CN106521255A - 6A02 alloy rod, and production method thereof - Google Patents

Abstract

The invention provides a 6A02 alloy rod and a production process thereof, and relates to the technical field of aluminum alloy processing. The production process of the 6A02 alloy rod comprises a feeding melting step, a refining step, an optimization step, a casting step and a post-processing step. The production process of the 6A02 alloy rod provided by the present invention can produce a 6A02 alloy rod with strong tensile strength and high Brinell hardness. 6A02 alloy bar.

Description

A kind of 6A02 alloy bar and its production process

technical field

The invention relates to the technical field of aluminum alloy processing, in particular to a 6A02 alloy rod and a production process thereof.

Background technique

6A02 alloy belongs to the Al-Mg-Si series aluminum alloy, which can be strengthened by heat treatment. It has medium strength, good welding performance and corrosion resistance. After quenching and aging, it has good plasticity and machinability. It is mainly used in electric power and structure. engineering industry. For 6A02 alloy rods with a diameter of less than 150mm (if it is not a round rod, it refers to the diameter of the inscribed circle), according to the existing 6A02-T6 rod production technology in the industry, the tensile strength of the obtained rod is generally 295MPa~ 340MPa, Brinell hardness is also below 95HB. These bars with low tensile strength and low hardness cannot meet the more stringent requirements of use due to problems such as machine sticking and insufficient strength, and this directly restricts the scope of use of 6A02 alloy bars. Based on this, Li Niankui and others proposed a solution quenching process and aging heat treatment process for 6A02 aluminum alloy in the invention patent "A Heat Treatment Method for 6A02 Aluminum Alloy", which can make the Brinell hardness of 6A02 alloy reach more than 120HB. But even if the Brinell hardness is increased, there may still be situations such as low tensile strength and easy fracture. In summary, how to improve the comprehensive performance of 6A02 alloy is the key.

Contents of the invention

The object of the present invention is to provide a production process for 6A02 alloy rods, which can produce 6A02 alloy rods with high tensile strength and high Brinell hardness.

Another object of the present invention is to provide a 6A02 alloy rod, which has good comprehensive performance and wide application range.

The present invention solves its technical problem and adopts the following technical solutions to realize:

A production process of 6A02 alloy bar, comprising:

Feeding and smelting step: mix the molten aluminum at 800-820°C with the solid material, add the ingredients when the temperature drops to 750-770°C, stir and smelt for 10-20 minutes, then remove the slag to obtain the smelted product; among them, the solid material is mixed with the molten aluminum For aluminum scraps with the same alloy grade as raw materials, the mass ratio of aluminum liquid to solid material is 100:15-20, and the ingredients are other alloy element raw materials necessary for the production of 6A02 alloy bars;

Refining step: mix the smelt and refining agent, refine at 730-750°C for 15-20 minutes, the mass ratio of refining agent to smelting product is 0.1-0.3:100;

Optimization steps: keep the temperature of the refined melt at 715-725°C, use a protective gas with a purity of more than 99.9% to remove hydrogen from the bottom of the melt from bottom to top, and then filter the melt; among them, the protective gas One or more selected from nitrogen and inert gases, the pressure of the protective gas is 0.2-0.6MPa, and the flow rate is 5-6m ³ /h;

Casting step: casting the melt, the casting temperature is 710-720°C, and the external water cooling of the casting mold used during casting;

Post-processing steps: removing the surface segregation layer of the cast ingot, and then performing heat extrusion, quenching, and artificial aging treatment.

In addition, a 6A02 alloy rod is produced through the above-mentioned production process of the 6A02 alloy rod.

Compared with the prior art, the present invention includes the following beneficial effects: the present invention first uses the heat of the high-temperature aluminum liquid to melt the solid material, and in the process, on the one hand, it can achieve the purpose of reducing the temperature of the aluminum liquid and initially removing the gas in the aluminum liquid On the other hand, it can also provide crystal nuclei for the crystallization process of ingots in the later stage, increase the nucleation ability, and increase the grain size. Then, according to the required alloy rods, add the ingredients according to the amount, and then refine and optimize. During the optimization process, because the protective gas is blown from bottom to top, a large number of dispersed fine bubbles will be generated in the melt, and These fine bubbles can be carried out to remove the hydrogen-containing gas and oxidized inclusions contained in the melt. The continuous casting operation adopts external water-cooled condensation casting technology, so the casting effect is good, and the quality of the obtained ingot is high. In order to eliminate the structural defects, the surface segregation layer of the ingot is removed. Through subsequent operations, the obtained 6A02 alloy bar with good overall performance and high quality.

