CN106755709A - Chromium method is matched somebody with somebody in a kind of converter of low-carbon (LC) containing Cr steel alloys - Google Patents
Chromium method is matched somebody with somebody in a kind of converter of low-carbon (LC) containing Cr steel alloys Download PDFInfo
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- CN106755709A CN106755709A CN201611051044.2A CN201611051044A CN106755709A CN 106755709 A CN106755709 A CN 106755709A CN 201611051044 A CN201611051044 A CN 201611051044A CN 106755709 A CN106755709 A CN 106755709A
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- ferrochrome
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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
- 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
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
Match somebody with somebody chromium method the invention discloses a kind of converter of low-carbon (LC) containing Cr steel alloys, belong to pneumatic steelmaking field.In the converter smelting later stage, after decarburization heats up, stop oxygen blast, add ferrochrome, the tapping after outlet temperature and carbon content are up to standard, in ladle plus aluminium carries out deoxidation treatment in tapping process, molten steel Cr contents reach 5.0~5.3%.Chromium method is matched somebody with somebody in converter of the low-carbon (LC) disclosed by the invention containing Cr steel alloys, alloy is based on high carbon ferro-chrome, reasonably combined chromic carbide iron, cost of alloy is low, Cr element recovery rates are high, endpoint molten steel carbon content meets the disposal ability of follow-up vacuum refining, while in economization plus ferrosilicon or aluminum reduction slag the step of Cr elements, low production cost, it is good in economic efficiency.
Description
Technical field
The invention belongs to process for making field, and in particular to chromium method is matched somebody with somebody in a kind of converter of low-carbon (LC) containing Cr steel alloys.
Background technology
When producing chrome-bearing steel using bof process, the feed postition of general ferrochrome is incorporated into ladle, Huo Zhe
Added during tapping or added during LF refining, mainly add chromic carbide iron, cost of alloy is higher.And, in LF essences
When adding ferrochrome during refining, because liquid steel temperature is low and programming rate is slower, to avoid liquid steel temperature too low, alloy is past
Toward needing point 3~4 batches to add, smelting cycle is more long, larger with front and rear process matching difficulty.If ferrochrome blows in converter
Added in oxygen smelting process, then Cr element oxides are more, in order to improve yield of alloy, it is necessary to be added after alloy melting a large amount of
Ferrosilicon or aluminium carry out reduction treatment to slag, not only increase alloy consumption, and extend the converter smelting cycle.
Patent CN103642967A discloses a kind of method of converter producing high chrome, to avoid disposably adding a large amount of chromium
The excessive problem of molten steel temperature drop that sheet iron strip comes, takes converter terminal high temperature tapping (temperature is 1675~1690 DEG C), in batches
The method for adding ferrochrome.Wherein, during first ferrochrome is added to ladle in converter tapping process, remaining ferrochrome is at LF refining
Added during reason, the ferrochrome for adding of tapping is medium carbon ferrochrome, and addition is only 36~45kg/t, and tapping terminates ladle molten steel
Cr contents are less than 2.5%.According to transmission principle correlation theory, temperature-difference is the power of heat transmission, and temperature is higher, and the temperature difference is got over
Greatly, heat is also bigger, and for converter tapping process, tapping temperature more high heat loss is bigger.Thus, gone out using converter is improved
The method of steel temperature increases the purpose of ladle alloy addition to reach, in fact, increased system heat losses, reduces and is
The heat utilization ratio of system.Patent CN103352168A discloses a kind of low-carbon high-chromium steel and its converter smelting process, and the technique exists
Chromic carbide iron is added during LF refining in four batches, molten steel Cr contents is reached 4.5%~5.5%.The technique ferrochrome is complete
Portion is chromic carbide iron, and cost of alloy is higher, and alloy adds the duration more long, and the LF refining time is smart more than 85 minutes
The refining cycle rhythm of production with converter and continuous casting more long is mismatched.
Therefore, ferrochrome addition is big in being smelted for low-carbon (LC) Li-adding Al alloy, causes that cost of alloy is high, molten steel temperature drop is big asks
A kind of topic, it is desirable to provide ferrochrome Adding Way for being capable of reasonable control process temperature.
