CN106755709B - Method for preparing chromium from low-carbon Cr-containing alloy steel by converter - Google Patents
Method for preparing chromium from low-carbon Cr-containing alloy steel by converter Download PDFInfo
- Publication number
- CN106755709B CN106755709B CN201611051044.2A CN201611051044A CN106755709B CN 106755709 B CN106755709 B CN 106755709B CN 201611051044 A CN201611051044 A CN 201611051044A CN 106755709 B CN106755709 B CN 106755709B
- Authority
- CN
- China
- Prior art keywords
- converter
- carbon
- ferrochrome
- low
- added
- 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.)
- Active
Links
- 239000011651 chromium Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 26
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 11
- 229910000851 Alloy steel Inorganic materials 0.000 title abstract 2
- 229910000604 Ferrochrome Inorganic materials 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 25
- 239000000956 alloy Substances 0.000 claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000010079 rubber tapping Methods 0.000 claims abstract description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 7
- 238000007664 blowing Methods 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 9
- 239000004411 aluminium Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 6
- 238000006392 deoxygenation reaction Methods 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- ZBHWCYGNOTVMJB-UHFFFAOYSA-N [C].[Cr].[Fe] Chemical compound [C].[Cr].[Fe] ZBHWCYGNOTVMJB-UHFFFAOYSA-N 0.000 claims 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 238000007670 refining Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005261 decarburization Methods 0.000 abstract description 4
- 239000002893 slag Substances 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 abstract 2
- 229910001339 C alloy Inorganic materials 0.000 abstract 1
- 238000002156 mixing Methods 0.000 abstract 1
- 238000009628 steelmaking Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a method for preparing chromium from a low-carbon alloy steel containing Cr in a converter, belonging to the field of converter steelmaking. And in the later stage of smelting in the converter, after decarburization and temperature rise, stopping oxygen blowing, adding ferrochrome, tapping after the end temperature and the carbon content reach the standard, adding aluminum into a steel ladle in the tapping process for deoxidation treatment, wherein the Cr content of the molten steel reaches 5.0-5.3%. The converter chromium-blending method of the low-carbon Cr-containing alloy steel disclosed by the invention has the advantages that the alloy mainly comprises high-carbon ferrochrome, the micro-carbon ferrochrome is reasonably matched, the alloy cost is low, the Cr element yield is high, the carbon content of the molten steel at the end point meets the processing capacity of subsequent vacuum refining, the step of adding the Cr element in ferrosilicon or aluminum powder reducing slag is reduced, the production cost is low, and the economic benefit is good.
Description
Technical field
The invention belongs to process for making fields, and in particular to chromium method is matched in a kind of converter of low-carbon steel alloy containing Cr.
Background technique
When producing chrome-bearing steel using bof process, the adding manner of general ferrochrome is incorporated into ladle, Huo Zhe
It is added when tapping or is added during LF refining, mainly addition chromic carbide iron, cost of alloy are higher.Moreover, in LF essence
When ferrochrome being added during refining, since liquid steel temperature is low and heating rate is slower, to avoid liquid steel temperature too low, alloy is past
Toward needing point 3~4 batches to be added, smelting cycle is longer, larger with front and back process matching difficulty.If ferrochrome is blown in converter
It is added in oxygen smelting process, then Cr element oxide is more, in order to improve yield of alloy, needs to be added after alloy melting a large amount of
Ferrosilicon or aluminium carry out reduction treatment to clinker, not only increase alloy consumption, and extend the converter smelting period.
Patent CN103642967A discloses a kind of method of converter producing high chrome, to avoid being added at one time a large amount of chromium
The excessive problem of iron bring molten steel temperature drop takes converter terminal high temperature and taps (temperature is 1675~1690 DEG C), in batches
The method that ferrochrome is added.Wherein, first ferrochrome is added in ladle in converter tapping process, remaining ferrochrome is at LF refining
It is added during reason, the ferrochrome for addition of tapping is medium carbon ferrochrome, and additional amount is only 36~45kg/t, and tapping terminates ladle molten steel
Cr content is 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 is to achieve the purpose that increase ladle alloy addition, in fact, increase 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, the technique exist
Chromic carbide iron is added in four batches during LF refining, molten steel Cr content is made to reach 4.5%~5.5%.The technique ferrochrome is complete
Portion is chromic carbide iron, and cost of alloy is higher, and the alloy addition duration is longer, and the LF refining time is smart at 85 minutes or more
The rhythm of production for refining longer period and converter and continuous casting mismatches.
