High-temperature-resistant and high-conductivity steel for electrolytic aluminum anode steel claw and preparation method

Abstract

The invention provides steel for a high-temperature-resistant and high-conductivity electrolytic aluminum anode steel claw and a preparation method, and relates to the technical field of steel materials for production in the electrolytic aluminum industry. Trace alloy elements are added, the alloy elements and the proportion of the alloy elements are controlled, a corresponding preparation technology is combined, the solid solution and precipitation amount is controlled, and the novel steel for the electrolytic aluminum anode steel claw with the room-temperature performance, the high-temperature performance and the high conductivity is obtained. The high-temperature-resistant and high-conductivity steel for the electrolytic aluminum anode steel claw is prepared by regulating and controlling the (Ti + Mo) / C ratio, adding the Cu element, selecting low-cost raw materials, carrying out soaking section heat preservation treatment before hot rolling and carrying out rolling reduction stage control in the hot rolling process; the method is simple and easy to operate, environmentally friendly, low in cost, short in process, high in efficiency, wide in application range and beneficial to industrial large-scale production and popularization.

Description

Technical Field

[0001] The present invention relates to the technical field of steel materials for production in the electrolytic aluminum industry, and in particular to a high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws and a preparation method thereof. Background Art

[0002] The steel claw of electrolytic aluminum anode is a key component used to fix the anode in the electrolytic aluminum production process. Its main function is to fix the anode in the electrolytic cell and withstand the strong mechanical force and electrochemical corrosion environment from the anode. In modern aluminum electrolytic production, the performance of the steel claw directly affects the operating efficiency and safety of the electrolytic cell. With the continuous increase in the output of electrolytic aluminum and the expansion of production scale, the requirements for anode steel claws are also increasing.

[0003] Traditional anode steel claws are easily affected by high temperature, high current density and strong electrochemical corrosion during use, resulting in wear, fatigue damage and even breakage of the steel claws. This not only affects production efficiency and leads to frequent replacement of steel claws, but also may bring safety hazards. Therefore, it is particularly necessary to develop anode steel claw steel with higher corrosion resistance, high temperature resistance and stronger mechanical strength.

[0004] Chinese patent CN109338228A discloses a high-conductivity steel for anode steel claw and its preparation method, which is prepared by smelting, casting, rough rolling, and fine rolling. The content of ferrite structure in the steel is not less than 90%, the content of pearlite structure is not more than 10%, and the average grain size of the steel is greater than or equal to 20μm and less than or equal to 200μm. Obviously, it is necessary to strictly control the proportion of the organization, the alloy elements need to meet specific conditions, and the room temperature mechanical properties and conductivity are regulated by the organization, but there are certain application limitations, and the high temperature environment during the use of the anode steel claw is not considered to easily cause a decrease in strength.

[0005] Chinese patent CN116219283A discloses a steel for electrolytic aluminum anode steel claws and a production method thereof, wherein the smelting process, heating process and rolling process thereof are relatively complicated and difficult to operate, and the prepared hot-rolled round steel and hot-rolled flat steel have relatively low yield strength, low strength-plasticity product and relatively poor plasticity; in particular, although the excessively high carbon content in the composition thereof can improve the tensile strength, it will reduce the machinability of the material, and the material is prone to breakage or cracks during the processing process, and the impact resistance is also poor.

[0006] Chinese patent CN106521557A discloses an anode steel claw for electrolytic aluminum, whose low carbon content makes the material low in strength, and too low copper content makes the conductivity poor. The prepared material is directly cast without rolling treatment, so the surface of the material is rough. Although the resistivity can be reduced by heat treatment, the resistivity of the anode steel claw is still above 12μΩ·cm, and the conductivity is not ideal.

[0007] Chinese patent CN119286288A discloses a highly conductive, high-temperature, anti-oxidation and life-extending coating for electrolytic aluminum anodes, as well as a preparation method and application thereof. It is obvious that the coating is prepared on the surface of the electrolytic aluminum anode to improve the mechanical properties, conductive properties and high-temperature resistance, but it will increase the raw material cost and preparation cost, and the uneven coating will lead to unstable corrosion resistance and conductive properties, especially in high temperature environments. Summary of the invention

[0008] In order to solve the technical problems existing in the anode steel claws for electrolytic aluminum in the prior art: 1) The chemical composition of steel is sensitive to performance requirements, and there are many types of added elements, including the addition of high-cost alloying elements, which leads to high production costs; 2) Low strength due to low carbon content, low electrical conductivity due to the addition of alloying elements, and low corrosion resistance due to the uneven oxide film layer, all of which result in a short service life of the steel claws; 3) High-temperature mechanical properties, corrosion resistance, electrical conductivity and their stability are not fully considered; 4) Although the preparation of the surface coating can improve the overall performance, the selection of the coating composition will increase the cost of raw materials, and different preparation processes will make the coating uneven and have poor adhesion, etc. The present invention proposes a high-temperature resistant and highly conductive electrolytic aluminum anode steel claw steel and a preparation method that can solve the aforementioned problems. The technical scheme is as follows:

[0009] A high temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws, wherein the chemical composition of the high temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws is as follows by mass percentage: C 0.01-0.04%, Ti 0.06-0.09%, Cu 0.2-0.3%, Mo0.01-0.1%, Si≤0.011%, Mn≤0.030%, Cr≤0.025%, Ni≤0.011%, Al≤0.015%, P≤0.007%, S≤0.006%, and the rest are Fe and inevitable trace chemical elements; wherein (Ti+Mo) / C is 3-6.

[0010] Optionally, the microstructure of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel is 93-99% by volume of ferrite and no more than 7% by volume of pearlite, and also has an overall volume fraction of 0.2-0.4% of (Ti, Mo) C and Cu precipitation.

