Hebei Goldpro New Materials Technology Co., Ltd.
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Place of Origin: | Hebei, China (Mainland) |
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Size: 20mm -150mmHardness: HRC58-65;chemical elements:C: 0.50-0.56; Si: 0.15-0.36; Mn: 0.5-1.7; S & P: 0.036Max; Cr: 0.25Max.
http://www.chinagrindingball.com