A smelting method for an aluminum- and titanium-containing nickel-based alloy

Abstract

The invention discloses a smelting method of a nickel-based alloy containing aluminum and titanium. The method adopts the process steps of alloy melting furnace or electric furnace→AOD furnace→VOD furnace→LF refining to greatly reduce the contents of C, Si, S and N in the finished nickel-based alloy containing aluminum and titanium. The C content is reduced from the national standard chemical composition content C≤0.10% to C≤0.010%, the Si content is reduced from the national standard chemical composition content Si≤1.00% to Si≤0.20%, and the S content is reduced from the national standard chemical composition content S≤0. The content of S is reduced from 0.015% to S≤0.002%, and the content of N is reduced to N≤0.010%, which significantly improves the steel purity of the nickel-based alloy containing aluminum and titanium, and improves the performance of the nickel-based alloy containing aluminum and titanium. Moreover, by using the nickel-based alloy melt containing aluminum and titanium produced by the smelting method of the present invention as a raw material and using a wide-width vertical bending slab continuous casting machine for finished product casting, efficient and stable production can be achieved, and the continuous casting metal recovery rate is as high as 93-98%, which significantly improves the yield rate and production efficiency of the nickel-based alloy containing aluminum and titanium.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for smelting a nickel-based alloy containing aluminum and titanium. Background Art

[0002] Nickel-based alloys, especially precipitation-strengthened alloys, contain high levels of aluminum, titanium and other alloying elements. They have excellent heat resistance, corrosion resistance and good comprehensive mechanical properties. They are widely used in petrochemical, energy and power, industrial and household heating elements and other fields.

[0003] This nickel-based alloy containing aluminum and titanium is usually melted in a vacuum induction furnace and remelted in a vacuum consumable furnace or an electric slag furnace. The hot processing adopts casting and rolling processes. Its product quality is unstable, the steel purity is low, the production cost is high, and the yield rate and production efficiency are low, resulting in a prominent contradiction between supply and demand, which seriously restricts the widespread use and industrial production of this product.

[0004] Therefore, providing a new smelting method for nickel-based alloys containing aluminum and titanium to significantly improve steel purity, yield rate and production efficiency has become a technical problem that urgently needs to be solved in this field. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a method for smelting a nickel-based alloy containing aluminum and titanium, and the smelting method of the nickel-based alloy containing aluminum and titanium comprises the following steps:

[0006] (I) Raw material smelting

[0007] High carbon ferrochrome, chromium-nickel pig iron and ferronickel are used as raw materials of the nickel-based alloy containing aluminum and titanium, and the ingredients are prepared according to the national standard chemical composition content of the target product of the nickel-based alloy containing aluminum and titanium, and the high carbon ferrochrome, chromium-nickel pig iron and ferronickel are melted into molten steel by an alloy melting furnace or an electric furnace, wherein the national standard chemical composition content of the target product of the nickel-based alloy containing aluminum and titanium is as follows by mass percentage: C≤0.10%, Si≤1.00%, Mn≤1.50%, P≤0.045%, S≤0.015%, Cr: 19.0-23.0%, Ni: 30.0-35.0%, Al: 0.15-0.60%, Ti: 0.15-0.60%, and the rest is Fe and unavoidable impurities;

[0008] (II) AOD furnace smelting

[0009] The molten steel is poured into an AOD furnace for smelting. During the oxygen blowing and decarbonization process in the AOD furnace, ferronickel, nickel plates, and high-carbon ferrochrome are added for alloying. After decarbonization is completed, ferrosilicon is added for reduction for 12 - 15 minutes. After the reduction is completed, tapping is carried out. After tapping from the AOD furnace, slag skimming operation is performed to remove the slag in the ladle. The chemical composition content of the molten steel after tapping from the AOD furnace is controlled by mass percentage as follows: C: 0.50 - 0.60%, Si ≤ 0.20%, Mn ≤ 1.50%, P ≤ 0.045%, S ≤ 0.010%, Cr: 19.0 - 23.0%, Ni: 30.0 - 35.0%, N ≤ 0.010%, and the rest is Fe and unavoidable impurities;

