High-performance alloy material and preparation method thereof

Abstract

The invention provides a high-performance alloy material and a preparation method thereof, and relates to the technical field of alloy materials and preparation processes thereof, and based on the total weight of the high-performance alloy material, the high-performance alloy material comprises: 0.12-0.18% of carbon; silicon in an amount of 0.8 to 1.2%; manganese with a ratio of 0.5 to 0.8%; nickel in an amount of 3.5 to 4.5%; molybdenum with a ratio of 0.4 to 0.6%; chromium in a ratio of 9.0 to 10.5%; titanium in an amount of 0.05 to 0.15%; aluminum in an amount of 0.03 to 0.08%; and the balance of iron and inevitable impurities. In the smelting link, high-purity raw materials are selected and sequentially added into an electric arc furnace according to the proportion, low current is firstly conducted for low-speed smelting, the temperature is increased to 1550-1600 DEG C after a molten pool is formed, refining is conducted for 30-40 minutes, argon is blown in during the period, stirring and impurity removing are conducted, and the components are made to be uniform; the 15NiMoSiCr10 alloy material is a high-performance alloy material, the comprehensive performance of the alloy is remarkably improved by precisely regulating and controlling chemical components and combining an innovative preparation technology, and the problems that when the 15NiMoSiCr10 alloy is prepared, the performance of the 15NiMoSiCr10 alloy does not reach an ideal state under the condition of original components and a conventional machining technology, and leading-edge industrial requirements are difficult to meet are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of alloy materials and preparation processes thereof, and in particular to a high-performance alloy material and a preparation method thereof. Background Art

[0002] In the modern industrial field, such as petrochemical, marine engineering, power generation equipment manufacturing and other harsh working conditions, extremely high requirements are placed on the mechanical properties, corrosion resistance and high temperature resistance of materials. Traditional alloy materials often find it difficult to take into account multiple excellent properties. Under the synergistic effects of complex stress, strong corrosive media and high temperature, fatigue cracking, corrosion failure and other problems are prone to occur, which seriously affect the operating life and safety of equipment. 15NiMoSiCr10 alloy itself has certain potential, and its alloy elements such as nickel and chromium give basic strength and corrosion resistance.

[0003] During the preparation of 15NiMoSiCr10 alloy, its performance does not reach the ideal state under the original composition and conventional processing technology, and it is difficult to meet the needs of cutting-edge industry. Summary of the invention

[0004] The disclosed embodiments relate to a high-performance alloy material and a preparation method thereof, in order to solve the problem that during the preparation of 15NiMoSiCr10 alloy, its performance does not reach an ideal state under the original composition and conventional processing technology, and it is difficult to meet the needs of cutting-edge industries.

[0005] In a first aspect of the present disclosure, a high-performance alloy material and a preparation method thereof are provided. The high-performance alloy material comprises, based on the total weight of the high-performance alloy material: 0.12-0.18% carbon; 0.8-1.2% silicon; 0.5-0.8% manganese; 3.5-4.5% nickel; 0.4-0.6% molybdenum; 9.0-10.5% chromium; 0.05-0.15% titanium; 0.03-0.08% aluminum; and the remainder of iron and unavoidable impurities.

[0006] At least some embodiments include a smelting step: high-purity raw materials are selected and added into an electric arc furnace in order according to the proportions, firstly melted at a low current and at a low speed, and after a molten pool is formed, the temperature is raised to 1550-1600°C and refined for 30-40 minutes, during which argon is blown in for stirring and removing impurities to make the composition uniform, and titanium and aluminum intermediate alloys are added at the end of refining to fine-tune the composition.

[0007] At least some embodiments further include a casting step: after refining, the molten steel is poured into a sand mold preheated to 300-400°C, and the casting speed is controlled at 2-3kg / s to ensure complete molding and internal density. After demolding, the casting is air-cooled to 500°C, and then slowly cooled to room temperature in a furnace to reduce thermal stress.

