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R crusher wear parts reference guide,manganese loses its ductility. for manganese to work the skin has got to be very hard, and abrasive resistant, but the core needs to be as ductile and as soft as chewing gum. If manganese is misapplied there is a serious risk of losing this innate ductility that must be at the core. rock types manganese content hard & abrasive rock hard & non
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