Electrode steel with high heat conducting capacity and method for producing the same

Abstract

The application discloses electrode steel with high heat conduction capacity and a production method thereof, and the electrode steel comprises the following chemical components in percentage by weight: C 0.001%-0.003%, Si 0.0008%-0.0012%, Mn 0.006%-0.008%, P<=0.005%, S<=0.003%, Cu 3.8%-4.2%, O 0.0004%-0.0008%, and the rest is Fe and other inevitable impurities, and the production method comprises the steps of hot metal desulfurization, converter smelting, LF furnace refining, RH vacuum treatment, billet continuous casting, heating furnace heating, rolling and cooling. The high heat conduction capacity electrode steel provided by the application has a higher heat conduction coefficient, and the surface layer has a higher heat conduction coefficient than the core, which is beneficial to material heat dissipation, can effectively improve the heat dissipation efficiency in the process of electrolytic aluminum, reduces the working temperature and resistance of the electrode steel, and reduces the power consumption in the process of electrolytic aluminum production.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of metallurgy, and particularly relates to an electrode steel with high heat conduction capacity and a production method thereof. BACKGROUND

[0002] Aluminum is a light metal with excellent performance, and is used in the manufacture of various products in large quantities, and the market demand is extremely large. At present, the main method for producing aluminum in industry is electrolytic aluminum method, that is, alumina is used as solute, aluminum liquid is used as cathode, and carbon body is used as anode, and strong current is introduced to carry out electrolysis reaction at high temperature. The electrode steel is used as the conductive material of the cathode in the electrolysis reaction, and in addition to the requirement of low resistivity, it also needs to have high heat conduction capacity, so that the electrode steel can maintain a relatively low temperature, reduce the material resistance (the resistance of metal increases with the increase of temperature), and reduce the production power consumption. The electrolytic aluminum enterprise is a large power consumer, and the heat conduction capacity of the electrode steel can be improved from the material aspect, so as to reduce the power consumption, reduce the production cost, and save energy. At present, the electrode steel commonly used for the cathode in the electrolytic aluminum method in China is Q195 steel, which is easy to obtain and has low cost, but the heat conduction capacity restricts its further development.

[0003] In view of the problem of poor heat conduction performance of the electrode steel used in the electrolytic aluminum enterprise, it is urgent to provide an electrode steel with high heat conduction coefficient, so that the electrode steel can maintain a relatively low temperature in the electrolytic aluminum process, reduce the material resistance, and reduce the power consumption of the electrolytic aluminum enterprise. SUMMARY

[0004] In order to overcome the defects of the prior art, the present application provides an electrode steel with high heat conduction capacity and a production method thereof, which solves the problem of poor heat conduction performance of the electrode steel, effectively improves the heat dissipation efficiency in the electrolytic aluminum process, reduces the working temperature and resistance of the electrode steel, and reduces the power consumption in the electrolytic aluminum production process.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] An electrode steel with high heat conduction capacity comprises the following chemical components in percentage by weight: C 0.001% to 0.003%, Si 0.0008% to 0.0012%, Mn 0.006% to 0.008%, P≤0.005%, S≤0.003%, Cu 3.8% to 4.2%, O 0.0004% to 0.0008%, and the rest is Fe and other inevitable impurities.

[0007] Preferably, the electrode steel with high thermal conductivity comprises the following chemical components in percentage by weight: C 0.002%, Si 0.001%, Mn 0.007%, P≤0.005%, S≤0.003%, Cu 4.0%, O 0.0006%, and the rest is Fe and other inevitable impurities.

[0008] The production method of the electrode steel with high thermal conductivity comprises the following steps: hot metal desulphurization, converter smelting, LF furnace refining, RH vacuum treatment, billet continuous casting, heating furnace heating, rolling and cooling.

[0009] The converter smelting step adopts a 2-time slagging process, and copper material is fed during tapping.

[0010] In the LF furnace refining step, the slag basicity is controlled to be 3.3-3.8, the LF furnace treatment time is≥25 min, and the off-site temperature is 1670-1690℃.

[0011] The RH vacuum treatment time is≥20 min, and the pressure is≤100 Pa vacuum degree.

[0012] In the billet continuous casting step, the tundish temperature is controlled to be 1540-1560℃, the casting billet pulling speed is controlled to be 0.5-0.7 m / min, and the casting billet section size is 280 mm*380 mm.

[0013] In the heating furnace heating step, the casting billet heating temperature is controlled to be 830-850℃, and the heating time is 200-240 min.

[0014] The rolling step comprises rough rolling and finish rolling.

