CN102321782A - Molten steel purifying agent for IF (intermediate frequency) furnace steelmaking and preparation method thereof - Google Patents
Molten steel purifying agent for IF (intermediate frequency) furnace steelmaking and preparation method thereof Download PDFInfo
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- CN102321782A CN102321782A CN201110249708A CN201110249708A CN102321782A CN 102321782 A CN102321782 A CN 102321782A CN 201110249708 A CN201110249708 A CN 201110249708A CN 201110249708 A CN201110249708 A CN 201110249708A CN 102321782 A CN102321782 A CN 102321782A
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- molten steel
- purifying agent
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- intermediate frequency
- additive
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- 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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Abstract
The invention relates to a molten steel purifying agent for IF (intermediate frequency) furnace steelmaking and a preparation method thereof. The molten steel purifying agent is characterized in that: the purifying agent comprises the following components: quicklime, aluminum powder, water and an additive, wherein the quicklime, the aluminum powder and the water are prepared according to the proportion in a chemical reaction formula, and the chemical reaction formula is 2Al +3CaO +9H2O = 3CaO . Al2O3 . 6H2O +3 H2; and the additive is a calcium silicate barium alloy, or a rare earth alloy, or a mixture of the calcium silicate barium alloy and the rare earth alloy and accounts for 0 to 3wt% of the total amount of the purifying agent. The invention has the following advantages that: 1, the precipitation deoxidation of molten steel can be replaced, compared with pure aluminum deoxidation, the oxygen content in steel can be more obviously reduced, and the effect increases by 25-70% in a similar smelting environment; 2, after the purifying agent is added into the molten steel, the desulfurization effect is very obvious, and the sulfur content can be finally reduced to below 0.005%; and 3, after the molten steel purifying agent is used, the inclusion level of the final products A, B, C and D is less than one.
Description
Technical field
The present invention relates to a kind of steel-making of intermediate frequency furnace with agent for purifying molten steel and preparation method thereof, belong in the steel-making of intermediate frequency furnace technology scavenging agent field deoxidation, desulfurization and the removal inclusion of molten steel.
Background technology
Along with all trades and professions are increasingly high to steel and steel casting specification of quality, especially oxygen, sulphur and inclusion content require more and more lower in the steel.The molten steel of intermediate frequency furnace fusing generally adopts bulk deoxidation, and deoxidation products is trapped in that to be difficult to remove and return oxygen in the molten steel very fast.The sulphur content of molten steel depends on raw-material sulphur content, is difficult for desulfurization.After the furnace charge fusing, various inclusiones are difficult to effectively removed in the molten steel, enter into steel ingot or steel casting with molten steel at last.More than three aspects can give the finished product deleterious impact.
Summary of the invention
The objective of the invention is to the existing existing deficiency of steel-making of intermediate frequency furnace technology, the steel-making of intermediate frequency furnace that a kind of deoxidation, desulfurization effect are provided is with agent for purifying molten steel and preparation method thereof.
The objective of the invention is to realize in the following manner:
The raw material of scavenging agent of the present invention consists of unslaked lime, aluminium powder, water and additive, and unslaked lime, aluminium powder and water are pressed the proportioning preparation in the reaction formula, and its reaction formula is:
2Al+3CaO+9H
2O=3CaOAl
2O
36H
2O+3H
2↑, additive is one or both the mixing in calsibar alloy and the rare earth alloy, additive accounts for 0～3wt% of scavenging agent total amount.
Said rare earth alloy is the 1# rare earth alloy.
The preparation method of scavenging agent of the present invention is: the proportioning by chemical reaction adds unslaked lime in the entry, after stirring, adds aluminium powder gradually, and its reaction formula is:
2Al+3CaO+9H
2O=3CaOAl
2O
36H
2O+3H
2↑, after question response finishes, in drying baker, after 1-2 hour, add the additive of 0～3wt% of total amount again to reaction product with 400～500 ℃ of oven dry.
The method of use of scavenging agent of the present invention is: send electrofusion after adding in the intermediate frequency furnace by 1～1.8% of charging weight with furnace charge; Also can after the furnace charge fusing finishes, add in the intermediate frequency furnace again; When under less heating power, being incubated certain hour, the casting of skimming when being warmed up to tapping temperature then after the scavenging agent scorification.In vacuum oven, use, during casting a grade slag system need be set.
Effect of the present invention is: 1, can replace the molten steel bulk deoxidation, compare with the fine aluminium deoxidation, can more significantly reduce the oxygen level in the steel, under similar smelting environment, improve 25-70% than fine aluminium deoxidation effect.2, behind the interior adding of the molten steel scavenging agent, sweetening effectiveness is very obvious, and sulphur content is reduced to below 0.005% the most at last.3, behind the use agent for purifying molten steel, A in the finished product, B, C, the D class is mingled with rank and is not more than 1 grade.
