CN102433413A - Method for producing low-oxygen steel by converter - Google Patents
Method for producing low-oxygen steel by converter Download PDFInfo
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- CN102433413A CN102433413A CN2011104402931A CN201110440293A CN102433413A CN 102433413 A CN102433413 A CN 102433413A CN 2011104402931 A CN2011104402931 A CN 2011104402931A CN 201110440293 A CN201110440293 A CN 201110440293A CN 102433413 A CN102433413 A CN 102433413A
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Abstract
The invention relates to a method for producing low-oxygen steel by a converter, which is characterized by comprising the following technical processes of: tapping when C content of endpoint molten steel in the converter is controlled to be no less than 0.06at%; controlling the target Al content in the LF (ladle furnace) smelting process to ensure the Al content in LF off-position steel to be 0.015-0.040at%; controlling the weight ratio of basicity of slags (namely CaO and SiO2) to be 2.8-4.5, and the content of FeO and MnO in the slags to be no more than 1wt%; and controlling the soft argon blowing time to be no less than 15 minutes and the soft argon blowing flow to be more than 30Nl/min after VD (vacuum degasser) vacuum treatment. The method for producing low-oxygen steel by the converter has the advantages that: the lower limit of the endpoint C content in the converter is lower, thus having high adaption to molten steel with different qualities; a Al-Mn-Fe strong deoxygenation mode is adopted for tapping of the converter, Ca treatment is avoided after VD vacuum treatment, water tap plugging is prevented in the continuous casting process, and the whole-oxygen mass content in the steel can be stably controlled to be no more than 12*10<-6>.
Description
Technical field:
The present invention relates to a kind of converter and produce the method for low-oxygen steel, particularly a kind of method of under molten iron pre-desulfurization-top and bottom combined blown converter-LF refining-VD vacuum-treat-continuous casting process condition, producing low-oxygen steel belongs to the field of steel-making that metallurgical industry is produced.
Background technology:
Development and exploitation along with projects such as ferrous materials of new generation, super-steel, ultra-fine grain steels further promote ferrous materials and develop towards more high performance direction.The development trend of high-grade special steel kind be more high-performance, more low-cost, more be prone to processing, long lifetime more.Bearing steel entire oxygen content in the steel content and inclusion are had stricter requirement, so various countries generally is controlled at lower level with the bearing steel total oxygen content as the representative kind of these high-grade Clean Steels.
In " special steel " that publish in November, 2005 " 100 t converter-LF (VD) technologies are smelted the Control for Oxygen Content of bearing steel ", the converter terminal carbon content of molten steel is 0.2%～0.6%, and the quantity of slag is less than the 5kg/t steel under the control converter.In " special steel " that publish in May, 2006 " 60t converter-60tLF smelts GCr15 bearing steel control of Oxygen Content ", the converter terminal carbon content is controlled between the 0.15%-0.45%, and average 0.30%.The tapping pushing off the slag changes the multiaspect slag pushing off body into by original employing slag-blocking ball, and before tapping, adds slag retaining cap at tap hole, slag under the control converter tapping process.
In the above-mentioned background technology, carbon content is all higher in the converter terminal steel, and it is better that pushing off the slag is also controlled.And actual in producing the low-oxygen steel process, because it is bad to go into stove molten iron condition, phosphorus in, the molten iron low like molten iron temperature, sulphur content are high, make the requirement that carbon content does not reach high value in the converter terminal steel, generally all are lower than 0.15at%; In the converter tapping process, because pneumatic pushing off the slag equipment failure, often keep off bad or can't stop slag.
Summary of the invention
The object of the invention provides a kind of under molten iron pre-desulfurization-top and bottom combined blown converter-LF refining-VD vacuum-treat-continuous casting process condition, through the smelting process technology controlling and process, and the method that low-oxygen steel is produced in the converter that makes entire oxygen content in the steel content reach lower level.