[0015] After rolling, natural cooling is carried out on the cooling bed.

[0016] Preferably, in the converter smelting step, the converter smelting time is 35-40 min, and the tapping temperature is controlled to be 1600-1610℃.

[0017] Preferably, in the RH vacuum treatment step, the off-site oxygen content is 0.0005-0.0008%.

[0018] Preferably, in the continuous casting step, large pot long nozzle and crystallizer immersion nozzle protection pouring are adopted, the immersion depth is 80-90 mm, and the tundish molten steel superheat is controlled to be 20-40℃.

[0019] Preferably, in the rolling step, the rough rolling opening temperature is 770-790℃, and the finish rolling final rolling temperature is 650-670℃.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] (1) The present application greatly reduces the content of C, Si and Mn in the electrode steel by combining component design with steelmaking process, improves the purity of the electrode steel, simultaneously uses ultra-low oxygen process to reduce the defects such as oxide and micro-pore in the electrode steel, and effectively improves the heat conduction efficiency of the electrode steel. Compared with the ordinary Q195 steel, the heat conduction coefficient of the electrode steel at the surface layer at different temperatures can be increased by 35% to 90%.

[0022] (2) The present application avoids high-temperature austenite zone and performs low-temperature ferrite zone rolling through rolling temperature control, the electrode steel obtained by the method has small surface layer grains and large core grains. The Cu element added in the electrode steel is precipitated from the grain boundary, and the Cu element can effectively improve the heat conduction capacity of the grain boundary phase interface, thereby improving the heat conduction rate of the material. Since the surface layer of the electrode steel has more grain boundaries, more Cu elements will gather in the surface layer and the near-surface layer region, so that the heat conduction capacity of the surface layer region of the electrode steel is stronger, which is beneficial to the faster heat transfer from the high-temperature region in the core to the surface layer for dissipation, thereby improving the overall heat dissipation capacity of the material.

[0023] (3) The electrode steel of the present application can be rolled into a rectangular section with a height-width ratio of 1:1 to 1:5, which increases the effective heat dissipation surface area under the same volume, improves the heat dissipation capacity of the steel, and can be customized according to the actual situation of the user equipment.

[0024] In summary, the high-heat-conductivity electrode steel of the present application contains Cu element with good heat conduction performance and extremely low content of C, Si and Mn elements, has a high heat conduction coefficient, and the surface layer has a higher heat conduction coefficient than the core, which is more conducive to heat dissipation of the material, can effectively improve the heat dissipation efficiency in the electrolytic aluminum process, reduce the working temperature and resistance of the electrode steel, and reduce the power consumption in the electrolytic aluminum production process. DETAILED DESCRIPTION

[0025] In order to better explain the present application, the main content of the present application is further illustrated below in combination with specific embodiments, but the content of the present application is not limited to the following embodiments.

[0026] The present application provides a high-heat-conductivity electrode steel, which comprises the following chemical components in percentage by weight: C 0.001% to 0.003%, Si 0.0008% to 0.0012%, Mn 0.006% to 0.008%, P≤0.005%, S≤0.003%, Cu 3.8% to 4.2%, O 0.0004% to 0.0008%, and the rest is Fe and other unavoidable impurities. The electrode steel contains Cu element with good heat conduction performance and extremely low content of C, Si and Mn elements, which greatly improves the heat conduction performance.

[0027] Further preferably, the electrode steel with high thermal conductivity comprises the following chemical components in percentage by weight: C 0.002%, Si 0.001%, Mn 0.007%, P≤0.005%, S≤0.003%, Cu 4.0%, O 0.0006%, and the rest is Fe and other inevitable impurities.

[0028] The application also provides a production method of the electrode steel with high thermal conductivity, comprising the following steps: hot metal desulphurization, converter smelting, LF furnace refining, RH vacuum treatment, billet continuous casting, heating furnace heating, rolling and cooling.

[0029] The converter smelting step adopts a 2-time slagging process, and copper material is fed during tapping; in the LF furnace refining step, the slag basicity is controlled to be 3.3-3.8, the LF furnace treatment time is≥25 min, and the off-site temperature is 1670-1690℃; the RH vacuum treatment time is≥20 min, and the pressure is≤100 Pa vacuum degree; in the billet continuous casting step, the tundish temperature is controlled to be 1540-1560℃, the casting billet pulling speed is controlled to be 0.5-0.7 m / min, and the casting billet section size is 280 mm×380 mm; in the heating furnace heating step, the casting billet heating temperature is controlled to be 830-850℃, and the heating time is 200-240 min; the rolling step includes rough rolling and finish rolling; and natural cooling is performed on the rolling mill after rolling.

