... Sand casting 2.Gravity pouring 3.CNC, Machining Center 4.Inspected by CMM 5.Smooth surface, Drill and ream holes Cylinder Sand casting ... quality control process and manufacture process have been established.3. Our quality management system is in conformance with ISO9001:2000, ISO TS ... 4140, 4330, 4620, 52100, 6120, 6150, 8620Stainless steels & Heat resisting steels 303, 304, 309, 314, 316,316L, 410, ...