阅读说明：本技术 螺旋焊接管用高电导率铝镁合金及其生产方法 (High-conductivity aluminum-magnesium alloy for spiral welded pipe and production method thereof ) 是由 孔军 黄媚 陈登斌 章国华 许泽辉 曹城 陈培显 汤波楷 于 2020-04-23 设计创作，主要内容包括：本发明提供了一种螺旋焊接管用高电导率铝镁合金及其生产方法,其中各组分的质量百分比为：硅≤0.10％、铁≤0.10％、铜≤0.001％、锰≤0.001％、镁2.6-3.0％、锌≤0.002％、钒≤0.001％、铬≤0.001％,余量为铝和不可避免杂质；生产其合金步骤为：配料,然后进行熔炼精炼；向精炼后的熔体中加入纯惰性气体并搅拌以去除杂质气体,利用陶瓷双级过滤板过滤熔体；过滤后的熔体进行铸造以形成铝镁合金铸锭,控制铸锭的晶粒度等级≥3级；铸锭经过双级均匀化处理；然后出炉进行热轧以形成厚度为6-10mm的铝镁合金热轧卷。与相关技术相比,本发明利用此生产方法制得的螺旋焊接管用高电导率铝镁合金在保证抗拉强度的同时提高电导率。(The invention provides a high-conductivity aluminum-magnesium alloy for a spiral welded pipe and a production method thereof, wherein the high-conductivity aluminum-magnesium alloy comprises the following components in percentage by mass: less than or equal to 0.10 percent of silicon, less than or equal to 0.10 percent of iron, less than or equal to 0.001 percent of copper, less than or equal to 0.001 percent of manganese, 2.6 to 3.0 percent of magnesium, less than or equal to 0.002 percent of zinc, less than or equal to 0.001 percent of vanadium, less than or equal to 0.001 percent of chromium, and the balance of aluminum and inevitable impurities; the alloy is produced by the following steps: preparing materials, and then carrying out smelting refining; adding pure inert gas into the refined melt, stirring to remove impurity gas, and filtering the melt by using a ceramic double-stage filter plate; casting the filtered melt to form an aluminum magnesium alloy ingot, and controlling the grain size grade of the ingot to be more than or equal to grade 3; carrying out two-stage homogenization treatment on the cast ingot; and then discharging the aluminum-magnesium alloy from the furnace and carrying out hot rolling to form an aluminum-magnesium alloy hot rolled coil with the thickness of 6-10 mm. Compared with the prior art, the high-conductivity aluminum-magnesium alloy for the spiral welded pipe prepared by the production method disclosed by the invention has the advantages that the tensile strength is ensured, and the conductivity is improved.)

1. A production method of high-conductivity aluminum-magnesium alloy for a spiral welded pipe is characterized by comprising the following steps:

step S1, batching: the aluminum magnesium alloy is prepared from the following components in percentage by mass: less than or equal to 0.10 percent of silicon, less than or equal to 0.10 percent of iron, less than or equal to 0.1 percent of copper, less than or equal to 0.15 percent of manganese, 2.6 to 3.0 percent of magnesium, less than or equal to 0.002 percent of zinc, less than or equal to 0.05 percent of vanadium, less than or equal to 0.05 percent of chromium, and the balance of aluminum and inevitable impurities;

step S2, smelting and refining: smelting the aluminum magnesium alloy raw material in a smelting furnace to form an aluminum magnesium alloy melt, wherein the temperature of the aluminum magnesium alloy melt is less than or equal to 750 ℃; pouring the aluminum magnesium alloy melt into a refining furnace for refining for 30 minutes, wherein the temperature of the refined aluminum magnesium alloy melt is more than or equal to 720 ℃, and the refined aluminum magnesium alloy melt is kept stand for 30-40 minutes at the temperature of 720 ℃;

step S3, degassing and deslagging: adding pure inert gas into the refined aluminum magnesium alloy melt, stirring the aluminum magnesium alloy melt to remove impurity gas, and filtering the stirred aluminum magnesium alloy melt by using a ceramic double-stage filter plate with the combined grade of 30PPI and 50 PPI;

step S4, casting: casting the filtered aluminum magnesium alloy melt to form an aluminum magnesium alloy ingot, and controlling the grain size grade of the aluminum magnesium alloy ingot to be more than or equal to grade 3;

step S5, homogenization: sawing and milling the aluminum magnesium alloy ingot, then feeding the aluminum magnesium alloy ingot into a heating furnace for heat preservation, carrying out homogenization treatment on the aluminum magnesium alloy ingot by adopting a low-temperature and high-temperature two-stage homogenization process, and preserving heat for 6-15 hours;

step S6, hot rolling: discharging the homogenized aluminum-magnesium alloy ingot, and performing rough rolling at 480 +/-10 ℃ to form an aluminum-magnesium alloy intermediate blank with the thickness of 30-35 mm, wherein the temperature of the aluminum-magnesium alloy intermediate blank is 400-420 ℃; and finally, carrying out finish rolling on the aluminum-magnesium alloy intermediate blank at the temperature of 340 +/-10 ℃ to form an aluminum-magnesium alloy hot rolled coil with the thickness of 6-10 mm.

2. The method for producing the high-conductivity aluminum-magnesium alloy for the spiral welded pipe according to claim 1, wherein the aluminum-magnesium alloy raw material comprises the following components in percentage by mass when step S1 is performed: less than or equal to 0.10 percent of silicon, less than or equal to 0.10 percent of iron, less than or equal to 0.001 percent of copper, less than or equal to 0.001 percent of manganese, 2.6 to 3.0 percent of magnesium, less than or equal to 0.002 percent of zinc, less than or equal to 0.001 percent of vanadium, less than or equal to 0.001 percent of chromium, and the balance of aluminum and inevitable impurities.

3. The method for producing a high-conductivity aluminum-magnesium alloy for spiral welded pipes as claimed in claim 1, wherein step S2 further comprises adding a zinc remover and an aluminum-boron alloy during melting to remove zinc and vanadium from the aluminum-magnesium alloy melt.

4. The method for producing a high-conductivity aluminum-magnesium alloy for a spiral welded pipe as claimed in claim 3, wherein the temperature at which the dezincing agent is added is 700 ℃ to 760 ℃; the temperature for adding the aluminum boron alloy is 750-850 ℃.

5. The method for producing a high-conductivity aluminum-magnesium alloy for a spiral welded pipe according to claim 1, wherein the low-temperature and high-temperature two-stage homogenization process of step S5 is performed at a low-temperature stage temperature of 150 ℃ to 300 ℃ and at a high-temperature stage temperature of 450 ℃ to 550 ℃.

6. The method for producing a high-conductivity aluminum-magnesium alloy for a spiral welded pipe according to any one of claims 1 to 5, wherein the aluminum-magnesium alloy raw material is provided with a purity of not less than 99.85% of aluminum and inevitable impurities as the balance.

7. The high-conductivity aluminum-magnesium alloy for the spiral welded pipe is characterized by comprising the following components in percentage by mass: less than or equal to 0.10 percent of silicon, less than or equal to 0.10 percent of iron, less than or equal to 0.001 percent of copper, less than or equal to 0.001 percent of manganese, 2.6 to 3.0 percent of magnesium, less than or equal to 0.002 percent of zinc, less than or equal to 0.001 percent of vanadium, less than or equal to 0.001 percent of chromium, and the balance of aluminum and inevitable impurities.

8. The high-conductivity aluminum-magnesium alloy for a spiral welded pipe according to claim 7, which is produced by the production method for a high-conductivity aluminum-magnesium alloy for a spiral welded pipe according to any one of claims 1 to 6.

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of aluminum alloy, in particular to a high-conductivity aluminum-magnesium alloy for a spiral welded pipe and a production method thereof.

[ background of the invention ]

The spiral welded pipe has high electric conduction and heat conduction capability and strong electromagnetic shielding capability, and is widely applied to power transmission buried pipelines.

[ summary of the invention ]

The invention aims to provide a high-conductivity aluminum-magnesium alloy for a spiral welded pipe with high conductivity and good tensile strength and a production method thereof.

In order to achieve the above object, the present invention provides a method for producing a high conductivity aluminum magnesium alloy for a spiral welded pipe, comprising the steps of:

step S1, batching: the aluminum magnesium alloy is prepared from the following components in percentage by mass: less than or equal to 0.10 percent of silicon, less than or equal to 0.10 percent of iron, less than or equal to 0.1 percent of copper, less than or equal to 0.15 percent of manganese, 2.6 to 3.0 percent of magnesium, less than or equal to 0.002 percent of zinc, less than or equal to 0.05 percent of vanadium, less than or equal to 0.05 percent of chromium, and the balance of aluminum and inevitable impurities;