The process step that technical scheme of the present invention realizes is following:
(1) taps during [C] >=0.06at% in the control converter terminal molten steel;
(2) LF refining controlling target aluminium content, LF is offed normal, and aluminium content is controlled between the 0.015-0.040at% in the steel;
(3) control basicity of slag CaO/SiO
2Weight ratio is (FeO+MnO)≤1wt% between 2.8-4.5, in the slag;
(4) the VD soft blow argon time is controlled at >=15min, and soft blow argon flow is greater than 30Nl/min.
Particularly: the mass percent of [C]>=0.06% o'clock tapping in the converter terminal molten steel; Add aluminum-manganese-iron alloy during the converter tapping alloying in order earlier, add ferrosilicon and ferromanganese again and carry out Alloying Treatment, that deoxidation products at first forms like this is Al
2O
3, to be convenient to from molten steel, float fast, the aluminum-manganese-iron alloy add-on is that control LF is in place to the amount of aluminium content between 0.06at%-0.10at% in the steel behind the electrochemical slag; Ladle get into the LF stove in place after, in stove, add lime, fluorite, bauxitic clay, calcium carbide slag making, make the LF basicity of slag CaO/SiO that offs normal
2Weight ratio is controlled between the 2.8-4.5, (FeO+MnO)≤1wt% in the slag; Aluminium content in the adjustment steel; Make the LF stove off normal in the steel aluminium content between 0.015at%-0.040at%; Can prevent so promptly in the steel that aluminium content crosses low and cause the deoxidation deficiency that oxygen content in steel is raise, can prevent aluminium too high levels in the steel again and cause [Al] (SiO
2) reduction, oxygen content in steel is raise; Soft blow argon time>=15min behind the control VD vacuum breaker; Soft blow argon flow is greater than 30Nl/min; Be that the flow control of soft blow argon can stirred molten steel; And the molten steel face does not expose in air is advisable, and does not feed aluminum steel in the VD vacuum or adds aluminum-manganese-iron alloy, and VD does not feed calcium line after finishing in steel.
The invention has the beneficial effects as follows: converter terminal carbon content lower value is lower, and is stronger to the molten iron flexibility of different mass; Converter tapping adopts the strong deoxidation of aluminium ferromanganese, does not carry out calcium behind the VD and handles, and in casting process, also the water blocking mouthh phenomenon can not take place, can the entire oxygen content in the steel mass content be stablized to be controlled at≤12 * 10
-6Scope in.
Embodiment
Under molten iron pre-desulfurization-top and bottom combined blown converter-LF refining-VD vacuum-treat-continuous casting process condition, when producing the GCr15 bearing steel,, taked following embodiment to the control of oxygen content in steel:
(1) when the converter terminal liquid steel temperature at 1630 ℃-1660 ℃, in the molten steel mass percent of [C] reach >=the 0.06at% condition can tap; During converter tapping 1/3; Along with flowing to, steel adds aluminum-manganese-iron alloy in the ladle; Add ferrosilicon and manganeseiromization again, the aluminum-manganese-iron alloy add-on is to make that the LF stove is in place gives behind the electrochemical slag that aluminium content adds lime 3kg/t simultaneously in the steel in ladle between 0.06at%-0.10at%;
(2) ladle get into the LF stove in place after, in stove, add 8-9kg/t lime, 1.5-2kg/t fluorite, 1.5-2kg/t bauxitic clay, 1.5-2kg/t calcium carbide and carry out slag making, make the LF basicity of slag CaO/SiO that offs normal
2Weight ratio is (FeO+MnO)≤1wt% between 2.8-4.5, in the slag; Send electrochemical slag to get aluminium content in the steel appearance check steel in the time of 10 minutes, if when being lower than target lower limit 0.06at%, needing in steel, to add aluminium ferromanganese and mend aluminium, add-on is to make the LF stove off normal in the steel aluminium content between 0.015at%-0.040at%;
(3) molten steel gets into the VD stove and vacuumizes processing; Under vacuum tightness≤0.10Kpa condition; Dark vacuum time>=15min carries out the soft blow argon to molten steel behind the VD vacuum breaker, soft blow argon time>=15min; Soft blow argon flow greater than 30Nl/min (can molten steel be stirred, and the molten steel face do not expose in air be advisable).