[0011] Optionally, the ferrite of the high temperature resistant and high conductivity electrolytic aluminum anode steel claw steel is equiaxed in shape, with an average grain size of 10-50 μm; the pearlite is lamellar in shape, with an average grain size of 5-20 μm; (Ti, Mo) C and Cu are spherical in shape, with an average particle size not higher than 30 nm.

[0012] Optionally, the room temperature properties of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel are as follows: tensile strength not less than 330 MPa, yield strength not less than 235 MPa, elongation after break not less than 35%, and resistivity not higher than 13 μΩ·cm; the high temperature properties at 400°C are as follows: tensile strength not less than 270 MPa, yield strength not less than 180 MPa, and resistivity not higher than 14 μΩ·cm.

[0013] A method for preparing high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel based on claim 1, the method for preparing high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel comprising the following steps:

[0014] S1. Weighing raw materials: proportioning the raw materials according to the chemical composition content of the steel for the high temperature resistant and high conductivity electrolytic aluminum anode steel claw, and then weighing each raw material to obtain weighed raw materials;

[0015] S2, smelting and continuous casting: smelting the raw materials weighed in S1, and then continuously casting to obtain a continuous casting billet;

[0016] S3, homogenization heat treatment: heating the ingot formed by continuous casting in S2 to the temperature of the soaking section and keeping it warm to obtain a continuous casting ingot with uniform microstructure before hot rolling;

[0017] S4, hot rolling: hot rolling the continuous casting billet with uniform structure before S3 hot rolling, air cooling to room temperature after rolling, and obtaining high temperature resistant and high conductivity electrolytic aluminum anode steel claw steel.

[0018] Optionally, the raw materials of S1 include scrap steel, miscellaneous steel and master alloy.

[0019] Optionally, the S2 melting temperature is 1600-1650°C, the continuous casting temperature is 1500-1550°C, and the ingot size is 200mm×200mm×6000mm.

[0020] Optionally, the temperature of the S3 soaking section is 950-1050°C, the heating rate is 5-10°C / min, and the insulation time is ≥120min, which ensures uniform heating of the material while shortening the heating time and improving production efficiency.

[0021] Optionally, the starting rolling temperature of S4 hot rolling is controlled at 840-900°C, and the final rolling temperature is controlled at 720-780°C.

[0022] The technical principle of selecting the chemical composition content of the present invention is:

[0023] The following is a detailed analysis and explanation of the functions and selection ranges of the components contained in the steel for the electrolytic aluminum steel claw of the present invention.

[0024] C: Carbon is the main strengthening element in steel. When C dissolves in Fe to form a solid solution, the strength and hardness of the steel are significantly improved. In addition, the C element makes the austenite grains more stable at high temperatures and less likely to grow. Therefore, a finer martensite structure can be obtained during quenching, thereby improving the hardenability of the steel. However, too high a C content will reduce the plasticity, toughness and weldability of the steel. In the present invention, the weight percentage of C is controlled to 0.01-0.03%.

[0025] Ti: Titanium is a strong carbide-forming element. It combines with carbon in steel to form a stable dispersed distribution of TiC particles, thereby improving the strength and plasticity of the steel. The interaction between titanium atoms and iron atoms helps to conduct heat energy and thus improve thermal conductivity. Titanium also helps to form a dense oxide film and reduce the formation of easily corrosive phases. The weight percentage of Ti in the present invention is controlled to 0.06-0.09%.

[0026] Cu: Copper is a good conductive element, and its conductivity is second only to silver. Copper has a high thermal expansion coefficient, and adding it to steel can increase its thermal expansion coefficient. Copper can significantly improve the corrosion resistance of steel and form a dense oxide film on the surface of steel. In addition, copper can also inhibit local corrosion of steel, such as pitting and crevice corrosion. This is because the presence of copper can change the electrochemical properties of steel and make the corrosion current distribution more uniform. The present invention controls the weight percentage of Cu to 0.08-0.018%.

[0027] Mo: Molybdenum has excellent high temperature resistance and can significantly improve the strength and hardness of steel in high temperature environments. Molybdenum can inhibit the growth of grains in steel and form a finer grain structure, thereby improving the high temperature strength of steel. Molybdenum can enhance the tolerance of steel to acidic environments and corrosive media, especially in oxidizing media. It can effectively inhibit the oxidation of iron in steel and reduce intergranular corrosion. The present invention controls the weight percentage of Mo to 0.01-0.1%.

[0028] P, S: Phosphorus and sulfur are harmful impurity elements that are difficult to avoid in steel. P atoms will enter the grain boundaries of steel and destroy the strength of the grain boundaries, causing the steel to easily fracture brittlely when subjected to force or impact, especially when used under low temperature conditions, affecting the service life and reliability of the mold; S combines with the iron in the steel to form iron sulfide, which will be distributed along the grain boundaries, causing the toughness and plasticity of the steel to drop significantly. Therefore, the P and S contents in steel should be strictly limited. The present invention controls the weight percentage of the P element to ≤0.010%, and the weight percentage of the sulfur element to ≤0.005%.

[0029] In the organizational structure, the volume proportion of ferrite + the volume proportion of pearlite = 100%, and the volume proportion of the precipitated phase is counted separately.

[0030] Compared with the prior art, the above technical solution has at least the following beneficial effects:

[0031] The above scheme, the present invention proposes a high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws and a preparation method, which can solve the technical problems existing in the prior art electrolytic aluminum anode steel claws: 1) The chemical composition of steel is sensitive to performance requirements, and there are many types of added elements, including the addition of high-cost alloy elements, which leads to high production costs; 2) The low strength caused by low carbon content, the low electrical conductivity caused by the addition of alloy elements, and the low corrosion resistance caused by the uneven oxide film layer, all of which result in a short service life of the steel claws; 3) High-temperature mechanical properties, corrosion resistance, conductivity and their stability are not fully considered; 4) Although the preparation of the surface coating can improve the overall performance, the selection of the coating composition will increase the raw material cost, and different preparation processes will make the coating uneven and have poor adhesion.

