Preparation method of nickel-based electrothermal alloy wire

Abstract

The invention belongs to the technical field of electrothermal alloy material manufacturing, and particularly relates to a preparation method of a nickel-based electrothermal alloy wire, which comprises the following specific steps: S1, molten steel smelting: adopting electric furnace smelting, AOD furnace smelting and LF furnace refining to prepare molten steel meeting chemical component requirements; s2, continuous casting, wherein the molten steel is guided into a tundish and continuously cast into square billets through a casting machine; s3, heating, wherein the square billet is put into a heating furnace to be heated; s4, blooming and cogging are conducted, specifically, high-pressure water is adopted for removing phosphorus on the surface of the heated square billet, surface oxide skin is removed, and a round blooming billet is obtained through rolling; s5, wire rod rolling: carrying out electromagnetic induction heating on the round blooming blank, and carrying out rough rolling, intermediate rolling, pre-finish rolling and finish rolling to obtain a wire rod; and S6, off-line solid solution treatment is conducted on the wire rod, the solid solution temperature is controlled to be 1050 + / -10 DEG C, the heat preservation time is controlled to be 45-75 min, and after heat preservation is finished, the wire rod is taken out of the furnace and subjected to water cooling. According to the preparation method, procedures are reduced, the process is shortened, the yield and the production efficiency of wire products are greatly improved, and the cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of electrothermal alloy material manufacturing, and in particular relates to a method for preparing a nickel-based electrothermal alloy wire. Background Art

[0002] Nickel-based electric heating alloy is an important variety of electric heating alloy. Due to the high content of chromium, nickel, silicon and other elements, it has excellent high temperature resistance, oxidation resistance, corrosion resistance, high resistivity, uniform and stable electrical properties, and no high temperature brittleness. It is widely used in the manufacturing of heating components in industries such as metallurgy, chemical industry, machinery, ceramics and household appliances. At present, this nickel-based electric heating alloy is usually produced by the "vacuum induction + electroslag remelting" smelting process. The ingot is forged and rolled after high-temperature homogenization treatment. The production process has a long cycle and complex process. Not only is the yield rate low and the manufacturing cost high, but the product batch quality fluctuates greatly, which seriously affects the service life of the product. In addition, the alloy has high Cr and Ni content, and contains Si element. There are many complex precipitation phases in the cast structure, and cracking problems are prone to occur during hot working. Summary of the invention

[0003] The purpose of the present invention is to provide a method for preparing a nickel-based electric heating alloy wire, so as to solve the problems that the existing nickel-based electric heating alloy production process has a long cycle, a complex process, a large number of complex precipitation phases in the cast structure, and cracking is easy to occur during hot working.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme: A method for preparing a nickel-based electric heating alloy wire, the specific steps are as follows: S1: Molten steel smelting: Electric furnace smelting + AOD furnace smelting + LF furnace refining are used to produce molten steel that meets the chemical composition requirements; S2: Continuous casting: The molten steel after LF refining is introduced into the tundish and continuously cast into billets through the casting machine; S3: Heating: loading the billet into a heating furnace for heating; S4: Initial rolling: high-pressure water is used to remove phosphorus and surface oxide scale on the surface of the heated square billet, and then a round initial rolling billet is obtained by rolling; S5: Wire rod rolling: The round billet is subjected to electromagnetic induction heating, and then rolled into wire rod through rough rolling, intermediate rolling, pre-finishing rolling and finishing rolling; S6: Offline solution treatment of wire: The wire rod is subjected to offline solution treatment, the solution temperature is controlled at 1050±10℃, the holding time is controlled at 45-75min, and after the holding period, it is taken out of the furnace and water-cooled to improve the drawing performance of the wire.

[0005] Preferably, the chemical composition of the molten steel obtained by smelting the molten steel in step S1 is controlled by mass percentage as follows: C: 0.01-0.03%, Si: 0.75-1.60%, Mn≤0.60%, P≤0.020%, S≤0.010%, Cr: 20.0-23.0%, Fe≤1.0%, Al: 0.15-0.25%, Ti: 0.10-0.20%, N≤0.0070%, Cu≤0.50%, and the rest are Ni and unavoidable impurities.

