CN108330240A - Method of the aluminium without calcification processing drops in continuous casting Q235 steel grades - Google Patents
Method of the aluminium without calcification processing drops in continuous casting Q235 steel grades Download PDFInfo
- Publication number
- CN108330240A CN108330240A CN201711008991.8A CN201711008991A CN108330240A CN 108330240 A CN108330240 A CN 108330240A CN 201711008991 A CN201711008991 A CN 201711008991A CN 108330240 A CN108330240 A CN 108330240A
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- China
- Prior art keywords
- converter
- tapping
- steel
- ladle
- aluminium
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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
-
- 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
- C21C7/06—Deoxidising, e.g. killing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of continuous casting Q235 steel grades to drop method of the aluminium without calcification processing, (1) converter operation：It is required that in desulfurized molten iron [S]≤0.020%, steel scrap is 15 25 tons/stove with dosage；(2) the total charge weight of converter：140 ± 10 tons, smelting molten steel basicity controls R=2.8 4.0；(3) bottom-blowing of converter gas is nitrogen, it is desirable that converter tapping terminal carbon range 0.08 0.012%；(4) temperature controls；(5) tapping time >=3 ' 30 "；(6) deoxidation：Sequentially add low aluminium slag ball, ferro-aluminum, ferromanganese, ladle lime；(7) tapping blowing argon gas；(8) requirement of the converter to ladle.The present invention reduces the production cost of Calcium treatment by process optimization in the case where ensureing continuous irrigatation castability and product quality, and identical castability and purity requirements are reached compared with LF techniques, improves conticaster and even pours success rate, improves operating rate.
Description
Technical field
The invention belongs to steelmaking technical fields, especially a kind of side of continuous casting Q235 steel grades drop aluminium without calcification processing
Method.
Background technology
Production Q235 steel grades and SPHC at present（Low-carbon low-silicon steel）Use LF refining technique, process route excellent when steel series
Turn to top and bottom combined blown converter → LF refining furnace → CCM slab casters.Q235 steel grades and SPHC later（Low-carbon low-silicon steel）Series
Steel grade is optimized for LD top and bottom combined blown converters → Argon by production process route（Calcium treatment）→ CCM slab casters, take
Disappear and handled through LF refining furnace, has been used till today always.Ladle argon-blown after tapping deoxidization（Calcium treatment）It is straight upper to continuous casting, it finds
Big Baogang water-coating port dross is not caught up with is up to 28% with the ratio of continuous casting intermediate inlet storage stream dross, in order to ensure to pour into a mould direct motion
It is forced using strong deoxidation of tapping, with 0.02-0.03% is added to, the technique for then carrying out Calcium treatment is produced molten steel Al.Calcium treatment
The Ca controls of technological requirement molten steel are in 0.002-0.004%, to high-melting-point Al2O3Denaturation treatment is carried out, 7Al is formed2O3- 12CaO is low
Fusing point complex inclusion.The treatment process causes production cost to increase.The control of Al2O3 refractory oxides is unstable by analysis
It is fixed, add the control range of sundries narrower high-melting-point by Calcium treatment, it is difficult to generate ideal 7Al completely2O3-12CaO。
Invention content
The purpose of the present invention is to provide a kind of continuous casting Q235 steel grades to drop method of the aluminium without calcification processing, and the present invention is logical
Process optimization is crossed, in the case where ensureing continuous irrigatation castability and product quality, the production cost of Calcium treatment is reduced, with LF technique phases
Than reaching identical castability and purity requirements, improves conticaster and even pour success rate, reduce production cost, improve operating rate.
The object of the present invention is achieved like this：A kind of continuous casting Q235 steel grades drop method of the aluminium without calcification processing,
(1) converter operates：The molten iron in converter is added, it is desirable that in desulfurized molten iron [S]≤0.020%, and carry out processing of skimming；
With addition of steel scrap use ordinary scrap steel, steel scrap with dosage be 15-25 tons/stove；
(2) the total charge weight of converter：140 ± 10 tons, smelting molten steel basicity controls R=2.8-4.0；
(3) bottom-blowing of converter gas is nitrogen, it is desirable that converter tapping terminal carbon range 0.08-0.012%；
(4) temperature controls：1660 °C ± 8 °C of tapping temperature, 1605 °C ± 8 °C of ladle temperature；
(5) tapping time >=3 ' 30 ", slag-stopping tapping forbids slag；
(6) deoxidation：Sequentially add low aluminium slag ball 200kg/ stoves, ferro-aluminum 0.7kg/t, ferromanganese 1.5kg/t, ladle lime 300kg/
Stove, is added opportunity, and tapping starts to be added during to tapping 1/2-2/3；
(7) the Argon intensity of tapping blowing argon gas is 20-40m3/h；
(8) requirement of the converter to ladle [Si], [Al]：[Si] 0.15-0.20%, [Al] 0.003-0.010%, deoxidation depth are final
With molten steel 20<[0]<Subject to 30ppm.
Invent the advantageous effect generated：
The application of ladle top slag modification technology and market competition are growing more intense, and by process optimization, further decrease production cost
As the top priority of each steel-making enterprise, ensureing continuous irrigatation castability and product quality, by Q235 steel grades and SPHC（It is low
Carbon low-silicon steel）Molten steel Calcium treatment removes after Argon in steel series production technology, reduces the production cost of Calcium treatment, Q235 steel grades
And SPHC（Low-carbon low-silicon steel）Steel series production process route, which advanced optimizes, to be reached for LD-- Argons -- CCM compared to LF techniques
To identical castability and purity requirements.
The scope of application and application prospect of invention：
This method is suitable for same type conticaster, can improve the method that conticaster even pours success rate, is ensureing continuous irrigatation castability
In the case of product quality, cost is reduced, improves operating rate.
