CN105483312A - Method for reserving slag without reduction for stainless steel - Google Patents
Method for reserving slag without reduction for stainless steel Download PDFInfo
- Publication number
- CN105483312A CN105483312A CN201610025868.6A CN201610025868A CN105483312A CN 105483312 A CN105483312 A CN 105483312A CN 201610025868 A CN201610025868 A CN 201610025868A CN 105483312 A CN105483312 A CN 105483312A
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- CN
- China
- Prior art keywords
- steel
- slag
- converter
- stainless steel
- iron
- 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.)
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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
- C21C5/30—Regulating or controlling the blowing
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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
- C21C5/005—Manufacture of stainless steel
-
- 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
-
- 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
-
- 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)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to the field of stainless steel smelting, in particular to a method for reserving slag without reduction for stainless steel. The method for reserving slag without redction for stainless steel includes the steps that firstly, dephosphorization, desulfuration and desilicication are conducted on molten iron; secondly, the molten iron treated in the first step is put into a converter, high-carbon soldering iron is added, oxygen blowing begins, when the temperature is larger than or equal to 1640 DEG C, calcium oxide, magnesium oxide and silicon iron are added for adjusting the components of the molten iron, meanwhile, the components of the molten iron are detected, when set components are reached, steel tapping is conducted but slag discharging is not conducted, then the molten steel treated in the first step is continuously put into the converter, and after the operation is repeated 2-4 times and after the set components are reached finally, steel tapping and slag discharging are conducted; thirdly, tapped steel in the second step is put into a VOD furnace to be refined; and fourthly, the steel refined in the third step is subjected to continuous casting.
Description
Technical field
The present invention relates to stainless steel smelting field, specifically a kind of stainless steel does not reduce the method staying slag.
Background technology
Existing three-step approach stainless steel-making process is undertaken by following route:
Three deferrization water → converter → VOD operation → continuous castings
After converter smelting terminates, enter carbon content (content in the present invention do not illustrate in addition all the refer to mass percentage content) general control of VOD 0.40 ~ 0.50%
According to C+ [O]=CO
3Cr(s)+4[O]=Cr
3O
4
1) in decarburization link, converter carries out decarburization under adopting air, and decarburization under VOD employing vacuum;
2) converter decarburization is requirement molten iron carbon content being reduced to VOD, and VOD is carbon content converter be supplied to is reduced to finished product requirement.
3) reduction period is the same, uses reduction by ferrosilicon.
4) whole part of accurate adjustment, converter is that composition is fine-tuning to VOD requirement, and composition is fine-tuning to finished product requirement by VOD.
5) carry out secondary refining to VOD after converter tapping, carry out finished product to continuous casting after VOD goes to war.
Analyze from above-mentioned smelting process, need oxidation, reduction during converter smelting, the molten steel being supplied to VOD is oxidized again by VOD stove again, again reduces, and the reduction of the reduction in such converter on some steel grades belongs to repeating step.
Stainless steel smelting ultimate principle: in stainless steel smelting process, chromium and carbon can participate in oxidizing reaction in molten bath, and the chromium in furnace charge can be oxidized in a large number at low temperatures and enter in slag, but at high temperature again can by [C] in molten steel reduce and enter in molten steel.This characteristic utilizing Cr and C to be oxidized, adopts and reasonably operates, just can reach the object of " decarbonization and protecting chromium ".Main chemical reactions expression formula in smelting stainless steel process is:
C+[O]=CO
3Cr(s)+4[O]=Cr
3O
4（s）
Cr
3O
4（s）+4[C]=3[Cr]+4CO
Cr
3O
4（s）+2[Si]=3[Cr]+2SiO
2
(SiO
2)+(CaO)=(2CaO·SiO
2)
From above-mentioned stainless steel smelting principle, at converter and VOD operation link, all use the mode of oxidation, reduction, reduction is that the chromic oxide reduction in order to be oxidized to by chromium metal is returned, general employing ferrosilicon carries out reduction-oxidation chromium, needs to meet basicity because ferrosilicon adds with addition of lime simultaneously.