[0006] Preferably, the continuous casting process parameters in step S2 are: the temperature of the molten steel in the tundish is controlled at 25-45°C above the melting point, the casting speed is 0.70-0.90 m / min, the vibration amplitude of the crystallizer is controlled at ±2.2 mm, the negative slip time is controlled at 0.115 s, and the water volume of the crystallizer is 110-120 m 3 / h, secondary cooling water volume 65-75L / min, electromagnetic stirring is used in the crystallizer and the end of solidification.

[0007] Preferably, in the heating process in step S3, the furnace temperatures of the heating section and the soaking section are both controlled at 1180-1220° C., and the total time of the heating section and the soaking section is controlled at 2-2.5 h.

[0008] Preferably, in step S4, the initial rolling is set to 9 passes, the rolling temperature is controlled at 1080-1130°C, the first three passes are controlled at 10-15%, and the strain rate is controlled at 1.5-5.0s -1 The total deformation of the first three passes is controlled at 30-40%; then the elliptical-round hole type is used to continue rolling, the pass elongation coefficient is controlled at 1.2-1.4, the rolling speed is controlled at 2.0-4.0m / s, the final rolling temperature is controlled at ≥950℃, and the billet specification after the initial rolling is φ80-φ90mm.

[0009] Preferably, in step S5, the rough rolling inlet temperature is controlled at 1030-1070°C, the final rolling temperature is controlled at 1050-1100°C, the elongation coefficient of each pass of the finishing rolling is controlled at 1.15-1.35, the final rolling speed is controlled at 50-60m / s, the spinning temperature is controlled at 1000-1050°C, and the spinning is quickly water-cooled after spinning.

[0010] Compared with the prior art, the present invention has the following beneficial effects: (1) Due to the high content of chromium, nickel and silicon alloy in nickel-based electric heating alloy, elements segregate and precipitate phases are easily formed during the solidification process, which affects the subsequent thermal processing and the performance of the finished wire. In the continuous casting process, electromagnetic stirring is used in the crystallizer to force the molten steel to flow, reduce the solidification temperature gradient, reduce element segregation, break columnar crystals, and increase the crystal nucleation rate; electromagnetic stirring is used at the end of solidification to promote the flow and heat transfer of molten steel in the mushy zone, prevent center segregation, reduce center looseness and shrinkage, and increase the equiaxed crystal rate of the ingot; (2) In the continuous casting process, by reasonably matching the pouring temperature, casting speed, mold water volume and vibration parameters, combined with optimizing the key process parameters such as the secondary cooling water ratio, and using electromagnetic stirring, the coarse columnar crystal structure inside the ingot is avoided, the dendrite element segregation of the ingot is reduced, and the number and size of complex precipitated phases are reduced, so that the surface of the square billet is free of defects such as slag inclusions and cracks; (3) As the surface quality of the billet is good and the deep marks are shallow, the surface defects can be removed by heating oxidation and burning before initial rolling without the need for grinding process. According to the dendrite element segregation and precipitation phase inside the billet, combined with the production rhythm of the on-site heating furnace, a billet pre-rolling heating process is formulated to eliminate dendrite element segregation and fully dissolve the complex precipitation phase, providing a better organizational foundation for subsequent hot processing and improving the thermal deformation capacity of the continuous casting billet. Compared with the traditional process, it reduces the homogenization heat treatment process of the continuous casting billet, shortens the process flow, and saves process costs; (4) By studying the hot working characteristics of steel grades, the number of initial rolling passes, deformation amount per pass, and strain rate of square billets are optimized to avoid the problem of easy cracking during billet rolling and obtain initial rolled round billets with good surface quality; (5) By rationally matching the process parameters of rough rolling, intermediate rolling, pre-finishing rolling and finishing rolling, the surface of the prepared nickel-based electric heating alloy wire is free of defects such as folding, cracking and warping, achieving good wire surface quality; (6) The preparation method reduces the number of steps, shortens the process, greatly improves the yield rate and production efficiency of wire products, reduces costs, and achieves high-quality and stable production of wire products. DETAILED DESCRIPTION

[0011] The technical solution of the present invention is described clearly and completely below in conjunction with the embodiments. Example 1

