CN110653350B - Manufacturing method of casting blank with high carbon content on surface layer - Google Patents
Manufacturing method of casting blank with high carbon content on surface layer Download PDFInfo
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- CN110653350B CN110653350B CN201910938870.6A CN201910938870A CN110653350B CN 110653350 B CN110653350 B CN 110653350B CN 201910938870 A CN201910938870 A CN 201910938870A CN 110653350 B CN110653350 B CN 110653350B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/108—Feeding additives, powders, or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
Abstract
The invention relates to a method for manufacturing a casting blank with a high carbon content on the surface layer, which is characterized in that during the continuous casting of a steel billet, a self-heating recarburizing agent is added on the surface of protective slag in a crystallizer, which is close to the wall of the crystallizer within the range of 0-100 mm, a large amount of hot melting protective slag is discharged by the self-heating recarburizing agent and is mixed with the protective slag to form a recarburizing protective slag flowing device blank gap with high carbon content, the recarburizing protective slag contacts with molten steel at the meniscus and a high-temperature primary blank shell, and carbon elements are diffused. Along with the increase of the thickness of the shell and the reduction of the temperature, the diffusion speed of the carbon element into the casting blank is sharply reduced, and even the diffusion is stopped. Thus, the surface high-carbon continuous casting billet with relatively high carbon content on the surface and low carbon content inside is obtained. According to the invention, the surface layer of the casting blank is carburized in the continuous casting process, and an additional carburization treatment process is not required; the carburized layer is thick; the cost is low; the efficiency is high.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to a method for manufacturing a casting blank with a high carbon content on the surface layer.
Background
The steel with high carbon content on the surface layer is composite performance steel with toughness of base steel and different performances of high hardness and high strength of the surface layer steel, can greatly improve the comprehensive performance and the service life of the steel in the use process, and is a development direction for steel application. However, few methods are available for carburizing the surface layer of steel, and the cost is high, for example, carburization and the like, the thickness of the carbon-added layer on the surface layer is small, so that it is difficult to completely meet the performance requirements, and the cost of treatment is high, which results in high price. At present, continuous casting is the main production method of steel, so that a method for producing a steel casting blank at a lower cost and with higher efficiency while realizing surface layer carburization is urgently needed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for manufacturing a casting blank with a high carbon content on the surface layer, so that the surface layer of the casting blank is carburized in the continuous casting process, and an additional carburization treatment process is not needed.
In order to achieve the purpose, the invention adopts the following technical scheme:
a manufacturing method of a casting blank with a high carbon content on the surface layer specifically comprises the following steps:
1) after the continuous casting is started, a self-heating recarburizing agent distributor is used for distributing and scattering a self-heating recarburizing agent above the covering slag within a range of 0-100 mm away from the inner wall of the crystallizer, the self-heating recarburizing agent is kept to cover the liquid level of the steel all the time, and the thickness of the self-heating recarburizing agent is within a range of 0.1-10 mm;
2) the self-heating recarburizer is heated by the covering slag, the self-heating recarburizer and the surface layer solid covering slag are melted and mixed with the molten covering slag to form recarburizer covering slag, and the recarburizer covering slag flows into a gap between the crystallizer and the casting blank;
3) the recarburization covering slag is contacted with the meniscus molten steel, carbon elements in the self-heating recarburization agent are diffused to the molten steel near the meniscus, and the recarburized molten steel is solidified to form a primary high-temperature blank shell;
4) and the recarburizing covering slag flows into a gap between the crystallizer and the primary high-temperature blank shell and is always contacted with the molten steel and the solidified blank shell, and in the process, the carbon element in the self-heating recarburizing agent is continuously diffused to the surface layer of the casting blank to obtain a surface layer high-carbon continuous casting blank with relatively high carbon content on the surface layer and low carbon content inside the casting blank.
The self-heating carburant comprises the following components in percentage by weight: al: 5% -30%, C: 20 to 65% of SiO2：5％～30％，Na2O：0.1％～20％，K2O：0.1％～20％，CaO：0.1％～20％。
The surface layer high-carbon casting blank is 0.1-12 mm thick in recarburization layer, the mass percentage content of carbon on the outermost surface layer is 0.05-3.5%, and the carbon content gradually decreases towards the interior of the casting blank until the carbon content is the same as that of the matrix.
Compared with the prior art, the invention has the beneficial effects that:
1) the surface layer of the casting blank is carburized in the continuous casting process, and an additional carburization treatment process is not needed.
2) The carburized layer is thick.
3) The cost is low.
4) The efficiency is high.
Drawings
FIG. 1 is a schematic diagram of the recarburization treatment of the surface layer of a casting blank in the continuous casting process.