The 6A02 alloy bar produced by the production process provided by the invention can reach the following indicators: tensile strength ≥ 340MPa, elongation after fracture ≥ 8%, and Brinell hardness ≥ 95HB. The strength of the alloy bar is significantly improved, which is far higher than the requirements of the national standard. Through the process provided by the invention, the high-strength 6A02 alloy bar can be stably produced in batches, has high practicability, and is suitable for wide-scale promotion.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Those who do not indicate the specific conditions in the examples are carried out according to the conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments used were not indicated by the manufacturer, and they were all conventional products that could be purchased from the market.

The 6A02 alloy rod and its production process of the embodiment of the present invention will be described in detail below.

The production process of 6A02 alloy rods includes step S1, feeding and smelting: mixing aluminum liquid at 800-820°C with solid material, adding ingredients when the temperature drops to 750-770°C, stirring and melting for 10-20 minutes, then removing slag to obtain smelted Among them, the solid material is aluminum scrap with the same alloy grade as the aluminum liquid raw material, the mass ratio of the aluminum liquid to the solid material is 100:15-20, and the ingredients are other alloy element raw materials necessary for the production of 6A02 alloy rods.

In actual operation, the aluminum liquid can be the aluminum liquid obtained by electrolysis. According to the pre-analysis results of the electrolytic aluminum liquid, select a suitable aluminum electrolytic cell for aluminum extraction, and then pump the electrolytic aluminum liquid from the electrolytic cell to a vacuum ladle and transport it to casting The workshop is poured into the melting furnace, and then the solid material is added. In this way, the production process is one line. Because of the electrolysis, the obtained aluminum liquid can be transferred and put into production application, and mixed with solid materials, without the need to solidify, transfer, and remelt the aluminum liquid, which simplifies the production process and reduces production energy consumption. . As long as the solid material is aluminum scrap with the same alloy grade as the raw material of molten aluminum, the aluminum scrap can be selected from one of aluminum ingots for remelting, ingot sawing tails, hot-rolled thick plate trimmings, or Various. When the temperature of the mixture of aluminum liquid and solid material is lowered to 750-770°C (preferably 767-770°C), the ingredients are prepared according to the alloy bar to be produced and added to the melting furnace. The ingredients are selected from one or more of aluminum alloy element additives (such as Cu element additives, Mn element additives, etc.), Al-Fe master alloys, Al-Cu master alloys, Al-Si master alloys, and Mg ingots. After adding the ingredients, fully stir and smelt, then remove the slag, take a sample for quick analysis, if the composition meets the composition requirements of the prepared aluminum alloy, transfer the smelted product obtained after the slag removal to a static furnace for subsequent refining treatment. In step S1, the hydrogen content in the smelt can be reduced by lowering the temperature, stirring and removing slag, and other treatments.

It should be noted here that those skilled in the art know that due to different alloy rods produced, the specific components and amounts of the ingredients will vary, so there is no limitation here. In addition, slag removal is a common operation in this field, that is, to remove scum on the liquid surface, so details will not be repeated here.

The production process of the 6A02 alloy bar also includes step S2, refining: mixing the smelt with a refining agent, refining at 730-750° C. for 15-20 minutes, and the mass ratio of the refining agent to the smelt is 0.1-0.3:100.

