... . Steel Castings sand mould making High-precision large ring gear tooth occlusal accuracy of the advanced world. Steel CastingsEfficiency: Annual ... body, valve body etc. for petrochemical industry working.(5) Gear, Bull Gear, axial seat, big shaft, block, module etc.(6) ... inspection. Mass guarantee ability: Already get ABS ISO9001-2008 quality system certification , having declared NK,DNV,BV,ABS,CCS ...