Through above-mentioned embodiment, can make the low-oxygen steel of producing under molten iron pre-desulfurization-top and bottom combined blown converter-LF refining-VD vacuum-treat-continuous casting process condition (GCr15 bearing steel), the entire oxygen content in the steel mass content is stable to be controlled at≤and 12 * 10
-6Scope.
Claims (3)
1. the method for low-oxygen steel is produced in a converter, and it is characterized in that: the process step of said method is:
(1) taps during [C] >=0.06at% in the control converter terminal molten steel;
(2) LF refining controlling target aluminium content, LF is offed normal, and aluminium content is controlled between the 0.015-0.040at% in the steel;
(3) control basicity of slag CaO/SiO
2Weight ratio is (FeO+MnO)≤1wt% between 2.8-4.5, in the slag;
(4) the VD soft blow argon time is controlled at >=15min, and soft blow argon flow is greater than 30Nl/min.
2. the method for low-oxygen steel is produced in converter according to claim 1, it is characterized in that: add aluminum-manganese-iron alloy during the converter tapping alloying in order earlier, add ferrosilicon and ferromanganese again and carry out Alloying Treatment.
3. the method for low-oxygen steel is produced in converter according to claim 2, it is characterized in that: the aluminum-manganese-iron alloy add-on is that control LF is in place to the amount of aluminium content between 0.06at%-0.10at% in the steel behind the electrochemical slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104402931A CN102433413A (en) | 2011-12-08 | 2011-12-08 | Method for producing low-oxygen steel by converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104402931A CN102433413A (en) | 2011-12-08 | 2011-12-08 | Method for producing low-oxygen steel by converter |
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| CN102433413A true CN102433413A (en) | 2012-05-02 |
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| CN2011104402931A Pending CN102433413A (en) | 2011-12-08 | 2011-12-08 | Method for producing low-oxygen steel by converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103255259A (en) * | 2013-05-08 | 2013-08-21 | 莱芜钢铁集团有限公司 | Method of controlling molten steel pourability under condition of calcium-free treatment |
| CN110541114A (en) * | 2019-10-08 | 2019-12-06 | 武汉钢铁集团鄂城钢铁有限责任公司 | smelting method of high-nitrogen high-sulfur low-aluminum steel |
| CN115747420A (en) * | 2022-11-04 | 2023-03-07 | 北京包钢朗润新材料科技有限公司 | Three-step slag adjusting method suitable for refining high-manganese high-aluminum steel |
-
2011
- 2011-12-08 CN CN2011104402931A patent/CN102433413A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| 刘跃等: "100t转炉-LF（VD）工艺冶炼轴承钢的氧含量控制", 《特殊钢》 * |
| 王文虎等: "60tBOF-LF（VD）-150mm×150mm连铸生产GCr15轴承钢的工艺实践", 《特殊钢》 * |
| 邢梅峦等: "60t转炉-60tLF冶炼GCr15轴承钢氧含量的控制", 《特殊钢》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103255259A (en) * | 2013-05-08 | 2013-08-21 | 莱芜钢铁集团有限公司 | Method of controlling molten steel pourability under condition of calcium-free treatment |
| CN103255259B (en) * | 2013-05-08 | 2014-12-31 | 莱芜钢铁集团有限公司 | Method of controlling molten steel pourability under condition of calcium-free treatment |
| CN110541114A (en) * | 2019-10-08 | 2019-12-06 | 武汉钢铁集团鄂城钢铁有限责任公司 | smelting method of high-nitrogen high-sulfur low-aluminum steel |
| CN110541114B (en) * | 2019-10-08 | 2021-02-23 | 宝武集团鄂城钢铁有限公司 | Smelting method of high-nitrogen high-sulfur low-aluminum steel |
| CN115747420A (en) * | 2022-11-04 | 2023-03-07 | 北京包钢朗润新材料科技有限公司 | Three-step slag adjusting method suitable for refining high-manganese high-aluminum steel |
| CN115747420B (en) * | 2022-11-04 | 2023-12-01 | 北京包钢朗润新材料科技有限公司 | Three-step slag adjusting method suitable for refining high-manganese high-aluminum steel |
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Application publication date: 20120502 |