[0032] The present invention forms a dense oxide film on the steel surface through the synergistic effect of Cu and Mo, which significantly improves the corrosion resistance of the steel, thereby extending the service time of the steel claw in the electrolytic aluminum tank and reducing maintenance costs.

[0033] The present invention controls the amount and size of precipitates by adjusting the (Ti+Mo) / C ratio and adding the Cu element, thereby reducing the amount of solid-solution C in the matrix, reducing the scattering of electrons, and increasing the electrical conductivity. Meanwhile, the precipitation of (Ti, Mo)C and Cu improves the room temperature and high temperature strength of the steel of the present invention.

[0034] The present invention selects low-cost raw materials, performs heat preservation treatment in a soaking section before hot rolling, and controls the rolling reduction during the hot rolling process, so that the prepared material can synergistically improve the room temperature mechanical properties, room temperature corrosion resistance and room temperature electrical conductivity, as well as the high temperature mechanical properties, high temperature corrosion resistance and high temperature electrical conductivity and its high temperature stability without the need for surface coating.

[0035] The room temperature properties of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared by the present invention are as follows: tensile strength is not less than 330 MPa, yield strength is not less than 235 MPa, elongation after fracture is not less than 35%, and resistivity is not higher than 13 μΩ·cm; the high temperature properties at 400°C are as follows: tensile strength is not less than 270 MPa, yield strength is not less than 180 MPa, and resistivity is not higher than 14 μΩ·cm.

[0036] In summary, compared with other traditional methods, the method of the present invention prepares high-temperature resistant and highly conductive electrolytic aluminum anode steel claw steel by adjusting the (Ti+Mo) / C ratio and adding Cu elements, selecting low-cost raw materials and heat preservation treatment in the soaking section before hot rolling, and controlling the rolling reduction amount in the hot rolling process; the method is simple and easy to operate, green and environmentally friendly, low in cost, short in process, high in efficiency, wide in application range, and conducive to large-scale industrial production and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 This is a microstructure diagram of a high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel according to Example 1 of the present invention;

[0039] Figure 2 This is a microstructure diagram of a high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel according to Example 2 of the present invention;

[0040] Figure 3 This is a microstructure diagram of a high temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws according to Example 3 of the present invention. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is described below in conjunction with the accompanying drawings.

[0042] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "example" is intended to present the concept in a specific way. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or it can be either of the two.

[0043] In the embodiments of the present invention, "image" and "picture" may sometimes be used interchangeably. It should be noted that when the distinction between them is not emphasized, the meanings they intend to express are consistent.

[0044] In the embodiments of the present invention, sometimes a subscript such as W1 may be written as a non-subscript such as W1. When the difference is not emphasized, the meanings to be expressed are the same.

[0045] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0046] A high temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws, wherein the chemical composition of the high temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws is as follows by mass percentage: C 0.01-0.04%, Ti 0.06-0.09%, Cu 0.2-0.3%, Mo0.01-0.1%, Si≤0.011%, Mn≤0.030%, Cr≤0.025%, Ni≤0.011%, Al≤0.015%, P≤0.007%, S≤0.006%, and the rest are Fe and inevitable trace chemical elements; wherein (Ti+Mo) / C is 3-6.

[0047] In particular, the microstructure of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel is 93-99% by volume of ferrite and no more than 7% by volume of pearlite, and also contains 0.2-0.4% by volume of (Ti, Mo) C and Cu precipitation.

[0048] In particular, the ferrite of the high temperature resistant and high conductivity electrolytic aluminum anode steel claw steel is equiaxed in shape, with an average grain size of 10-50 μm; the pearlite is lamellar in shape, with an average grain size of 5-20 μm; (Ti, Mo) C and Cu are spherical in shape, with an average particle size not higher than 30 nm.

[0049] In particular, the room temperature properties of the high-temperature resistant and high-conductivity electrolytic aluminum anode steel claw steel are as follows: tensile strength not less than 330MPa, yield strength not less than 235MPa, elongation after break not less than 35%, and resistivity not higher than 13μΩ·cm; the high temperature properties at 400°C are as follows: tensile strength not less than 270MPa, yield strength not less than 180MPa, and resistivity not higher than 14μΩ·cm.

[0050] A method for preparing high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel based on claim 1, the method for preparing high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel comprising the following steps:

[0051] S1. Weighing raw materials: proportioning the raw materials according to the chemical composition content of the steel for the high temperature resistant and high conductivity electrolytic aluminum anode steel claw, and then weighing each raw material to obtain weighed raw materials;

[0052] S2, smelting and continuous casting: smelting the raw materials weighed in S1, and then continuously casting to obtain a continuous casting billet;

[0053] S3, homogenization heat treatment: heating the ingot formed by continuous casting in S2 to the temperature of the soaking section and keeping it warm to obtain a continuous casting ingot with uniform microstructure before hot rolling;

[0054] S4, hot rolling: hot rolling the continuous casting billet with uniform structure before S3 hot rolling, air cooling to room temperature after rolling, and obtaining high temperature resistant and high conductivity electrolytic aluminum anode steel claw steel.

[0055] In particular, the S1 raw materials include scrap steel, miscellaneous steel and master alloy.

[0056] In particular, the S2 melting temperature is 1600-1650°C, the continuous casting temperature is 1500-1550°C, and the ingot size is 200mm×200mm×6000mm.