In the refining step, the method of mixing and refining the smelt and refining agent is the powder spraying refining method. The specific operation is: pour the smelt to be refined into the static furnace, and then put the powdered refining agent into the powder spraying tank , Connect the "T" type refiner and the powder spray tank firmly, insert it into the smelt of the static furnace, open the gas valve of the gas bottle, and operate the "T" type refiner to move back and forth in the static furnace. Wherein, what is installed in the gas bottle is a protective gas with a purity of more than 99.9% (preferably more than 99.99%), selected from one or more of nitrogen and inert gases, and the pressure in the gas bottle is 0.2-0.6MPa. The flow rate of the outgoing gas is 5-6m ³ /h. Refining by powder spraying method is very effective. This is because after the bubbles mixed with powdered refining agent enter the smelt, the powdered refining agent melts and wraps on the surface of the bubbles in the form of a liquid flux film, which dissolves and adsorbs the oxide film on the surface of the bubbles, causing them to disintegrate. At this time, the speed of hydrogen entering the bubbles through the flux film from the smelt is much faster than that through the oxide film, and it also prevents the direct contact between the smelt and the moisture in the protective gas. On the other hand, since the flux film improves the activity of the bubble surface and strengthens the ability of adsorption and removal of slag, the effect of slag removal is also significantly improved, and the amount of oxidized inclusions is significantly reduced. The measurement data show that the hydrogen content in the smelt can be reduced to 0.3mL/100gAl to 0.4mL/100gAl through the refining treatment in the furnace of the present invention.

Since the protective gas is introduced in the above refining process, after the above treatment, to meet the requirements of casting, it can also be improved, that is, after using the powder spraying refining method to mix and refine the smelt and refining agent, the refining step also includes: Sprinkle the covering agent on the surface of the melt after mixing and refining, and let it stand for 10-15 minutes. The mass ratio of the covering agent to the melt is 0.2-0.4:100. In the present invention, the covering agent is preferably a covering agent whose main components are KCl, MgCl ₂ and CaF ₂ . In the previous operation, the gas was introduced into the smelt, and the gas brought out the waste slag. After refining, the waste slag floated on the surface of the obtained melt, and the surface of the melt was sprinkled with a covering agent to make the surface float. The waste slag settles to the bottom of the static furnace, and when the melt needs to be poured out for processing or casting later, the waste slag is left at the bottom of the static furnace, so that the waste slag is removed.

Since the refining agent is a well-known and commonly used product by those skilled in the art, and its selection is not limited, it is not given here to give examples one by one. In the present invention, the refining agent produced by Yantai Xing Aluminum Metal Material Co., Ltd. is preferred.

The production process of the 6A02 alloy bar also includes step S3, optimization: keep the temperature of the refined melt at 715-725° C., use a protective gas with a purity of more than 99.9% (preferably more than 99.99%) from the bottom of the melt Blow upwards to remove hydrogen, and then filter the melt; wherein, the protective gas is selected from one or more of nitrogen and inert gases, the pressure of the protective gas is 0.2-0.6MPa, and the flow rate is 5-6m ³ / h.

When using protective gas to blow from bottom to top, the high-speed rotating graphite rotor nozzle can be used to blow protective gas from the bottom of the melt, so that a large number of dispersed, high-speed fine bubbles can be generated without tumbling on the surface of the melt . Due to the strong stirring effect of the rotating nozzle, the diffusion of bubbles in the entire molten pool is strengthened, thereby effectively increasing the contact interface between gas and liquid, promoting the renewal of the contact interface between gas and liquid, and significantly improving the kinetics of purifying the melt by floating method condition. At the same time, due to the slow rising speed of the fine bubbles in the melt, under the combined action of centrifugal force and buoyancy, the bubbles rise along a spiral path in the molten pool, prolonging the time of gas-liquid contact, thereby more effectively removing the melt. Hydrogen in the body, while degassing, under the action of the flotation principle, the oxidized inclusions are also removed to a certain extent. The measurement data show that after the method provided by the invention is used to optimize the hydrogen removal, the hydrogen content in the melt is reduced to 0.17mL/100gAl-0.21mL/100gAl, and the purification efficiency is 46-51%.

In the optimization step, the melt filtration is specifically performed as follows: heating the ceramic foam plate of 35-45 ppi to 600-750° C., and then filtering the melt. There are many ways to filter the melt. It is preferred to use a foam ceramic plate (foam ceramic filter plate) to filter the melt. The heated foam ceramic plate is used to filter the melt, which can not only avoid the blockage of the foam ceramic plate, but also achieve effective removal of melt. purpose of body inclusions. In addition, according to the principle of slag gas accompanying, while removing inclusions, the hydrogen in the melt will be further reduced. In the present invention, after filtering with a ceramic foam filter plate, the hydrogen content in the melt can be reduced to 0.12mL/ 100gAl～0.14mL/100gAl. Among them, ppi refers to the number of meshes per inch of porous ceramic foam board.

