CN114574657A - Wire feeding process of anti-splashing solid calcium metal cored wire in stainless steel refining - Google Patents
Wire feeding process of anti-splashing solid calcium metal cored wire in stainless steel refining Download PDFInfo
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- CN114574657A CN114574657A CN202210145538.6A CN202210145538A CN114574657A CN 114574657 A CN114574657 A CN 114574657A CN 202210145538 A CN202210145538 A CN 202210145538A CN 114574657 A CN114574657 A CN 114574657A
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- calcium
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 74
- 239000011575 calcium Substances 0.000 title claims abstract description 74
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 36
- 239000002184 metal Substances 0.000 title claims abstract description 36
- 239000007787 solid Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 21
- 239000010935 stainless steel Substances 0.000 title claims abstract description 21
- 238000007670 refining Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 57
- 239000010959 steel Substances 0.000 claims abstract description 57
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052786 argon Inorganic materials 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 238000007664 blowing Methods 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims abstract description 8
- 239000011347 resin Substances 0.000 claims abstract description 8
- 229920005989 resin Polymers 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 230000006698 induction Effects 0.000 abstract 1
- 238000009847 ladle furnace Methods 0.000 description 6
- 238000009835 boiling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 241000646858 Salix arbusculoides Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- ULGYAEQHFNJYML-UHFFFAOYSA-N [AlH3].[Ca] Chemical group [AlH3].[Ca] ULGYAEQHFNJYML-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical group [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000024121 nodulation Effects 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Classifications
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C24/00—Alloys based on an alkali or an alkaline earth metal
-
- 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
Abstract
The invention discloses a wire feeding process of a splash-proof solid calcium metal cored wire in stainless steel refining. The solid calcium metal cored wire comprises 100 percent of Ca more than or equal to 95 percent, Si less than or equal to 0.1 percent, N less than or equal to 0.1 percent, Al less than or equal to 1.0 percent, Mg less than or equal to 0.8 percent and impurities less than or equal to 3 percent; the diameter of the calcium core of the core-spun yarn is 7.5 mm-8.5 mm, the surface of the calcium core is wound with a layer of high-temperature resistant resin fiber paper, and the diameter of the steel strip of the core-spun yarn is 0.8 mm-0.9 mm. The stainless steel LF vacuum induction furnace is fed with the anti-splashing solid calcium metal cored wire by using a high-speed wire feeding machine, the argon flow is adjusted to be medium stirring during wire feeding, and the argon flow is adjusted to be weak stirring after the wire feeding is finished. The invention can obviously reduce the splashing effect of calcium on the surface of molten steel by controlling the feeding speed, the feeding time and the feeding position of the anti-splashing solid calcium metal core-spun yarn and adjusting the argon blowing amount, thereby achieving the effect of purifying the molten steel and having the characteristics of safe and convenient operation and high yield.
Description
Technical Field
The invention relates to a wire feeding process of a splash-proof solid calcium metal cored wire in stainless steel refining, belonging to the technical field of smelting.
Background
In order to improve the purity of molten steel, promote the floating of inclusions and effectively reduce the problem of nozzle nodulation, the calcium treatment technology is widely applied in the refining process of stainless steel at present, and the deoxidation alloying is realized by adding calcium-aluminum core-spun yarns and silicon-calcium core-spun yarns. However, the calcium has low solubility in molten steel, low boiling point, easy gasification, quick reaction and burning loss with molten slag in the molten steel, difficult control in the wire feeding process, easy turnover of the molten steel and unstable calcium yield.
The prior publications mainly relate to a preparation method of a solid calcium metal core-spun yarn, such as: chinese patent 201210005971.6 discloses a seamless solid calcium metal core-spun yarn for steel-making deoxidation and its preparation method, the intermediate layer of the invention is nano-scale silicon powder, and the feeding station is an electric furnace. In the literature, "application analysis of solid pure calcium cored wires in a refining furnace of 150 tLF" (5 th stage in 2013 by a willow steel science and technology), the average yield of calcium is only 18.77%, and the cored wires have a two-layer common structure.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a wire feeding process of the anti-splashing solid calcium metal cored wire in stainless steel refining, so as to reduce splashing of calcium on the surface of molten steel, achieve the effects of purifying the molten steel and improving the calcium yield.
The invention provides a wire feeding process of an anti-splashing solid calcium metal cored wire in stainless steel refining, wherein the solid calcium metal cored wire comprises the following components in structure:
the core-spun yarn comprises 100 percent of Ca more than or equal to 95 percent, Si less than or equal to 0.1 percent, N less than or equal to 0.1 percent, Al less than or equal to 1.0 percent, Mg less than or equal to 0.8 percent and impurities less than or equal to 3 percent.
The cored wire is of a three-layer structure, the diameter of a calcium core of an inner layer is 7.5 mm-8.5 mm, a high-temperature-resistant resin fiber paper is arranged in a middle layer, the cored wire is prevented from being melted quickly, splashing is caused on the surface of molten steel, the molten steel is prevented from overturning, an outer layer steel belt is 0.8 mm-0.9 mm, and the material is 08 steel. Because the steel sheet and the high-temperature resistant resin fiber paper of the cored wire are completely melted after entering molten steel, calcium-containing steam cannot overflow in a large amount, and the calcium treatment effect is improved.