Therefore, big for ferrochrome additional amount in the smelting of low-carbon Li-adding Al alloy, cause cost of alloy is high, molten steel temperature drop is big to ask
A kind of topic, it is desirable to provide ferrochrome Adding Way for capableing of reasonable control process temperature.
Summary of the invention
In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide one kind being capable of reasonable control process
The ferrochrome Adding Way of temperature.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
Chromium method is matched in a kind of converter of low-carbon steel alloy containing Cr, which is characterized in that in the converter smelting later period, works as bath temperature
When being not higher than 0.05% not less than 1700 DEG C, carbon content, stop oxygen blast, ferrochrome is added, the ferrochrome of addition is high-carbon
Ferrochrome and chromic carbide iron, high carbon ferro-chrome additional amount are 35~60kg/t, and chromic carbide iron additional amount is 35~50kg/t, ferrochrome
It taps after fusing.
Preferably, it after the converter of low-carbon steel alloy containing Cr is added with ferrochrome in chromium method, is not blown in converter
Ferrosilicon or aluminium powder is not added in oxygen, increases bottom blowing.
Preferably, the converter of low-carbon steel alloy containing Cr is with Cr content 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
Aluminium is added into ladle to deoxygenation of liquid steel processing.
Compared with prior art, the present invention at least has the following beneficial effects:
1. the present invention reduces the use cost of ferrochrome by reasonably combined high carbon ferro-chrome and chromic carbide iron；It increases
Bottom blowing, by alloy melting, utilizes the silicon member in the high oxidative oxide alloy of molten bath and clinker under the collective effect in high temperature molten bath
Element compensates temperature drop, and carbon content of molten steel meets the decarburization capacity of subsequent vacuum refining after alloy melting, and refining is not excessively increased for technique
Difficulty, so that converter-refining-continuous casting more matches on rhythm of production；
2. after ferrochrome is added, being operated in converter without oxygen blast, improving the recovery rate of alloy Cr element, and economization
The operation of Cr element in ferrosilicon or aluminum reduction slag is added into furnace, so that Converter production period saves height while shortening
The smelting cost of chromium steel；
3. stopping oxygen blast in converter high temperature low-carbon is added ferrochrome, avoid that the tapping of converter high temperature generates is excessive
Thermal loss increases the additional amount of alloy, improves the Cr content of converter smelting endpoint molten steel.
Specific embodiment
Below with 180 tons of converters, the production instance of smelting low carbon steel alloy containing Cr, the invention will be further described.
Embodiment 1
The oxygen blast in converter of deep dephosphorization molten iron, which is smelted, carries out decarburization heating, and in molten bath, the temperature of molten steel is 1740 DEG C, carbon contains
When amount is 0.028%, stop oxygen blast, the ferrochrome that preheating temperature is 400 DEG C is added, wherein high carbon ferro-chrome 10.2t, micro- carbon
Ferrochrome 6.4t.After ferrochrome is added, ferrosilicon or aluminium powder is not added in not oxygen blast in converter, increases bottom blowing.Terminal tapping temperature is
1620 DEG C, aluminium 100kg is added in tapping process to deoxygenation of liquid steel processing, molten steel Cr into ladle for carbon content of molten steel 0.40%
Content is 5.26%.
Embodiment 2
The oxygen blast in converter of deep dephosphorization molten iron, which is smelted, carries out decarburization heating, and in molten bath, the temperature of molten steel is 1710 DEG C, carbon contains
When amount is 0.046%, stop oxygen blast, the ferrochrome that preheating temperature is 400 DEG C is added, wherein high carbon ferro-chrome 6.5t, micro- carbon chromium
Iron 8.9t.After ferrochrome is added, ferrosilicon or aluminium powder is not added in not oxygen blast in converter, increases bottom blowing.Terminal tapping temperature is
1590 DEG C, aluminium 120kg is added in tapping process to deoxygenation of liquid steel processing, molten steel Cr into ladle for carbon content of molten steel 0.25%
Content is 5.02%.
It although the embodiments of the present invention have been disclosed as above, but for those skilled in the art, can be easily real
Now other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is not limited to
Specific details.
