CN112795821A - Aluminum alloy for high-strength, corrosion-resistant and high-pressure pump body bolt and preparation method thereof - Google Patents
Aluminum alloy for high-strength, corrosion-resistant and high-pressure pump body bolt and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/05—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
Abstract
The invention relates to the technical field of aluminum alloy, in particular to an aluminum alloy for a high-strength, corrosion-resistant and high-pressure pump body bolt and a preparation method thereof. The aluminum alloy for the high-strength, corrosion-resistant and high-pressure pump body bolt comprises the following components in percentage by weight: si: 1.20-1.30%, Fe: less than or equal to 0.20 percent, Cu: 0.40-0.5%, Mn: 0.40-0.60%, Mg: 1.10-1.20%, Cr: 0.2-0.25%, Zn: 0.16-0.20%, Ti: less than or equal to 0.10 percent, and the balance of Al and inevitable impurities. The aluminum alloy for the pump body bolt with high strength, corrosion resistance and high pressure has strong corrosion resistance, tensile strength and good yield strength, and realizes that aluminum replaces steel; the invention also provides a preparation method of the composition.
Description
Technical Field
The invention relates to the technical field of aluminum alloy, in particular to an aluminum alloy for a high-strength, corrosion-resistant and high-pressure pump body bolt and a preparation method thereof.
Background
The aluminum alloy is an alloy with a certain amount of other alloying elements added on the basis of aluminum, and is one of light metal materials. The aluminium alloy has the general characteristics of aluminium, and also has the specific characteristics of some alloys due to the difference of the types and the amounts of the added alloying elements, so that the mechanical properties of the aluminium alloy exceed those of high-quality steel by improving the alloy proportion, and the aluminium alloy can replace the high-quality steel, has good casting performance and processing performance, and can be made into materials with different shapes. The high-pressure pump body bolt is mostly applied to the industries of chemical industry, ships, petroleum and the like, the requirements on the mechanical property and the physical property of the high-strength corrosion-resistant bolt are higher and higher, and the high-strength corrosion-resistant bolt serving as the high-pressure pump body has to meet the requirements on the high-strength corrosion-resistant property. The bolt aluminum alloy used as the connecting material can be applied to the whole device only when the high strength and the high yield strength are met.
The CN105112738 patent discloses a high-strength corrosion-resistant aluminum alloy material which is prepared from raw materials of Si, Fe, Cu, Mn, Mg, Cr and Zn, and mainly adopts an aluminum alloy material required by the preparation of adjusted Al-Mn-Cu, but the tensile strength is 163.3MPa, the yield strength is 78.6MPa, and the aluminum alloy material is relatively low and is difficult to meet the requirement of high-strength bolts.
The CN11534728 patent also discloses a high strength aluminum alloy for bolt and nut, which is composed of Si, Fe, Cu and other elements, and particularly, the elongation is improved by adding B, Mo and other elements, and the tensile strength is improved to 407MPa, but the yield strength is still relatively low, and the addition of rare metals increases the cost of raw materials.
The patent CN109338183 discloses a method for preparing a high strength aluminum alloy bolt, wherein conventional Mn and Cr elements are removed, and Zr is added to increase corrosion resistance, so that the tensile strength is greatly improved, but no related yield strength is mentioned, and the Zr is scarce in preparation and not beneficial to mass production.
Disclosure of Invention
The invention aims to provide the aluminum alloy for the high-strength, corrosion-resistant and high-pressure pump body bolt, which has stronger corrosion resistance, tensile strength and good yield strength, and realizes that aluminum replaces steel; the invention also provides a preparation method of the composition.
The aluminum alloy for the high-strength, corrosion-resistant and high-pressure pump body bolt comprises the following components in percentage by weight: si: 1.20-1.30%, Fe: less than or equal to 0.20 percent, Cu: 0.40-0.5%, Mn: 0.40-0.60%, Mg: 1.10-1.20%, Cr: 0.2-0.25%, Zn: 0.16-0.20%, Ti: less than or equal to 0.10 percent, and the balance of Al and inevitable impurities.