[0010] (III) VOD furnace smelting

[0011] After slag skimming from the ladle, it is hoisted to the VOD furnace for smelting. After the VOD furnace is evacuated, oxygen blowing and decarbonization are carried out. The vacuum degree is controlled at 50 - 70 mbar. The oxygen blowing amount is calculated according to an oxygen utilization rate of 60 - 70%. The oxygen supply intensity is controlled at 23 - 25 m 3 / h / t, the lance position of the oxygen lance is controlled at 1200 - 1250 mm, the bottom blowing argon gas supply intensity of the ladle is controlled at 6 - 8 Nl / min / t. After the oxygen blowing and decarbonization is completed, it enters the boiling decarbonization stage. The vacuum degree is controlled at ≤ 2 mbar, the bottom blowing argon gas supply intensity of the ladle is controlled at 8 - 10 Nl / min / t, and the boiling decarbonization time is controlled at 30 - 35 minutes. After the boiling decarbonization is completed, it enters the reduction stage. The vacuum degree is controlled at ≤ 2 mbar, the bottom blowing argon gas supply intensity of the ladle is controlled at 8 - 10 Nl / min / t. The addition amount of the reducing agent is controlled as follows: aluminum pellets 18 - 20 kg / t, lime 22 - 25 kg / t, fluorite 6 - 8 kg / t, and the reduction time is controlled at 30 - 35 minutes. The chemical composition content of the molten steel after reduction in the VOD furnace is controlled by mass percentage as follows: C ≤ 0.010%, Si ≤ 0.20%, Mn ≤ 1.50%, P ≤ 0.045%, S ≤ 0.002%, Cr: 19.0 - 23.0%, Ni: 30.0 - 35.0%, Al: 0.15 - 0.60%, N ≤ 0.010%, and the rest is Fe and unavoidable impurities;

[0012] (IV) LF furnace refining

[0013] After reduction in the VOD furnace, the ladle is hoisted to the LF furnace. Ferrotitanium is added to the LF furnace for alloying. After alloying, argon is blown from the bottom of the ladle for stirring and temperature reduction. The argon supply intensity for bottom blowing of the ladle is controlled at 6 - 8 Nl / min / t. When the molten steel temperature reaches 1420 - 1430 °C, the refining process in the LF furnace ends. After the refining process in the LF furnace ends, the chemical composition content of the molten steel is controlled by mass percentage as follows: C ≤ 0.010%, Si ≤ 0.20%, Mn ≤ 1.50%, P ≤ 0.045%, S ≤ 0.002%, Cr: 19.0 - 23.0%, Ni: 30.0 - 35.0%, Al: 0.15 - 0.60%, Ti: 0.15 - 0.60%, N ≤ 0.010%, and the rest is Fe and inevitable impurities.

[0014] Furthermore, in the smelting method of the aluminum and titanium containing nickel - based alloy of the present invention, in the AOD furnace smelting step, when alloying, the recovery rate of Cr is controlled at 94 - 96% and the recovery rate of Ni is controlled at 97 - 99%; when reducing, the addition amount of ferrosilicon is controlled at 20 - 24 kg / t, where t is the weight of the molten steel in tons; when slag - skimming operation is carried out, the thickness of the ladle slag is controlled at ≤ 50 mm.

[0015] Furthermore, in the smelting method of the aluminum and titanium containing nickel - based alloy of the present invention, in the LF furnace refining step, when alloying, the recovery rate of Ti is controlled at 78 - 82%.

