CN111440923A - Covering slag for high-carbon high-alloy wear-resistant steel and preparation method thereof - Google Patents
Covering slag for high-carbon high-alloy wear-resistant steel and preparation method thereof Download PDFInfo
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- CN111440923A CN111440923A CN202010331565.3A CN202010331565A CN111440923A CN 111440923 A CN111440923 A CN 111440923A CN 202010331565 A CN202010331565 A CN 202010331565A CN 111440923 A CN111440923 A CN 111440923A
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
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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
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Abstract
The invention relates to the field of steelmaking and discloses a covering slag for high-carbon high-alloy wear-resistant steel and a preparation method thereof, wherein the covering slag comprises basic material slag, a cosolvent and a melting speed regulator; wherein, the basic material slag comprises the following components: 27.6 to 33.6 wt% and SiO2: 29.2-35.2 wt%; the cosolvent comprises Al2O3: 3.8-6.6 wt%, F: 3.8 to 9.0 wt% and Na2O: 6.6-9.2 wt%; the melting speed regulator comprises the following components: 11.7 to 14.3 wt%. Solves the problem that the high-carbon high-alloy wear-resistant steel is easy to generate longitudinal cracks on the surface of a casting blank.
Description
Technical Field
The invention relates to the field of steelmaking, in particular to covering slag for high-carbon high-alloy wear-resistant steel and a preparation method thereof.
Background
The wear-resistant steel has high surface hardness, good toughness and excellent wear resistance, and is widely applied to the field of mine mining. Besides high carbon content, the steel grade also needs to be added with high alloy elements (Si, Mn and Cr) to meet the requirement of the wear resistance of the steel grade. Because the steel grade is high in solidification shrinkage rate due to the characteristics of the high-carbon high-alloy steel grade, and the strength of a solidified blank shell is poor, if the steel grade is out of order in working conditions or the performances of the covering slag are not matched, longitudinal cracks are easy to generate on the surface of a casting blank, and at present, when domestic steel mills solve the problem of the surface longitudinal cracks of the steel grade, the steel grade is realized mainly by optimizing a process and regulating and controlling the physical and chemical indexes of the covering slag. The casting powder is mainly regulated and controlled from two aspects of lubrication and heat transfer, but because the process control requirement is strict, the application range is narrow, the surface longitudinal crack defect is generated if the casting powder is slightly irregular, the surface defect can influence the steel rolling yield, and great economic loss is brought to enterprises. Therefore, how to grasp the adjustment range of the physical and chemical indexes of the covering slag, solve the problem of surface longitudinal crack defects, ensure the smooth continuous casting and improve the product quality becomes the problem which is urgently needed to be solved by various domestic steel mills.
Disclosure of Invention
The invention aims to provide casting powder for high-carbon high-alloy wear-resistant steel and a preparation method thereof, and solves the problem that the high-carbon high-alloy wear-resistant steel is easy to generate longitudinal cracks on the surface of a casting blank.
In order to achieve the above object, the present invention provides a mold flux for high-carbon high-alloy wear-resistant steel, comprising a base material slag, a cosolvent, and a melt velocity modifier;
wherein, the basic material slag comprises the following components: 27.6 to 33.6 wt% and SiO2：29.2～35.2wt％；
The cosolvent comprises Al2O3: 3.8-6.6 wt%, F: 3.8 to 9.0 wt% and Na2O：6.6～9.2wt％；
The melting speed regulator comprises the following components: 11.7 to 14.3 wt%.
The invention also provides a preparation method for the high-carbon high-alloy wear-resistant steel, which comprises the steps of mixing the basic material slag, the cosolvent and the melting speed regulator, melting, cooling, drying and grinding.