If the alloy composition permits, in the optimization step, after the melt is filtered, it may further include: adding a modifier to the melt, and the mass ratio of the melt to the modifier is 100:0.01-0.03. The crystallization process can be improved by adding a modifier, preferably using Al-Ti-B as a modifier.

The production process of the 6A02 alloy bar also includes step S4, casting: casting the melt, the casting temperature is 710-720° C., and the external water cooling of the casting mold used during casting.

Wagstaff casting techniques are preferred for casting, condensate casting ingots. Without affecting the surface quality, the entire casting process should be kept as low temperature, low liquid level and low speed as possible. During the casting process, timely and appropriate adjustments should be made to the casting speed and cooling intensity (water volume, water pressure) according to the surface quality of the ingot and different casting stages.

The production process of the 6A02 alloy bar also includes step S5, post-processing: removing the surface segregation layer of the cast ingot obtained by casting, and then performing heat extrusion, quenching, and artificial aging treatment.

The post-processing steps specifically include: removing the surface segregation layer of the ingot obtained by casting (the removal amount of the segregation layer on the surface of the ingot should be kept below 3mm), and then cutting the ingot into short rods, heating to 450-470°C Carry out forward extrusion, the speed of forward extrusion is 1-3m/min, then quench and stretch the short rod, keep it warm at 150-160°C for 7-9h, and test it after air cooling.

The surface quality of the ingot is required to be high, and removing the surface segregation layer of the ingot obtained by casting can eliminate structural defects. The surface roughness of the ingot is preferably below Ra12.5, and the outer surface of the ingot must be kept clean. After passing the low-magnification inspection, the ingot can be cut into short rods of Φ410×700mm-1500mm. Then use a power frequency induction furnace to heat the short rod, and control the temperature gradient to be 5-10°C/100mm. Extrusion can be carried out on a 55MN extruder. The extrusion process parameters are shown in Table 1. The working belt width of the extrusion die is controlled at 5mm-10mm to produce finished products. After the product flows out of the die hole, when the temperature of the metal at the outlet of the product is controlled to not be lower than 460°C, it is pulled and stretched, and the pulling speed is synchronized with the extrusion speed of the product, and it is cooled by weak air.

Table 1 Extrusion process parameters

After the extrusion is completed, the bar blank can be placed in an air furnace for quenching, the quenching temperature is 510-530°C, and the holding time is 180-220min. The post-treatment step also includes stretching after quenching and before artificial aging. Stretching straightens the product and eliminates residual stresses generated during extrusion and quenching. Dimensional measurements should be made before and after stretch straightening to meet the dimensional tolerance requirements of the material. In order to improve the mechanical properties of the material, the material must be artificially aged in an artificial aging furnace at a temperature of 150-160°C, held for 7.5-8.5 hours, and air-cooled after being released from the furnace.

After the material is processed by the above method, samples are taken for microstructure, hardness and performance testing to obtain 6A02 alloy rods.

The present invention also provides a 6A02 alloy rod, which is produced through the above-mentioned production process of the 6A02 alloy rod.

In terms of weight percentage, the composition includes: Si 0.9~1.10%, Fe 0.20~0.40%, Cu 0.40~0.55%, Mn 0.20~0.30%, Mg 0.60~0.80%, Zn≤0.20%, Ti≤0.15%, and other impurities ≤0.15% (among them, a single impurity ≤0.05%) and Al balance.

Below in conjunction with embodiment, feature and performance of the present invention are described in further detail:

Embodiment one

The 6A02 alloy bar to be prepared in this example includes, by weight percentage, 1.0% Si, 0.4% Fe, 0.5% Cu, 0.3% Mn, 0.75% Mg, 0.2% Zn, 0.15% Ti, and other impurities 0.15% and Al balance.