[0030] Further preferably, in the converter smelting step, the converter smelting time is 35-40 min, and the tapping temperature is controlled to be 1600-1610℃.

[0031] Further preferably, in the RH vacuum treatment step, the off-site oxygen content is 0.0005%-0.0008%.

[0032] Further preferably, in the continuous casting step, large pot long nozzle and crystallizer immersion nozzle protection pouring are adopted, the immersion depth is 80-90 mm, and the tundish molten steel superheat is controlled to be 20-40℃.

[0033] Further preferably, in the rolling step, the rough rolling opening temperature is 770-790℃, and the finish rolling final rolling temperature is 650-670℃.

[0034] Example 1

[0035] An electrode steel with high thermal conductivity comprises the following chemical components in percentage by weight: C 0.002%, Si 0.001%, Mn 0.007%, P 0.003%, S 0.0015%, Cu 4.0%, O 0.0006%, and the rest is Fe and other inevitable impurities. The production process of the electrode steel is as follows:

[0036] (1) The molten iron is added with desulfurizer for desulfurization, and then converter smelting is performed. The converter smelting time is 37 min, the 2-time slagging process is adopted, the tapping temperature is controlled at 1606℃, and the copper material is fed at 1 / 4 of the tapping time;

[0037] (2) The active lime is added for slagging, the slag basicity is controlled at 3.5, the LF furnace treatment time is 30 min, and the leaving station temperature is 1682℃;

[0038] (3) The RH vacuum treatment time is 23 min, the deep vacuum degree pressure is 55 Pa, and the leaving station oxygen content is 0.0006%;

[0039] (4) The large ladle long nozzle and the crystallizer immersed nozzle protection pouring are adopted, the immersion depth is 87 mm, the tundish temperature is controlled at 1550℃, the superheat degree is 25℃, the cast slab drawing speed is controlled at 0.6 m / min, and the cast slab section size is 280 mm x 380 mm;

[0040] (5) The cast slab is stacked and naturally slow-cooled to room temperature;

[0041] (6) The cast slab is heated in the heating furnace, the heating temperature is controlled at 840℃, and the heating time is 220 min;

[0042] (7) The rough rolling of the rolling mill is performed, and the opening rolling temperature is 780℃;

[0043] (8) The finishing rolling of the rolling mill is performed, and the final rolling temperature is 660℃;

[0044] (9) The air cooling to room temperature is performed after rolling.

[0045] Example 2

[0046] The electrode steel with high heat conduction capacity provided by the application comprises the following chemical components in percentage by weight: C 0.0013%, Si 0.0009%, Mn 0.0065%, P 0.0028%, S 0.0024%, Cu 3.83%, O 0.0008%, and the rest is Fe and other inevitable impurities. The production process of the electrode steel is as follows:

[0047] (1) The molten iron is added with desulfurizer for desulfurization, and then converter smelting is performed. The converter smelting time is 36 min, the 2-time slagging process is adopted, the tapping temperature is controlled at 1609℃, and the copper material is fed at 1 / 4 of the tapping time;

[0048] (2) The active lime is added for slagging, the slag basicity is controlled at 3.7, the LF furnace treatment time is 26 min, and the leaving station temperature is 1675℃;

[0049] (3) RH vacuum treatment time 20 min, deep vacuum degree pressure is 52 Pa, off-site oxygen content 0.0008%;

[0050] (4) Adopting large ladle long nozzle and crystallizer submerged entry nozzle protection pouring, the immersion depth is 83 mm, the tundish temperature is controlled at 1560℃, the superheat is 30℃, the casting blank drawing speed is controlled at 0.5 m / min, the casting blank section size is 280 mm*380 mm;

[0051] (5) The casting blank is naturally slow cooled to room temperature in stacking;

[0052] (6) The casting blank is heated in a heating furnace, the heating temperature is controlled at 850℃, and the heating time is 210 min;

[0053] (7) Rough rolling of the rolling mill, the opening rolling temperature is 788℃;

[0054] (8) Finish rolling of the rolling mill, the final rolling temperature is 667℃;

[0055] (9) Air cooling to room temperature on the cooling bed after rolling.