[0016] Furthermore, in the smelting method of the aluminum and titanium containing nickel - based alloy of the present invention, the aluminum and titanium containing nickel - based alloy is N08800 alloy, and:

[0017] In the AOD furnace smelting step, the chemical composition content of the molten steel after tapping from the AOD furnace is controlled by mass percentage as follows: C: 0.55%, Si: 0.11%, Mn: 0.20%, P: 0.030%, S: 0.005%, Cr: 20.5%, Ni: 30.6%, N: 0.009%, and the rest is Fe and inevitable impurities;

[0018] In the VOD furnace smelting step, the chemical composition content of the molten steel after reduction in the VOD furnace is controlled by mass percentage as follows: C: 0.006%, Si: 0.13%, Mn: 0.20%, P: 0.031%, S: 0.001%, Cr: 20.4%, Ni: 30.5%, Al: 0.31%, N: 0.008%, and the rest is Fe and inevitable impurities;

[0019] In the LF furnace refining step, after the LF furnace refining treatment, the chemical composition content of the molten steel is controlled by mass percentage as follows: C: 0.007%, Si: 0.14%, Mn: 0.20%, P: 0.030%, S: 0.001%, Cr: 20.4%, Ni: 30.5%, Al: 0.29%, Ti: 0.30%, N: 0.008%, and the rest is Fe and inevitable impurities.

[0020] Furthermore, in the smelting method of the aluminum- and titanium-containing nickel-based alloy of the present invention:

[0021] In the AOD furnace smelting step, when performing reduction, the addition amount of ferrosilicon is 21.5 kg / t, and the thickness of the ladle slag during slag skimming operation is 45 mm;

[0022] In the VOD furnace smelting step, during oxygen blowing for decarburization, the vacuum degree is 56 mbar, the oxygen blowing amount is calculated according to an oxygen utilization rate of 64%, the oxygen supply intensity is 24.1 m3 / h / t, the lance position of the oxygen lance is 1202 mm, and the bottom blowing argon gas supply intensity of the ladle is 6.4 Nl / min / t; during the boiling decarburization stage, the vacuum degree is 1.5 mbar, the bottom blowing argon gas supply intensity of the ladle is 8.6 Nl / min / t, and the boiling decarburization time is 32 min; during the reduction stage, the vacuum degree is 1.4 mbar, the bottom blowing argon gas supply intensity of the ladle is 8.5 Nl / min / t, the addition amount of aluminum pellets is 19.1 kg / t, the addition amount of lime is 23.5 kg / t, the addition amount of fluorite is 6.4 kg / t, and the reduction time is 33 min;

[0023] In the LF furnace refining step, during alloying, the recovery rate of Ti is 81%, the bottom blowing argon gas supply intensity of the ladle is 6.6 Nl / min / t, and when the temperature of the molten steel reaches 1424 °C, the LF furnace refining ends.

[0024] The smelting method of the aluminum- and titanium-containing nickel-based alloy of the present invention has the following advantages and beneficial effects:

[0025] The smelting method of the aluminum- and titanium-containing nickel-based alloy of the present invention adopts the technological links of alloy melting furnace or electric furnace → AOD furnace → VOD furnace → LF ladle refining, which greatly reduces the contents of C, Si, S, and N in the finished product of the aluminum- and titanium-containing nickel-based alloy, making the C content decrease from the national standard chemical composition content C ≤ 0.10% to C ≤ 0.010%, the Si content decrease from the national standard chemical composition content Si ≤ 1.00% to Si ≤ 0.20%, the S content decrease from the national standard chemical composition content S ≤ 0.015% to S ≤ 0.002%, and the N content decrease to N ≤ 0.010%. It can significantly improve the steel purity of the aluminum- and titanium-containing nickel-based alloy and enhance the performance of the aluminum- and titanium-containing nickel-based alloy.

[0026] Moreover, by using the aluminum- and titanium-containing nickel-based alloy melt produced by the aluminum- and titanium-containing nickel-based alloy smelting method of the present invention as a raw material and using a wide-width vertical bending slab continuous casting machine for finished product casting, efficient and stable production can be achieved, and the continuous casting metal yield rate is as high as 93% to 98%, which significantly improves the yield rate and production efficiency of the aluminum- and titanium-containing nickel-based alloy. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] The smelting method of the nickel-based alloy containing aluminum and titanium of the present invention comprises the following steps:

