华民磨球含铬量较合适塑性较为不错不易变形保持形状

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Shandong china steel balls inc

Address:The chinese steel ball is 10061 on the 10th east road
Tel:18560172019

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18560172019

华民 磨球 含铬量较合适 塑性较为不错 不易变形保持形状