[0057] In particular, the temperature of the S3 soaking section is 950-1050°C, the heating rate is 5-10°C / min, and the insulation time is ≥120min, which ensures uniform heating of the material while shortening the heating time and improving production efficiency.

[0058] In particular, the starting rolling temperature of S4 hot rolling is controlled at 840-900°C, and the final rolling temperature is controlled at 720-780°C.

[0059] Example 1

[0060] A high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws, wherein the chemical composition of the high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws is as follows by mass percentage: C 0.024%, Ti 0.08%, Cu 0.23%, Mo 0.05%, Si 0.008%, Mn 0.015%, Cr 0.020%, Ni≤0.011%, Al≤0.015%, P≤0.007%, S≤0.006%, and the rest is Fe and inevitable trace chemical elements; wherein, (Ti+Mo) / C is approximately 5.417.

[0061] A method for preparing the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel based on the above method comprises the following steps:

[0062] S1. Weighing raw materials: The raw materials are proportioned according to the chemical composition content of the steel for the high temperature resistant and high conductivity electrolytic aluminum anode steel claw, and then each raw material is weighed, and each raw material includes scrap steel, miscellaneous steel and intermediate alloy to obtain weighed raw materials;

[0063] S2, smelting and continuous casting: the raw materials weighed in S1 are smelted at a smelting temperature of 1600-1650°C, and then continuously cast at a continuous casting temperature of 1500-1550°C to obtain a continuously cast ingot; the ingot size is 200mm×200mm×6000mm;

[0064] S3, homogenization heat treatment: the ingot formed by continuous casting in S2 is heated to the temperature of the soaking section and kept warm, the soaking section temperature is 1000°C, the holding time is 2.5h, and the continuous casting ingot with uniform microstructure before hot rolling is obtained;

[0065] S4, hot rolling: hot rolling is performed on the continuous casting billet with uniform organizational structure before S3 hot rolling. The starting rolling temperature of hot rolling is controlled at 860°C, the final rolling temperature is controlled at 770°C, and air-cooling is performed to room temperature after rolling to obtain high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel.

[0066] The microstructure of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment is 96.3% by volume of ferrite and 3.7% by volume of pearlite, and also contains 0.26% by volume of (Ti, Mo) C and Cu precipitation.

[0067] like Figure 1 As shown, the ferrite of the high temperature resistant and high conductivity electrolytic aluminum anode steel claw steel prepared in this embodiment has an equiaxed shape and an average grain size of 35 μm; the pearlite has a lamellar shape and an average grain size of 9.4 μm; the (Ti, Mo) C and Cu have a spherical shape and an average particle size of 16 nm.

[0068] The room temperature properties of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment are as follows: tensile strength is 342 MPa, yield strength is 248 MPa, yield strength ratio is 0.725, elongation after fracture is 44%, and resistivity is 12.4 μΩ·cm; the high temperature performance at 400°C is as follows: tensile strength is 292 MPa, yield strength is 197 MPa, yield strength ratio is 0.675, and resistivity is 13.6 μΩ·cm.

[0069] Example 2

[0070] A high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws, wherein the chemical composition of the high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws is as follows by mass percentage: C 0.020%, Ti 0.06%, Cu 0.24%, Mo 0.04%, Si 0.009%, Mn 0.024%, Cr 0.021%, Ni≤0.011%, Al≤0.015%, P≤0.007%, S≤0.006%, and the rest is Fe and inevitable trace chemical elements; wherein, (Ti+Mo) / C is approximately 5.

[0071] A method for preparing the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel based on the above method comprises the following steps:

[0072] S1. Weighing raw materials: The raw materials are proportioned according to the chemical composition content of the steel for the high temperature resistant and high conductivity electrolytic aluminum anode steel claw, and then each raw material is weighed, and each raw material includes scrap steel, miscellaneous steel and intermediate alloy to obtain weighed raw materials;

[0073] S2, smelting and continuous casting: the raw materials weighed in S1 are smelted at a smelting temperature of 1600-1650°C, and then continuously cast at a continuous casting temperature of 1500-1550°C to obtain a continuously cast ingot; the ingot size is 200mm×200mm×6000mm;

[0074] S3, homogenization heat treatment: the ingot formed by continuous casting in S2 is heated to the temperature of the soaking section and kept warm, the soaking section temperature is 980°C, the holding time is 2.5h, and the continuous casting ingot with uniform microstructure before hot rolling is obtained;

[0075] S4, hot rolling: hot rolling is performed on the continuous casting billet with uniform organizational structure before S3 hot rolling. The starting rolling temperature of hot rolling is controlled at 865°C, the final rolling temperature is controlled at 750°C, and the steel is air-cooled to room temperature after rolling to obtain high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel.

[0076] The microstructure of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment is 95.9% by volume of ferrite and 4.1% by volume of pearlite, and also contains 0.21% by volume of (Ti, Mo) C and Cu precipitation.

[0077] like Figure 2 As shown, the ferrite of the high temperature resistant and high conductivity electrolytic aluminum anode steel claw steel prepared in this embodiment has an equiaxed shape and an average grain size of 41 μm; the pearlite has a lamellar shape and an average grain size of 6.0 μm; the (Ti, Mo) C and Cu have a spherical shape and an average particle size of 19 nm.

[0078] The room temperature properties of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment are as follows: tensile strength is 364 MPa, yield strength is 257 MPa, yield strength ratio is 0.706, elongation after fracture is 45%, and resistivity is 12.3 μΩ·cm; the high temperature performance at 400°C is as follows: tensile strength is 271 MPa, yield strength is 186 MPa, yield strength ratio is 0.686, and resistivity is 12.9 μΩ·cm.