[0029] (I) Raw material smelting

[0030] High carbon ferrochrome, chromium-nickel pig iron and ferronickel are used as raw materials of a nickel-based alloy containing aluminum and titanium, and the ingredients are prepared according to the national standard chemical composition content of the target product of the nickel-based alloy containing aluminum and titanium, and the high carbon ferrochrome, chromium-nickel pig iron and ferronickel are melted into molten steel through an alloy melting furnace or an electric furnace, wherein the national standard chemical composition content of the target product of the nickel-based alloy containing aluminum and titanium is as follows by mass percentage: C≤0.10%, Si≤1.00%, Mn≤1.50%, P≤0.045%, S≤0.015%, Cr: 19.0-23.0%, Ni: 30.0-35.0%, Al: 0.15-0.60%, Ti: 0.15-0.60%, and the rest is Fe and unavoidable impurities;

[0031] (II) AOD furnace smelting

[0032] The molten steel is poured into an AOD furnace for smelting. During the oxygen blowing and decarbonization process in the AOD furnace, ferronickel, nickel plates, and high-carbon ferrochrome are added for alloying. After decarbonization, ferrosilicon is added for reduction for 12 - 15 minutes. After the reduction is completed, tapping is carried out. After tapping from the AOD furnace, slag skimming operation is carried out to remove the slag in the ladle, and the thickness of the ladle slag is controlled to be ≤50 mm. Among them, during alloying, the recovery rate of Cr is controlled at 94 - 96%, and the recovery rate of Ni is controlled at 97 - 99%. During reduction, the addition amount of ferrosilicon is controlled at 20 - 24 kg / t, where t is the weight of the molten steel (tons). The chemical composition content of the molten steel after tapping from the AOD furnace is controlled by mass percentage as follows: C: 0.50 - 0.60%, Si ≤ 0.20%, Mn ≤ 1.50%, P ≤ 0.045%, S ≤ 0.010%, Cr: 19.0 - 23.0%, Ni: 30.0 - 35.0%, N ≤ 0.010%, and the rest are Fe and inevitable impurities;

[0033] (III) VOD Furnace Smelting

[0034] After the ladle slag is skimmed, it is hoisted to the VOD furnace for smelting. After the VOD furnace is evacuated, oxygen is blown for decarbonization. The vacuum degree is controlled at 50 - 70 mbar. The oxygen blowing amount is calculated according to the oxygen utilization rate of 60 - 70%. The oxygen supply intensity is controlled at 23 - 25 m 3 / h / t, the lance position of the oxygen lance is controlled at 1200 - 1250 mm, and the bottom blowing argon gas supply intensity of the ladle is controlled at 6 - 8 Nl / min / t. After the oxygen blowing and decarbonization is completed, it enters the boiling decarbonization stage. The vacuum degree is controlled at ≤2 mbar, and the bottom blowing argon gas supply intensity of the ladle is controlled at 8 - 10 Nl / min / t. The boiling decarbonization time is controlled at 30 - 35 minutes. After the boiling decarbonization is completed, it enters the reduction stage. The vacuum degree is controlled at ≤2 mbar, and the bottom blowing argon gas supply intensity of the ladle is controlled at 8 - 10 Nl / min / t. The addition amount of the reducing agent is controlled as follows: aluminum pellets 18 - 20 kg / t, lime 22 - 25 kg / t, fluorite 6 - 8 kg / t. The reduction time is controlled at 30 - 35 minutes, where t is the weight of the molten steel (tons). The chemical composition content of the molten steel after reduction in the VOD furnace is controlled by mass percentage as follows: C ≤ 0.010%, Si ≤ 0.20%, Mn ≤ 1.50%, P ≤ 0.045%, S ≤ 0.002%, Cr: 19.0 - 23.0%, Ni: 30.0 - 35.0%, Al: 0.15 - 0.60%, N ≤ 0.010%, and the rest are Fe and inevitable impurities;