In the figure: the device comprises a carburant distributor 1, a self-heating carburant 2, a crystallizer 3, molten covering slag 4, solid covering slag 5, molten steel 6, a slag ring 7, a solidified blank shell 8, solidified covering slag 9 and carburant covering slag 10.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
a manufacturing method of a casting blank with a high carbon content on the surface layer comprises the following specific steps:
1. preparing a self-heating carburant, wherein the self-heating carburant comprises the following components in percentage by weight: al: 5% -30%, C: 20 to 65% of SiO2：5％～30％，Na2O：0.1％～20％，K2O：0.1％～20％，CaO：0.1％～20％。
2. Placing a self-heating recarburizer into a recarburizer distributor additionally arranged above the crystallizer;
3. after the continuous casting starts, the carburant distributor vibrates along with the crystallizer;
4. as shown in figure 1, the self-heating recarburizer flows out by vibration and falls into the crystallizer on the casting powder within 0-100 mm from the wall of the crystallizer. Keeping the self-heating recarburizer to cover the steel liquid level all the time, wherein the thickness of the self-heating recarburizer is within the range of 2-10 mm; the self-heating recarburizer falls into the crystallizer, the self-heating recarburizer is heated by the covering slag, the aluminum powder reacts with oxygen in the air, the self-heating recarburizer and the surface layer solid covering slag are melted by heating, and the self-heating recarburizer and the surface layer solid covering slag are mixed together to form recarburizer covering slag and flow into a gap between the crystallizer and a casting blank;
5. the recarburization covering slag is contacted with the meniscus molten steel, carbon elements in the self-heating recarburization agent are diffused to the molten steel near the meniscus, and the recarburized molten steel is solidified to form a primary high-temperature blank shell;
6. then the recarburization covering slag flows into a gap between the crystallizer and the primary high-temperature casting blank shell and is always contacted with the molten steel and the solidified blank shell, and in the process, the carbon element in the self-heating recarburization agent continuously diffuses towards the surface layer of the casting blank. Along with the increase of the thickness of the shell and the reduction of the temperature, the diffusion speed of the carbon element into the casting blank is sharply reduced, and even the diffusion is stopped. Thus, a surface-layer high-carbon cast slab was obtained.
Example 1
The continuous casting steel comprises the following steps: q235, the self-heating carburant 2 comprises the following components: 40% of carbon powder, 15% of aluminum powder and SiO2Powder 25% and Na2O+K25% of O powder and 10% of CaO powder.
1. Preparing a self-heating carburant 2 and a distributor 1;
2. installing a distributing device 1 on a crystallizer 3, and filling a self-heating recarburizing agent 2 into the distributing device 1;
3. after the continuous casting starts, the distributor vibrates along with the crystallizer;
4. the self-heating recarburizer 2 is vibrated to flow out and fall into the crystallizer 3 on the covering slag within 0-30 mm from the wall of the crystallizer. The self-heating recarburizer 2 is heated by the covering slag, the aluminum powder in the self-heating recarburizer 2 reacts with oxygen in the air, the self-heating recarburizer 2 and the surface layer solid covering slag 5 are melted by heating, and the self-heating recarburizer 2 and the surface layer solid covering slag are mixed with the molten covering slag 4 to form recarburizer covering slag 10 which flows into a gap between a crystallizer and a casting blank;
5. the recarburization covering slag 10 is contacted with the meniscus molten steel 6, carbon elements in the self-heating recarburization agent 2 are diffused to the molten steel 6 near the meniscus, and the recarburized molten steel is solidified to form a primary high-temperature shell;
6. then the recarburization covering slag 10 flows into a gap between the crystallizer 3 and the primary high-temperature casting blank shell and is always contacted with the molten steel 6 and the solidified blank shell 8, and in the process, the carbon element in the self-heating recarburization agent 2 continuously diffuses towards the surface layer of the casting blank. Along with the increase of the thickness of the shell and the reduction of the temperature, the diffusion speed of the carbon element into the casting blank is sharply reduced, and even the diffusion is stopped.
7. And obtaining a surface layer high-carbon casting blank, wherein the thickness of the recarburization layer is 8mm, the carbon content of the outermost surface layer is 0.60%, and the carbon content gradually decreases towards the interior of the casting blank until the carbon content at the 8mm depth is the same as that of the matrix.
Example 2
The continuous casting steel comprises the following steps: q345, the self-heating carburant 2 comprises the following components: 30% of carbon powder, 15% of aluminum powder and SiO2Powder 25% and Na2O+K25% of O powder and 15% of CaO powder.
1. Preparing a self-heating carburant 2 and a distributor 1.
2. The distributor 1 is arranged on the crystallizer 3, and the self-heating recarburizing agent 2 is filled into the distributor 1.
3. The distributor vibrates with the crystallizer after the continuous casting starts.
4. The self-heating recarburizer 2 is vibrated to flow out and fall into the crystallizer 3 on the covering slag within 0-35 mm from the wall of the crystallizer. The self-heating recarburizer 2 is heated by the covering slag, the aluminum powder in the self-heating recarburizer 2 reacts with oxygen in the air, the self-heating recarburizer 2 and the surface layer solid covering slag 5 are melted by heating, and the self-heating recarburizer 2 and the surface layer solid covering slag are mixed with the molten covering slag 4 to form recarburizer covering slag 10 which flows into a gap between a crystallizer and a casting blank.
5. The recarburization covering slag 10 is contacted with the meniscus molten steel 6, carbon elements in the self-heating recarburization agent 2 are diffused to the molten steel 6 near the meniscus, and the recarburization molten steel is solidified to form a primary high-temperature shell.