[0012] A method for preparing a nickel-based electric heating alloy wire, the specific steps are as follows: S1: Molten steel smelting: Electric furnace smelting + AOD furnace smelting + LF furnace refining are adopted, and the chemical composition of the molten steel is as follows by mass percentage: C: 0.01%, Si: 0.95%, Mn: 0.53%, P: 0.017%, S: 0.001%, Cr: 22.35%, Fe: 0.63%, Al: 0.18%, Ti: 0.17%, N: 0.0065%, Cu: 0.30%, and the rest is Ni and unavoidable impurities; S2: Continuous casting: The molten steel after LF refining is introduced into the tundish and continuously cast into billets through the casting machine. The continuous casting process parameters are: the temperature of the molten steel in the tundish is controlled at 25-40℃ above the melting point, the billet pulling speed is 0.75m / min, the vibration amplitude of the crystallizer is controlled at ±2.2mm, the negative slip time is controlled at 0.115s, and the water volume of the crystallizer is 115m 3 / h, secondary cooling water volume 68L / min, electromagnetic stirring is used in the crystallizer and at the end of solidification, the billet specifications produced by continuous casting are 220*220mm, there are no defects such as slag inclusions and cracks on the billet surface, the vibration mark depth is 0.20mm, and the billet cutting specifications are 220*220*3600mm; S3: Heating: The billet is loaded into a heating furnace for heating, wherein the furnace temperature of the heating section and the soaking section are controlled at 1200-1220°C, and the heating section and the soaking section time are 2 hours; S4: Initial rolling: high-pressure water is used to remove phosphorus and surface oxide scale on the heated square billet surface, and then the round initial rolling billet is obtained by rolling. The initial rolling is set to 9 passes, and the rolling temperature is controlled at 1100℃. The deformation of the first three passes is 12.93%, 12.20%, and 12.84%, respectively, and the strain rate is 1.83s -1 , 1.59s -1 , 2.48s -1 , the total deformation of the first three passes was controlled at 33.37%; then the elliptical-round hole type was used to continue rolling, the pass elongation coefficient was controlled at 1.2-1.4, the rolling speed was controlled at 2.0-4.0m / s, the final rolling temperature was controlled at 980℃, and the billet specification after the initial rolling was φ85mm; S5: Wire rolling: The round billet is subjected to electromagnetic induction heating, and then rolled into wire through rough rolling, intermediate rolling, pre-finishing rolling and finishing rolling, wherein the rough rolling inlet temperature is controlled at 1045°C, the final rolling temperature is controlled at 1070°C, the elongation coefficient of each pass of finishing rolling is controlled at 1.15-1.35, the final rolling speed is controlled at 53m / s, the wire laying temperature is controlled at 1020°C, and the wire is quickly cooled by water after laying. After the final rolling, the wire specification is φ5.5mm; S6: Offline solution treatment of wire rod: The wire rod is subjected to offline solution treatment, the solution temperature is controlled at 1050℃, the holding time is controlled at 70min, and after the holding period, it is taken out of the furnace and water-cooled.

[0013] The nickel-based electric heating alloy wire obtained by this preparation method has no defects such as folding, cracking, and warping on the surface. The finished product has a grain size of 5.5, a tensile strength of 637 MPa, an elongation of 55%, a cross-sectional shrinkage rate of 79%, and a total inclusion rating of A+B+C+D of 0.5. Example 2