[0008] At least some embodiments further include heat treatment: the billet is heated to 1050-1100°C, kept warm for 1-2 hours, and subjected to multiple hot rolling passes with a single-pass reduction rate of 15-20%, a cumulative deformation of more than 60%, and grain refinement; after final rolling, the billet is immediately water quenched to room temperature for solid solution strengthening; and then tempered at 650-700°C for 2-3 hours to eliminate residual stress and precipitate a dispersed strengthening phase.

[0009] At least some embodiments include: an electric arc furnace, a support plate fixedly connected to the top of the electric arc furnace, an upper support platform fixedly connected in the middle of the support plate, the upper support platform is a hollow structure, a stirring drive member fixedly connected to the top of the upper support platform, the rotating shaft of the stirring drive member is fixedly connected to a tubular stirring shaft, the tubular stirring shaft is rotatably connected to the upper support platform through bearings and sealing rings, a one-way air valve is installed inside the tubular stirring shaft, the upper support platform is a cavity structure, an argon gas input pipe is installed on the upper support platform, the lower end of the tubular stirring shaft is fixedly connected to a stirring disk, access pipes are distributed on the periphery of the stirring disk, a blade sheath is sleeved on the access pipe, and strip air permeable bricks are installed on the blade sheath.

[0010] In at least some embodiments, an argon inlet hole is provided on the upper end wall of the tubular stirring shaft, and the argon inlet hole is located inside the upper support platform. An outer insulating sleeve and an inner insulating sleeve are sleeved on the lower end of the tubular stirring shaft.

[0011] In at least some embodiments, two insulation corrugated connecting plates are fixedly connected to the inner wall of the inner insulation sleeve, the insulation corrugated connecting plates are corrugated structures, the one-way air valve is located between the two insulation corrugated connecting plates, and the air inlet end of the one-way air valve faces upward.

[0012] In at least some embodiments, the stirring disk is a hollow structure, the upper end of the stirring disk is fixedly connected to an access pipe, the access pipe is fixedly connected to the lower ends of the outer insulation sleeve and the inner insulation sleeve, the stirring disk is distributed with stirring blades on the periphery, the stirring blades are hollow structures, the interior of the stirring blades is connected to the inner cavity of the stirring disk, and argon gas discharge holes are opened on the stirring blades.

[0013] In at least some embodiments, the blade sheath is provided with an assembly socket, an inner wall of the assembly socket is provided with an assembly slot, and the assembly slot is located outside the argon gas discharge hole.

[0014] In at least some embodiments, a strip-shaped air-permeable brick is movably connected inside the assembly socket, and a guide strip is processed on the edge of the strip-shaped air-permeable brick, and the guide strip is inserted into the assembly slot.

[0015] The present invention provides a high-performance alloy material and a preparation method thereof, which has the following beneficial effects: The 15NiMoSiCr10 alloy material in the present invention is a high-performance alloy material. By precisely controlling the chemical composition and combining it with an innovative preparation process, the comprehensive performance of the alloy is significantly improved.

[0016] In addition, 15NiMoSiCr10 alloy material is suitable for key connectors in petrochemical pipeline systems. It can withstand erosion corrosion and high pressure stress of complex media inside the pipeline with its excellent corrosion resistance and high strength. On offshore platform structural parts, it can withstand long-term immersion in seawater, wave impact and erosion by marine microorganisms. It can also be used as high-temperature components of gas turbines. Relying on its high temperature resistance and creep resistance, it maintains dimensional stability and mechanical properties under high temperature conditions, ensuring efficient and safe operation of equipment.