The preparation method of the aluminum alloy for the high-strength, corrosion-resistant and high-pressure pump body bolt comprises the following steps:
(1) smelting: smelting raw alloy components according to weight percentage, standing, degassing and filtering to obtain alloy aluminum liquid;
(2) casting: carrying out semi-continuous underwater oil-gas lubrication casting on the obtained molten aluminum to produce aluminum alloy ingots with different diameters;
(3) homogenizing: carrying out homogenization heat treatment on the aluminum alloy cast ingot, discharging and cooling the aluminum alloy cast ingot after heat treatment, and carrying out machining, head cutting, tail cutting, sizing and turning treatment to obtain a treated cast ingot;
(4) hot extrusion: carrying out hot extrusion, on-line quenching and water cooling on the treated cast ingot to obtain an aluminum alloy bar or section;
(5) pre-stretching: pre-stretching an aluminum alloy bar or section with the stretching rate of 0.5-1.5%;
(6) off-line quenching: off-line quenching is carried out on the pre-stretched aluminum alloy bar or section;
(7) stretching and straightening: stretching and straightening the aluminum alloy bar or section after the off-line quenching, wherein the stretching rate is 1-3%;
(8) and (3) heat treatment: and (4) carrying out artificial aging on the stretched aluminum alloy bar to obtain the high-strength, corrosion-resistant and high-pressure aluminum alloy for the pump body bolt.
In the step (1), the smelting temperature is 650-760 ℃, and the smelting time is 3-10 h;
standing at 680-760 ℃ for 20-80 min;
the filtration adopts a 30-mesh superimposed 50-mesh double-stage filter plate, and the hydrogen content measured by a launder is less than or equal to 0.12ml/100gAl when the filtered alloy liquid passes through the launder.
In the step (2), semi-continuous underwater oil-gas lubrication casting is carried out on the aluminum liquid at the temperature of 690-730 ℃, the casting speed is controlled to be 25-65mm/min, and aluminum alloy ingots with the diameter of 308-598mm and the length of more than 6000mm are cast.
In the step (3), the heat treatment condition is that heat preservation is carried out for 10-28 h at 400-600 ℃.
In the step (4), the hot extrusion temperature is 450-;
the online quenching temperature is 500-530 ℃;
the cooling method is water cooling, and aims to rapidly cool and control the generation of coarse crystal rings.
In the step (5), the pre-stretching is mainly straightening.
In the step (6), the offline quenching temperature is 545-560 ℃, the temperature is kept for 2.5-4h, the temperature is increased by 5-10 ℃ within 0.5h before the aluminum alloy bar or the aluminum alloy section is taken out of the furnace, the temperature loss after the aluminum alloy bar or the aluminum alloy section is ensured to be small, the aluminum alloy bar or the aluminum alloy section is completely quenched in water within 15s, the water temperature is controlled within 25 ℃, and the aim is to control the quenching temperature and ensure the quenching effect. .
In the step (7), the time for finishing all stretching and straightening is controlled within 4h after off-line quenching, and dimension measurement is carried out to ensure that the dimension of the product is qualified.
The labor efficiency temperature in the step (8) is 160-.