So especially, need to add a large amount of lime in converter steelmaking process, for balancing basicity during reduction use ferrosilicon.Because the consumption of lime increases, the quantity of slag increases too, and oxygen utilization rate will reduce thereupon, and due to the reduction of oxygen utilization rate, chromic oxide increases, and causes the increase of reduction ferrosilicon, and the increase lime consumption of reduction ferrosilicon just increases, uneconomical on cost.Simultaneously because the increase of reduction ferrosilicon, cause the resistance to material life-span along with reduction.According to available data statistics, the quantity of slag increases by 1%, and chromium recovery rate of iron reduces by 0.004%, and reduction ferrosilicon increases 1Kg/t, resistance to material service life reduction 5%.
Summary of the invention
Technical problem to be solved by this invention is: the above-mentioned deficiency how overcoming the stainless method of existing converter smelting, decreases the usage quantity of silicon, lime, improves the utilization ratio of chromium metal.
The technical solution adopted in the present invention is: a kind of stainless steel does not reduce the method staying slag, carries out according to following step:
Step one, molten iron is carried out dephosphorization, desulfurization, desiliconization;
Step 2, the molten steel processed through step one is put into converter, add high-carbon Lip river iron, start oxygen blast, when temperature is more than or equal to 1640 DEG C, adds calcium oxide, magnesium oxide, ferrosilicon adjustment molten steel composition, detect molten steel composition simultaneously, tap after reaching setting composition but do not slag tap, then converter put into by the molten steel continued processing through step one, after repeating 2-4 time, taps and slag tap after reaching setting composition for the last time;
Step 3, the refining of VOD stove is put in the tapping of step 2;
Step 4, the steel through step 3 refining is carried out continuous casting.
The invention has the beneficial effects as follows: the present invention uses and adds molten iron, adds alloy, remaining slag operation mode, reduces stainless smelting cost.
Embodiment
The present embodiment is to produce a kind of Martensite Stainless Steel (according to mass percent, C≤0.05%, 0.30%≤Si≤0.60%, Mn≤0.50%, P≤0.035%, S≤0.008%, 13.0%≤Cr≤13.5%, Ni≤0.20%, 0.08≤Cu≤0.1, all the other are iron and inseparable impurity) be described in detail for example
Step one, molten iron is carried out dephosphorization, desulfurization, desiliconization; Adopt existing ordinary method to carry out dephosphorization, desulfurization, desiliconization to molten iron, according to mass percent, make phosphorus content in molten iron be less than or equal to 0.4%, make sulphur content in molten iron be less than or equal to 0.07%, make silicon content in molten iron be less than or equal to 0.8%.
Step 2, step 2, the molten steel processed through step one is put into converter, add high-carbon Lip river iron, start oxygen blast, when temperature is more than or equal to 1640 DEG C, add calcium oxide, magnesium oxide, ferrosilicon adjustment molten steel composition, detect molten steel composition simultaneously, reach setting composition (according to mass percent, C≤0.2%, Si≤0.80%, Mn≤0.60%, P≤0.1%, S≤0.01%, Cr >=14%, Ni≤0.50%, Cu≤0.15, all the other are iron and inseparable impurity) tap afterwards but do not slag tap, then converter put into by the molten steel continued processing through step one, after repeating 3 times, reach setting composition for the last time (according to mass percent, C≤0.2%, Si≤0.80%, Mn≤0.60%, P≤0.1%, S≤0.01%, Cr >=14%, Ni≤0.50%, Cu≤0.15, all the other are iron and inseparable impurity) tap afterwards and slag tap.
Step 3, the refining of VOD stove is put in the tapping of step 2; Stir under Argon, and add alloy adjustment composition, wait molten steel composition to meet according to mass percent, C≤0.05%, 0.30%≤Si≤0.60%, Mn≤0.50%, P≤0.035%, S≤0.008%, 13.0%≤Cr≤13.5%, Ni≤0.20%, 0.08≤Cu≤0.1, all the other are iron and inseparable impurity, tapping.