[0079] Comparative Example 1

[0080] A steel for an electrolytic aluminum anode steel claw, wherein the chemical composition of the steel for an electrolytic aluminum anode steel claw is, by mass percentage, C 0.017%, Ti 0.03%, Cu 0.22%, Mo 0.02%, Si 0.007%, Mn 0.021%, Cr 0.018%, Ni≤0.011%, Al≤0.015%, P≤0.007%, S≤0.006%, and the rest is Fe and inevitable trace chemical elements; wherein (Ti+Mo) / C is approximately 2.94.

[0081] A method for preparing the steel for electrolytic aluminum anode steel claws based on the above method comprises the following steps:

[0082] S1. Weighing raw materials: The raw materials are proportioned according to the chemical composition content of the steel for the electrolytic aluminum anode steel claw, and then each raw material is weighed, and each raw material includes scrap steel, miscellaneous steel and intermediate alloy to obtain weighed raw materials;

[0083] S2, smelting and continuous casting: the raw materials weighed in S1 are smelted at a smelting temperature of 1600-1650°C, and then continuously cast at a continuous casting temperature of 1500-1550°C to obtain a continuously cast ingot; the ingot size is 200mm×200mm×6000mm;

[0084] S3, homogenization heat treatment: the ingot formed by continuous casting in S2 is heated to the temperature of the soaking section and kept warm, the soaking section temperature is 1010°C, the holding time is 2 hours, and the continuous casting ingot with uniform microstructure before hot rolling is obtained;

[0085] S4, hot rolling: hot rolling is performed on the continuous casting billet with uniform organizational structure before S3 hot rolling, the starting rolling temperature of hot rolling is controlled at 855°C, the final rolling temperature is controlled at 760°C, and the steel is air-cooled to room temperature after rolling to obtain the steel for electrolytic aluminum anode steel claws.

[0086] The microstructure of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this comparative example is 97.2% by volume of ferrite and 2.8% by volume of pearlite, and also has 0.1% by volume of (Ti, Mo) C and Cu precipitation.

[0087] The ferrite of the high-temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this comparative example is equiaxed in shape, with an average grain size of 16 μm; the pearlite is lamellar in shape, with an average grain size of 4.1 μm; and the (Ti, Mo) C and Cu are spherical in shape, with an average particle size of 14 nm.

[0088] The room temperature properties of the steel for electrolytic aluminum anode steel claws prepared in this comparative example are: tensile strength of 336 MPa, yield strength of 242 MPa, yield strength ratio of 0.720, elongation after fracture of 48%, and resistivity of 12.5 μΩ·cm; the high temperature properties at 400°C are: tensile strength of 251 MPa, yield strength of 160 MPa, yield strength ratio of 0.637, and resistivity of 16.4 μΩ·cm.

[0089] Comparative Example 2

[0090] A steel for an electrolytic aluminum anode steel claw, wherein the chemical composition of the steel for an electrolytic aluminum anode steel claw is, by mass percentage, C 0.022%, Ti 0.06%, Cu 0.02%, Mo 0.06%, Si 0.006%, Mn 0.026%, Cr 0.022%, Ni≤0.011%, Al≤0.015%, P≤0.007%, S≤0.006%, and the rest is Fe and inevitable trace chemical elements; wherein (Ti+Mo) / C is approximately 5.45.

[0091] A method for preparing the steel for electrolytic aluminum anode steel claws based on the above method comprises the following steps:

[0092] S1. Weighing raw materials: The raw materials are proportioned according to the chemical composition content of the steel for the electrolytic aluminum anode steel claw, and then each raw material is weighed, and each raw material includes scrap steel, miscellaneous steel and intermediate alloy to obtain weighed raw materials;

[0093] S2, smelting and continuous casting: the raw materials weighed in S1 are smelted at a smelting temperature of 1600-1650°C, and then continuously cast at a continuous casting temperature of 1500-1550°C to obtain a continuously cast ingot; the ingot size is 200mm×200mm×6000mm;

[0094] S3, homogenization heat treatment: the ingot formed by continuous casting in S2 is heated to the temperature of the soaking section and kept warm, the soaking section temperature is 1000°C, the holding time is 2.5h, and the continuous casting ingot with uniform microstructure before hot rolling is obtained;

[0095] S4, hot rolling: hot rolling is performed on the continuous casting billet with uniform organizational structure before S3 hot rolling, the starting rolling temperature of hot rolling is controlled at 870°C, the final rolling temperature is controlled at 770°C, and after rolling, it is air-cooled to room temperature to obtain the steel for electrolytic aluminum anode steel claws.

[0096] The microstructure of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this comparative example is 93.7% by volume of ferrite and 6.3% by volume of pearlite, and also has a total volume fraction of 0.12% of (Ti, Mo) C and Cu precipitation.

[0097] The ferrite of the high-temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this comparative example is equiaxed in shape, with an average grain size of 33 μm; the pearlite is lamellar in shape, with an average grain size of 8.2 μm; and the (Ti, Mo) C and Cu are spherical in shape, with an average particle size of 15 nm.

[0098] The room temperature properties of the steel for electrolytic aluminum anode steel claws prepared in this comparative example are: tensile strength of 316MPa, yield strength of 224MPa, yield strength ratio of 0.709, elongation after fracture of 49%, and resistivity of 14.3μΩ·cm; the high temperature properties at 400℃ are: tensile strength of 268MPa, yield strength of 155MPa, yield strength ratio of 0.578, and resistivity of 15.3μΩ·cm.

[0099] It can be seen that compared with Examples 1-2 of the present application, the amount of Ti added in Comparative Example 1-2 is insufficient, resulting in a (Ti+Mo) / C ratio of less than 3, resulting in insufficient amount of precipitates and low high-temperature strength values. At the same time, due to insufficient precipitation, not enough C is consumed, resulting in severe electron scattering, which significantly increases its resistivity.

[0100] In comparative example 2, insufficient Cu is added, resulting in insufficient Cu precipitation, causing low room temperature and high temperature strength values. At the same time, the lack of Cu seriously affects its conductive properties, causing a significant increase in resistivity.

[0101] Example 3

[0102] A high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws, wherein the chemical composition of the high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws is as follows by mass percentage: C 0.035%, Ti 0.06%, Cu 0.29%, Mo 0.05%, Si 0.008%, Mn 0.015%, Cr 0.023%, Ni≤0.011%, Al≤0.015%, P≤0.007%, S≤0.006%, and the rest is Fe and inevitable trace chemical elements; wherein, (Ti+Mo) / C is approximately 3.14.

[0103] A method for preparing the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel based on the above method comprises the following steps:

[0104] S1. Weighing raw materials: The raw materials are proportioned according to the chemical composition content of the steel for the high temperature resistant and high conductivity electrolytic aluminum anode steel claw, and then each raw material is weighed, and each raw material includes scrap steel, miscellaneous steel and intermediate alloy to obtain weighed raw materials;

[0105] S2, smelting and continuous casting: the raw materials weighed in S1 are smelted at a smelting temperature of 1600-1650°C, and then continuously cast at a continuous casting temperature of 1500-1550°C to obtain a continuously cast ingot; the ingot size is 200mm×200mm×6000mm;

[0106] S3, homogenization heat treatment: the ingot formed by continuous casting in S2 is heated to the temperature of the soaking section and kept warm, the soaking section temperature is 960°C, the holding time is 2h, and the continuous casting ingot with uniform microstructure before hot rolling is obtained;

[0107] S4, hot rolling: hot rolling is performed on the continuous casting billet with uniform organizational structure before S3 hot rolling. The starting rolling temperature of hot rolling is controlled at 875°C, the final rolling temperature is controlled at 735°C, and the billet is air-cooled to room temperature after rolling to obtain high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel.

[0108] The microstructure of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment is 98.6% by volume of ferrite and 1.4% by volume of pearlite, and also contains 0.34% by volume of (Ti, Mo) C and Cu precipitation.

[0109] The ferrite of the high-temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment is equiaxed in shape, with an average grain size of 22 μm; the pearlite is lamellar in shape, with an average grain size of 8.5 μm; the (Ti, Mo) C and Cu are spherical in shape, with an average particle size of 17 nm.

[0110] The room temperature properties of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment are as follows: tensile strength is 376 MPa, yield strength is 277 MPa, yield strength ratio is 0.737, elongation after fracture is 47%, and resistivity is 11.5 μΩ·cm; the high temperature performance at 400°C is as follows: tensile strength is 285 MPa, yield strength is 188 MPa, yield strength ratio is 0.660, and resistivity is 12.5 μΩ·cm.

[0111] Example 4

[0112] A high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws, wherein the chemical composition of the high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws is as follows by mass percentage: C 0.028%, Ti 0.09%, Cu 0.21%, Mo 0.08%, Si 0.006%, Mn 0.023%, Cr 0.017%, Ni≤0.011%, Al≤0.015%, P≤0.007%, S≤0.006%, and the rest is Fe and inevitable trace chemical elements; wherein, (Ti+Mo) / C is approximately 5.71.

[0113] A method for preparing the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel based on the above method comprises the following steps:

[0114] S1. Weighing raw materials: The raw materials are proportioned according to the chemical composition content of the steel for the high temperature resistant and high conductivity electrolytic aluminum anode steel claw, and then each raw material is weighed, and each raw material includes scrap steel, miscellaneous steel and intermediate alloy to obtain weighed raw materials;

[0115] S2, smelting and continuous casting: the raw materials weighed in S1 are smelted at a smelting temperature of 1600-1650°C, and then continuously cast at a continuous casting temperature of 1500-1550°C to obtain a continuously cast ingot; the ingot size is 200mm×200mm×6000mm;

[0116] S3, homogenization heat treatment: the ingot formed by continuous casting in S2 is heated to the temperature of the soaking section and kept warm, the soaking section temperature is 965°C, the holding time is 2.5h, and the continuous casting ingot with uniform microstructure before hot rolling is obtained;

[0117] S4, hot rolling: hot rolling is performed on the continuous casting billet with uniform organizational structure before S3 hot rolling. The starting rolling temperature of hot rolling is controlled at 870°C, the final rolling temperature is controlled at 755°C, and the billet is air-cooled to room temperature after rolling to obtain high temperature resistant and high conductivity electrolytic aluminum anode steel claw steel.

[0118] The microstructure of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment is 95.5% by volume of ferrite and 4.5% by volume of pearlite, and also has a total volume fraction of 0.31% of (Ti, Mo) C and Cu precipitation.

[0119] The ferrite of the high-temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment is equiaxed in shape, with an average grain size of 19 μm; the pearlite is lamellar in shape, with an average grain size of 10.2 μm; the (Ti, Mo) C and Cu are spherical in shape, with an average particle size of 16 nm.

[0120] The room temperature properties of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment are as follows: tensile strength is 362MPa, yield strength is 244MPa, yield strength ratio is 0.674, elongation after fracture is 42%, and resistivity is 11.8μΩ·cm; the high temperature performance at 400°C is as follows: tensile strength is 282MPa, yield strength is 208MPa, yield strength ratio is 0.738, and resistivity is 13.7μΩ·cm.

