Formula and production process of aluminum-strontium intermediate alloy ingot

Abstract

The invention discloses a formula of an aluminum-strontium intermediate alloy ingot and further discloses a production process thereof. The formula of the aluminum-strontium intermediate alloy ingot is that electrolytic aluminum: metal strontium is equal to 1: 24-0.28. The production process of the aluminum-strontium intermediate alloy ingot comprises the following steps of smelting, melt purification, nitrogen protection, electromagnetic stirring alloying, refining, standing, casting and inspection. The invention improves the content of effective elements in aluminum-strontium alloy, reduces harmful gas in alloy liquid and solves the defects of poor liquidity, volume expansion, generation of segregation precipitate and so on in the alloy liquid. The strontium content is higher than that of the traditional AlSr10 alloy by about 10 percent. Compared with the traditional AlSr10 leavening agent, the using amount is reduced by about 50 percent. The reduction of the adding amount of the aluminum-strontium intermediate alloy ingot leads impurities and gas which are brought into aluminum liquid by the alloy to be reduced by about 50 percent, thereby improving the product quality.

Description

technical field [0001] The present invention relates to a formula for a non-ferrous metal modifier master alloy ingot, in particular to a formula for an aluminum-strontium master alloy ingot for casting an aluminum-silicon alloy; the invention also relates to a process for making an aluminum-strontium master alloy ingot according to the formula . Background technique [0002] Cast aluminum-silicon alloy has the advantages of low density, high strength, wear resistance, good heat resistance, and low thermal expansion coefficient, so it is a type of alloy with the widest application range and the largest output among cast aluminum alloys. However, with the increase of silicon content in aluminum-silicon alloys, a large amount of needle-like eutectic silicon appears in the structure, and even coarse polygonal block primary silicon appears, which severely splits the matrix and significantly reduces the mechanical properties of the alloy, especially the plasticity. , Machinabili...

AI Technical Summary

Problems solved by technology

But find through long-term production practice: the AlSr10 modificator used in the prior art has the following deficiencies in the production process and product formula: the one, the production technology of the AlSr10 modificator of the prior art is open production, does not carry out gas protection, The affinity between strontium and oxygen increases greatly, and with the increase of the concentration of strontium element, the gas content and slag content of the product increase greatly

Therefore, the traditional process is not suitable for the production of aluminum-strontium alloys with a strontium content of more than 13%

The second is that the AlSr10 alloy of the prior art is used in a high amount when the cast aluminum-silicon alloy is modified, and the general amount is 2.5‰, which increases the product cost, and the amount of impurities and gases brought into the aluminum liquid by the aluminum-strontium alloy is high.

The third is that the AlSr10 modification agent production process of the prior art does not carry out gas protection, and the metal strontium of each furnace is added at one time, and artificially stirred, the gas and inclusion content increase, and the uniformity of alloying is reduced.