The good effect has been gained on the hypereutectic Al Si alloys treated with some double refining and modifying agents such as P, S, RE, Sr, Na, C, etc.

采用磷、硫、稀土、锶、钠、碳等进行双重细化变质处理过共晶铝硅合金已取得了良好的效果。

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Double metal rolling fin tubes are widely used in refining, chemical, power plant and many other industries because they have good heat transfer, mechanical, anti-corrosion performance.

双金属轧制翅片管以其优良的传热性能、机械性能和耐腐蚀性能在许多工业领域，特别是炼油、化工、发电行业得到了广泛应用。

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This paper recommended a kind of agent of fusion and it's adding technolgy, which had double actions of depressing magnesium content and refining in molten aluminium alloy.

本文论述了一种在铝合金中同时具有除镁和精炼双重作用的熔剂。

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