[0014] A method for preparing a nickel-based electric heating alloy wire, the specific steps are as follows: S1: Molten steel smelting: Electric furnace smelting + AOD furnace smelting + LF furnace refining are adopted, and the chemical composition of the molten steel is as follows by mass percentage: C: 0.023%, Si: 1.52%, Mn: 0.19%, P: 0.013%, S: 0.001%, Cr: 22.63%, Fe: 0.55%, Al: 0.15%, Ti: 0.16%, N: 0.0063%, Cu: 0.27%, and the rest is Ni and unavoidable impurities; S2: Continuous casting: The molten steel after LF refining is introduced into the tundish and continuously cast into billets through the casting machine. The continuous casting process parameters are: the temperature of the molten steel in the tundish is controlled at 30-45℃ above the melting point, the billet pulling speed is 0.8m / min, the vibration amplitude of the crystallizer is controlled at ±2.2mm, the negative slip time is controlled at 0.115s, and the water volume of the crystallizer is 110m 3 / h, secondary cooling water volume 66L / min, crystallizer and electromagnetic stirring at the end of solidification are put into use. The billet specifications produced by continuous casting are 220*220mm, there are no defects such as slag inclusions and cracks on the billet surface, the vibration mark depth is 0.21mm, and the billet cutting specifications are 220*220*3600mm; S3: Heating: The billet is loaded into a heating furnace for heating, wherein the furnace temperature of the heating section and the soaking section are both controlled at 1190-1220°C, and the heating section and the soaking section time are 2.5 hours; S4: Initial rolling: high-pressure water is used to remove phosphorus and surface oxide scale on the surface of the heated square billet, and a round initial rolling billet is obtained by rolling. The initial rolling is set to 9 passes, and the rolling temperature is controlled at 1090°C. The deformations of the first three passes are 13.22%, 11.37%, and 13.68%, respectively, and the strain rates are 1.77s-1, 2.09s-1, and 3.06s-1, respectively. The total deformation of the first three passes is controlled at 33.62%; then the elliptical-round hole type is used to continue rolling, the pass elongation coefficient is controlled at 1.2-1.4, the rolling speed is controlled at 2.0-4.0m / s, and the final rolling temperature is controlled at 960°C. After the initial rolling, the billet specification is φ90mm; S5: Wire rolling: The round billet is subjected to electromagnetic induction heating, and then rolled into wire through rough rolling, intermediate rolling, pre-finishing rolling and finishing rolling, wherein the rough rolling inlet temperature is controlled at 1060°C, the final rolling temperature is controlled at 1090°C, the elongation coefficient of each pass of finishing rolling is controlled at 1.15-1.35, the final rolling speed is controlled at 56m / s, the wire laying temperature is controlled at 1030°C, and the wire is quickly cooled by water after laying. After the final rolling, the wire specification is φ5.5mm; S6: Offline solution treatment of wire rod: The wire rod is subjected to offline solution treatment, the solution temperature is controlled at 1040℃, the holding time is controlled at 50min, and the wire rod is taken out of the furnace and water-cooled after the holding period is completed.

[0015] The nickel-based electric heating alloy wire obtained by this preparation method has no defects such as folding, cracking, and warping on the surface. The finished product has a grain size of level 5, a tensile strength of 648 MPa, an elongation of 57%, a cross-sectional shrinkage rate of 80%, and a total inclusion rating of A+B+C+D of 0.5. Example 3

[0016] A method for preparing a nickel-based electric heating alloy wire, the specific steps are as follows: S1: Molten steel smelting: Electric furnace smelting + AOD furnace smelting + LF furnace refining are adopted, and the chemical composition of the molten steel is as follows by mass percentage: C: 0.025%, Si: 1.36%, Mn: 0.25%, P: 0.020%, S: 0.001%, Cr: 21.82%, Fe: 0.58%, Al: 0.22%, Ti: 0.19%, N: 0.0060%, Cu: 0.20%, and the rest is Ni and unavoidable impurities; S2: Continuous casting: The molten steel after LF refining is introduced into the tundish and continuously cast into billets through the casting machine. The continuous casting process parameters are: the temperature of the molten steel in the tundish is controlled at 28-42℃ above the melting point, the billet pulling speed is 0.7m / min, the vibration amplitude of the crystallizer is controlled at ±2.2mm, the negative slip time is controlled at 0.115s, and the water volume of the crystallizer is 120m 3 / h, secondary cooling water volume 73L / min, crystallizer and electromagnetic stirring at the end of solidification are put into use. The billet specifications produced by continuous casting are 220*220mm, there are no defects such as slag inclusions and cracks on the billet surface, the vibration mark depth is 0.22mm, and the billet cutting specifications are 220*220*3600mm; S3: Heating: The billet is loaded into a heating furnace for heating, wherein the furnace temperature of the heating section and the soaking section are controlled at 1190-1200°C, and the heating section and the soaking section time are 2.5h; S4: Initial rolling: high-pressure water is used to remove phosphorus and surface oxide scale on the heated square billet surface, and then the round initial rolling billet is obtained by rolling. The initial rolling is set to 9 passes, and the rolling temperature is controlled at 1120℃. The deformation of the first three passes is 14.15%, 14.12%, and 14.98%, respectively, and the strain rate is 1.85s -1 , 2.54s -1 、3.77s -1 , the total deformation of the first three passes was controlled at 37.31%; then the elliptical-round hole type was used to continue rolling, the pass elongation coefficient was controlled at 1.2-1.4, the rolling speed was controlled at 2.0-4.0m / s, the final rolling temperature was controlled at 960℃, and the billet specification after the initial rolling was 80mm; S5: Wire rolling: The round billet is subjected to electromagnetic induction heating, and then rolled into wire through rough rolling, intermediate rolling, pre-finishing rolling and finishing rolling, wherein the rough rolling inlet temperature is controlled at 1070°C, the final rolling temperature is controlled at 1050°C, the elongation coefficient of each pass of finishing rolling is controlled at 1.15-1.35, the final rolling speed is controlled at 58m / s, the wire laying temperature is controlled at 1020°C, and the wire is quickly water-cooled after laying. After the final rolling, the wire specification is φ5.5mm; S6: Offline solution treatment of wire rod: The wire rod is subjected to offline solution treatment, the solution temperature is controlled at 1060℃, the holding time is controlled at 60min, and the wire rod is taken out of the furnace and water-cooled after the holding period is completed.