[0017] In addition, through the cooperation of the stirring drive and the tubular stirring shaft, the stirring drive drives the tubular stirring shaft to drive the stirring disk to rotate, so that the inside of the molten pool can be stirred to promote the mixing of the metal components inside the molten pool; at the same time, argon gas is input into the upper support through the argon gas input pipe, and the argon gas passes through the argon gas inlet hole, the access pipe, and the stirring disk into the stirring blade, and is discharged into the molten pool through the argon gas discharge hole, so that the stirring blade rotates to stir the alloy melt while releasing argon gas, so that the argon gas can be more evenly distributed in the alloy melt, and fully mixed with the alloy melt, thereby improving the argon blowing effect.

[0018] In addition, a blade sheath is connected to the outer surface of the stirring blade, and a strip air-permeable brick is arranged outside the blade sheath. The strip air-permeable brick is fixed to the outside of the argon gas discharge hole through the blade sheath and fits tightly therewith. When the argon gas is discharged through the argon gas discharge hole, the gas passes through the strip air-permeable brick, so that the gas is further dispersed into tiny bubbles, and under the action of the strip air-permeable brick, the alloy melt is prevented from entering the interior of the argon gas discharge hole and causing blockage. At the same time, a one-way air valve is arranged to maintain a certain air pressure inside the stirring disk, thereby reducing the probability of the alloy melt penetrating into the interior of the argon gas discharge hole under the action of hydraulic pressure and causing blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0020] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0021] In the attached picture: Figure 1 The figure shows the composition ratio of the alloy material of the first embodiment of the present application; Figure 2 The figure shows the composition ratio of the alloy material of the second embodiment of the present application; Figure 3 The schematic diagram of the structure of the electric arc furnace of the present application is shown; Figure 4 The schematic diagram of the structure of the upper support platform of the present application is shown; Figure 5 The schematic diagram of the structure inside the upper support platform of the present application is shown; Figure 6 The schematic diagram of the structure of the stirring plate of the present application is shown; Figure 7 A schematic diagram of the structure of the blade sheath of the present application is shown; Figure 8 This application shows Figure 5 A schematic diagram of the partially enlarged structure at point A in the middle; Fig. 9 This application shows Figure 5 A schematic diagram of the partially enlarged structure at B in the middle; Fig.10 This application shows Figure 5 A schematic diagram of the partially enlarged structure at C in the middle; Fig.11 This application shows Figure 6 Schematic diagram of the partially enlarged structure at point D in the middle.

[0022] Reference numerals list 1. Electric arc furnace; 101. Support plate; 2. Upper support platform; 3. Stirring drive; 4. Argon inlet pipe; 5. Tubular stirring shaft; 501. Argon inlet hole; 502. Outer insulation sleeve; 503. Inner insulation sleeve; 504. Insulating corrugated connecting plate; 6. One-way air valve; 7. Stirring disk; 701. Access pipe; 702. Stirring blade; 703. Argon outlet hole; 8. Blade sheath; 801. Assembly socket; 802. Assembly slot; 9. Strip air brick; 901. Guide insert. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example 1: Please refer to Figures 1 to 11 : The present invention proposes a high-performance alloy material and a preparation method thereof. Based on the total weight of the high-performance alloy material, the high-performance alloy material includes: 0.12-0.18% carbon; 0.8-1.2% silicon; 0.5-0.8% manganese; 3.5-4.5% nickel; 0.4-0.6% molybdenum; 9.0-10.5% chromium; 0.05-0.15% titanium; 0.03-0.08% aluminum; and the remainder of iron and unavoidable impurities; including a smelting step: selecting high-purity raw materials, adding them into an electric arc furnace in sequence according to a ratio, first passing a small current for low-speed melting, and then raising the temperature to 1550-1600°C to form a molten pool and refining for 30-40 minutes, during which argon is blown into the furnace. Air stirring is used to remove impurities and promote uniform composition. Titanium and aluminum intermediate alloys are added at the end of refining to fine-tune the composition. The casting step is also included: after refining, the molten steel is cast into a sand mold preheated to 300-400℃, and the casting speed is controlled at 2-3kg / s to ensure complete molding and internal density. After demolding, the casting is air-cooled to 500℃, and then slowly cooled to room temperature in the furnace to reduce thermal stress. Thermal processing is also included: the billet is heated to 1050-1100℃, kept warm for 1-2 hours, and multi-pass hot rolling is adopted, with a single-pass reduction rate of 15-20%, a cumulative deformation of more than 60%, and grain refinement; after final rolling, it is immediately water quenched to room temperature for solid solution strengthening; and then tempered at 650-700℃ for 2-3 hours to eliminate residual stress and precipitate dispersion strengthening phase.