According to the technical scheme, the invention provides the covering slag for the high-carbon high-alloy wear-resistant steel and the preparation method thereof, wherein CaO and SiO are adopted2Al as a main component of mold flux2O3Play a role ofF and Na for improving melting point and viscosity of mold flux2O plays a role in reducing the melting point and viscosity of the covering slag, and C plays a role in controlling the sintering performance of the covering slag and adjusting the melting rate. The control and the effect of each chemical component of the covering slag have the following characteristics: CaO: which is one of the main components of the mold flux, CaO is decomposed into Ca at high temperature2+And O2-，O2-The casting powder can react with a silicon-oxygen tetrahedral structure to break silicon-oxygen bonds and reduce the viscosity of the casting powder, but the slag film is unevenly filled due to too low viscosity, so longitudinal cracking and steel leakage accidents are easily caused, and the CaO content is controlled as follows: 27.6 to 33.6 percent. SiO 22: formed of silicon-oxygen complex anions, SiO2The content is increased, so that the alkalinity of the casting powder is reduced, the proportion of the glass body is increased, the lubricating effect is improved, but the excessive proportion of the glass body easily causes high heat transfer speed and cracks on the surface of a blank shell, so that the invention controls SiO2The contents are as follows: 29.2 to 35.2 percent. Al (Al)2O3: is an amphoteric oxide, and Al is present when the basicity is high2O3In the form of acidic oxides, Al3+Forming a more complex network structure by combining with the silicon-oxygen complex ion groups, so that the melting point and the viscosity of the casting powder are increased, and when the alkalinity is lower, Al is added2O3In the form of basic oxides, Al2O3Belongs to a network external body, and can dissociate complex anionic groups, and the melting point and the viscosity of the casting powder can be reduced, so that Al2O3The content is not suitable to be too low or too high, and the invention controls Al2O3The contents are as follows: 3.8 to 6.6 percent. F: f is present in the slag in the form of F-Small electrostatic potential, large quantity, easy to replace O in slag2-The silica complex ions with complex structures formed by polymerization in the slag are split into simpler silica complex ions, so that F plays a role in fluxing in the covering slag, when the content of F is lower than 3.8%, the viscosity and the melting point are higher, the requirement of medium-high carbon lubrication conditions cannot be met, and when the content of F is higher than 9.0%, the lubrication regulation is excessive, so that the content of F is controlled as follows: 3.8 to 9.0 percent. Na (Na)2O: acting as F, a fluxing agent for the mold flux, Na + and a silicon-oxygen tetrahedronA corner forms a bond which prevents the formation of network chains or breaks the network chains from the siloxy tetrahedron, O2-As non-bridge oxygen, the complex network structure can be destroyed and dispersed into simple anionic groups, the melting point and viscosity of the casting powder are greatly reduced by the combined action of the two ions, but the content is too high, the vitreous proportion is high, and the crystallization heat transfer is not facilitated, so the Na-controlled casting powder has the advantages of controlling Na2The content of O is: 6.6 to 9.2 percent. C: the invention plays a skeleton role in the casting powder, when the carbon content is too low, the heat transfer rate is high, the surface crack of the casting blank is easy to cause, when the carbon content is too high, the melting speed of the casting powder is low, and the melting of the casting powder is not facilitated, so the invention controls the C content as follows: 11.7 to 14.3 percent. The binary alkalinity of the casting powder controlled by the invention is 0.87-1.03, and when the alkalinity is changed within the range of 0.87-1.03, O in CaO increases along with the increase of the alkalinity2-The silicon-oxygen composite anion group is dissociated, the flowing property of the covering slag is greatly improved, but when the alkalinity is lower than 0.87, the alkalinity is too low, the heat transfer rate of a crystallizer is high, cracks are easy to appear on the surface and the corners of a blank shell, the viscosity of the covering slag is too high, and when the alkalinity is higher than 1.03, the crystallization property is too strong, and the melting point of the covering slag is increased. Therefore, the alkalinity of the casting powder controlled by the invention is 0.87-1.03.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a covering slag for high-carbon high-alloy wear-resistant steel, which comprises basic material slag, a cosolvent and a melting speed regulator;
wherein, the basic material slag comprises the following components: 27.6 to 33.6 wt% and SiO2：29.2～35.2wt％；
The cosolvent comprises Al2O3: 3.8-6.6 wt%, F: 3.8 to 9.0 wt% and Na2O：6.6～9.2wt％；
The melting speed regulator comprises the following components: 11.7 to 14.3 wt%.
