2、 半自磨钢球铸造钢球(cast grinding balls)Ф17mm—130mm执行GB/T17445-2009(最高最新标准) ①、原材料:华民铸造铁球原材料选用优质费铁，优质铬铁
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公司现有铸造钢球生产线两条，锻造钢球生产线三条，回火线一条。
Now our company has two casting steel ball production lines, three forging steel ball production lines, one temper line.
大小皮带轮采用稀土球墨铁铸造，既方便加工，又使皮带轮具有钢的性能强度好。
The use of rare earth ball size pulley ink iron casting, both for the convenience of processing, but also so that the performance of steel pulley with good intensity.
该DM 6.0建立牢固的铸造锌合金机身，钢网罩和内部球弹出屏幕。
The DM6.0 is built solidly with a cast zinc alloy body, steel mesh grille ball and internal pop screen.
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