[0025] According to the lower limit of the above composition range, the ingredients are prepared: C is 0.12%, Si is 0.8%... Melting, casting, and hot processing are carried out in sequence to make tensile specimens. After testing, the yield strength at room temperature reaches 750MPa, the tensile strength is 900MPa, and the elongation is 18%; after immersion in 3.5% sodium chloride solution for 720 hours, the corrosion rate is only 0.08mm / year; after exposure to high temperature of 600℃ for 100 hours, the strength retention rate exceeds 80%.

[0026] Example 2, based on Example 1, the ingredients are prepared according to the upper limit of the above composition range: C is 0.18%, Si is 1.2%... Melting, casting, and hot processing are carried out in sequence to make a tensile test specimen. After testing, the room temperature yield of the obtained alloy exceeds 800MPa, the tensile strength exceeds 1000MPa, the elongation is 20%, and the corrosion resistance and high temperature performance are also excellent, which fully verifies the composition, process reliability and performance improvement effect.

[0027] Embodiment 3: A support plate 101 is fixedly connected to the top of the electric arc furnace 1, an upper support platform 2 is fixedly connected in the middle of the support plate 101, the upper support platform 2 is a hollow structure, a stirring drive member 3 is fixedly connected to the top of the upper support platform 2, a tubular stirring shaft 5 is fixedly connected to the rotating shaft of the stirring drive member 3, the tubular stirring shaft 5 is rotatably connected to the upper support platform 2 through a bearing and a sealing ring, a one-way air valve 6 is installed inside the tubular stirring shaft 5, the upper support platform 2 is a cavity structure, an argon gas input pipe 4 is installed on the upper support platform 2, a stirring disk 7 is fixedly connected to the lower end of the tubular stirring shaft 5, an access pipe 701 is distributed on the periphery of the stirring disk 7, a blade sheath 8 is sleeved on the access pipe 701, and a strip-shaped air-permeable brick 9 is installed on the blade sheath 8; an argon gas inlet hole 501 is opened on the upper end tube wall of the tubular stirring shaft 5, The argon gas inlet hole 501 is located inside the upper support 2, and the lower end of the tubular stirring shaft 5 is sleeved with an outer insulating sleeve 502 and an inner insulating sleeve 503; two insulating corrugated connecting plates 504 are fixedly connected to the inner wall of the inner insulating sleeve 503, and the insulating corrugated connecting plates 504 are of a corrugated structure. The one-way air valve 6 is located between the two insulating corrugated connecting plates 504, and the air inlet end of the one-way air valve 6 faces upward; the stirring plate 7 is a hollow structure, and the upper end of the stirring plate 7 is fixedly connected with an access pipe 701, and the access pipe 701 is fixedly connected to the lower ends of the outer insulating sleeve 502 and the inner insulating sleeve 503. Stirring blades 702 are distributed around the outer periphery of the stirring plate 7, and the stirring blades 702 are of a hollow structure. The interior of the stirring blades 702 is connected to the inner cavity of the stirring plate 7, and the stirring blades 70 2 is provided with an argon gas discharge hole 703; an assembly socket 801 is provided on the blade sheath 8, and an assembly slot 802 is provided on the inner wall of the assembly socket 801, and the assembly slot 802 is located outside the argon gas discharge hole 703; a strip-shaped air-permeable brick 9 is movably connected inside the assembly socket 801, and a guide insert 901 is processed on the edge of the strip-shaped air-permeable brick 9, and the guide insert 901 is inserted into the assembly slot 802; through the cooperation of the stirring drive 3 and the tubular stirring shaft 5, the stirring drive 3 drives the tubular stirring shaft 5 to drive the stirring plate 7 to rotate, so that the inside of the molten pool can be stirred to promote the mixing of the metal components inside the molten pool; at the same time, argon gas is input into the upper support 2 through the argon gas input pipe 4, and the argon gas passes through the argon gas inlet hole 501, the access pipe 701, The stirring disk 7 enters the stirring blade 702 and is discharged into the molten pool through the argon discharge hole 703, so that the stirring blade 702 rotates to stir the alloy melt while releasing argon, so that the argon can be more evenly distributed in the alloy melt and fully mixed with the alloy melt to improve the argon blowing effect. A blade sheath 8 is connected to the outer surface of the stirring blade 702, and a strip-shaped air-permeable brick 9 is arranged outside the blade sheath 8. The strip-shaped air-permeable brick 9 is fixed to the outside of the argon discharge hole 703 through the blade sheath 8 and fits tightly therewith. When the argon is discharged through the argon discharge hole 703, the gas passes through the strip-shaped air-permeable brick 9, so that the gas is further dispersed into tiny bubbles, and the alloy melt is prevented from entering the argon discharge hole 703 and clogging it under the action of the strip-shaped air-permeable brick 9;At the same time, a one-way air valve 6 is provided to maintain a certain air pressure inside the stirring disk 7, thereby reducing the penetration of the alloy melt into the argon gas discharge hole 703 under the action of hydraulic pressure. The provision of the outer heat-insulating sleeve 502, the inner heat-insulating sleeve 503 and the heat-insulating corrugated connecting plate 504 can reduce the probability of the one-way air valve 6 being damaged by heat. ;