Claims (3)
1. chromium method is matched in a kind of converter of low-carbon steel alloy containing Cr, which is characterized in that in the converter smelting later period, when bath temperature not
When being not higher than 0.05% lower than 1700 DEG C, carbon content, stop oxygen blast, ferrochrome is added, the ferrochrome of addition is high carbon chromium
Iron and chromic carbide iron, high carbon ferro-chrome additional amount are 35~60kg/t, and chromic carbide iron additional amount is 35~50kg/t, and ferrochrome is molten
Cr content is 5.0~5.3% in molten steel after change, and carbon content of molten steel is 0.25%~0.40%, is then tapped.
2. chromium method is matched in the converter of low-carbon steel alloy containing Cr according to claim 1, it is characterised in that: the ferrochrome closes
After gold is added, ferrosilicon or aluminium powder is not added in not oxygen blast in converter, increases bottom blowing.
3. chromium method is matched in the converter of low-carbon steel alloy containing Cr according to claim 1, it is characterised in that: terminal tapping temperature
It is 1590~1620 DEG C, aluminium is added in tapping process into ladle to deoxygenation of liquid steel processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051044.2A CN106755709B (en) | 2016-11-25 | 2016-11-25 | Method for preparing chromium from low-carbon Cr-containing alloy steel by converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051044.2A CN106755709B (en) | 2016-11-25 | 2016-11-25 | Method for preparing chromium from low-carbon Cr-containing alloy steel by converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106755709A CN106755709A (en) | 2017-05-31 |
| CN106755709B true CN106755709B (en) | 2019-02-01 |
Family
ID=58910678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611051044.2A Active CN106755709B (en) | 2016-11-25 | 2016-11-25 | Method for preparing chromium from low-carbon Cr-containing alloy steel by converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106755709B (en) |
Families Citing this family (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 |
| 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 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101760581A (en) * | 2009-12-30 | 2010-06-30 | 首钢总公司 | Production process for smelting high-level low-carbon steel at low cost |
| 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 |
-
2016
- 2016-11-25 CN CN201611051044.2A patent/CN106755709B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101760581A (en) * | 2009-12-30 | 2010-06-30 | 首钢总公司 | Production process for smelting high-level low-carbon steel at low cost |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106755709A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103525972B (en) | Converter vanadium-extracting method of molten iron containing vanadium | |
| CN102965584B (en) | High-nitrogen high-manganese stainless steel and smelting method thereof | |
| CN102787196B (en) | Method for smelting stainless steel by direct reduced iron | |
| CN106755709B (en) | Method for preparing chromium from low-carbon Cr-containing alloy steel by converter | |
| CN105671248A (en) | Smelting method of converter efficient dephosphorization | |
| CN102226246A (en) | Smelting method of stainless steel mother liquor | |
| CN111635978A (en) | Method for reducing end point carbon and oxygen deposit of electric furnace | |
| CN103642971A (en) | Method for improving steelmaking end-point carbon content of semisteel and semisteel steelmaking method | |
| CN103866077A (en) | Semi-steel steelmaking double remaining slag steelmaking method | |
| CN102277470B (en) | Method for smelting low-silicon cold heading steel | |
| CN101956044B (en) | Refining method for improving clean class of steel | |
| CN103014230A (en) | Method for producing low-phosphorus high-carbon steel by duplex hot-adding slag washing for electric furnace | |
| CN103388099B (en) | A kind of method of dephosphorization molten iron smelting austenitic stainless steel | |
| CN103642966B (en) | Method for improving high-carbon high-manganese steel converter smelting endpoint carbon content and steelmaking method | |
| CN103627851B (en) | Semisteel steelmaking temperature control method and semisteel steelmaking method | |
| CN111020105A (en) | Utilization method of vanadium-containing iron block | |
| CN107502704B (en) | Method for reducing alumina inclusions in semisteel steelmaking casting blank | |
| CN105296703B (en) | Method for smelting phosphorus-containing steel by top-bottom combined blown converter | |
| CN103409595A (en) | Dephosphorization and steel-making method of vanadium-containing molten iron | |
| CN104109727A (en) | Method for smelting low-phosphorous steel by using semisteel through converter | |
| CN109554515B (en) | Method for smelting stainless steel by top-blown converter | |
| CN101948979B (en) | Method for producing industrial pure iron | |
| CN109750137A (en) | A kind of direct heat of high carbon chromium molten iron converts the manufacturing method of production stainless steel | |
| CN105463156B (en) | A kind of method of intermediate frequency furnace smelting ultralow-carbon stainless steel | |
| CN106544468B (en) | Production method of low-carbon high-manganese steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |