Profile: Ninghai Jinma Casting Co,. Ltd is a casting manufacturer. We offer ductile cast iron, grey cast iron, cast steel, brass casting, and bronze casting. HT castings are gray iron castings, whose graphite form is in the form of flakes, so metal matrix structure elements exit in the grey cast iron with a fragmented state, the effective area of the load is reduced. Grey cast iron is mainly used for manufacturing some based parts needing strong pressure, such as beds, boxes, bases, and guide rails.