CN111996344A - High-temperature surface carbon-preserving separant for high-carbon steel and carbon-preserving method - Google Patents
High-temperature surface carbon-preserving separant for high-carbon steel and carbon-preserving method Download PDFInfo
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- CN111996344A CN111996344A CN202010870068.0A CN202010870068A CN111996344A CN 111996344 A CN111996344 A CN 111996344A CN 202010870068 A CN202010870068 A CN 202010870068A CN 111996344 A CN111996344 A CN 111996344A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
Abstract
The invention relates to the technical field of steel treatment, in particular to a high-temperature surface carbon-preserving separant for high-carbon steel and a carbon-preserving method. The high-temperature surface carbon-preserving separant for the high-carbon steel comprises dry powder and water, wherein the dry powder is prepared from diopside, nano silicon nitride, nano chromium carbide, aluminum ash powder, potash water glass (modulus is 3.0) and polyacrylamide, and the water accounts for 60-90% of the total weight of the dry powder. The high-temperature surface carbon-preserving separant for the high-carbon steel and the carbon-preserving method are suitable for protecting the medium-high carbon steel which is rolled at low temperature during heating, and can effectively reduce oxidation burning loss and inhibit the surface decarburization of a matrix; the adhesive force between the iron scale and the steel matrix can be weakened, and the iron scale and the separant layer can completely fall off after being descaled by high-pressure water after being discharged from a furnace; the heat conductivity coefficient of the separant is high, the heating time of the billet is not prolonged, and the billet is not corroded harmfully; the production and the use of the product have no pollution to the environment; the separant has the advantages of domestic raw materials, wide sources and low production cost.
Description
Technical Field
The invention relates to the technical field of steel treatment, in particular to a high-temperature surface carbon-preserving separant for high-carbon steel and a carbon-preserving method.
Background
In the heating process of the medium-high carbon steel billet before rolling, the surface of the medium-high carbon steel billet is subjected to violent oxidation reaction at high temperature, so that the surface carbon element is seriously lost, the qualified rate of rolled steel products is reduced, and the decarburization of medium-high carbon steel rolled at low temperature by two heats is less.
With the higher and higher low decarburization requirements of the market on rolled steel, the decarburization space is not improved and optimized in the production process, the level of the manufacturing industry in China is directly influenced, and the method is a technical problem troubling enterprises.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a medium-high carbon steel high-temperature surface carbon-preserving separant product and a carbon-preserving method, which can play a role in preserving carbon and isolating in a high-temperature heating process and improve the qualified product rate and the high-grade product rate of rolled products.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the high-temperature surface carbon-preserving separant for the high-carbon steel is characterized by comprising dry powder and a diluent, wherein the dry powder comprises the following raw materials in percentage by weight: 60-85% of diopside, 1-5% of nano silicon nitride, 1-5% of nano chromium carbide, 5-15% of aluminum ash powder, 6-25% of potassium water glass (modulus 3.0) and 0.1-0.5% of polyacrylamide; the diluent is water, and the weight of the water is 60-90% of the total weight of the dry powder.
The optimized granularity of the nanometer silicon nitride and the nanometer chromium carbide is both 100-500 nm.
Optimized, the dry powder comprises the following raw materials in percentage by weight: 65% of diopside, 3% of nano silicon nitride, 3.5% of nano chromium carbide, 10% of aluminum ash powder, 18% of potassium water glass (modulus 3.0) and 0.5% of polyacrylamide.
Optimized, the dry powder comprises the following raw materials in percentage by weight: 70% of diopside, 2.5% of nano silicon nitride, 4.2% of nano chromium carbide, 13% of aluminum ash powder, 10% of potassium water glass (modulus 3.0) and 0.3% of polyacrylamide.
Optimized, the dry powder comprises the following raw materials in percentage by weight: 75% of diopside, 1.9% of nano silicon nitride, 2% of nano chromium carbide, 6% of aluminum ash powder, 15% of potash water glass (modulus 3.0) and 0.1% of polyacrylamide.
Optimized, the dry powder comprises the following raw materials in percentage by weight: 82% of pyroxene, 1.4% of nano silicon nitride, 1.5% of nano chromium carbide, 9% of aluminum ash powder, 6% of potassium water glass (modulus 3.0) and 0.1% of polyacrylamide.
A method for protecting carbon on the high-temperature surface of silicon-containing steel is characterized in that any one of the high-temperature surface carbon-protecting separant for high-carbon steel is used, and the method comprises the following specific steps:
step 1, preparing a high-temperature surface carbon-preserving separant for high-carbon steel according to a raw material formula;
step 2, brushing the carbon-preserving separant on the surface of the normal-temperature high-carbon steel;
step 3, heating the high-carbon steel obtained in the step 2 in a heating furnace to 900-;
and 4, obtaining a product after heating is finished.
Further, the separant in the step 1 is prepared by a mechanical grinding and mixing method, and the particle size is less than 100 mu m.
Further, the thickness of the carbon-retaining release agent in the step 2 is 200-500 μm.
Furthermore, the heating furnace in the step 3 has the temperature rise time of 1-10 hours.
From the above description of the present invention, compared with the prior art, the high temperature surface carbon-preserving separant and the carbon-preserving method for high carbon steel according to the present invention have the following advantages:
1. the surface of the protected steel is not required to be subjected to sand blasting or grinding pretreatment, and is uniformly sprayed in a spraying mode, so that the steel does not fall off in the transportation process, and the application effect is not influenced.
2. The separant does not need to be pre-dried (including natural drying and pre-drying), can be sprayed on line and immediately enters a high-temperature furnace for heating, changes the original process very little, has less investment of coating equipment and low use cost, and can be simply matched with a billet heating continuous production line for use.
3. The medium-high carbon steel high-temperature surface carbon-preserving separant disclosed by the invention is low in protection temperature, is suitable for protecting medium-high carbon steel rolled at a low temperature during heating, and can effectively reduce oxidation burning loss and inhibit surface decarburization of a matrix.
4. The adhesive force between the iron scale and the steel matrix can be weakened, and the iron scale and the separant layer can completely fall off after being descaled by high-pressure water after being discharged from a furnace.
5. The heat conductivity coefficient of the separant is high, the heating time of the steel billet is not prolonged, and the separant does not have harmful erosion to the steel billet; it has no environmental pollution during production and use.
6. The separant has the advantages of domestic raw materials, wide sources and low production cost.
Detailed Description
The invention is further described below by means of specific embodiments.
The high-temperature surface carbon-preserving separant for the high-carbon steel is characterized by comprising dry powder and water,
the high-temperature surface carbon-preserving separant for the high-carbon steel is characterized by comprising dry powder and a diluent, wherein the dry powder comprises the following raw materials in percentage by weight: 60-85% of diopside, 1-5% of nano silicon nitride, 1-5% of nano chromium carbide, 5-15% of aluminum ash powder, 6-25% of potassium water glass (modulus 3.0) and 0.1-0.5% of polyacrylamide; the diluent is water, and the weight of the water is 60-90% of the total weight of the dry powder.
Wherein the release agent takes diopside as film-forming aggregate, which forms a vitreous body at high temperature; adding aluminum ash powder to reduce oxidation under high temperature, improve the viscosity of the glass body and improve the high temperature resistance of the separant; polyacrylamide is added as a suspending agent of the release agent, so that the release agent is prevented from precipitating and hardening for a long time; adding nano silicon nitride to improve the film forming property of the separant; the chromium carbide is added to improve the infiltration performance of the isolation layer and the substrate, and simultaneously, the recarburization and supplement of the substrate are realized, and the carbon protection effect is realized.
A method for protecting carbon on the high-temperature surface of silicon-containing steel is characterized in that any one of the high-temperature surface carbon-protecting separant for high-carbon steel is used, and the method comprises the following specific steps:
step 1, preparing a high-temperature surface carbon-preserving separant for high-carbon steel according to a raw material formula, wherein the separant is prepared by a mechanical grinding and mixing method, and the granularity is less than 100 microns;
step 2, brushing the carbon-protecting release agent on the surface of the normal-temperature high-carbon steel, wherein the thickness of the carbon-protecting release agent is 200-;
step 3, the high-carbon steel obtained in the step 2 enters a heating furnace to be heated to the temperature of 900-1150 ℃, the heating time is 1-10 hours, and the carbon element protection on the high-temperature surface is formed in the heating process;
and 4, obtaining a product after heating is finished.
The high-temperature surface carbon-preserving separant is suitable for protecting medium-high carbon steel when the medium-high carbon steel is heated at the temperature of 900-1150 ℃/1-10 hours, a compact glass isolating layer is formed at high temperature, oxygen atoms are prevented from diffusing to a steel matrix, not only is oxidation burning loss reduced, but also carbon preservation and recarburization of the surface of the steel matrix are realized, the separant automatically falls off after heating is finished, a bright metal matrix is exposed, and the qualified product rate and the high-grade product rate of rolled products are improved. The separant has no special requirement on the spraying environment, and is sprayed at normal temperature.
The first embodiment is as follows:
the high-temperature surface carbon-preserving separant for the high-carbon steel comprises dry powder and water, wherein the dry powder comprises the following raw materials in percentage by weight: 65% of diopside, 3% of nano silicon nitride, 3.5% of nano chromium carbide, 10% of aluminum ash powder, 18% of potash water glass (modulus 3.0) and 0.5% of polyacrylamide, wherein the particle sizes of the nano silicon nitride and the nano chromium carbide are both 200 nm; water is used as a diluent, and the added water accounts for 70 percent of the total weight of the dry powder.
The high-temperature surface carbon-protecting separant for the high-carbon steel is sprayed on the surface of a spring steel 54SiCr6 square billet, the spraying thickness is 200 mu m, the spring steel 54SiCr6 square billet enters a heating furnace and is heated to 1030 ℃ for 3 hours, the surface protection is realized after the treatment, and the depth of a decarburized layer can be reduced by more than 60%.
The second embodiment is as follows:
the high-temperature surface carbon-preserving separant for the high-carbon steel comprises dry powder and water, wherein the dry powder comprises the following raw materials in percentage by weight: 70% of diopside, 2.5% of nano silicon nitride, 4.2% of nano chromium carbide, 13% of aluminum ash powder, 10% of potassium water glass (modulus is 3.0) and 0.3% of polyacrylamide, wherein the particle sizes of the nano silicon nitride and the nano chromium carbide are both 100 nm; water is used as a diluent, and the amount of water added is 80% of the total weight.
The high-temperature surface carbon-protecting separant for high-carbon steel is sprayed on the surface of a low-temperature secondary fire bearing steel GCr15 steel plate blank, the spraying thickness is 300 mu m, the low-temperature secondary fire bearing steel GCr15 steel plate blank enters a heating furnace and is heated to 1180 ℃ for 6 hours, and surface protection is realized after treatment, so that the depth of a decarburized layer can be reduced by more than 60%.
The third concrete embodiment:
the high-temperature surface carbon-preserving separant for the high-carbon steel comprises dry powder and water, wherein the dry powder comprises the following raw materials in percentage by weight: 75% of diopside, 1.9% of nano silicon nitride, 2% of nano chromium carbide, 6% of aluminum ash powder, 15% of potash water glass (modulus 3.0) and 0.1% of polyacrylamide, wherein the particle sizes of the nano silicon nitride and the nano chromium carbide are both 400 nm; water was used as a diluent and the amount of water added was 65% of the total weight.
The high-temperature surface carbon-preserving separant for the high-carbon steel is sprayed on the surface of a spring steel 60Si2Mn square billet, the spraying thickness is 500 mu m, the spring steel 60Si2Mn square billet enters a heating furnace and is heated to 1040 ℃ for 3 hours, and surface protection is realized after treatment, so that the depth of a decarburized layer can be reduced by more than 70%.
The fourth concrete embodiment:
the high-temperature surface carbon-preserving separant for the high-carbon steel comprises dry powder and water, wherein the dry powder comprises the following raw materials in percentage by weight: 82% of diopside, 1.4% of nano silicon nitride, 1.5% of nano chromium carbide, 9% of aluminum ash powder, 6% of potassium water glass (modulus 3.0) and 0.1% of polyacrylamide, wherein the particle sizes of the nano silicon nitride and the nano chromium carbide are both 500 nm; water is used as a diluent, and the amount of water added is 90% of the total weight.
The high-temperature surface carbon-preserving separant for the high-carbon steel is sprayed on the surface of a tool steel M2 square billet, the spraying thickness is 100 mu M, the tool steel M2 square billet enters a heating furnace and is heated to 1150 ℃ for 5.5 hours, and surface protection is realized after treatment, so that the depth of a decarburized layer can be reduced by more than 85%.
The above description is only a few specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by the design concept should fall within the scope of the present invention.
Claims (10)
1. The high-temperature surface carbon-preserving separant for the high-carbon steel is characterized by comprising dry powder and a diluent,
the dry powder comprises the following raw materials in percentage by weight: 60-85% of diopside, 1-5% of nano silicon nitride, 1-5% of nano chromium carbide, 5-15% of aluminum ash powder, 6-25% of potassium water glass (modulus 3.0) and 0.1-0.5% of polyacrylamide;
the diluent is water, and the weight of the water is 60-90% of the total weight of the dry powder.
2. The high-temperature surface carbon-retention separant for high-carbon steel according to claim 1, wherein: the particle sizes of the nano silicon nitride and the nano chromium carbide are both 100-500 nm.
3. The high-temperature surface carbon-preserving separant for the high-carbon steel according to claim 1 or 2, wherein the dry powder comprises the following raw materials in percentage by weight: 65% of diopside, 3% of nano silicon nitride, 3.5% of nano chromium carbide, 10% of aluminum ash powder, 18% of potassium water glass (modulus 3.0) and 0.5% of polyacrylamide.