[0121] Example 5

[0122] A high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws, wherein the chemical composition of the high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws is as follows by mass percentage: C 0.021%, Ti 0.07%, Cu 0.24%, Mo 0.08%, Si 0.009%, Mn 0.017%, Cr 0.025%, Ni≤0.011%, Al≤0.015%, P≤0.007%, S≤0.006%, and the rest is Fe and inevitable trace chemical elements; wherein (Ti+Mo) / C is approximately 5.71.

[0123] A method for preparing the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel based on the above method comprises the following steps:

[0124] S1. Weighing raw materials: The raw materials are proportioned according to the chemical composition content of the steel for the high temperature resistant and high conductivity electrolytic aluminum anode steel claw, and then each raw material is weighed, and each raw material includes scrap steel, miscellaneous steel and intermediate alloy to obtain weighed raw materials;

[0125] S2, smelting and continuous casting: the raw materials weighed in S1 are smelted at a smelting temperature of 1600-1650°C, and then continuously cast at a continuous casting temperature of 1500-1550°C to obtain a continuously cast ingot; the ingot size is 200mm×200mm×6000mm;

[0126] S3, homogenization heat treatment: the ingot formed by continuous casting in S2 is heated to the temperature of the soaking section and kept warm, the soaking section temperature is 990°C, the holding time is 2h, and the continuous casting ingot with uniform microstructure before hot rolling is obtained;

[0127] S4, hot rolling: hot rolling is performed on the continuous casting billet with uniform organizational structure before S3 hot rolling. The starting rolling temperature of hot rolling is controlled at 865°C, the final rolling temperature is controlled at 760°C, and the billet is air-cooled to room temperature after rolling to obtain high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel.

[0128] The microstructure of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment is 95.2% by volume of ferrite and 4.8% by volume of pearlite, and also contains 0.32% by volume of (Ti, Mo) C and Cu precipitation.

[0129] The ferrite of the high-temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment is equiaxed in shape, with an average grain size of 33 μm; the pearlite is lamellar in shape, with an average grain size of 7.9 μm; the (Ti, Mo) C and Cu are spherical in shape, with an average particle size of 18 nm.

[0130] The room temperature properties of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment are as follows: tensile strength is 369 MPa, yield strength is 264 MPa, yield strength ratio is 0.715, elongation after fracture is 41%, and resistivity is 12.1 μΩ·cm; the high temperature performance at 400°C is as follows: tensile strength is 311 MPa, yield strength is 204 MPa, yield strength ratio is 0.656, and resistivity is 12.8 μΩ·cm.

[0131] Example 6

[0132] A high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws, wherein the chemical composition of the high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws is as follows by mass percentage: C 0.037%, Ti 0.08%, Cu 0.27%, Mo 0.07%, Si 0.008%, Mn 0.019%, Cr 0.019%, Ni≤0.011%, Al≤0.015%, P≤0.007%, S≤0.006%, and the rest is Fe and inevitable trace chemical elements; wherein (Ti+Mo) / C is approximately 4.05.

[0133] A method for preparing the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel based on the above method comprises the following steps:

[0134] S1. Weighing raw materials: The raw materials are proportioned according to the chemical composition content of the steel for the high temperature resistant and high conductivity electrolytic aluminum anode steel claw, and then each raw material is weighed, and each raw material includes scrap steel, miscellaneous steel and intermediate alloy to obtain weighed raw materials;

[0135] S2, smelting and continuous casting: the raw materials weighed in S1 are smelted at a smelting temperature of 1600-1650°C, and then continuously cast at a continuous casting temperature of 1500-1550°C to obtain a continuously cast ingot; the ingot size is 200mm×200mm×6000mm;

[0136] S3, homogenization heat treatment: the ingot formed by continuous casting in S2 is heated to the temperature of the soaking section and kept warm, the soaking section temperature is 975°C, the holding time is 2h, and the continuous casting ingot with uniform microstructure before hot rolling is obtained;

[0137] S4, hot rolling: hot rolling is performed on the continuous casting billet with uniform organizational structure before S3 hot rolling. The starting rolling temperature of hot rolling is controlled at 880°C, the final rolling temperature is controlled at 740°C, and air-cooling is performed to room temperature after rolling to obtain high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel.

[0138] The microstructure of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment is 97.9% by volume of ferrite and 2.1% by volume of pearlite, and also contains 0.37% by volume of (Ti, Mo) C and Cu precipitation.

[0139] The ferrite of the high-temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment is equiaxed in shape, with an average grain size of 20 μm; the pearlite is lamellar in shape, with an average grain size of 13.2 μm; the (Ti, Mo) C and Cu are spherical in shape, with an average particle size of 20 nm.

[0140] The room temperature properties of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared in this embodiment are as follows: tensile strength is 381 MPa, yield strength is 272 MPa, yield strength ratio is 0.714, elongation after fracture is 40%, and resistivity is 11.7 μΩ·cm; the high temperature properties at 400°C are as follows: tensile strength is 298 MPa, yield strength is 203 MPa, yield strength ratio is 0.681, and resistivity is 12.6 μΩ·cm.

[0141] The above scheme, the present invention proposes a high-temperature resistant and highly conductive steel for electrolytic aluminum anode steel claws and a preparation method, which can solve the technical problems existing in the prior art electrolytic aluminum anode steel claws: 1) The chemical composition of steel is sensitive to performance requirements, and there are many types of added elements, including the addition of high-cost alloy elements, which leads to high production costs; 2) The low strength caused by low carbon content, the low electrical conductivity caused by the addition of alloy elements, and the low corrosion resistance caused by the uneven oxide film layer, all of which result in a short service life of the steel claws; 3) High-temperature mechanical properties, corrosion resistance, conductivity and their stability are not fully considered; 4) Although the preparation of the surface coating can improve the overall performance, the selection of the coating composition will increase the raw material cost, and different preparation processes will make the coating uneven and have poor adhesion.