The anti-splashing solid calcium metal cored wire is characterized in that the wire feeding process in the stainless steel refining process comprises the following steps: the feeding position is adjusted through the guide pipe, the calcium metal core-spun yarn is fed above bottom blowing argon, the feeding speed is 200-300 m/min at the position 200-300 mm below the liquid steel surface, a high-speed wire feeding machine is used for feeding solid calcium metal core-spun yarns to a steel ladle in the wire feeding process of a stainless steel LF (ladle furnace), the wire feeding speed of the high-speed wire feeding machine is high, the core-spun yarns can reach the bottom of the steel ladle rapidly, molten calcium enters molten steel to flow upwards, the argon blowing flow is adjusted to be 150-200 Nl/min, the molten steel is mixed and dissolved, the stirring time is 3-5 min, and the calcium is distributed uniformly in the molten steel. After the wire feeding is finished, the argon blowing flow is adjusted to be 30-50 Nl/min, the continuous stirring time is 15-20 min, the metal calcium is ensured to fully react in the molten steel, and the effect of purifying the molten steel is achieved.
The invention has the beneficial effects that:
(1) the invention utilizes the wire feeding process of the anti-splashing solid calcium metal cored wire in stainless steel refining, can obviously reduce the splashing effect of calcium on the surface of molten steel by controlling the feeding speed, the feeding time, the feeding position, the argon blowing amount and the like, achieves the effect of purifying the molten steel, and has the characteristics of safe and convenient operation and high yield;
(2) the method effectively solves the problems of boiling addition, low calcium yield and the like in the stainless steel refined calcium treatment process, and compared with the traditional calcium feeding line process, the method has the advantages that the calcium yield is high, the calcium yield is stable at 20.3-25.8%, and the average yield is 23.1%;
(3) the invention is improved aiming at the prior art and is mainly characterized in that a layer of high-temperature resistant resin fiber paper is wound on the surface of solid calcium metal, so that the core-spun yarn is prevented from being molten fast, splashing is caused on the surface of molten steel, and the molten steel is prevented from overturning.
Drawings
Fig. 1 is a schematic structural diagram of a solid calcium metal cored wire.
In the figure, 1 is solid calcium, 2 is made of high-temperature resistant resin fiber, and 3 is a steel belt.
Detailed Description
The present invention is further illustrated by, but is not limited to, the following examples.
The solid calcium metal cored wire adopted by the invention comprises the following components and structures:
the core-spun yarn comprises the following components in percentage by mass: ca97.2%, Si0.07%, N0.08%, Al0.7%, Mg0.5%, impurity 1.45%.
The cored wire is of a three-layer structure, the calcium core diameter of the inner layer is 8.0mm, the middle layer is made of high-temperature-resistant resin fiber paper, the cored wire is prevented from being melted quickly and splashing on the surface of molten steel, the molten steel is prevented from overturning, the outer layer steel belt is 0.8mm, and the material is 08 steel. Because the steel sheet and the high temperature resistant resin fiber paper of the cored wire are completely melted after entering the molten steel, calcium-containing steam cannot overflow in a large quantity, and the calcium treatment effect is improved.
The anti-splashing solid calcium metal cored wire is characterized in that the wire feeding process in the stainless steel refining process comprises the following steps: the feeding position is adjusted through the guide pipe, the calcium metal core-spun yarn is fed above bottom blowing argon, the feeding speed is 200-300 m/min at the position 200-300 mm below the liquid steel surface, a high-speed wire feeding machine is used for feeding solid calcium metal core-spun yarns to a steel ladle in the wire feeding process of a stainless steel LF (ladle furnace), the wire feeding speed of the high-speed wire feeding machine is high, the core-spun yarns can reach the bottom of the steel ladle rapidly, molten calcium enters molten steel to flow upwards, the argon blowing flow is adjusted to be 150-200 Nl/min, the molten steel is mixed and dissolved, the stirring time is 3-5 min, and the calcium is distributed uniformly in the molten steel. After the wire feeding is finished, the argon blowing flow is adjusted to be 30-50 Nl/min, the continuous stirring time is 15-20 min, the metal calcium is ensured to fully react in the molten steel, and the effect of purifying the molten steel is achieved.
The specific embodiment provided by the invention adopts the following parameters:
the method comprises the steps of conducting a 4-furnace ladle feeding anti-splashing solid metal calcium cored wire test in an LF furnace, wherein the test steel is ultra-pure ferrite stainless steel, the wire feeding speed of a high-speed wire feeding machine is 200m/min, the feeding amount is 2.5m/t, the calcium cored wire is fed through a furnace door of the LF furnace, the diameter of a calcium core is 8mm, the medium stirring flow is 150Nl/min in the wire feeding process, the stirring time is 5min, the calcium core is slightly splashed, the argon gas adopts the weak stirring flow of 50Nl/min after the wire feeding is finished, the stirring is continued for 15min, and molten steel does not tumble in the process. Table 1 shows that the yield of calcium is stabilized at 20.3-25.8% and the average yield is 23.1% due to the change of the calcium content in steel after calcium treatment.
