High zinc-aluminum alloy cast rod added with scandium element and smelting and casting methods of high zinc-aluminum alloy cast rod

Abstract

The invention discloses a high zinc-aluminum alloy cast rod added with the scandium element. The high zinc-aluminum alloy cast rod comprises, by mass percent, 10.95%-11.55% of Zn, 2.1%-2.3% of Mg, 0.5%-0.7% of Mn, 0.14%-0.16% of Sc, 1.5%-2.5% of Cu, 0.014%-0.016% of Ti, 0.014%-0.016% of B, 0.003%-0.004% of Be, 0.07%-0.09% of Zr and the balance Al. The cast rod has few defects, the material performance is improved, and the requirements for the mechanical performance and corrosion resistance of an aluminum alloy in the aviation field and the ship field are met. The rare earth scandium element isadded in the proportion, and the strength, hardness and welding performance of the aluminum alloy cast rod are improved. The invention further discloses a smelting method of the aluminum alloy cast rod. The uniformity degree of various components in the aluminum alloy can be improved, the stability and compactness of the produced aluminum rod can be improved, and redundant impurities can be removed; and in the smelting process, zircon salt is added, and corrosion resistance of the surface of a finished product can be improved. The invention further discloses a casting method of the aluminum alloy cast rod. The casting efficiency can be improved, energy consumption can be reduced, and generated waste water can be reduced.

Description

【Technical field】 [0001] The invention relates to a high-zinc aluminum alloy cast rod added with scandium element, and also relates to a melting method and a casting method of the high-zinc aluminum alloy cast rod added with scandium element. 【Background technique】 [0002] Al-Zn-Mg-Cu series aluminum alloy is a high-strength deformable superhard aluminum alloy that can be strengthened by heat treatment. and other fields. [0003] However, in the process of smelting and casting Al-Zn-Mg-Cu aluminum alloy, if the method is not selected properly, many unnecessary defects will be caused in the cast rod, mainly reflected in the unstable mechanical properties of the finished product, coarse grains, etc. Therefore, it is very necessary to invent a suitable casting method to reduce the defects of cast rods for the smelting field of Al-Zn-Mg-Cu aluminum alloys. [0004] Scandium is one of the rare earth elements. Adding a small amount of scandium in the smelting process of aluminu...

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Problems solved by technology

[0003] However, in the process of smelting and casting Al-Zn-Mg-Cu aluminum alloy, if the method is improperly selected, many unnecessary defects will be caused in the cast rod, mainly reflected in the unstable mechanical properties of the finished product, coarse grains, etc. Therefore, it is very necessary to invent a suitable casting method to reduce the defects of cast rods for the smelting field of Al-Zn-Mg-Cu aluminum alloys