Its production process includes the following steps:

Step S1: Calculate the ratio according to the 6A02 alloy rod to be prepared, mix the aluminum liquid at 820°C with the aluminum ingot for remelting, and add the calculated Cu element additive when the temperature of the mixture drops to 770°C, Mn element additives, Si element additives, and Mg element additives were stirred and smelted for 20 minutes, and then the slag was removed to obtain the smelt; wherein, the mass ratio of the aluminum liquid to the aluminum ingot for remelting was 100:20;

Step S2: Mix the smelt with a refining agent (manufactured by Yantai Xing Aluminum Metal Materials Co., Ltd.), and refine at 750°C for 20 minutes. The mass ratio of the refining agent to the smelt is 0.3:100;

Step S3: keeping the temperature of the refined melt at 725°C, blowing nitrogen with a purity of 99.9% from the bottom of the melt from bottom to top, and then heating a 45ppi foam ceramic plate to 750°C, and filtering the melt; Among them, the pressure of nitrogen is 0.6MPa, and the flow rate is 6m ³ /h;

Step S4: using the wagstaff casting technology to cast the melt, the casting temperature is 720°C, and the external water cooling of the casting mold used during casting;

Step S5: remove the surface segregation layer of the cast ingot and keep the removal amount of the surface segregation layer at 3mm on one side, then cut the ingot into a short rod of Φ410×1500mm, heat it to 470°C and carry out forward extrusion, The speed of forward extrusion is 3m/min, then put the short rod at 530°C for quenching, keep it warm for 220min, and then stretch it, keep it at 160°C for 9h to achieve artificial aging, and test it after air cooling.

The 6A02 alloy bar prepared in this example meets the composition and performance requirements, its tensile strength is 340MPa, its elongation after fracture is 9%, and its Brinell hardness is 95HB.

Embodiment two

The 6A02 alloy bar to be prepared in this example includes, by weight percentage, 0.9% Si, 0.20% Fe, 0.40% Cu, 0.20% Mn, 0.60% Mg, 0.05% Zn, 0.1% Ti, and other impurities 0.05% and Al balance.

Its production process includes the following steps:

Step S1: Calculate the proportion according to the 6A02 alloy bar to be prepared, mix the aluminum liquid at 800°C with the sawing head and tail of the ingot, and add the calculated Cu element when the temperature of the mixture drops to 750°C Additives, Mn element additives, Al-Fe master alloys, Mg ingots, stirring and smelting for 10 minutes and then removing slag to obtain smelted products; wherein, the mass ratio of aluminum liquid to solid material is 100:15;

Step S2: Pour the smelt to be refined into the static furnace, then put the powdered refining agent (produced by Yantai Xing Aluminum Metal Material Co., Ltd.) into the powder spray tank, and connect the "T" type refiner to the powder spray tank Firmly, insert it into the smelt of the static furnace, open the gas cylinder valve, operate the "T" type refiner to move back and forth in the static furnace, and ensure that it is refined at 730 ° C for 15 minutes; among them, the mass ratio of refining agent to smelt is 0.1 : 100, the gas bottle is filled with argon gas with a purity of 99.99%, the pressure in the gas bottle is 0.2MPa, and the flow rate of the ejected gas is 5m ³ /h;

After the above operations, sprinkle the covering agent on the surface of the melt and let it stand for 10 minutes. The mass ratio of the covering agent (main components include KCl, MgCl ₂ and CaF ₂ ) to the melt is 0.4:100;

Step S3: Keep the temperature of the refined melt at 715°C, use helium with a purity of 99.99% to blow from the bottom of the melt from bottom to top, then heat a 35ppi foam ceramic plate to 600°C, and filter the melt , and then add Al-Ti-B wire into the melt; wherein, the pressure of helium is 0.2MPa, the flow rate is 5m ³ /h, and the mass ratio of the melt to the Al-Ti-B wire is 100:0.01;

Step S4: using the wagstaff casting technology to cast the melt, the casting temperature is 710°C, and the external water cooling of the casting mold used during casting;

Step S5: Remove the surface segregation layer of the cast ingot and the removal amount of the segregation layer on the surface of the ingot is 0.5 mm, and then cut the ingot into a short rod of Φ410×700 mm, heat it to 450 ° C and carry out forward extrusion The speed of forward extrusion is 1m/min, and then the short rod is quenched at 510°C for 180min, then stretched, and held at 160°C for 7.5h to complete artificial aging, and then tested after air cooling.