Specifically, the preparation method of the aluminum alloy for the high-strength, corrosion-resistant and high-pressure pump body bolt comprises the following steps:
(1) smelting: smelting raw material alloy components according to weight percentage for 3-10 hours at the temperature of 650-760 ℃, setting the temperature of a heat preservation furnace to 680-760 ℃, standing for 20-80 min, further refining and purifying, simultaneously degassing by adopting a furnace bottom blowing process, filtering by adopting a 30-mesh superimposed 50-mesh double-stage filter plate, and obtaining alloy aluminum liquid, wherein the hydrogen content measured by a launder when the filtered alloy liquid passes through the launder is less than or equal to 0.12ml/100 gAl;
(2) casting: carrying out semi-continuous underwater oil-gas lubrication casting on the obtained aluminum liquid at the temperature of 690-730 ℃, controlling the casting speed to be 25-65mm/min, and casting into an aluminum alloy ingot with the diameter of 308-598mm and the length of more than 6000 mm;
(3) homogenizing: carrying out homogenization heat treatment extrusion on the aluminum alloy cast ingot at 400-600 ℃ for 10-28 h, discharging and cooling after heat treatment, sequentially carrying out macroscopic and metallographic structure detection after the cooling temperature is not higher than 55 ℃, and carrying out machining, head cutting, tail cutting, sizing and skin turning on the qualified cast rod to obtain a treated cast ingot;
(4) hot extrusion: the processed cast ingot is processed by temperature of 350-;
(5) pre-stretching: stretching the cooled aluminum alloy bar or section with a stretching rate of 0.5-1.5%;
(6) off-line quenching: off-line quenching is carried out on the pre-stretched aluminum alloy bar or section, the quenching temperature is 545-560 ℃, the temperature is kept for 2.5-4h, the temperature is increased by 5-10 ℃ 0.5h before the aluminum alloy bar or section is taken out of the furnace, the aluminum alloy bar or section is required to be completely quenched in water within 15s, and the water temperature is controlled within 25 ℃;
(7) stretching and straightening: stretching and straightening the aluminum alloy bar or section after the off-line quenching, wherein the stretching rate is 1-3%, the time for finishing all stretching needs to be controlled within 4h after the quenching, and measuring the size to ensure that the product size is qualified;
(8) and (3) heat treatment: and (3) carrying out artificial aging on the stretched aluminum alloy bar at the temperature of 160-180 ℃, and carrying out heat preservation for 13-16h to obtain the high-strength, corrosion-resistant and high-pressure aluminum alloy for the pump body bolt.
The Al-Si-Mg-Cu alloy is adopted, wherein magnesium and silicon are added simultaneously to form a reinforcing phase of MgSi, so that the strength is improved, and the alloy has the advantages of small thermal expansion coefficient, good thermal conductivity, small hot cracking tendency and good fluidity; the copper element and the aluminum element have the same face-centered cubic structure, a ternary compound cannot be formed, the copper element can reduce the potential difference between a crystal boundary and an inner crystal, can change a precipitated phase structure and refine the crystal boundary precipitated phase, and can inhibit the tendency of crystal cracking, so that the stress corrosion resistance of the alloy is improved, the supersaturation degree of the alloy can be improved by the copper, and when the saturation degree of the alloy is 100-200%, the artificial aging process can be accelerated, the stable temperature range of an enrichment region (G.P region) is expanded, and the tensile strength is improved.
According to the invention, the formula of Al-Si-Mg-Cu is adopted, so that the high strength, the good corrosion resistance, the high hardness and the good conductivity are achieved, when the addition amount of silicon is lower than the formula amount of the alloy, the tensile strength and the hardness of the alloy are reduced, and when the addition amounts of silicon and magnesium are lower than the formula amount, the tensile strength, the hardness and the yield strength are reduced; when the amount of magnesium added is higher than the amount formulated in the present invention, both tensile strength and hardness are reduced, and when the amount of magnesium and silicon added is higher than the amount formulated in the present invention, although the strength is relatively high, elongation at break is significantly reduced and conductivity is also reduced.
Compared with the prior art, the invention has the following beneficial effects:
the invention determines an Al-Si-Mg-Cu alloy and a production process thereof, and different metal elements are mutually synergistic, so that the tensile strength, the yield strength and the corrosion resistance of the aluminum alloy are obviously improved, and the performance requirements of high-strength and corrosion-resistant high-pressure pump body bolts are completely met.
Detailed Description
The present invention will be further described with reference to the following examples.
The weight percentages of the starting materials used in examples 1-4 and comparative examples 1-4 are shown in Table 1.