[0035] (IV) LF Furnace Refining

[0036] After reduction in the VOD furnace, the ladle is hoisted to the LF furnace, and titanium iron is added to the LF furnace for alloying. The yield of Ti during alloying is controlled at 78-82%. After alloying, the ladle is bottom blown for stirring and cooling, and the argon supply intensity of the ladle bottom blowing is controlled to be 6-8Nl / min / t, wherein t is the weight of the molten steel (ton). When the molten steel temperature reaches 1420-1430°C, the LF furnace refining treatment is completed. After the LF furnace refining treatment is completed, the chemical composition content of the molten steel is controlled by mass percentage as follows: C≤0.010%, Si≤0.20%, Mn≤1.50%, P≤0.045%, S≤0.002%, Cr: 19.0-23.0%, Ni: 30.0-35.0%, Al: 0.15-0.60%, Ti: 0.15-0.60%, N≤0.010%, and the rest is Fe and unavoidable impurities.

[0037] Therefore, by using the smelting method of the nickel-based alloy containing aluminum and titanium of the present invention, the contents of C, Si, S and N in the finished nickel-based alloy containing aluminum and titanium can be greatly reduced, so that the C content is reduced from the national standard chemical composition content C≤0.10% to C≤0.010%, the Si content is reduced from the national standard chemical composition content Si≤1.00% to Si≤0.20%, the S content is reduced from the national standard chemical composition content S≤0.015% to S≤0.002%, and the N content is reduced to N≤0.010%, thereby significantly improving the steel purity of the nickel-based alloy containing aluminum and titanium.

[0038] Moreover, by using the aluminum- and titanium-containing nickel-based alloy melt produced by the aluminum- and titanium-containing nickel-based alloy smelting method of the present invention as a raw material and using a wide-width vertical bending slab continuous casting machine for finished product casting, efficient and stable production can be achieved, and the continuous casting metal yield rate is as high as 93% to 98%, which significantly improves the yield rate and production efficiency of the aluminum- and titanium-containing nickel-based alloy.

[0039] The smelting method of the nickel-based alloy containing aluminum and titanium of the present invention is described in detail below in conjunction with specific embodiments.

[0040] Example 1

[0041] In Example 1 of the present invention, the nickel-based alloy containing aluminum and titanium is N08800 alloy. The smelting method of the nickel-based alloy containing aluminum and titanium in Example 1 of the present invention comprises the following steps:

[0042] (1) Molten high-carbon ferrochrome, ferrochrome-nickel pig iron, and ferronickel are melted into molten steel in an alloy melting furnace. Among them, the national standard chemical composition content of the N08800 alloy target product is by mass percentage: C ≤ 0.10%, Si ≤ 1.00%, Mn ≤ 1.50%, P ≤ 0.045%, S ≤ 0.015%, Cr: 19.0 - 23.0%, Ni: 30.0 - 35.0%, Al: 0.15 - 0.60%, Ti: 0.15 - 0.60%, and the rest are Fe and inevitable impurities;

[0043] (2) Pour the molten steel into an AOD furnace for smelting. During the oxygen-blowing decarburization process in the AOD furnace, ferronickel, nickel plates, and high-carbon ferrochrome are added for alloying. After decarburization is completed, ferrosilicon is added for reduction for 12 - 15 minutes. The addition amount of ferrosilicon is 21.5 kg / t. After reduction is completed, tapping is carried out. After tapping from the AOD furnace, slag skimming operation is carried out to remove the molten slag in the ladle. The thickness of the ladle slag is 45 mm. The chemical composition content of the molten steel after tapping from the AOD furnace is controlled by mass percentage as follows: C: 0.55%, Si: 0.11%, Mn: 0.20%, P: 0.030%, S: 0.005%, Cr: 20.5%, Ni: 30.6%, N: 0.009%, and the rest are Fe and inevitable impurities;

[0044] (3) After slag skimming from the ladle, it is hoisted to a VOD furnace for smelting. After the VOD furnace evacuates, oxygen-blowing decarburization is carried out. The vacuum degree is 56 mbar. The blowing oxygen amount is calculated according to an oxygen utilization rate of 64%. The oxygen supply intensity is 24.1 m 3 / h / t, the lance position of the oxygen lance is 1202 mm, the bottom blowing argon gas supply intensity of the ladle is 6.4 Nl / min / t. After the oxygen-blowing decarburization is completed, it enters the boiling decarburization stage. The vacuum degree is 1.5 mbar, the bottom blowing argon gas supply intensity of the ladle is 8.6 Nl / min / t, and the boiling decarburization time is 32 minutes. After the boiling decarburization is completed, it enters the reduction stage. The vacuum degree is 1.4 mbar, the bottom blowing argon gas supply intensity of the ladle is 8.5 Nl / min / t. The addition amount of aluminum pellets is 19.1 kg / t, the addition amount of lime is 23.5 kg / t, the addition amount of fluorite is 6.4 kg / t, and the reduction time is 33 minutes. The chemical composition content of the molten steel after reduction in the VOD furnace is controlled by mass percentage as follows: C: 0.006%, Si: 0.13%, Mn: 0.20%, P: 0.031%, S: 0.001%, Cr: 20.4%, Ni: 30.5%, Al: 0.31%, N: 0.008%, and the rest are Fe and inevitable impurities;

[0045] (IV) After reduction in the VOD furnace, the ladle is hoisted to the LF furnace, and ferrotitanium is added to the LF furnace for alloying. The recovery rate of Ti is 81%. After alloying, the ladle is bottom blown for stirring and cooling. The argon supply intensity of the ladle bottom blowing is 6.6Nl / min / t. When the molten steel temperature reaches 1424°C, the LF furnace refining treatment is completed. After the LF furnace refining treatment is completed, the chemical composition content of the molten steel is controlled by mass percentage as follows: C: 0.007%, Si: 0.14%, Mn: 0.20%, P: 0.030%, S: 0.001%, Cr: 20.4%, Ni: 30.5%, Al: 0.29%, Ti: 0.30%, N: 0.008%, and the rest is Fe and unavoidable impurities.

[0046] By using the smelting method of the nickel-based alloy containing aluminum and titanium of Example 1 of the present invention, the C content in the N08800 alloy can be reduced from the national standard chemical composition content C≤0.10% to 0.007%, the Si content can be reduced from the national standard chemical composition content Si≤1.00% to 0.14%, the S content can be reduced from the national standard chemical composition content S≤0.015% to 0.001%, and the N content can be reduced to 0.008%, thereby significantly improving the steel purity of the N08800 alloy and enhancing the performance of the N08800 alloy.

[0047] Moreover, by using the N08800 alloy produced by the smelting method of the nickel-based alloy containing aluminum and titanium of the present invention as raw material and using a wide-width vertical bending slab continuous casting machine for finished product casting, efficient and stable production can be achieved, and the continuous casting metal yield rate reaches 97%, which significantly improves the yield rate and production efficiency of the N08800 alloy.

[0048] In summary, compared with the prior art, the smelting method of the nickel-based alloy containing aluminum and titanium of the present invention has the following advantages and beneficial effects:

[0049] The smelting method of the nickel-based alloy containing aluminum and titanium of the present invention adopts the process steps of alloy melting furnace or electric furnace→AOD furnace→VOD furnace→LF ladle refining, which greatly reduces the contents of C, Si, S and N in the finished nickel-based alloy containing aluminum and titanium, so that the C content is reduced from the national standard chemical composition content C≤0.10% to C≤0.010%, the Si content is reduced from the national standard chemical composition content Si≤1.00% to Si≤0.20%, the S content is reduced from the national standard chemical composition content S≤0.015% to S≤0.002%, and the N content is reduced to N≤0.010%, which can significantly improve the steel purity of the nickel-based alloy containing aluminum and titanium, and improve the performance of the nickel-based alloy containing aluminum and titanium.

[0050] Moreover, by using the aluminum- and titanium-containing nickel-based alloy melt produced by the aluminum- and titanium-containing nickel-based alloy smelting method of the present invention as a raw material and using a wide-width vertical bending slab continuous casting machine for finished product casting, efficient and stable production can be achieved, and the continuous casting metal yield rate is as high as 93% to 98%, which significantly improves the yield rate and production efficiency of the aluminum- and titanium-containing nickel-based alloy.