6. Then the recarburization covering slag 10 flows into a gap between the crystallizer 3 and the primary high-temperature casting blank shell and is always contacted with the molten steel 6 and the solidified blank shell 8, and in the process, the carbon element in the self-heating recarburization agent 2 continuously diffuses towards the surface layer of the casting blank. Along with the increase of the thickness of the shell and the reduction of the temperature, the diffusion speed of the carbon element into the casting blank is sharply reduced, and even the diffusion is stopped.
7. And obtaining a surface layer high-carbon casting blank, wherein the thickness of the recarburization layer is 9.5mm, the carbon content of the outermost surface layer is 0.65%, and the carbon content gradually decreases towards the interior of the casting blank until the carbon content at the depth of 9.5mm is the same as that of the matrix.
The foregoing is considered as illustrative only of the principles of the invention and is not to be in any way limiting, since all equivalent changes and modifications are intended to be included within the scope of the appended claims.
Claims (3)
1. The manufacturing method of the casting blank with the high carbon content on the surface layer is characterized by comprising the following specific steps:
1) after the continuous casting is started, a self-heating recarburizing agent distributor is used for distributing and scattering a self-heating recarburizing agent above the covering slag within a range of 0-100 mm away from the inner wall of the crystallizer, the self-heating recarburizing agent is kept to cover the liquid level of the steel all the time, and the thickness of the self-heating recarburizing agent is within a range of 0.1-10 mm;
2) the self-heating recarburizer is heated by the covering slag, the self-heating recarburizer and the surface layer solid covering slag are melted and mixed with the molten covering slag to form recarburizer covering slag, and the recarburizer covering slag flows into a gap between the crystallizer and the casting blank;
3) the recarburization covering slag is contacted with the meniscus molten steel, carbon elements in the self-heating recarburization agent are diffused to the molten steel near the meniscus, and the recarburized molten steel is solidified to form a primary high-temperature blank shell;
4) and the recarburizing covering slag flows into a gap between the crystallizer and the primary high-temperature blank shell and is always contacted with the molten steel and the solidified blank shell, in the process, the carbon element in the self-heating recarburizing agent is continuously diffused to the surface layer of the casting blank, and the casting blank with the surface layer, relatively high carbon content and low carbon content inside the casting blank is obtained after continuous casting.
2. The method for manufacturing the casting blank with the high carbon content on the surface layer according to claim 1, wherein the self-heating carburant comprises the following components in percentage by weight: al: 5% -30%, C: 20 to 65 percent of SiO2：5%～30%，Na2O：0.1%～20%，K2O：0.1%～20%，CaO：0.1%～20%。
3. The method for manufacturing the surface-layer high-carbon-content casting blank according to claim 1, wherein the surface-layer high-carbon-content casting blank has a recarburization layer thickness of 0.1-12 mm, the mass percentage of carbon in the outermost surface layer is 0.05-3.5%, and the carbon content gradually decreases towards the inside of the casting blank until the carbon content is the same as that of the matrix.
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| CN1288789A (en) * | 1999-09-21 | 2001-03-28 | 许壮凌 | Cast steel billet surface treatment method and special crystallizer |
| JP2001172740A (en) * | 1999-12-16 | 2001-06-26 | Kawasaki Steel Corp | Steel excellent in coastal weather resistance and producing method therefor |
| JP2003260549A (en) * | 2002-03-11 | 2003-09-16 | Jfe Steel Kk | Continuous casting method |
| CN202667578U (en) * | 2012-04-25 | 2013-01-16 | 莱芜钢铁集团有限公司 | Continuous casting device of gradient steel materials |
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| CN107739775A (en) * | 2017-10-31 | 2018-02-27 | 攀钢集团攀枝花钢铁研究院有限公司 | The anti-corrosion Rail Production method of high speed of evanohm is sprayed in casting process |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5578143A (en) * | 1993-11-22 | 1996-11-26 | Nippon Steel Corporation | Continuously cast slab of extremely low carbon steel with less surface defects in steel sheet-producing step; extremely low carbon sheet steel; and process for producing the same |
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- 2019-09-30 CN CN201910938870.6A patent/CN110653350B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288789A (en) * | 1999-09-21 | 2001-03-28 | 许壮凌 | Cast steel billet surface treatment method and special crystallizer |
| JP2001172740A (en) * | 1999-12-16 | 2001-06-26 | Kawasaki Steel Corp | Steel excellent in coastal weather resistance and producing method therefor |
| JP2003260549A (en) * | 2002-03-11 | 2003-09-16 | Jfe Steel Kk | Continuous casting method |
| CN202667578U (en) * | 2012-04-25 | 2013-01-16 | 莱芜钢铁集团有限公司 | Continuous casting device of gradient steel materials |
| CN202667581U (en) * | 2012-04-25 | 2013-01-16 | 莱芜钢铁集团有限公司 | Continuous casting device of gradient steel materials |
| CN104493117A (en) * | 2015-01-12 | 2015-04-08 | 河南通宇冶材集团有限公司 | Heating start powder for continuous casting of rectangular billet |
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