 95%, and C, Cr absorptivity of medium carbon ferrochrome are 95%.The tool of each embodiment
Body LF refining technological parameter is shown in Table 4.
Table 4：The LF refining technique of each embodiment
C, Mn, Cr content are the component content after finished product content, i.e. LF refining in table 4.
Claims (7)
1. a kind of method of utilization RH decarburizations smelting low carbon steel alloy, it includes converter smelting, RH processing and LF refining process, its
It is characterised by：The converter smelting process carries out decarburization, and RH treatment process carries out the deep decarburization of oxygen blast and dehydrogenation, and LF refining process is entered
Row deoxidation and alloying.
2. the method for utilization RH decarburizations smelting low carbon steel alloy according to claim 1, it is characterised in that：The converter smelting
The decarburization terminal point control carbon content of process is refined in 0.04~0.06wt%.
3. the method for utilization RH decarburizations smelting low carbon steel alloy according to claim 2, it is characterised in that：The converter smelting
The tapping temperature for refining process is controlled at 1610~1650 DEG C.
4. the method for utilization RH decarburizations smelting low carbon steel alloy according to claim 1, it is characterised in that：The RH processing
Process oxygen blast depth decarburization is to carbon content≤0.005wt%.
5. the method for utilization RH decarburizations smelting low carbon steel alloy according to claim 4, it is characterised in that：The RH processing
The out-station temperature of process is controlled at 1590~1620 DEG C.
6. the method for the utilization RH decarburization smelting low carbon steel alloys according to claim 1-5 any one, its feature exists
In：The tapping liquid steel temperature of the LF refining process is 1570~1600 DEG C.
7. the method for utilization RH decarburizations smelting low carbon steel alloy according to claim 6, it is characterised in that：The LF refining
Process carries out alloying using low-carbon ferromanganese and medium carbon ferrochrome.
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| CN201710147071.8A CN106957941A (en) | 2017-03-13 | 2017-03-13 | Utilize the method for RH decarburization smelting low carbon steel alloys |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113337677A (en) * | 2021-05-12 | 2021-09-03 | 安阳钢铁股份有限公司 | Method for further decarbonizing converter molten steel after tapping and in LF (ladle furnace) process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103627853A (en) * | 2013-12-05 | 2014-03-12 | 广东韶钢松山股份有限公司 | Method for manufacturing low-carbon and low-silicon steel |
| CN104404355A (en) * | 2014-11-19 | 2015-03-11 | 南京钢铁股份有限公司 | Smelting process for anti-knock mild steel medium-thickness slab |
-
2017
- 2017-03-13 CN CN201710147071.8A patent/CN106957941A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103627853A (en) * | 2013-12-05 | 2014-03-12 | 广东韶钢松山股份有限公司 | Method for manufacturing low-carbon and low-silicon steel |
| CN104404355A (en) * | 2014-11-19 | 2015-03-11 | 南京钢铁股份有限公司 | Smelting process for anti-knock mild steel medium-thickness slab |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113337677A (en) * | 2021-05-12 | 2021-09-03 | 安阳钢铁股份有限公司 | Method for further decarbonizing converter molten steel after tapping and in LF (ladle furnace) process |
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