... steel sheet,average of initial hardness are 200HBW , shock resistance and wear restistance,have high tensile strength、plastic and toughness and non ... load of non-broken, they use to the wear-out parts of impact resistance ,such as scaleboard of shot-blasting machine, ... always use to make simply structure ,the forging which request wear-resistance of low impact,such as scaleboard , pinion rack,the wall ...