[0051] It should be noted that, in this article, the term "comprise" or any other variation thereof is intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such article or device.

[0052] It should also be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the present invention.

Claims

1. A smelting method for an aluminum- and titanium-containing nickel-based alloy, characterized in that, the smelting method for the aluminum- and titanium-containing nickel-based alloy comprises the following steps: (I) Raw material melting Using high-carbon ferrochrome, chrome-nickel pig iron, and ferronickel as raw materials for the aluminum- and titanium-containing nickel-based alloy, batching according to the national standard chemical composition content of the target product of the aluminum- and titanium-containing nickel-based alloy, and melting high-carbon ferrochrome, chrome-nickel pig iron, and ferronickel into molten steel in an alloy melting furnace. Among them, the national standard chemical composition content of the target product of the aluminum- and titanium-containing nickel-based alloy is by mass percentage: C ≤ 0.10%, Si ≤ 1.00%, Mn ≤ 1.50%, P ≤ 0.045%, S ≤ 0.015%, Cr: 19.0 - 23.0%, Ni: 30.0 - 35.0%, Al: 0.15 - 0.60%, Ti: 0.15 - 0.60%, and the rest are Fe and unavoidable impurities; (II) AOD furnace smelting Pour the molten steel into an AOD furnace for smelting. During the oxygen blowing and decarburization process in the AOD furnace, add ferronickel, nickel plates, and high-carbon ferrochrome for alloying. After decarburization, add ferrosilicon for reduction for 12 - 15 minutes, and tap the steel after the reduction ends. After tapping the steel from the AOD furnace, perform slag skimming operation to remove the steel slag in the ladle. The chemical composition content of the molten steel after tapping the steel from the AOD furnace is controlled by mass percentage as: C: 0.50 - 0.60%, Si ≤ 0.20%, Mn ≤ 1.50%, P ≤ 0.045%, S ≤ 0.010%, Cr: 19.0 - 23.0%, Ni: 30.0 - 35.0%, N ≤ 0.010%, and the rest are Fe and unavoidable impurities; (III) VOD furnace smelting The ladle is hoisted to the VOD furnace for smelting after slag skimming. After the VOD furnace evacuates to vacuum, oxygen blowing for decarburization is carried out. The vacuum degree is controlled at 50 - 70 mbar. The oxygen blowing amount is calculated according to an oxygen utilization rate of 60 - 70%, and the oxygen supply intensity is controlled at 23 - 25 m 3 / h / t. The lance position of the oxygen lance is controlled at 1200 - 1250 mm. The bottom blowing argon gas supply intensity of the ladle is controlled at 6 - 8 Nl / min / t. After the oxygen blowing for decarburization, it enters the boiling decarburization stage. The vacuum degree is controlled at ≤2 mbar. The bottom blowing argon gas supply intensity of the ladle is controlled at 8 - 10 Nl / min / t. The boiling decarburization time is controlled at 30 - 35 min. After the boiling decarburization, it enters the reduction stage. The vacuum degree is controlled at ≤2 mbar. The bottom blowing argon gas supply intensity of the ladle is controlled at 8 - 10 Nl / min / t. The addition amount of the reducing agent is controlled as follows: 18 - 20 kg / t of aluminum pellets, 22 - 25 kg / t of lime, and 6 - 8 kg / t of fluorite. The reduction time is controlled at 30 - 35 min. The chemical composition content of the molten steel after reduction in the VOD furnace is controlled by mass percentage as follows: C ≤ 0.010%, Si ≤ 0.20%, Mn ≤ 1.50%, P ≤ 0.045%, S ≤ 0.002%, Cr: 19.0 - 23.0%, Ni: 30.0 - 35.0%, Al: 0.15 - 0.60%, N ≤ 0.010%, and the rest is Fe and inevitable impurities; (IV) LF furnace refining After reduction in the VOD furnace, lift the ladle to the LF furnace. Add ferrotitanium for alloying in the LF furnace. After alloying, blow argon at the bottom of the ladle for stirring and cooling. The argon supply intensity at the bottom of the ladle is controlled at 6 - 8 Nl / min / t. When the molten steel temperature reaches 1420 - 1430 °C, the refining treatment in the LF furnace ends. The chemical composition content of the molten steel after the refining treatment in the LF furnace is controlled by mass percentage as: C ≤ 0.010%, Si ≤ 0.20%, Mn ≤ 1.50%, P ≤ 0.045%, S ≤ 0.002%, Cr: 19.0 - 23.0%, Ni: 30.0 - 35.0%, Al: 0.15 - 0.60%, Ti: 0.15 - 0.60%, N ≤ 0.010%, and the rest are Fe and unavoidable impurities.