[0017] The nickel-based electric heating alloy wire obtained by this preparation method has no defects such as folding, cracking, and warping on the surface. The finished product has a grain size of 6, a tensile strength of 635MPa, an elongation of 56%, a cross-sectional shrinkage rate of 79%, and a total inclusion rating of A+B+C+D of 0.5. Example 4

[0018] A method for preparing a nickel-based electric heating alloy wire, the specific steps are as follows: S1: Molten steel smelting: Electric furnace smelting + AOD furnace smelting + LF furnace refining are adopted, and the chemical composition of the molten steel is as follows by mass percentage: C: 0.03%, Si: 1.36%, Mn: 0.60%, P: 0.015%, S: 0.001%, Cr: 21.82%, Fe: 0.55%, Al: 0.25%, Ti: 0.20%, N: 0.0070%, Cu: 0.50%, and the rest is Ni and unavoidable impurities; S2: Continuous casting: The molten steel after LF refining is introduced into the tundish and continuously cast into billets through the casting machine. The continuous casting process parameters are: the temperature of the molten steel in the tundish is controlled at 30-45℃ above the melting point, the billet pulling speed is 0.7m / min, the vibration amplitude of the crystallizer is controlled at ±2.2mm, the negative slip time is controlled at 0.115s, and the water volume of the crystallizer is 120m 3 / h, secondary cooling water volume 73L / min, crystallizer and electromagnetic stirring at the end of solidification are put into use. The billet specifications produced by continuous casting are 220*220mm, there are no defects such as slag inclusions and cracks on the billet surface, the vibration mark depth is 0.22mm, and the billet cutting specifications are 220*220*3600mm; S3: Heating: The billet is loaded into a heating furnace for heating, wherein the furnace temperature of the heating section and the soaking section are controlled at 1190-1200°C, and the heating section and the soaking section time are 2.4h; S4: Initial rolling: high-pressure water is used to remove phosphorus and surface oxide scale on the heated square billet surface, and then the round initial rolling billet is obtained by rolling. The initial rolling is set to 9 passes, and the rolling temperature is controlled at 1120℃. The deformation of the first three passes is 13.85%, 14.12%, and 14.38%, respectively, and the strain rate is 2.15s -1 , 2.94s -1 、3.79s -1 , the total deformation of the first three passes was controlled at 36.92%; then the elliptical-round hole type was used to continue rolling, the pass elongation coefficient was controlled at 1.2-1.4, the rolling speed was controlled at 2.0-4.0m / s, the final rolling temperature was controlled at 960℃, and the billet specification after the initial rolling was 80mm; S5: Wire rolling: The round billet is subjected to electromagnetic induction heating, and then rolled into wire through rough rolling, intermediate rolling, pre-finishing rolling and finishing rolling, wherein the rough rolling inlet temperature is controlled at 1070°C, the final rolling temperature is controlled at 1050°C, the elongation coefficient of each pass of finishing rolling is controlled at 1.15-1.35, the final rolling speed is controlled at 58m / s, the wire laying temperature is controlled at 1020°C, and the wire is quickly water-cooled after laying. After the final rolling, the wire specification is φ5.5mm; S6: Offline solution treatment of wire rod: The wire rod is subjected to offline solution treatment, the solution temperature is controlled at 1060℃, the holding time is controlled at 60min, and the wire rod is taken out of the furnace and water-cooled after the holding period is completed.

[0019] The nickel-based electric heating alloy wire obtained by this preparation method has no defects such as folding, cracking, and warping on the surface. The finished product has a grain size of 5.5, a tensile strength of 649 MPa, an elongation of 57%, a cross-sectional shrinkage rate of 78%, and a total inclusion rating of A+B+C+D of 0.5.