[0028] Preparation steps: First, select high-purity raw materials and add them into the electric arc furnace 1 in sequence according to the proportion. First, pass a small current and melt at a low speed. After forming a molten pool, raise the temperature to 1550-1600℃ and refine for 30-40 minutes. During this period, argon is blown in to stir and remove impurities to make the composition uniform. At the end of refining, titanium and aluminum intermediate alloys are added to fine-tune the composition. After refining, the molten steel is cast into a sand mold preheated to 300-400℃, and the casting speed is controlled at 2-3kg / s to ensure The molding is complete and the internal is dense. After demolding, the casting is air-cooled to 500℃, and then slowly cooled to room temperature in the furnace to reduce thermal stress; the billet is heated to 1050-1100℃, kept warm for 1-2 hours, and multi-pass hot rolling is adopted, with a single-pass reduction rate of 15-20%, a cumulative deformation of more than 60%, and grain refinement; after final rolling, it is immediately water quenched to room temperature for solid solution strengthening; and then tempered at 650-700℃ for 2-3 hours to eliminate residual stress and precipitate dispersed strengthening phase.

[0029] In this article, there are a few points to note: 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0030] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0031] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A high performance alloy material, characterized in that: Based on the total weight of the high performance alloy material, the high performance alloy material comprises: 0.12-0.18% carbon; Silicon accounts for 0.8-1.2%; Manganese accounts for 0.5-0.8%; Nickel accounts for 3.5-4.5%; Molybdenum accounts for 0.4-0.6%; Chromium accounts for 9.0-10.5%; 0.05-0.15% titanium; Aluminum, which accounts for 0.03-0.08%; and the balance is iron.

2. The method for preparing a high performance alloy material according to claim 1, characterized in that: The process includes the following steps: selecting high-purity raw materials, adding them into an electric arc furnace in sequence according to the proportions, first passing a small current for low-speed melting, raising the temperature to 1550-1600°C and refining for 30-40 minutes after a molten pool is formed, during which argon is blown in for stirring and impurity removal to ensure uniform composition. At the end of refining, titanium and aluminum intermediate alloys are added to fine-tune the composition.