The 6A02 alloy bar prepared in this example meets the composition and performance requirements, its tensile strength is 365MPa, its elongation after fracture is 11%, and its Brinell hardness is 99HB.

Embodiment Three

In this example, the 6A02-T6 alloy bar is to be prepared, and the composition includes: Si 1.0%, Fe0.3%, Cu 0.45%, Mn 0.25%, Mg 0.7%, Zn 0.1%, Ti 0.05%, and the rest 0.05% impurity and Al balance.

Its production process includes the following steps:

Step S1: Calculate the ratio according to the 6A02 alloy bar to be prepared, select a suitable aluminum electrolytic cell for aluminum extraction according to the pre-analysis results of the electrolytic aluminum liquid, and pump the electrolytic aluminum liquid from the electrolytic cell to a vacuum ladle and transport it to casting The workshop is poured into the smelting furnace, using the high-temperature heat of the electrolytic aluminum liquid at 810°C to melt the added aluminum ingots for remelting, and when the temperature of the material in the smelting furnace drops to 760°C, add Cu element additives, Mn element additives, Al-Fe master alloy, Mg ingot, slag removal after stirring and smelting for 15 minutes, to obtain smelt; wherein, the mass ratio of molten aluminum to aluminum ingot for remelting is 100:17;

Take a sample from the smelt for quick analysis, and the composition meets the composition requirements of the aluminum alloy, so the smelt is transferred to a static furnace;

Step S2: Put the powdery refining agent (produced by Yantai Xing Aluminum Metal Material Co., Ltd.) into the powder spraying tank at an amount of 2kg/t, connect the "T" type refiner and the powder spraying tank firmly, and insert it into the standing furnace for smelting In the object, open the gas valve of the gas bottle, operate the "T" type refiner to move back and forth in the static furnace, and ensure that it is refined at 740°C for 18 minutes; among them, the gas bottle is filled with nitrogen with a purity of 99.99%. The pressure in the bottle is 0.4MPa, and the flow rate of the ejected gas is 5.5m ³ /h;

After the above operations, sprinkle the covering agent on the surface of the melt and let it stand for 13 minutes. The mass ratio of the covering agent (the main components include KCl, MgCl ₂ and CaF ₂ ) to the melt is 0.3:100;

Step S3: Keep the temperature of the refined melt at 720°C, blow nitrogen gas with a purity of 99.99% from the bottom of the melt from bottom to top, then heat a 40ppi foam ceramic plate to 650°C, filter the melt, Then add Al-Ti-B wire to the melt; wherein, the pressure of nitrogen is 0.4MPa, the flow rate is 5.5m ³ /h, and the mass ratio of melt to Al-Ti-B wire is 100:0.02;

Step S4: casting the melt by using wagstaff casting technology, the casting temperature is 715° C., and the external water cooling of the casting mold used during casting;

Step S5: remove the surface segregation layer of the ingot obtained by casting and the removal amount of the segregation layer on the surface of the ingot is 2mm, ensure that the surface roughness of the ingot is Ra12.5, and ensure that the outer surface of the ingot is clean, and then the ingot Cut into short rods of Φ410×1000mm;

Use an induction furnace to heat the short rod to 460°C and extrude it on a 55MN forward extrusion machine at a speed of 2m/min. After the product flows out of the die hole, control the product outlet temperature when the metal temperature is 460°C , traction and stretching, the traction speed is synchronized with the product extrusion speed, weak air cooling;

Then quench the short rod in the air furnace, the quenching heating temperature is 520 ° C, the holding time is 200 minutes, and then 1.5% stretching and straightening is carried out;

Then keep it warm at 155°C for 8 hours, and take samples for testing after cooling in air.