The content of the invention
In order to solve the deficiencies in the prior art, being capable of reasonable control process it is an object of the invention to provide one kind
The ferrochrome Adding Way of temperature.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that：
Chromium method is matched somebody with somebody in a kind of converter of low-carbon (LC) containing Cr steel alloys, it is characterised in that in the converter smelting later stage, work as bath temperature
It is not less than 1700 DEG C, carbon content is when being not higher than 0.05%, stops oxygen blast, add ferrochrome, the ferrochrome of addition is high-carbon
Ferrochrome and chromic carbide iron, high carbon ferro-chrome addition are 35~60kg/t, and chromic carbide iron addition is 35~50kg/t, ferrochrome
Tapped after fusing.
Preferably, after converter of the described low-carbon (LC) containing Cr steel alloys is added with ferrochrome in chromium method, do not blown in converter
Oxygen, is not added with ferrosilicon or aluminium powder, increases bottom blowing.
Preferably, converter of the described low-carbon (LC) containing Cr steel alloys is with Cr contents in molten steel after ferrochrome fusing in chromium method
It is 5.0~5.3%, terminal tapping temperature is 1590~1620 DEG C, and carbon content of molten steel is 0.25%~0.40%, in tapping process
Deoxygenation of liquid steel is processed to aluminium is added in ladle.
Compared with prior art, the present invention at least has the advantages that：
1. the present invention reduces the use cost of ferrochrome by reasonably combined high carbon ferro-chrome and chromic carbide iron；Increase
Bottom blowing under the collective effect in high temperature molten bath by alloy melting, using the silicon unit in the high oxidative oxide alloy of molten bath and slag
Element compensation temperature drop, carbon content of molten steel meets the decarburization capacity of follow-up vacuum refining after alloy melting, and technique does not increase refining excessively
Difficulty so that converter-refining-continuous casting is more matched on rhythm of production；
2. after ferrochrome is added, without oxygen blast operation in converter, the recovery rate of alloy Cr elements, and economization are improve
To the operation that Cr elements in ferrosilicon or aluminum reduction slag are added in stove so that Converter production period saves height while shortening
The smelting cost of chromium steel；
3. stop oxygen blast in converter high temperature low-carbon (LC) and add ferrochrome, it is to avoid it is excessive that the tapping of converter high temperature is produced
Thermal loss, increased the addition of alloy, improve the Cr contents of converter smelting endpoint molten steel.
Specific embodiment
Below with the production instance of 180 tons of converters, smelting low carbon containing Cr steel alloys, the invention will be further described.
Embodiment 1
The oxygen blast in converter of deep dephosphorization molten iron is smelted and carries out decarburization intensification, and in molten bath, the temperature of molten steel is 1740 DEG C, carbon contains
Measure for 0.028% when, stop oxygen blast, it is 400 DEG C of ferrochrome to add preheating temperature, wherein, high carbon ferro-chrome 10.2t, micro- carbon
Ferrochrome 6.4t.After ferrochrome is added, not oxygen blast in converter is not added with ferrosilicon or aluminium powder, increases bottom blowing.Terminal tapping temperature is
1620 DEG C, carbon content of molten steel is 0.40%, to addition aluminium 100kg in ladle to deoxygenation of liquid steel treatment, molten steel Cr in tapping process
Content is 5.26%.
Embodiment 2
The oxygen blast in converter of deep dephosphorization molten iron is smelted and carries out decarburization intensification, and in molten bath, the temperature of molten steel is 1710 DEG C, carbon contains
Measure for 0.046% when, stop oxygen blast, it is 400 DEG C of ferrochrome to add preheating temperature, wherein, high carbon ferro-chrome 6.5t, micro- carbon chromium
Iron 8.9t.After ferrochrome is added, not oxygen blast in converter is not added with ferrosilicon or aluminium powder, increases bottom blowing.Terminal tapping temperature is
1590 DEG C, carbon content of molten steel is 0.25%, to addition aluminium 120kg in ladle to deoxygenation of liquid steel treatment, molten steel Cr in tapping process
Content is 5.02%.
Although embodiment of the present invention is disclosed as above, for those skilled in the art, can be easily real
Now other modification, therefore under the universal limited without departing substantially from claim and equivalency range, the present invention is not limited to
Specific details.
Claims (3)
1. chromium method is matched somebody with somebody in converter of a kind of low-carbon (LC) containing Cr steel alloys, it is characterised in that in the converter smelting later stage, when bath temperature not
When being not higher than 0.05% less than 1700 DEG C, carbon content, stop oxygen blast, add ferrochrome, the ferrochrome of addition is high carbon chromium
Iron and chromic carbide iron, high carbon ferro-chrome addition are 35~60kg/t, and chromic carbide iron addition is 35~50kg/t, and ferrochrome melts
Tapped after change.
