... Manganese Steel Process: Heat Treatment Hardness: 38 to 45 HRC TYPE: PLAIN AND NOTCHED... thickness:you can choose from 3mm to ... and anual producition 1000, 000pcs ,the disc plough and harrow blade exported to USA, Britian, France, Africa, South America, Austrilia Since ... , we have passed the impact test of the disc blade ,so the disc blade is of high quality . Product name: harrow disc ...