TABLE 1 weight percentages of starting materials used in examples 1-4 and comparative examples 1-4
Example 1
The aluminum alloy for the high-pressure pump body bolt is prepared according to the formula amount in the table 1, and the method comprises the following specific steps:
(1) smelting: smelting raw material alloy components according to weight percentage for 7 hours at the temperature of 700 ℃, setting the temperature of a holding furnace to 700 ℃, standing for 60min, further refining and purifying, simultaneously degassing by adopting a furnace bottom blowing process, filtering by adopting a 30-mesh superposed 50-mesh double-stage filter plate, and obtaining alloy aluminum liquid, wherein the hydrogen content measured by a launder when the filtered alloy liquid passes through the launder is less than or equal to 0.12ml/100 gAl;
(2) casting: carrying out semi-continuous underwater oil-gas lubrication casting on the obtained aluminum liquid at 710 ℃, controlling the casting speed to be 30mm/min, and casting into an aluminum alloy ingot with the diameter of 500mm and the length of 6500 mm;
(3) homogenizing: carrying out homogenization heat treatment extrusion on the aluminum alloy cast ingot at 500 ℃ for 20h, discharging and cooling after heat treatment, sequentially carrying out macroscopic and metallographic structure detection after the cooling temperature is less than or equal to 55 ℃, and carrying out machining, head cutting, tail cutting, sizing and skin turning on the qualified cast rod to obtain a treated cast ingot;
(4) hot extrusion: the processed cast ingot is processed by the temperature of 400 ℃, the speed of an extruded product is 5.0m/min, the temperature of an online quenching outlet is set to 510 ℃, the temperature is kept for 6 hours, and water is cooled to obtain a finished aluminum alloy bar;
(5) pre-stretching: stretching the cooled aluminum alloy bar with the stretching rate of 1.2%;
(6) off-line quenching: off-line quenching is carried out on the pre-stretched aluminum alloy bar, the quenching temperature is 545 ℃, the temperature is kept for 3h, the temperature is increased by 5 ℃ within 0.5h before the bar is taken out of the furnace, the aluminum alloy bar is completely quenched in water within 15s, and the water temperature is controlled within 25 ℃;
(7) stretching and straightening: stretching and straightening the aluminum alloy bar stock subjected to the off-line quenching, wherein the stretching rate is 2.5%, the time for finishing all stretching needs to be controlled within 4h after quenching, and dimension measurement is carried out to ensure that the dimension of the product is qualified;
(8) and (3) heat treatment: and (3) carrying out artificial aging on the stretched aluminum alloy bar at 175 ℃, and keeping the temperature for 14h to obtain the high-strength, corrosion-resistant and high-pressure aluminum alloy for the pump body bolt.
Example 2
The aluminum alloy for the high-pressure pump body bolt is prepared according to the formula amount in the table 1, and the method comprises the following specific steps:
(1) smelting: smelting raw material alloy components according to weight percentage for 10 hours at the temperature of 650 ℃, setting the temperature of a holding furnace to 690 ℃, standing for 80min, further refining and purifying, simultaneously degassing by adopting a furnace bottom blowing process, filtering by adopting a 30-mesh superposed 50-mesh double-stage filter plate, and obtaining alloy aluminum liquid, wherein the hydrogen content measured by a launder when the filtered alloy liquid passes through the launder is less than or equal to 0.12ml/100 gAl;
(2) casting: carrying out semi-continuous underwater oil-gas lubrication casting on the obtained molten aluminum at 690 ℃, controlling the casting speed to be 55mm/min, and casting into an aluminum alloy ingot with the diameter of 400mm and the length of 7000 mm;
(3) homogenizing: carrying out homogenization heat treatment extrusion on the aluminum alloy cast ingot at 400 ℃ for 28h, discharging and cooling after heat treatment, sequentially carrying out macroscopic and metallographic structure detection after the cooling temperature is not higher than 55 ℃, and carrying out machining, head cutting, tail cutting, sizing and skin turning on the qualified cast rod to obtain a treated cast ingot;
(4) hot extrusion: the processed cast ingot is processed by 350 ℃, the speed of an extruded product is 5.0m/min, the temperature of an online quenching outlet is set to 530 ℃, the temperature is kept for 5 hours, and water is cooled to obtain an aluminum alloy bar;
(5) pre-stretching: stretching the cooled aluminum alloy bar with the stretching rate of 0.8%;
(6) off-line quenching: off-line quenching is carried out on the pre-stretched aluminum alloy bar, the quenching temperature is 550 ℃, the temperature is kept for 2.5h, the temperature is increased by 5 ℃ within 0.5h before the aluminum alloy bar is taken out of the furnace, the aluminum alloy bar is completely quenched in water within 15s, and the water temperature is controlled within 25 ℃;
(7) stretching and straightening: stretching and straightening the aluminum alloy bar stock subjected to the off-line quenching, wherein the stretching rate is 1.8%, the time for finishing all stretching needs to be controlled within 4h after quenching, and dimension measurement is carried out to ensure that the dimension of the product is qualified;
(8) and (3) heat treatment: and (3) carrying out artificial aging on the stretched aluminum alloy bar at the temperature of 180 ℃ for 13h, and obtaining the high-strength, corrosion-resistant and high-pressure aluminum alloy for the pump body bolt.