2. chromium method is matched somebody with somebody in converter of the low-carbon (LC) according to claim 1 containing Cr steel alloys, it is characterised in that：Described ferrochrome is closed
After gold is added, not oxygen blast in converter is not added with ferrosilicon or aluminium powder, increases bottom blowing.
3. chromium method is matched somebody with somebody in converter of the low-carbon (LC) according to claim 1 containing Cr steel alloys, it is characterised in that：Described ferrochrome is closed
Cr contents are 5.0~5.3% in molten steel after gold fusing, and terminal tapping temperature is 1590~1620 DEG C, and carbon content of molten steel is
0.25%~0.40%, to addition aluminium in ladle to deoxygenation of liquid steel treatment in tapping process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051044.2A CN106755709B (en) | 2016-11-25 | 2016-11-25 | Chromium method is matched in a kind of converter of low-carbon steel alloy containing Cr |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051044.2A CN106755709B (en) | 2016-11-25 | 2016-11-25 | Chromium method is matched in a kind of converter of low-carbon steel alloy containing Cr |
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| CN106755709A true CN106755709A (en) | 2017-05-31 |
| CN106755709B CN106755709B (en) | 2019-02-01 |
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| CN201611051044.2A Active CN106755709B (en) | 2016-11-25 | 2016-11-25 | Chromium method is matched in a kind of converter of low-carbon steel alloy containing Cr |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108385014A (en) * | 2018-03-27 | 2018-08-10 | 盐城市鑫洋电热材料有限公司 | A kind of preparation method of ferrochrome |
| CN114438397A (en) * | 2022-02-08 | 2022-05-06 | 新疆八一钢铁股份有限公司 | Production process of high-chromium corrosion-resistant sucker rod |
| CN114908208A (en) * | 2022-04-18 | 2022-08-16 | 包头钢铁（集团）有限责任公司 | Method for smelting high alloy steel with Mn content of more than 12% by using converter end point temperature |
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| CN101333579A (en) * | 2008-08-06 | 2008-12-31 | 攀钢集团成都钢铁有限责任公司 | Method for producing tube blank steel for nuclear electricity |
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| CN102453831A (en) * | 2010-10-26 | 2012-05-16 | 攀钢集团钢铁钒钛股份有限公司 | Method for smelting high-chromium steel and high-chromium steel |
| CN103045948A (en) * | 2012-12-26 | 2013-04-17 | 攀钢集团攀枝花钢钒有限公司 | High-chromium steel and manufacturing method thereof |
| CN105755357A (en) * | 2016-03-29 | 2016-07-13 | 宁国市开源电力耐磨材料有限公司 | Smelting method of low-carbon high-chromium steel and low-carbon high-chromium steel prepared through method |
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| CN1873037A (en) * | 2005-05-30 | 2006-12-06 | 宝山钢铁股份有限公司 | Method for smelting carbon dioxide corrosion resistant steel |
| CN1876857A (en) * | 2005-06-11 | 2006-12-13 | 太原钢铁(集团)有限公司 | Method for smelting stainless steel using molten iron as raw material |
| CN101333579A (en) * | 2008-08-06 | 2008-12-31 | 攀钢集团成都钢铁有限责任公司 | Method for producing tube blank steel for nuclear electricity |
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| CN102453831A (en) * | 2010-10-26 | 2012-05-16 | 攀钢集团钢铁钒钛股份有限公司 | Method for smelting high-chromium steel and high-chromium steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108385014A (en) * | 2018-03-27 | 2018-08-10 | 盐城市鑫洋电热材料有限公司 | A kind of preparation method of ferrochrome |
| CN114438397A (en) * | 2022-02-08 | 2022-05-06 | 新疆八一钢铁股份有限公司 | Production process of high-chromium corrosion-resistant sucker rod |
| CN114908208A (en) * | 2022-04-18 | 2022-08-16 | 包头钢铁（集团）有限责任公司 | Method for smelting high alloy steel with Mn content of more than 12% by using converter end point temperature |
| CN114908208B (en) * | 2022-04-18 | 2023-09-26 | 包头钢铁（集团）有限责任公司 | Method for smelting high alloy steel with Mn content of more than 12% by utilizing converter end temperature |
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