[0020] In the continuous casting process of this method, by reasonably matching the pouring temperature, pulling speed, water volume in the crystallizer and vibration parameters, key process parameters such as the secondary cooling water ratio are optimized, and electromagnetic stirring is used in the crystallizer and at the end of solidification to avoid coarse columnar crystal structure inside the ingot. The proportion of equiaxed crystal zone in the core of the ingot can reach more than 30%, the segregation of dendrite elements in the ingot is reduced, the number and size of complex precipitated phases are reduced, the depth of vibration marks on the surface of the square billet is ≤0.25mm, and the continuous casting process can be used to stably produce nickel-based electric heating alloy continuous casting square billets with a specification of 220*220mm, and the surface of the square billet is free of defects such as slag inclusions and cracks.

[0021] The finished product obtained by implementing the preparation method has a grain size of 5-6, a tensile strength of 620-660 MPa, an elongation of ≥50%, a cross-sectional shrinkage of ≥75%, and a total inclusion rating of 0.5 for inclusions A+B+C+D.

Claims

1. A method for preparing a nickel-based electric heating alloy wire, characterized in that: The specific steps are as follows: S1: Molten steel smelting: Electric furnace smelting + AOD furnace smelting + LF furnace refining are used to produce molten steel that meets the chemical composition requirements; S2: Continuous casting: The molten steel after LF refining is introduced into the tundish and continuously cast into billets through the casting machine; S3: Heating: loading the billet into a heating furnace for heating; S4: Initial rolling: high-pressure water is used to remove phosphorus and surface oxide scale on the surface of the heated square billet, and then a round initial rolling billet is obtained by rolling; S5: Wire rolling: The round billet is subjected to electromagnetic induction heating, and then rolled into wire through rough rolling, intermediate rolling, pre-finishing rolling and finishing rolling; S6: Offline solution treatment of wire: The wire rod is subjected to offline solution treatment, the solution temperature is controlled at 1050±10℃, the insulation time is controlled at 45-75min, and after the insulation is completed, it is taken out of the furnace and water-cooled to improve the drawing performance of the wire.

2. The method for preparing a nickel-based electric heating alloy wire according to claim 1, characterized in that: The chemical composition of the molten steel obtained by smelting molten steel in step S1 is controlled by mass percentage as follows: C: 0.01-0.03%, Si: 0.75-1.60%, Mn≤0.60%, P≤0.020%, S≤0.010%, Cr: 20.0-23.0%, Fe≤1.0%, Al: 0.15-0.25%, Ti: 0.10-0.20%, N≤0.0070%, Cu≤0.50%, and the rest is Ni and unavoidable impurities.

3. The method for preparing a nickel-based electric heating alloy wire according to claim 1, characterized in that: The continuous casting process parameters in step S2 are: the temperature of the molten steel in the tundish is controlled at 25-45°C above the melting point, the casting speed is 0.70-0.90 m / min, the vibration amplitude of the crystallizer is controlled at ±2.2 mm, the negative slip time is controlled at 0.115 s, and the water volume of the crystallizer is 110-120 m 3 / h, secondary cooling water volume 65-75L / min, electromagnetic stirring is used in the crystallizer and the end of solidification.

4. The method for preparing a nickel-based electric heating alloy wire according to claim 1, characterized in that: During the heating process in step S3, the furnace temperatures of the heating section and the soaking section are controlled at 1180-1220° C., and the total time of the heating section and the soaking section is controlled at 2-2.5 hours.

5. The method for preparing a nickel-based electric heating alloy wire according to claim 1, characterized in that: In step S4, the initial rolling is set to 9 passes, the starting rolling temperature is controlled at 1080-1130°C, the first three passes are controlled at 10-15%, and the strain rate is controlled at 1.5-5.0s -1 The total deformation of the first three passes is controlled at 30-40%; then the elliptical-round hole type is used to continue rolling, the pass elongation coefficient is controlled at 1.2-1.4, the rolling speed is controlled at 2.0-4.0m / s, the final rolling temperature is controlled at ≥950℃, and the billet specification after the initial rolling is φ80-φ90mm.

6. The method for preparing a nickel-based electric heating alloy wire according to claim 1, characterized in that: In step S5, the rough rolling inlet temperature is controlled at 1030-1070°C, the final rolling temperature is controlled at 1050-1100°C, the elongation coefficient of each pass of the finishing rolling is controlled at 1.15-1.35, the final rolling speed is controlled at 50-60m / s, the spinning temperature is controlled at 1000-1050°C, and the spinning is quickly water-cooled after spinning.