step S2, smelting and refining: smelting the aluminum magnesium alloy raw material in a smelting furnace to form an aluminum magnesium alloy melt, wherein the temperature of the aluminum magnesium alloy melt is less than or equal to 750 ℃; pouring the aluminum magnesium alloy melt into a refining furnace for refining for 30 minutes, wherein the temperature of the refined aluminum magnesium alloy melt is more than or equal to 720 ℃, and the refined aluminum magnesium alloy melt is kept stand for 30-40 minutes at the temperature of 720 ℃;

step S3, degassing and deslagging: adding pure inert gas into the refined aluminum magnesium alloy melt, stirring the aluminum magnesium alloy melt to remove impurity gas, and filtering the stirred aluminum magnesium alloy melt by using a ceramic double-stage filter plate with the combined grade of 30PPI and 50 PPI;

step S4, casting: casting the filtered aluminum magnesium alloy melt to form an aluminum magnesium alloy ingot, and controlling the grain size grade of the aluminum magnesium alloy ingot to be more than or equal to grade 3;

step S5, homogenization: sawing and milling the aluminum magnesium alloy ingot, then feeding the aluminum magnesium alloy ingot into a heating furnace for heat preservation, carrying out homogenization treatment on the aluminum magnesium alloy ingot by adopting a low-temperature and high-temperature two-stage homogenization process, and preserving heat for 6-15 hours;

step S6, hot rolling: discharging the homogenized aluminum-magnesium alloy ingot, and performing rough rolling at 480 +/-10 ℃ to form an aluminum-magnesium alloy intermediate blank with the thickness of 30-35 mm, wherein the temperature of the aluminum-magnesium alloy intermediate blank is 400-420 ℃; and finally, carrying out finish rolling on the aluminum-magnesium alloy intermediate blank at the temperature of 340 +/-10 ℃ to form an aluminum-magnesium alloy hot rolled coil with the thickness of 6-10 mm.

Preferably, in the step S1, the aluminum magnesium alloy raw material comprises the following components by mass percent: less than or equal to 0.10 percent of silicon, less than or equal to 0.10 percent of iron, less than or equal to 0.001 percent of copper, less than or equal to 0.001 percent of manganese, 2.6 to 3.0 percent of magnesium, less than or equal to 0.002 percent of zinc, less than or equal to 0.001 percent of vanadium, less than or equal to 0.001 percent of chromium, and the balance of aluminum and inevitable impurities.

Preferably, step S2 further includes adding a zinc removing agent and an aluminum boron alloy during the melting process to remove zinc and vanadium from the aluminum magnesium alloy melt.

Preferably, the temperature for adding the zinc removing agent is 700-760 ℃; the temperature for adding the aluminum boron alloy is 750-850 ℃.

Preferably, when the low-temperature and high-temperature two-stage homogenization process of step S5 is performed, the temperature of the low-temperature stage is 150 ℃ to 300 ℃, and the temperature of the high-temperature stage is 450 ℃ to 550 ℃.

Preferably, when the aluminum-magnesium alloy raw material is prepared, the balance is aluminum and inevitable impurities, and the purity of the aluminum is more than or equal to 99.85%.

The invention also provides a high-conductivity aluminum-magnesium alloy for the spiral welded pipe, which comprises the following components in percentage by mass: less than or equal to 0.10 percent of silicon, less than or equal to 0.10 percent of iron, less than or equal to 0.001 percent of copper, less than or equal to 0.001 percent of manganese, 2.6 to 3.0 percent of magnesium, less than or equal to 0.002 percent of zinc, less than or equal to 0.001 percent of vanadium, less than or equal to 0.001 percent of chromium, and the balance of aluminum and inevitable impurities.

Preferably, the high-conductivity aluminum-magnesium alloy for the spiral welded pipe is prepared by the production method of the high-conductivity aluminum-magnesium alloy for the spiral welded pipe.

Compared with the prior art, in the production method of the high-conductivity aluminum-magnesium alloy for the spiral welded pipe, the coarse grain structure is formed by controlling the grain size grade of the aluminum-magnesium alloy cast ingot to be more than or equal to 3 grade; meanwhile, the technological parameters such as rough rolling temperature, thickness of the aluminum-magnesium alloy hot rolled coil, finishing rolling temperature and the like are controlled, and the coarse grain structure is reserved to produce the high-conductivity aluminum-magnesium alloy for the spiral welded pipe. The high-conductivity aluminum-magnesium alloy for the spiral welded pipe further improves the conductivity of the alloy while ensuring the stronger tensile strength of the alloy.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic flow chart of the production method of the high-conductivity aluminum-magnesium alloy for the spiral welded pipe of the present invention.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.