The pump casing, impeller, motor housing and stationary base elbow shall be manufactured of close-grained cast iron, ASTM A48, Class 30.
泵壳，叶轮，电机壳和固定底座弯头都应该采用符合美国材料试验协会ASTM A48级别30致密铸铁制造。
The submersible motor enclosure including frame, end brackets, flanges and cap assembly shall be constructed of close-grained cast iron, ASTM A-48, Class 30 or better.
潜水电机壳体，包括机架，尾轴承架，法兰和罩盖总装，必须采用符合美国材料试验协会ASTM A - 48类别30标准的、密实的铸铁或更好的材料制造。
HONIC 400 is not only recommended for cylinder honing on hard, soft and close-grained cast iron but also for flat honing and lapping operations on gauge blocks and gudgeon pins.
雄力400不但推荐于硬质及软质铸铁的汽缸内径搪磨，还适用于块规的平面精磨及轴头销的研光工序。
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