3. The method for preparing a high performance alloy material according to claim 2, characterized in that: It also includes a casting step: after refining, the molten steel is poured into a sand mold preheated to 300-400°C, and the casting speed is controlled at 2-3kg / s to ensure complete molding and internal density. After demolding, the casting is air-cooled to 500°C, and then put into the furnace to slowly cool to room temperature to reduce thermal stress.

4. The method for preparing a high performance alloy material according to claim 2, characterized in that: It also includes heat treatment: the billet is heated to 1050-1100℃, kept warm for 1-2 hours, and multi-pass hot rolling is adopted, with a single-pass reduction rate of 15-20%, a cumulative deformation of more than 60%, and grain refinement; after final rolling, it is immediately water quenched to room temperature for solid solution strengthening; then tempered at 650-700℃ for 2-3 hours to eliminate residual stress and precipitate dispersed strengthening phase.

5. A high performance alloy material preparation device, characterized in that: include: An electric arc furnace (1), wherein a support plate (101) is fixedly connected to the top of the electric arc furnace (1), an upper support platform (2) is fixedly connected to the middle of the support plate (101), the upper support platform (2) is a hollow structure, a stirring drive member (3) is fixedly connected to the top of the upper support platform (2), a rotating shaft of the stirring drive member (3) is fixedly connected to a tubular stirring shaft (5), the tubular stirring shaft (5) is rotatably connected to the upper support platform (2) via a bearing and a sealing ring, a one-way air valve (6) is installed inside the tubular stirring shaft (5), the upper support platform (2) is a cavity structure, an argon gas input pipe (4) is installed on the upper support platform (2), a stirring disk (7) is fixedly connected to the lower end of the tubular stirring shaft (5), an access pipe (701) is distributed on the periphery of the stirring disk (7), a blade sheath (8) is sleeved on the access pipe (701), and a strip-shaped air permeable brick (9) is installed on the blade sheath (8).

6. The high performance alloy material preparation equipment according to claim 5, characterized in that: An argon gas inlet hole (501) is provided on the upper end wall of the tubular stirring shaft (5), and the argon gas inlet hole (501) is located inside the upper support platform (2). An outer heat insulating sleeve (502) and an inner heat insulating sleeve (503) are sleeved on the lower end of the tubular stirring shaft (5).

7. The high performance alloy material preparation equipment according to claim 6, characterized in that: Two heat-insulating corrugated connecting plates (504) are fixedly connected to the inner wall of the inner heat-insulating sleeve (503), the heat-insulating corrugated connecting plates (504) being of a corrugated structure, the one-way air valve (6) being located between the two heat-insulating corrugated connecting plates (504), and the air inlet end of the one-way air valve (6) facing upwards.

8. The high performance alloy material preparation equipment according to claim 6, characterized in that: The stirring disk (7) is a hollow structure. The upper end of the stirring disk (7) is fixedly connected to an access pipe (701). The access pipe (701) is fixedly connected to the lower ends of the outer thermal insulation sleeve (502) and the inner thermal insulation sleeve (503). Stirring blades (702) are distributed around the outer periphery of the stirring disk (7). The stirring blades (702) are hollow structures. The interior of the stirring blades (702) is connected to the inner cavity of the stirring disk (7). Argon gas discharge holes (703) are provided on the stirring blades (702).

9. The high performance alloy material preparation equipment according to claim 8, characterized in that: The blade sheath (8) is provided with an assembly socket (801), and an assembly slot (802) is provided on the inner wall of the assembly socket (801), wherein the assembly slot (802) is located outside the argon gas discharge hole (703).

10. The high performance alloy material preparation equipment according to claim 9, characterized in that: The assembly socket (801) is movably connected with a strip-shaped air-permeable brick (9) inside, and the edge of the strip-shaped air-permeable brick (9) is processed with a guide insert (901), and the guide insert (901) is inserted into the assembly slot (802).

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