The present invention reduces Calcium treatment by process optimization in the case where ensureing continuous irrigatation castability and product quality
Production cost reaches identical castability and purity requirements compared with LF techniques, improves conticaster and even pours success rate, reduces
Production cost, improves operating rate.
Specific implementation mode
The technical solution further illustrated the present invention below by specific implementation mode
A kind of continuous casting Q235 steel grades drop method of the aluminium without calcification processing includes the following steps：
1 pretreatment and feed operation main points：
1.1 desulphation mode optimized scopes：It is required that in desulfurized molten iron [S]≤0.020%, and carry out processing of skimming；
It is 15-25t/ stoves with dosage that 1.2 steel scraps, which use ordinary scrap steel, steel scrap,；
2 converter key points for operation：
2.1 total charge weights: 140±5t；
2.2 basicity control：R=3.2-3.6；
2.3 bottom blown gas select：Nitrogen；It is required that converter tapping terminal carbon range：0.010%；
2.4 temperature control：
Note：1. tapping temperature (1660 DEG C), 1610 DEG C of ladle packet temperature；
2.5 tapping times： 4′00″-5′30″；Slag-stopping tapping forbids slag；
2.6 deoxidation alloying：
2.6.1 material prepares
1）The low aluminium slag balls of SD；2）Pre-deoxidant（Molten-steel deoxidation agent）Converter manganeisen；4）Ladle lime；
2.6.2 alloy addition sequence：
2.7 converters carry out particular/special requirement to ladle [Si], [Al]：[Si]：0.15~0.20%、[Al]:0.003~0.010%（Al at
It point only makes reference, deoxidation depth requirements are finally subject to molten steel 20 ＜ [O] ＜ 30ppm.
Claims (1)
1. method of the aluminium without calcification processing drops in a kind of continuous casting Q235 steel grades, it is characterized in that：
(1) converter operates：The molten iron in converter is added, it is desirable that in desulfurized molten iron [S]≤0.020%, and carry out processing of skimming；
With addition of steel scrap use ordinary scrap steel, steel scrap with dosage be 15-25 tons/stove；
(2) the total charge weight of converter：140 ± 10 tons, smelting molten steel basicity controls R=2.8-4.0；
(3) bottom-blowing of converter gas is nitrogen, it is desirable that converter tapping terminal carbon range 0.08-0.012%；
(4) temperature controls：1660 °C ± 8 °C of tapping temperature, 1605 °C ± 8 °C of ladle temperature；
(5) tapping time >=3 ' 30 ", slag-stopping tapping forbids slag；
(6) deoxidation：Sequentially add low aluminium slag ball 200kg/ stoves, ferro-aluminum 0.7kg/t, ferromanganese 1.5kg/t, ladle lime 300kg/
Stove, is added opportunity, and tapping starts to be added during to tapping 1/2-2/3；
(7) the Argon intensity of tapping blowing argon gas is 20-40m3/h；
(8) requirement of the converter to ladle [Si], [Al]：[Si] 0.15-0.20%, [Al] 0.003-0.010%, deoxidation depth are final
With molten steel 20<[0]<Subject to 30ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711008991.8A CN108330240A (en) | 2017-10-25 | 2017-10-25 | Method of the aluminium without calcification processing drops in continuous casting Q235 steel grades |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711008991.8A CN108330240A (en) | 2017-10-25 | 2017-10-25 | Method of the aluminium without calcification processing drops in continuous casting Q235 steel grades |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108330240A true CN108330240A (en) | 2018-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711008991.8A Pending CN108330240A (en) | 2017-10-25 | 2017-10-25 | Method of the aluminium without calcification processing drops in continuous casting Q235 steel grades |
Country Status (1)
| Country | Link |
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| CN (1) | CN108330240A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111549196A (en) * | 2019-02-10 | 2020-08-18 | 新疆八一钢铁股份有限公司 | Steelmaking operation method for replacing coolant with scrap steel broken material |
| CN112267000A (en) * | 2020-10-20 | 2021-01-26 | 新疆八一钢铁股份有限公司 | Short-flow process for producing low-carbon low-silicon aluminum killed steel |
| CN114854935A (en) * | 2022-05-18 | 2022-08-05 | 宝武集团鄂城钢铁有限公司 | Deoxidation smelting method for slab Q235 steel and slab Q235 steel |
| CN115652032A (en) * | 2022-11-14 | 2023-01-31 | 鞍钢股份有限公司 | Deoxidizing agent suitable for direct application of SPHC steel grade and deoxidizing alloying method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041444A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Low-carbon low-silicon high-quality carbon structural steel and production method thereof |
-
2017
- 2017-10-25 CN CN201711008991.8A patent/CN108330240A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041444A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Low-carbon low-silicon high-quality carbon structural steel and production method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111549196A (en) * | 2019-02-10 | 2020-08-18 | 新疆八一钢铁股份有限公司 | Steelmaking operation method for replacing coolant with scrap steel broken material |
| CN112267000A (en) * | 2020-10-20 | 2021-01-26 | 新疆八一钢铁股份有限公司 | Short-flow process for producing low-carbon low-silicon aluminum killed steel |
| CN114854935A (en) * | 2022-05-18 | 2022-08-05 | 宝武集团鄂城钢铁有限公司 | Deoxidation smelting method for slab Q235 steel and slab Q235 steel |
| CN115652032A (en) * | 2022-11-14 | 2023-01-31 | 鞍钢股份有限公司 | Deoxidizing agent suitable for direct application of SPHC steel grade and deoxidizing alloying method |
| CN115652032B (en) * | 2022-11-14 | 2023-09-26 | 鞍钢股份有限公司 | Deoxidizer suitable for SPHC steel grade direct up and deoxidizing alloying method |
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Application publication date: 20180727 |
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