In a preferred embodiment of the present invention, the moisture of the mold flux is not higher than 0.2 wt%.
In a preferred embodiment of the present invention, the mold flux has an average particle size of 180-220 mesh.
In a preferred embodiment of the present invention, the basicity of the mold flux is 0.87 to 1.03;
preferably, the viscosity is 0.20 to 0.30 Pa.s.
In a preferred embodiment of the present invention, the melting point of the mold flux is 1090 to 1150 ℃.
The invention also provides a preparation method of the covering slag for the high-carbon high-alloy wear-resistant steel, which comprises the steps of mixing the basic material slag, the cosolvent and the melting speed regulator in the claim 1, melting, cooling, drying and grinding to obtain the covering slag.
The present invention will be described in detail below by way of examples.
Example 1
Mixing the basic material slag, the cosolvent and the melting speed regulator, melting, cooling, drying and grinding to obtain the covering slag, wherein the covering slag comprises the following components in percentage by mass: CaO 30.3%, SiO232.1％、Al2O35.5％、Na27.5 percent of O, 7.1 percent of F and 13.1 percent of C, and controlling the alkalinity to be 0.94.
Example 2
Mixing the basic material slag, the cosolvent and the melting speed regulator, melting, cooling, drying and grinding to obtain the covering slag, wherein the covering slag comprises the following components in percentage by mass: CaO 29.8％、SiO233.6％、Al2O34.7％、Na28.6 percent of O, 7.5 percent of F and 10.6 percent of C, and the alkalinity is controlled to be 0.89.
Example 3
Mixing the basic material slag, the cosolvent and the melting speed regulator, melting, cooling, drying and grinding to obtain the covering slag, wherein the covering slag comprises the following components in percentage by mass: CaO 31.6%, SiO231.2％、Al2O34.1％、Na26.8 percent of O, 8.2 percent of F and 14.3 percent of C, and controlling the alkalinity to be 1.01.
Comparative example 1
The process is carried out according to the method of the embodiment 1, except that the mass percent of each component in the casting powder is as follows: CaO27.0%, SiO231.8％、Al2O36.9％、Na28.4 percent of O, 7.3 percent of F and 13.9 percent of C, and controlling the alkalinity to be 0.85.
Comparative example 2
The process is carried out according to the method of the embodiment 1, except that the mass percent of each component in the casting powder is as follows: CaO34.1%, SiO232.2％、Al2O35.1％、Na27.2 percent of O, 6.3 percent of F and 12.5 percent of C, and controlling the alkalinity to be 1.06.
Comparative example 3
The process is carried out according to the method of the embodiment 1, except that the mass percent of each component in the casting powder is as follows: CaO34.9%, SiO230.9％、Al2O35.4％、Na27.9 percent of O, 6.8 percent of F and 12.8 percent of C, and controlling the alkalinity to be 1.13.
Table 1 typical chemical composition data/% of corresponding steel grades
| C | Si | Mn | P | Cr |
| 0.65～0.70 | 1.85～1.90 | 0.85～0.90 | ≤0.030 | 0.90～0.95 |
TABLE 2 Property data of mold flux in examples
TABLE 3 use conditions of mold flux in examples 1 to 3 and comparative examples 1 to 3
TABLE 4 effects of mold flux in examples
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (6)
1. The mold flux for the high-carbon high-alloy wear-resistant steel is characterized by comprising basic material slag, a cosolvent and a melting speed regulator;
wherein, the basic material slag comprises the following components: 27.6 to 33.6 wt% and SiO2：29.2～35.2wt％；
The cosolvent comprises Al2O3: 3.8-6.6 wt%, F: 3.8 to 9.0 wt% and Na2O：6.6～9.2wt％；
The melting speed regulator comprises the following components: 11.7 to 14.3 wt%.
