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the general name for a group of aluminum-base casting alloys containing silicon (4-13 percent; up to 23 percent in certain grades). The group is alloyed with Cu, Mn, and Mg and sometimes with Zn, Ti, Be, and other metals, depending on the desired combination of fabricating characteristics and operational performance. Silumin alloys have good casting properties, but their mechanical properties are inferior to those of casting alloys based on the Al-Cu system.
Silumin alloys are noted for their high resistance to corrosion in humid and marine atmospheres. They are used in the manufacture of components with complex shapes, mainly in automotive vehicle and aircraft manufacture. The USSR produces silumin alloys under such trade names as AL2, AL4, and AL9. [23–1097–]