... Ra0.2 .Ceramic ring is matched with high-speed bearings, the baffle on the both sides can prevent enameled ... chemical, railways, textile machinery,chemical mechanical winding machine, wire and cable machinery, burners, fishery machinery, Tin Machine, wire drawing ... 557124HardnessHRA≥86≥88≥89≥9088-90Modulus of elasticityGPa3203503903002205coefficient of linear expansion X10-6/k 6.5-11.26Minimal residual ...