2. The mold flux of claim 1, wherein the moisture of the mold flux is not higher than 0.2 wt%.
3. The mold flux of claim 1, wherein the average particle size of the mold flux is 180-220 mesh.
4. The mold flux according to claim 1, wherein the basicity of the mold flux is 0.87 to 1.03;
preferably, the viscosity is 0.20 to 0.30 Pa.s.
5. The mold flux of claim 1, wherein the melting point of the mold flux is 1090 to 1150 ℃.
6. A preparation method of the covering slag for high-carbon high-alloy wear-resistant steel is characterized by comprising the steps of mixing the basic material slag, the cosolvent and the melting speed regulator according to claim 1, melting, cooling, drying and grinding to obtain the covering slag.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010331565.3A CN111440923A (en) | 2020-04-24 | 2020-04-24 | Covering slag for high-carbon high-alloy wear-resistant steel and preparation method thereof |
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| CN202010331565.3A CN111440923A (en) | 2020-04-24 | 2020-04-24 | Covering slag for high-carbon high-alloy wear-resistant steel and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112756573A (en) * | 2020-12-24 | 2021-05-07 | 芜湖新兴铸管有限责任公司 | Casting powder for engineering machinery bucket tooth steel and preparation method thereof |
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| CN102233411A (en) * | 2011-06-27 | 2011-11-09 | 河南通宇冶材集团有限公司 | Low-alkalinity crystallizer covering slag prepared from building waste clay |
| CN102398003A (en) * | 2010-09-16 | 2012-04-04 | 攀钢集团钢铁钒钛股份有限公司 | Crystallizer covering slag for continuous casting and method for continuously casting medium and low-carbon steel round billets |
| CN103736953A (en) * | 2013-12-24 | 2014-04-23 | 郑州裕丰高新材料有限公司 | Pre-molten type square billet crystallizer casting powder and preparation method thereof |
| CN105328151A (en) * | 2015-12-07 | 2016-02-17 | 河南通宇冶材集团有限公司 | Casting powder for continuous casting crystallizer and preparation method of casting powder |
| CN110976798A (en) * | 2019-12-26 | 2020-04-10 | 芜湖新兴铸管有限责任公司 | Continuous casting crystallizer covering slag for medium-high carbon steel |
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2020
- 2020-04-24 CN CN202010331565.3A patent/CN111440923A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102398003A (en) * | 2010-09-16 | 2012-04-04 | 攀钢集团钢铁钒钛股份有限公司 | Crystallizer covering slag for continuous casting and method for continuously casting medium and low-carbon steel round billets |
| CN102233411A (en) * | 2011-06-27 | 2011-11-09 | 河南通宇冶材集团有限公司 | Low-alkalinity crystallizer covering slag prepared from building waste clay |
| CN103736953A (en) * | 2013-12-24 | 2014-04-23 | 郑州裕丰高新材料有限公司 | Pre-molten type square billet crystallizer casting powder and preparation method thereof |
| CN105328151A (en) * | 2015-12-07 | 2016-02-17 | 河南通宇冶材集团有限公司 | Casting powder for continuous casting crystallizer and preparation method of casting powder |
| CN110976798A (en) * | 2019-12-26 | 2020-04-10 | 芜湖新兴铸管有限责任公司 | Continuous casting crystallizer covering slag for medium-high carbon steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112756573A (en) * | 2020-12-24 | 2021-05-07 | 芜湖新兴铸管有限责任公司 | Casting powder for engineering machinery bucket tooth steel and preparation method thereof |
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Application publication date: 20200724 |