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Our company adopts the production process of self-made cold coal gas hot reduction and production cost is reduced sharply. Especially the zinc port system adopting the most advanced hot technology and coating material at home realized precise control to the temperature of the port as well as large extent reduction to the production cost. Our company continuously tests and improves the passivation and unction process, choosing high-quality passivation liquor and rust inhibiting oil. Products using this process are popular among customers both at home and abroad, for they can keep nondiscolouring and nonrust permanently even in the very dampy districts like Southeast Asia, South Asia and our countrys coastal area.