[0056] Example 3

[0057] The electrode steel with high heat conduction capacity provided by the application comprises the following chemical components in percentage by weight: C 0.0026%, Si 0.0012%, Mn 0.008%, P 0.002%, S 0.0012%, Cu 4.17%, O 0.0005%, and the rest is Fe and other inevitable impurities. The production process of the electrode steel is as follows:

[0058] (1) The molten iron is added with desulfurizer for desulfurization, and then converter smelting is carried out. The converter smelting time is 38 min, the 2-time slagging process is adopted, the tapping temperature is controlled at 1601℃, and the copper material is fed at 1 / 4 of the tapping time;

[0059] (2) Active lime is added for slagging, the slag basicity is controlled at 3.4, the LF furnace treatment time is 32 min, and the off-site temperature is 1684℃;

[0060] (3) RH vacuum treatment time 25 min, deep vacuum degree pressure is 56 Pa, off-site oxygen content 0.0006%;

[0061] (4) Adopting large ladle long nozzle and crystallizer submerged entry nozzle protection pouring, the immersion depth is 89 mm, the tundish temperature is controlled at 1545℃, the superheat is 31℃, the casting blank drawing speed is controlled at 0.5 m / min, the casting blank section size is 280 mm*380 mm;

[0062] (5) The casting blank is naturally slow cooled to room temperature in stacking;

[0063] (6) The casting blank is heated in a heating furnace, the heating temperature is controlled at 835°C, and the heating time is 210 min;

[0064] (7) Rough rolling in a rolling mill, the rough rolling temperature is 772°C;

[0065] (8) Finish rolling in a rolling mill, the finish rolling temperature is 656°C;

[0066] (9) Air cooling to room temperature on a cooling bed after rolling.

[0067] Performance test

[0068] The high-thermal-conductivity electrode steel obtained in Examples 1-3 is compared with ordinary Q195 steel (the composition of which is: C 0.14%, Si 0.25%, Mn 0.46%, P 0.010%, S 0.004%, and the rest is Fe and other inevitable impurities) in performance, and the thermal conductivities of different parts and at different temperatures are shown in Table 1.

[0069] Table 1 Comparison table of thermal conductivities

[0070]

[0071] As shown in Table 1, the high-thermal-conductivity electrode steel according to the present embodiment has a surface thermal conductivity 8%-18% higher than the core thermal conductivity at different temperatures, which improves the overall heat dissipation capacity of the material. Compared with ordinary Q195 steel, the surface thermal conductivity of the high-thermal-conductivity electrode steel can be improved by 35%-90% at different temperatures, which greatly improves the thermal conductivity of the material.

[0072] The other parts not described belong to the prior art.

Claims

1. A method for producing an electrode steel having a high heat conductivity, characterized in that: It comprises the following steps: hot metal desulphurization, converter smelting, LF refining, RH vacuum treatment, billet continuous casting, heating furnace heating, rolling and cooling; The electrode steel comprises the following chemical components in percentage by weight: C 0.001%-0.003%, Si 0.0008%-0.0012%, Mn 0.006%-0.008%, P≤0.005%, S≤0.003%, Cu 3.8%-4.2%, O 0.0004%-0.0008%, the rest being Fe and other inevitable impurities; The converter smelting step adopts a 2-time slagging process, and copper material is fed during tapping; In the LF refining step, the slag basicity is controlled to be 3.3-3.8, the LF furnace treatment time is ≥25 min, and the off-site temperature is 1670-1690℃; The RH vacuum treatment time is ≥20 min, the pressure is ≤100 Pa vacuum degree; the off-site oxygen content is 0.0005%-0.0008%; In the billet continuous casting step, the tundish temperature is controlled to be 1540-1560℃, the casting billet speed is controlled to be 0.5-0.7 m / min, and the casting billet section size is 280 mm×380 mm; In the heating furnace heating step, the casting billet heating temperature is controlled to be 830-850℃, and the heating time is 200-240 min; The rolling step comprises rough rolling and finish rolling; the rough rolling opening temperature is 770-790℃; the finish rolling final rolling temperature is 650-670℃; After rolling, natural cooling is carried out on the cooling bed.

2. The method of producing electrode steel having high heat conductivity according to claim 1, characterized in that: The electrode steel comprises the following chemical components in percentage by weight: C 0.002%, Si 0.001%, Mn 0.007%, P≤0.005%, S≤0.003%, Cu 4.0%, O 0.0006%, the rest being Fe and other inevitable impurities.

3. The method of producing electrode steel having high heat conductivity according to claim 1, characterized in that: The converter smelting step, the converter smelting time is 35-40 min, and the tapping temperature is controlled to be 1600-1610℃.

4. The method of producing electrode steel having high heat conductivity according to claim 1, characterized in that: In the continuous casting step, large pot long nozzle and crystallizer immersion nozzle protection pouring are adopted, the immersion depth is 80-90 mm; the tundish molten steel superheat is controlled to be 20-40℃.

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