齿轮齿圈和蜗轮轮缘及其他磨擦付的零件承受的单位载荷较高,一般高磷耐磨铸铁的脆性大满足不了要求,因而试验用高磷含铜铁素体球墨铸铁代替青铜.一般认为,铸铁中同时 Gear ring gear and worm wheel flange and other friction-bearing parts to bear the higher unit load, the general high phosphorus wear-resistant cast iron brittle enough to meet the requirements, and therefore test high phosphorus ferrite containing ductile iron instead of bronze is generally believed that At the same time, cast iron