Materialï¼?steel Surface Hardnessï¼?HRC55-65 Impact toughnessï¼?>12j/cm2 Chemical elementsï¼?C Si Mn P S Cr v Endurance impact testï¼?>13000 Shipping: 1.Port of Loading: Qingdao Port,China 2.Partial shippment allowed 3.By DHL/TNT express for samples order.Door to door to delivery; 4.Appointed freight forwarder by customers is acceptable Delivery time: 1.7-45days according to your quantity 2.5-10days for sample orders; 3.Specified goods up to detailed order quantity. Company Information 1.Professional Grinding balls Manufactory founded in 1981; 2.Advanced production equipment; 3.Exported more than 20 countries; 4.Experienced development personnel,professional designers,salesman and skilled workers 5.Capacity:10000mt/month.