Embodiment
Embodiment 1: melt under similar environment with same starting material and cast flange steel ingot casting, number 1 for adding the 0.06wt% fine aluminium, numbering 2 is that the ingot casting chemical composition analysis result behind the adding 1wt% agent for purifying molten steel sees table 1:
Table 1 flange steel ingot casting chemical ingredients (wt%)
| Numbering | C | Si | Mn | Ni | RE | Cu | Al | P | S | O | N |
| 1 | 0.143 | 0.097 | 1.310 | 0.027 | 0.0286 | 0.007 | 0.047 | 0.0146 | 0.007 | 0.0087 | 0.0047 |
| 2 | 0.163 | 0.154 | 1.328 | 0.022 | 0.0330 | 0.026 | 0.273 | 0.0104 | 0.004 | 0.0046 | 0.0071 |
The good results are evident can to find out deoxidization desulfuration.
Aspect the removal field trash, behind the adding agent for purifying molten steel, can remove field trash bigger in the molten steel, cleanser has played the effect that captures bits, and result of use sees Table 2:
The forging of table 2 flange is made the base metallographic and is mingled with detected result
Embodiment 2: melt under 4Pa vacuum tightness with same starting material and cast flange steel ingot casting, number 01 for adding the 0.06wt% fine aluminium, numbering 02 is the ingot casting chemical composition analysis result behind the adding 1wt% agent for purifying molten steel, sees table 3:
The flange steel ingot casting chemical ingredients (wt%) of smelting under the table 34Pa vacuum tightness
The good results are evident can to find out deoxidization desulfuration.
Aspect the removal field trash, behind the adding agent for purifying molten steel, can remove field trash bigger in the molten steel, cleanser has played the effect that captures bits, and result of use sees Table 4:
The flange forging that table 4 is smelted under 4Pa vacuum tightness is made the base metallographic and is mingled with detected result
Claims (3)
1. a steel-making of intermediate frequency furnace is used agent for purifying molten steel, it is characterized in that: the raw material of scavenging agent consists of unslaked lime, aluminium powder, water and additive, and unslaked lime, aluminium powder and water are pressed the proportioning preparation in the reaction formula, and its reaction formula is: 2Al+3CaO+9H
2O=3CaOAl
2O
36H
2O+3H
2↑, additive is one or both the mixing in calsibar alloy and the rare earth alloy, additive accounts for 0～3wt% of scavenging agent total amount.
2. steel-making of intermediate frequency furnace according to claim 1 is used agent for purifying molten steel, it is characterized in that: rare earth alloy is the 1# rare earth alloy.
3. a steel-making of intermediate frequency furnace according to claim 1 is with the preparation method of agent for purifying molten steel, and it is characterized in that: the proportioning by chemical reaction adds unslaked lime in the entry, after stirring, adds aluminium powder gradually, and its reaction formula is: 2Al+3CaO+9H
2O=3CaOAl
2O
36H
2O+3H
2↑, after question response finishes, in drying baker, after 1-2 hour, add the additive of 0～3wt% of total amount again to reaction product with 400～500 ℃ of oven dry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110249708A CN102321782A (en) | 2011-08-18 | 2011-08-18 | Molten steel purifying agent for IF (intermediate frequency) furnace steelmaking and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110249708A CN102321782A (en) | 2011-08-18 | 2011-08-18 | Molten steel purifying agent for IF (intermediate frequency) furnace steelmaking and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102321782A true CN102321782A (en) | 2012-01-18 |
Family
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| CN201110249708A Pending CN102321782A (en) | 2011-08-18 | 2011-08-18 | Molten steel purifying agent for IF (intermediate frequency) furnace steelmaking and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107523664A (en) * | 2017-08-19 | 2017-12-29 | 江苏标新工业有限公司 | A kind of intermediate frequency furnace desulfurization slag former and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1341755A (en) * | 2001-09-06 | 2002-03-27 | 刘长福 | Production process of silicon calcium barium liquid steel cleaning agent and its equipment |
| CN1762815A (en) * | 2005-09-14 | 2006-04-26 | 郑州登峰熔料有限公司 | Lightweight high-calcium type calcium aluminate production method |
-
2011
- 2011-08-18 CN CN201110249708A patent/CN102321782A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1341755A (en) * | 2001-09-06 | 2002-03-27 | 刘长福 | Production process of silicon calcium barium liquid steel cleaning agent and its equipment |
| CN1762815A (en) * | 2005-09-14 | 2006-04-26 | 郑州登峰熔料有限公司 | Lightweight high-calcium type calcium aluminate production method |
Non-Patent Citations (1)
| Title |
|---|
| 曹锡章 等: "《无机化学（第三版）下册》", 30 September 2002, article "无机化学（第三版）下册", pages: 773 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107523664A (en) * | 2017-08-19 | 2017-12-29 | 江苏标新工业有限公司 | A kind of intermediate frequency furnace desulfurization slag former and preparation method thereof |
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Application publication date: 20120118 |