[0142] The present invention forms a dense oxide film on the steel surface through the synergistic effect of Cu and Mo, which significantly improves the corrosion resistance of the steel, thereby extending the service time of the steel claw in the electrolytic aluminum tank and reducing maintenance costs.

[0143] The present invention controls the amount and size of precipitates by adjusting the (Ti+Mo) / C ratio and adding the Cu element, thereby reducing the amount of solid-solution C in the matrix, reducing the scattering of electrons, and increasing the electrical conductivity. Meanwhile, the precipitation of (Ti, Mo)C and Cu improves the room temperature and high temperature strength of the steel of the present invention.

[0144] The present invention selects low-cost raw materials, performs heat preservation treatment in a soaking section before hot rolling, and controls the rolling reduction during the hot rolling process, so that the prepared material can synergistically improve the room temperature mechanical properties, room temperature corrosion resistance and room temperature electrical conductivity, as well as the high temperature mechanical properties, high temperature corrosion resistance and high temperature electrical conductivity and its high temperature stability without the need for surface coating.

[0145] The room temperature properties of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel prepared by the present invention are as follows: tensile strength is not less than 330 MPa, yield strength is not less than 235 MPa, elongation after fracture is not less than 35%, and resistivity is not higher than 13 μΩ·cm; the high temperature properties at 400°C are as follows: tensile strength is not less than 270 MPa, yield strength is not less than 180 MPa, and resistivity is not higher than 14 μΩ·cm.

[0146] In summary, compared with other traditional methods, the method of the present invention prepares high-temperature resistant and highly conductive electrolytic aluminum anode steel claw steel by adjusting the (Ti+Mo) / C ratio and adding Cu elements, selecting low-cost raw materials and heat preservation treatment in the soaking section before hot rolling, and controlling the rolling reduction amount in the hot rolling process; the method is simple and easy to operate, green and environmentally friendly, low in cost, short in process, high in efficiency, wide in application range, and conducive to large-scale industrial production and promotion.

[0147] It should be understood that the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship, but it may also indicate an "and / or" relationship. Please refer to the context for specific understanding.

[0148] In the present invention, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0149] It should be understood that in various embodiments of the present invention, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0150] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high temperature resistant and highly conductive steel for electrolytic aluminum anode claws, characterized in that: The chemical composition of the steel for the high temperature resistant and high conductivity electrolytic aluminum anode steel claw is as follows by mass percentage: C 0.01-0.04%, Ti 0.06-0.09%, Cu 0.2-0.3%, Mo 0.01-0.1%, Si≤0.011%, Mn≤0.030%, Cr≤0.025%, Ni≤0.011%, Al≤0.015%, P≤0.007%, S≤0.006%, and the rest are Fe and inevitable trace chemical elements; wherein, (Ti+Mo) / C is 3-6.

2. The high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel according to claim 1, characterized in that: The microstructure of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel is 93-99% by volume of ferrite and no more than 7% by volume of pearlite, and also contains 0.2-0.4% by volume of (Ti, Mo) C and Cu precipitation.

3. The high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel according to claim 2, characterized in that: The ferrite of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel is equiaxed in shape, with an average grain size of 10-50 μm; the pearlite is lamellar in shape, with an average grain size of 5-20 μm; (Ti, Mo) C and Cu are spherical in shape, with an average particle size not higher than 30 nm.

4. The high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel according to claim 1, characterized in that: The room temperature properties of the steel for the high temperature resistant and highly conductive electrolytic aluminum anode steel claws are as follows: tensile strength not less than 330 MPa, yield strength not less than 235 MPa, elongation after fracture not less than 35%, and resistivity not higher than 13 μΩ·cm; the high temperature properties at 400°C are as follows: tensile strength not less than 270 MPa, yield strength not less than 180 MPa, and resistivity not higher than 14 μΩ·cm.

5. A method for preparing high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel according to claim 1, characterized in that: The preparation method of the high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel comprises the following steps: S1. Weighing raw materials: proportioning the raw materials according to the chemical composition content of the steel for the high temperature resistant and high conductivity electrolytic aluminum anode steel claw, and then weighing each raw material to obtain weighed raw materials; S2, smelting and continuous casting: smelting the raw materials weighed in S1, and then continuously casting to obtain a continuous casting billet; S3, homogenization heat treatment: heating the ingot formed by continuous casting in S2 to the temperature of the soaking section and keeping it warm to obtain a continuous casting ingot with uniform microstructure before hot rolling; S4, hot rolling: hot rolling the continuous casting billet with uniform structure before S3 hot rolling, air cooling to room temperature after rolling, and obtaining high temperature resistant and high conductivity electrolytic aluminum anode steel claw steel.

6. The method for preparing high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel according to claim 5, characterized in that: S1 raw materials include scrap steel, miscellaneous steel and master alloy.

7. The method for preparing high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel according to claim 5, characterized in that: The S2 melting temperature is 1600-1650℃, the continuous casting temperature is 1500-1550℃, and the billet size is 200mm×200mm×6000mm.

8. The method for preparing high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel according to claim 5, characterized in that: The temperature of S3 soaking section is 950-1050℃, the heating rate is 5-10℃ / min, and the holding time is ≥120min, which ensures uniform heating of materials while shortening the heating time and improving production efficiency.

9. The method for preparing high temperature resistant and highly conductive electrolytic aluminum anode steel claw steel according to claim 5, characterized in that: The starting rolling temperature of S4 hot rolling is controlled at 840-900℃, and the final rolling temperature is controlled at 720-780℃.

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