Example 3
The aluminum alloy for the high-pressure pump body bolt is prepared according to the formula amount in the table 1, and the method comprises the following specific steps:
(1) smelting: smelting raw material alloy components according to weight percentage for 5 hours at the temperature of 750 ℃, setting the temperature of a holding furnace to 690 ℃, standing for 40min, carrying out further refining and purification, simultaneously degassing by adopting a furnace bottom blowing process, then filtering by adopting a 30-mesh superposed 50-mesh double-stage filter plate, and obtaining alloy aluminum liquid, wherein the hydrogen content measured by a launder when the filtered alloy liquid passes through the launder is less than or equal to 0.12ml/100 gAl;
(2) casting: carrying out semi-continuous underwater oil-gas lubrication casting on the obtained molten aluminum at 690 ℃, controlling the casting speed to be 60mm/min, and casting into an aluminum alloy ingot with the diameter of 500mm and the length of 7000 mm;
(3) homogenizing: carrying out homogenization heat treatment extrusion on the aluminum alloy cast ingot at 600 ℃ for 12h, discharging and cooling after heat treatment, sequentially carrying out macroscopic and metallographic structure detection after the cooling temperature is less than or equal to 55 ℃, and carrying out machining, head cutting, tail cutting, sizing and skin turning on the qualified cast rod to obtain a treated cast ingot;
(4) hot extrusion: the processed cast ingot is processed by the temperature of 450 ℃, the speed of an extruded product is 5.0m/min, the temperature of an online quenching outlet is set to be 500 ℃, the temperature is kept for 7 hours, and water is cooled to obtain a finished aluminum alloy bar;
(5) pre-stretching: stretching the cooled aluminum alloy bar with the stretching rate of 1.1%;
(6) off-line quenching: off-line quenching is carried out on the pre-stretched aluminum alloy bar, the quenching temperature is 553 ℃, the temperature is kept for 2.2h, the temperature is raised by 5 ℃ 0.5h before the aluminum alloy bar is taken out of the furnace, the aluminum alloy bar is completely quenched in water within 15s, and the water temperature is controlled within 25 ℃;
(7) stretching and straightening: stretching and straightening the aluminum alloy bar stock subjected to the off-line quenching, wherein the stretching rate is 2.0%, the time for finishing all stretching needs to be controlled within 4h after quenching, and dimension measurement is carried out to ensure that the dimension of the product is qualified;
(8) and (3) heat treatment: and (3) carrying out artificial aging on the stretched aluminum alloy bar at the temperature of 170 ℃ for 15h, and obtaining the high-strength, corrosion-resistant and high-pressure aluminum alloy for the pump body bolt.