Step 4, the steel through step 3 refining is carried out continuous casting.Continuous casting superheating temperature control 20-30 DEG C, tundish temperature 1525-1550 DEG C, large bag temperature 1580-1610 DEG C, casting speed control is at 0.70-1.2m/min, and after molten steel arrives at a station, middle bag blowing argon gas, removes bag inner air.
The present invention utilizes decarburization oxidation period directly to smelt molten steel composition to the demand meeting VOD stove, cancels restoring operation link, adopts next stove to concentrate reduction, reduces smelting process and uses ferrosilicon consumption and lime consumption, shorten the heat.
Claims (1)
1. stainless steel does not reduce the method staying slag, it is characterized in that carrying out according to following step:
Step one, molten iron is carried out dephosphorization, desulfurization, desiliconization;
Step 2, the molten steel processed through step one is put into converter, add high-carbon Lip river iron, start oxygen blast, when temperature is more than or equal to 1640 DEG C, adds calcium oxide, magnesium oxide, ferrosilicon adjustment molten steel composition, detect molten steel composition simultaneously, tap after reaching setting composition but do not slag tap, then converter put into by the molten steel continued processing through step one, after repeating 2-4 time, taps and slag tap after reaching setting composition for the last time;
Step 3, the refining of VOD stove is put in the tapping of step 2;
Step 4, the steel through step 3 refining is carried out continuous casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610025868.6A CN105483312B (en) | 2016-01-15 | 2016-01-15 | A kind of stainless steel does not reduce the method for staying slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610025868.6A CN105483312B (en) | 2016-01-15 | 2016-01-15 | A kind of stainless steel does not reduce the method for staying slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105483312A true CN105483312A (en) | 2016-04-13 |
| CN105483312B CN105483312B (en) | 2017-12-01 |
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|---|---|---|---|
| CN201610025868.6A Active CN105483312B (en) | 2016-01-15 | 2016-01-15 | A kind of stainless steel does not reduce the method for staying slag |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110819880A (en) * | 2019-11-27 | 2020-02-21 | 宝钢德盛不锈钢有限公司 | Pretreatment process and application of chromium-containing low-nickel molten iron for production of 200-series stainless steel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08143927A (en) * | 1994-11-18 | 1996-06-04 | Nippon Steel Corp | Method for refining stainless steel |
| JPH08253805A (en) * | 1995-01-19 | 1996-10-01 | Nippon Steel Corp | Method for refining stainless steel using decarburizing slag having high productivity |
| 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 |
| CN1954086A (en) * | 2004-05-18 | 2007-04-25 | 霍尔辛姆有限公司 | Method for reducing cr in metallurgical slags containing cr |
-
2016
- 2016-01-15 CN CN201610025868.6A patent/CN105483312B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08143927A (en) * | 1994-11-18 | 1996-06-04 | Nippon Steel Corp | Method for refining stainless steel |
| JPH08253805A (en) * | 1995-01-19 | 1996-10-01 | Nippon Steel Corp | Method for refining stainless steel using decarburizing slag having high productivity |
| CN1954086A (en) * | 2004-05-18 | 2007-04-25 | 霍尔辛姆有限公司 | Method for reducing cr in metallurgical slags containing cr |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110819880A (en) * | 2019-11-27 | 2020-02-21 | 宝钢德盛不锈钢有限公司 | Pretreatment process and application of chromium-containing low-nickel molten iron for production of 200-series stainless steel |
| CN110819880B (en) * | 2019-11-27 | 2021-06-22 | 宝钢德盛不锈钢有限公司 | Pretreatment process and application of chromium-containing low-nickel molten iron for production of 200-series stainless steel |
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| Publication number | Publication date |
|---|---|
| CN105483312B (en) | 2017-12-01 |
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