... chrome plating, yellow passivation, gold passivation, galvanizing, satin, etc.Processing Methodcnc machining, turning, milling, drilling, grinding, broaching, welding and ... of China. 2. Hangzhou city which is famous for heavy industry city in China. 3. We are a ... , metal stamping, thread cutting tools, sheet metal production processing factory. 5.can assure the mechanical properties and chemical ...