Example 4
The aluminum alloy for the high-pressure pump body bolt is prepared according to the formula amount in the table 1, and the method comprises the following specific steps:
(1) smelting: smelting raw material alloy components according to weight percentage for 8 hours at the temperature of 710 ℃, setting the temperature of a holding furnace to be 720 ℃, standing for 50min, further refining and purifying, simultaneously degassing by adopting a furnace bottom blowing process, then filtering by adopting a 30-mesh superposed 50-mesh double-stage filter plate, and obtaining alloy aluminum liquid, wherein the hydrogen content measured by a launder when the filtered alloy liquid passes through the launder is less than or equal to 0.12ml/100 gAl;
(2) casting: carrying out semi-continuous underwater oil-gas lubrication casting on the obtained molten aluminum at 710 ℃, controlling the casting speed to be 60mm/min, and casting into an aluminum alloy ingot with the diameter of 450mm and the length of 9000 mm;
(3) homogenizing: carrying out homogenization heat treatment extrusion on the aluminum alloy cast ingot at 550 ℃ for 13h, discharging and cooling after heat treatment, sequentially carrying out macroscopic and metallographic structure detection after the cooling temperature is less than or equal to 55 ℃, and carrying out machining, head cutting, tail cutting, sizing and skin turning on the qualified cast rod to obtain a treated cast ingot;
(4) hot extrusion: the processed cast ingot is processed by 390 ℃, the speed of an extruded product is 5.0m/min, the temperature of an online quenching outlet is set to 510 ℃, the temperature is kept for 6 hours, and water is cooled to obtain a finished aluminum alloy bar;
(5) pre-stretching: stretching the cooled aluminum alloy bar with the stretching rate of 1.1%;
(6) off-line quenching: off-line quenching is carried out on the pre-stretched aluminum alloy bar, the quenching temperature is 553 ℃, the temperature is kept for 2.2h, the temperature is raised by 5 ℃ 0.5h before the aluminum alloy bar is taken out of the furnace, the aluminum alloy bar is completely quenched in water within 15s, and the water temperature is controlled within 25 ℃;
(7) stretching and straightening: stretching and straightening the aluminum alloy bar stock subjected to the off-line quenching, wherein the stretching rate is 2.0%, the time for finishing all stretching needs to be controlled within 4h after quenching, and dimension measurement is carried out to ensure that the dimension of the product is qualified;
(8) and (3) heat treatment: and (3) carrying out artificial aging on the stretched aluminum alloy bar at the temperature of 160 ℃, and preserving heat for 16h to obtain the high-strength, corrosion-resistant and high-pressure aluminum alloy for the pump body bolt.
Comparative examples 1 to 4
According to the formulation amounts in table 1, the specific steps are the same as those in example 1, and the aluminum alloy for high-pressure pump body bolts is prepared.
The aluminum alloys for high-pressure pump body bolts obtained in examples 1 to 4 and comparative examples 1 to 4 were tested for their properties in accordance with GB5237.1-2004, and the results are shown in table 2:
TABLE 2 results of Performance test of examples 1 to 4 and comparative examples 1 to 4
Claims (10)
1. The utility model provides a high strength, corrosion-resistant high pressure pump body aluminum alloy for bolt which characterized in that: the paint consists of the following components in percentage by weight: si: 1.20-1.30%, Fe: less than or equal to 0.20 percent, Cu: 0.40-0.5%, Mn: 0.40-0.60%, Mg: 1.10-1.20%, Cr: 0.2-0.25%, Zn: 0.16-0.20%, Ti: less than or equal to 0.10 percent, and the balance of Al and inevitable impurities.
2. The method for preparing the aluminum alloy for the high-strength, corrosion-resistant and high-pressure pump body bolt according to claim 1, which is characterized by comprising the following steps: the method comprises the following steps:
(1) smelting: smelting raw alloy components according to weight percentage, standing, degassing and filtering to obtain alloy aluminum liquid;
(2) casting: carrying out semi-continuous underwater oil-gas lubrication casting on the obtained molten aluminum to produce aluminum alloy ingots with different diameters;
(3) homogenizing: carrying out homogenization heat treatment on the aluminum alloy cast ingot, discharging and cooling the aluminum alloy cast ingot after heat treatment, and carrying out machining, head cutting, tail cutting, sizing and turning treatment to obtain a treated cast ingot;
(4) hot extrusion: carrying out hot extrusion, on-line quenching and water cooling on the treated cast ingot to obtain an aluminum alloy bar or section;
(5) pre-stretching: pre-stretching an aluminum alloy bar or section with the stretching rate of 0.5-1.5%;
(6) off-line quenching: off-line quenching is carried out on the pre-stretched aluminum alloy bar or section;
(7) stretching and straightening: stretching and straightening the aluminum alloy bar or section after the off-line quenching, wherein the stretching rate is 1-3%;
(8) and (3) heat treatment: and (4) carrying out artificial aging on the stretched aluminum alloy bar to obtain the high-strength, corrosion-resistant and high-pressure aluminum alloy for the pump body bolt.