TABLE 1 change in calcium content in the steels%
As can be seen from the data in table 1, calcium reacts with the inclusions gradually with time, and the content decreases, improving the inclusions. The sampling nodes in table 1 were obtained by sampling 4 furnaces of steel, respectively. The change of the calcium content after the calcium line is finished can show that the calcium reacts with the inclusions gradually with the time, the content is reduced, and the inclusions are improved. Compared with the prior art, the yield is improved (the single weight of the calcium line is 59g/m in the embodiment).
Claims (5)
1. The wire feeding process of the anti-splashing solid calcium metal cored wire in stainless steel refining is characterized by comprising the following steps of: in the wire feeding process of a stainless steel LF furnace, the feeding position is adjusted through a guide pipe, a high-speed wire feeding machine is used for feeding solid calcium metal cored wires to a steel ladle, and the wire feeding speed is 200-300 m/min; when the calcium metal core-spun yarn is fed, the argon blowing flow is adjusted to be 150-200 Nl/min, the calcium metal core-spun yarn is mixed with molten steel and dissolved, the stirring time is 3-5 min, and calcium is uniformly distributed in the molten steel.
2. The wire feeding process of the anti-splashing solid calcium metal core-spun wire in stainless steel refining as claimed in claim 1, wherein: the feeding position of the calcium metal core-spun yarn is above the bottom blowing argon and 200-300 mm below the surface of the molten steel.
3. The wire feeding process of the anti-splashing solid metal calcium cored wire in stainless steel refining according to the claim 1, characterized in that: after the wire feeding is finished, adjusting the argon blowing flow to be 30-50 Nl/min, and continuing stirring for 15-20 min; so that the metallic calcium fully reacts in the molten steel.
4. The wire feeding process of the anti-splashing solid metal calcium cored wire in stainless steel refining according to the claim 1, characterized in that: the solid calcium metal cored wire comprises 100 percent of Ca more than or equal to 95 percent, Si less than or equal to 0.1 percent, N less than or equal to 0.1 percent, Al less than or equal to 1.0 percent, Mg less than or equal to 0.8 percent and impurities less than or equal to 3 percent.
5. The wire feeding process of the anti-splashing solid metal calcium cored wire in stainless steel refining according to the claim 1, characterized in that: the solid calcium metal cored wire is of a three-layer structure, the diameter of an inner calcium core is 7.5 mm-8.5 mm, the middle layer is made of high-temperature-resistant resin fiber paper, the cored wire is prevented from being melted quickly, splashing is caused on the surface of molten steel, the molten steel is prevented from overturning, an outer steel belt is 0.8 mm-0.9 mm, and the material is 08 steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210145538.6A CN114574657A (en) | 2022-02-17 | 2022-02-17 | Wire feeding process of anti-splashing solid calcium metal cored wire in stainless steel refining |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210145538.6A CN114574657A (en) | 2022-02-17 | 2022-02-17 | Wire feeding process of anti-splashing solid calcium metal cored wire in stainless steel refining |
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| CN114574657A true CN114574657A (en) | 2022-06-03 |
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| CN202210145538.6A Pending CN114574657A (en) | 2022-02-17 | 2022-02-17 | Wire feeding process of anti-splashing solid calcium metal cored wire in stainless steel refining |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586542A (en) * | 2012-04-10 | 2012-07-18 | 上海马腾新型材料厂 | Metal calcium core composite cored wire and preparation method thereof |
| CN103695597A (en) * | 2013-12-11 | 2014-04-02 | 首钢总公司 | Molten steel calcium treatment process adopting pure calcium line |
| CN210916141U (en) * | 2019-04-30 | 2020-07-03 | 上海盛宝冶金科技有限公司 | High-efficient splash-proof pure calcium cored wire |
| WO2020255917A1 (en) * | 2019-06-17 | 2020-12-24 | Ｊｆｅスチール株式会社 | METHOD FOR ADDING Ca TO MOLTEN STEEL |
-
2022
- 2022-02-17 CN CN202210145538.6A patent/CN114574657A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586542A (en) * | 2012-04-10 | 2012-07-18 | 上海马腾新型材料厂 | Metal calcium core composite cored wire and preparation method thereof |
| CN103695597A (en) * | 2013-12-11 | 2014-04-02 | 首钢总公司 | Molten steel calcium treatment process adopting pure calcium line |
| CN210916141U (en) * | 2019-04-30 | 2020-07-03 | 上海盛宝冶金科技有限公司 | High-efficient splash-proof pure calcium cored wire |
| WO2020255917A1 (en) * | 2019-06-17 | 2020-12-24 | Ｊｆｅスチール株式会社 | METHOD FOR ADDING Ca TO MOLTEN STEEL |
Non-Patent Citations (1)
| Title |
|---|
| 苏平虎: "钙处理技术在钢水精炼中的应用", 《山西冶金》 * |
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Application publication date: 20220603 |