This embodiment has carried out repeated test, prepared twice according to the above-mentioned operation steps, and the 6A02-T6 alloy rods obtained twice all meet the composition and performance requirements, and its mechanical performance results are shown in Table 2:

Table 2 Mechanical properties

Sample No. σb MPa δ% HB 001 385 15 117 002 383 12 117

It can be seen from the above table that by adopting optimized components, combined with extrusion and heat treatment technology, the problem of mechanical properties of 6A02 alloy has been solved, and a reasonable process plan has been formulated. We have mastered the key technology of high-strength aluminum rod production, and obtained materials whose performance, structure, size and surface have reached the advanced level of similar foreign products.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a kind of production technology of 6A02 alloy bar materials, it is characterised in that include：

Charging melting step：800～820 DEG C of aluminium liquid is mixed with solid material, is added when temperature is down to 750～770 DEG C and is matched somebody with somebody Material, skims after 10～20min of stir-melting, obtains melting thing；Wherein, the solid material is the alloy board with the aluminium liquid raw material Number identical aluminium waste, the aluminium liquid are 100 with the mass ratio of the solid material：15～20, the dispensing is described for production Necessary other alloying element raw materials of 6A02 alloy bar materials；

Refinement step：The melting thing is mixed with refining agent, 15～20min of refine at 730～750 DEG C, the refining agent With the mass ratio 0.1～0.3 of the melting thing：100；

Optimization step：The temperature for keeping the melt after refine is 715～725 DEG C, the shielding gas using purity more than 99.9% Then body carries out melt filtration from the bottom of melt Degassing process by gassing from lower to upper；Wherein, the protective gas is selected from nitrogen One or more in gas, noble gases, it is 5～6m that the pressure of the protective gas is 0.2～0.6MPa, flow³/h；

Casting step：The melt is cast, casting temperature is 710～720 DEG C, during casting, casting mould used is outer Portion's water-cooled；

Post-processing step：The surface segregation layer of the ingot casting that casting is obtained is removed, heating extruding, quenching, artificial aging is then carried out Process.

2. the production technology of 6A02 alloy bar materials according to claim 1, it is characterised in that the aluminium waste is selected from remelting With one or more in aluminium ingot, ingot casting saw cutting head tailing, hot-rolled thick plank crop tailing.

3. the production technology of 6A02 alloy bar materials according to claim 1, it is characterised in that the dispensing is selected from aluminium alloy One or more in element additive, Al-Fe intermediate alloys, Al-Cu intermediate alloys, Al-Si intermediate alloys, Mg ingots.

4. the production technology of 6A02 alloy bar materials according to claim 1, it is characterised in that in the refinement step, It is injection refining method by the method for the melting thing and the refining agent mixing refine, by the melting thing and the refining agent After mixing refine, the refinement step also includes：The bath surface after refine spreads fertilizer over the fields coverture, stand 10～ 15min, the coverture are 0.2～0.4 with the mass ratio of the melt：100.

5. the production technology of 6A02 alloy bar materials according to claim 1, it is characterised in that in the optimization step, It is that the foamed ceramic panel of 35～45ppi is heated to into 600～750 DEG C, melt filtration is carried out to the melt then.

6. the production technology of 6A02 alloy bar materials according to claim 1, it is characterised in that in the optimization step, After melt filtration is carried out to the melt, also include：Alterant, the melt and the alterant are added toward the melt Mass ratio be 100：0.01～0.03.

7. the production technology of 6A02 alloy bar materials according to claim 1, it is characterised in that in the post-processing step, After quenching, before artificial aging process, also including stretching.

8. the production technology of 6A02 alloy bar materials according to claim 1, it is characterised in that the post-processing step bag Include：The ingot casting is cut into into stub after the surface segregation layer for removing the ingot casting that casting is obtained, 450～470 are heated to Carry out forward extrusion after DEG C, the speed of forward extrusion is 1～3m/min, then the stub is carried out quenching, stretched, 150～ 7～9h is incubated at 160 DEG C, is detected after air cooling.

9. a kind of 6A02 alloy bar materials, it is characterised in that by the 6A02 alloy bar materials described in any one of claim 1～8 Production technology is obtained.

10. 6A02 alloy bar materials according to claim 9, it is characterised in that percentage, composition include：Si 0.9～1.10%, Fe 0.20～0.40%, Cu 0.40～0.55%, Mn 0.20～0.30%, Mg 0.60～0.80%, Zn≤0.20%, Ti≤0.15%, remaining impurity≤0.15% and Al surpluses.