3. The method for preparing the aluminum alloy for the high-strength, corrosion-resistant and high-pressure pump body bolt according to claim 2, wherein the method comprises the following steps: in the step (1), the smelting temperature is 650-760 ℃, and the smelting time is 3-10 h; the standing temperature is 680-760 ℃, and the standing time is 20-80 min.
4. The method for preparing the aluminum alloy for the high-strength, corrosion-resistant and high-pressure pump body bolt according to claim 2, wherein the method comprises the following steps: in the step (1), a 30-mesh superposed 50-mesh double-stage filter plate is adopted for filtering, and the hydrogen content measured by a launder is less than or equal to 0.12ml/100gAl when the filtered alloy liquid passes through the launder.
5. The method for preparing the aluminum alloy for the high-strength, corrosion-resistant and high-pressure pump body bolt according to claim 2, wherein the method comprises the following steps: in the step (2), semi-continuous underwater oil-gas lubrication casting is carried out on the aluminum liquid at the temperature of 690-730 ℃, the casting speed is controlled to be 25-65mm/min, and aluminum alloy ingots with the diameter of 308-598mm and the length of more than 6000mm are cast.
6. The method for preparing the aluminum alloy for the high-strength, corrosion-resistant and high-pressure pump body bolt according to claim 2, wherein the method comprises the following steps: in the step (3), the heat treatment condition is that heat preservation is carried out for 10-28 h at 400-600 ℃.
7. The method for preparing the aluminum alloy for the high-strength, corrosion-resistant and high-pressure pump body bolt according to claim 2, wherein the method comprises the following steps: in the step (4), the hot extrusion temperature is 450-; the online quenching temperature is 500-530 ℃.
8. The method for preparing the aluminum alloy for the high-strength, corrosion-resistant and high-pressure pump body bolt according to claim 2, wherein the method comprises the following steps: in the step (6), the offline quenching temperature is 545-560 ℃, the temperature is kept for 2.5-4h, the temperature is increased by 5-10 ℃ 0.5h before the aluminum alloy bar or section is taken out of the furnace, the aluminum alloy bar or section is completely quenched in water within 15s, and the water temperature is controlled within 25 ℃.
9. The method for preparing the aluminum alloy for the high-strength, corrosion-resistant and high-pressure pump body bolt according to claim 2, wherein the method comprises the following steps: in the step (7), the time for finishing all stretching and straightening is controlled within 4 hours after off-line quenching.
10. The method for preparing the aluminum alloy for the high-strength, corrosion-resistant and high-pressure pump body bolt according to claim 2, wherein the method comprises the following steps: the labor efficiency temperature in the step (8) is 160-.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113403509A (en) * | 2021-06-23 | 2021-09-17 | 上海嘉朗实业南通智能科技有限公司 | High-strength aluminum alloy bolt material and preparation method thereof |
| CN115323226A (en) * | 2022-10-14 | 2022-11-11 | 山东裕航特种合金装备有限公司 | Fastener for ship and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015124409A (en) * | 2013-12-26 | 2015-07-06 | 住友電気工業株式会社 | Aluminum alloy wire material, production method of it, and aluminum alloy member |
| CN108118210A (en) * | 2017-11-28 | 2018-06-05 | 中铝材料应用研究院有限公司 | A kind of processing method of aluminium alloy and its extrudate |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015124409A (en) * | 2013-12-26 | 2015-07-06 | 住友電気工業株式会社 | Aluminum alloy wire material, production method of it, and aluminum alloy member |
| CN108118210A (en) * | 2017-11-28 | 2018-06-05 | 中铝材料应用研究院有限公司 | A kind of processing method of aluminium alloy and its extrudate |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113403509A (en) * | 2021-06-23 | 2021-09-17 | 上海嘉朗实业南通智能科技有限公司 | High-strength aluminum alloy bolt material and preparation method thereof |
| CN115323226A (en) * | 2022-10-14 | 2022-11-11 | 山东裕航特种合金装备有限公司 | Fastener for ship and preparation method thereof |
| CN115323226B (en) * | 2022-10-14 | 2023-01-24 | 山东裕航特种合金装备有限公司 | Fastener for ship and preparation method thereof |
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