... certificate:ISO9001:2008 Type: Sheet-metal Product Custom made mould Dongguan Richhong metal Co. ... Ductile iron; Malleable iron; Tungsten steel, etc.Machining processesMetal fabrication, machining, welding, forming, shaping, punching, drilling, turning ... , spot or seam welding, spinning, forging, sand casting, die casting, investment casting, etc.Surface treatmentPolishing, zinc plating, nickel plating ...