4. The high-temperature surface carbon-preserving separant for the high-carbon steel according to claim 1 or 2, wherein the dry powder comprises the following raw materials in percentage by weight: 70% of diopside, 2.5% of nano silicon nitride, 4.2% of nano chromium carbide, 13% of aluminum ash powder, 10% of potassium water glass (modulus 3.0) and 0.3% of polyacrylamide.
5. The high-temperature surface carbon-preserving separant for the high-carbon steel according to claim 1 or 2, wherein the dry powder comprises the following raw materials in percentage by weight: 75% of diopside, 1.9% of nano silicon nitride, 2% of nano chromium carbide, 6% of aluminum ash powder, 15% of potash water glass (modulus 3.0) and 0.1% of polyacrylamide.
6. The high-temperature surface carbon-preserving separant for the high-carbon steel according to claim 1 or 2, wherein the dry powder comprises the following raw materials in percentage by weight: 82% of pyroxene, 1.4% of nano silicon nitride, 1.5% of nano chromium carbide, 9% of aluminum ash powder, 6% of potassium water glass (modulus 3.0) and 0.1% of polyacrylamide.
7. A method for protecting carbon on the high-temperature surface of silicon-containing steel, which is characterized by using the high-temperature surface carbon-protecting separant for high-carbon steel according to any one of claims 1 to 7, and comprises the following specific steps:
step 1, preparing a high-temperature surface carbon-preserving separant for high-carbon steel according to a raw material formula;
step 2, brushing the carbon-preserving separant on the surface of the normal-temperature high-carbon steel;
step 3, heating the high-carbon steel obtained in the step 2 in a heating furnace to 900-;
and 4, obtaining a product after heating is finished.
8. The method for protecting carbon on the high-temperature surface of silicon-containing steel as claimed in claim 7, wherein: the separant in the step 1 is prepared by a mechanical grinding and mixing method, and the granularity is less than 100 mu m.
9. The method for protecting carbon on the high-temperature surface of silicon-containing steel as claimed in claim 7, wherein: the thickness of the carbon-retaining release agent in the step 2 is 200-500 μm.
10. The method for protecting carbon on the high-temperature surface of silicon-containing steel as claimed in claim 7, wherein: in the step 3, the heating time of the heating furnace is 1-10 hours.
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| US4582547A (en) * | 1984-05-07 | 1986-04-15 | Allegheny Ludlum Steel Corporation | Method for improving the annealing separator coating on silicon steel and coating therefor |
| US20080233295A1 (en) * | 2007-01-31 | 2008-09-25 | Institute Of Process Engineering, Chinese Academy Of Sciences | Antioxidation coating for steel and antioxidation method using the same |
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| CN107903674A (en) * | 2017-12-08 | 2018-04-13 | 福建省鑫富达铝业有限公司 | Silicon containing steel high temperature surface removes red rust interleaving agent and goes red rust method |
| CN109022723A (en) * | 2018-09-28 | 2018-12-18 | 晋江市钫淦新材料科技有限公司 | A kind of medium and high carbon steel protects the interleaving agent and its application method of carbon with high temperature surface |
| CN109161665A (en) * | 2018-09-28 | 2019-01-08 | 晋江市钫淦新材料科技有限公司 | The interleaving agent and its application method of red rust are removed in a kind of silicon containing steel high temperature surface |
-
2020
- 2020-08-26 CN CN202010870068.0A patent/CN111996344A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4582547A (en) * | 1984-05-07 | 1986-04-15 | Allegheny Ludlum Steel Corporation | Method for improving the annealing separator coating on silicon steel and coating therefor |
| US20080233295A1 (en) * | 2007-01-31 | 2008-09-25 | Institute Of Process Engineering, Chinese Academy Of Sciences | Antioxidation coating for steel and antioxidation method using the same |
| CN103276169A (en) * | 2013-04-26 | 2013-09-04 | 上海钫淦冶金科技有限公司 | Nano-isolation agent for preventing high-temperature surface oxidation of stainless steel |
| CN107903674A (en) * | 2017-12-08 | 2018-04-13 | 福建省鑫富达铝业有限公司 | Silicon containing steel high temperature surface removes red rust interleaving agent and goes red rust method |
| CN109022723A (en) * | 2018-09-28 | 2018-12-18 | 晋江市钫淦新材料科技有限公司 | A kind of medium and high carbon steel protects the interleaving agent and its application method of carbon with high temperature surface |
| CN109161665A (en) * | 2018-09-28 | 2019-01-08 | 晋江市钫淦新材料科技有限公司 | The interleaving agent and its application method of red rust are removed in a kind of silicon containing steel high temperature surface |
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Application publication date: 20201127 |