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Preparation method for 7-series aluminum alloy

A technology for aluminum alloy and aluminum alloy ingot casting, which is applied in the field of aluminum alloy and can solve the problems of low degree of alloying, no more than 5%, etc.

Active Publication Date: 2015-05-13
山东兖矿轻合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the ingots produced directly by electrolytic aluminum liquid at home and abroad are mainly aimed at aluminum alloys with a low degree of alloying, and the content of alloy elements generally does not exceed 5%. There are few reports on welding 7xxx series aluminum alloys

Method used

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  • Preparation method for 7-series aluminum alloy
  • Preparation method for 7-series aluminum alloy
  • Preparation method for 7-series aluminum alloy

Examples

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preparation example Construction

[0023] The invention discloses a method for preparing a 7-series aluminum alloy, which comprises the following steps: alloying electrolytic aluminum liquid, Zn, Mg and Al-Mn intermediate alloy in a smelting furnace to obtain a first alloy melt; The first alloy melt is refined, degassed, slag removed, stirred and slag removed in a tiltable holding furnace, and the Al-Ti-B master alloy is added for refinement treatment to obtain the second alloy melt; The continuous casting method casts the second alloy melt to obtain a 7-series aluminum alloy ingot.

[0024] In the above preparation process, the temperature of the first alloy melt is preferably 740-760°C, more preferably 740-750°C. Since the temperature of the electrolytic aluminum liquid is relatively high, the present invention preferably utilizes the method of adding cold material to control the temperature of the first alloy melt. Specifically, the present invention also preferably includes: adding an aluminum ingot to the ...

Embodiment 1

[0032] Add industrial pure Mg, industrial pure Zn and Al-10Mn intermediate alloy to the high-temperature electrolytic primary aluminum liquid, and directly alloy it in the melting furnace. At the same time, add a small amount of pure aluminum ingots to control the temperature of the aluminum melt at 740 ° C ~ 750 ° C, fully stir , slag removal, sampling and testing of components, and then poured into a tiltable holding furnace for refining, degassing, slag removal, stirring, slag removal and then standing still;

[0033] The alloy melt after the above treatment is degassed and slag-removed by on-line rotary spraying of argon gas, filtered by a ceramic filter plate, and then cast by a semi-continuous casting method. The steps are as follows:

[0034] The temperature of the melt is controlled at 710-720°C. During casting, Al-Ti-B wire is added online to refine the melt, combined with the use of water baffles for oily casting, the casting speed is controlled at 10mm / min-20mm / min, ...

Embodiment 2

[0036] Add industrial pure Mg, industrial pure Zn and Al-10Mn intermediate alloy to the high-temperature electrolytic primary aluminum liquid, and directly alloy it in the melting furnace. At the same time, add a small amount of pure aluminum ingot to control the temperature of the aluminum melt at 750 ° C ~ 760 ° C, fully stir , slag removal, sampling and testing of components, and then poured into a tiltable holding furnace for refining, degassing, slag removal, stirring, slag removal and then standing still;

[0037] The alloy melt after the above treatment is degassed and slag-removed by on-line rotary injection of argon, filtered by a ceramic filter plate, and then cast by semi-continuous casting method. The steps are as follows:

[0038] Control the temperature of the melt at 710°C to 715°C, add Al-Ti-B wire online to refine the melt during casting, and use water baffles for oily casting, and control the casting speed at 10mm / min to 25mm / min. The amount of cooling water ...

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Abstract

The invention discloses a preparation method for 7-series aluminum alloy, which comprises the following steps, alloying electrolytic aluminum liquid, Zn, Mg and Al-Mn intermediate alloy in a smelting furnace, and obtaining a first alloy solution; after the first alloy solution undergoes refining, degassing, deslagging, stirring and slagging-off treatment in a tipping type heat preserving furnace, adding Al-Ti-B intermediate alloy, performing refining treatment, and obtaining a second alloy solution; and utilizing a semicontinuous casting method to cast the second alloy solution, and obtaining 7-series aluminum alloy ingots. The preparation method for 7-series aluminum alloy utilizes the electrolytic aluminum liquid to serve as a raw material, and the7-series aluminum alloy ingots are prepared in the semicontinuous casting method. Experiment results prove that the 7-series aluminum alloy ingots have the advantages that the chemical components are good in stability, the surface quality of the ingots is good, an ingot microstructure is uniformized and compact, the hot working performance is good, and the like. More importantly, the diameter of each prepared alloy ingot can be 817mm, the length of each ingot is 6.5-7m, and the alloy ingots are of great significance to production of large members in China.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a method for preparing a 7-series aluminum alloy. Background technique [0002] The 7-series aluminum alloys with a total zinc and magnesium content between 5.0% and 6.5% and basically no Cu are usually called medium-strength weldable 7-series aluminum alloys in the field of aluminum processing, also known as 7xxx series aluminum alloys. Natural strengthening ability and medium strength, its tensile strength is between 294.0-441.0MPa, and the softening caused by the welding process can recover by itself after sufficient natural aging. It is suitable for the manufacture of welded components that are inconvenient to be heat treated after welding. The main lightweight welded structural materials for equipment, aerospace vehicles, military ships and civilian ships. [0003] The origin of the medium-strength weldable 7-series aluminum alloy can be traced back to the Al-Zn-Mg ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03B22D11/04
Inventor 孙振宇冯彦波聂波鹿兵英卫东周庆波杨富波吴茂来韦艳琴王涛田妮韩正乾赵荣涛孔令军王德来牛长雷刘井军杨枭李令远邓延波李士海冯骥王玉刚鞠克江张寒张小刚王志波魏凯歌白凯刘博秦剑欧庆峰李健田鹏董瑞峰孔丽
Owner 山东兖矿轻合金有限公司