2. The smelting method for the aluminum- and titanium-containing nickel-based alloy according to claim 1, characterized in that, in the AOD furnace smelting step, when alloying, the recovery rate of Cr is controlled at 94 - 96%, and the recovery rate of Ni is controlled at 97 - 99%; when reducing, the addition amount of ferrosilicon is controlled at 20 - 24 kg / t, where t is the weight of the molten steel in tons; during the slag skimming operation, the thickness of the ladle slag is controlled at ≤ 50 mm.

3. The smelting method for the aluminum- and titanium-containing nickel-based alloy according to claim 2, characterized in that, in the LF furnace refining step, when alloying, the recovery rate of Ti is controlled at 78 - 82%.

4. The smelting method of the nickel-based alloy containing aluminum and titanium as described in claim 1, characterized in that, the nickel-based alloy containing aluminum and titanium is N08800 alloy, and: In the AOD furnace smelting step, the chemical composition content of the molten steel after tapping from the AOD furnace is controlled by mass percentage as follows: C: 0.55%, Si: 0.11%, Mn: 0.20%, P: 0.030%, S: 0.005%, Cr: 20.5%, Ni: 30.6%, N: 0.009%, and the rest is Fe and inevitable impurities; In the VOD furnace smelting step, the chemical composition content of the molten steel after reduction in the VOD furnace is controlled by mass percentage as follows: C: 0.006%, Si: 0.13%, Mn: 0.20%, P: 0.031%, S: 0.001%, Cr: 20.4%, Ni: 30.5%, Al: 0.31%, N: 0.008%, and the rest is Fe and inevitable impurities; In the LF furnace refining step, the chemical composition content of the molten steel after the LF furnace refining treatment is controlled by mass percentage as follows: C: 0.007%, Si: 0.14%, Mn: 0.20%, P: 0.030%, S: 0.001%, Cr: 20.4%, Ni: 30.5%, Al: 0.29%, Ti: 0.30%, N: 0.008%, and the rest is Fe and inevitable impurities.

5. The smelting method of the nickel-based alloy containing aluminum and titanium as described in claim 4, characterized in that: In the AOD furnace smelting step, the addition amount of ferrosilicon during reduction is 21.5 kg / t, and the thickness of the ladle slag during slag skimming operation is 45 mm; In the VOD furnace smelting step, the vacuum degree during oxygen blowing for decarburization is 56 mbar, the oxygen blowing amount is calculated according to an oxygen utilization rate of 64%, the oxygen supply intensity is 24.1 m3 / h / t, the oxygen lance position is 1202 mm, and the bottom blowing argon gas supply intensity of the ladle is 6.4 Nl / min / t; the vacuum degree during the boiling decarburization stage is 1.5 mbar, the bottom blowing argon gas supply intensity of the ladle is 8.6 Nl / min / t, and the boiling decarburization time is 32 min; the vacuum degree during the reduction stage is 1.4 mbar, the bottom blowing argon gas supply intensity of the ladle is 8.5 Nl / min / t, the addition amount of aluminum pellets is 19.1 kg / t, the addition amount of lime is 23.5 kg / t, the addition amount of fluorite is 6.4 kg / t, and the reduction time is 33 min; In the LF furnace refining step, the recovery rate of Ti during alloying is 81%, the bottom blowing argon gas supply intensity of the ladle is 6.6 Nl / min / t, and when the molten steel temperature reaches 1424 °C, the LF furnace refining ends.