Also very long life galvanized fence preservative, is widely used in power transmission tower, railway, telecommunications tower and lampposts and other structures in the hot dip galvanized fence manufacturers, each part of the fence are coated with zinc up , whether it is depression or sharp corners can receive comprehensive protection and galvanized hot dip galvanized fence of the process is relatively quick and easy hot dip galvanized fence, avoid installation on site at the time of need, very convenient. Heat galvanized fence: Because the casting wall thickness uneven heating hot dip galvanized fence Weifang, cooling and phase change process, will produce effects and organizational stress. Also after the machining of large parts of its internal residual stress is also easy, all of which stress must be eliminated. Stress relief annealing heating temperature is generally 500 ~ 550 ℃ holding time of 2 ~ 8h, and then furnace cooling, using this technology eliminates 90 to 95% by casting stresses, the cast iron structure, but does not change. If the temperature exceeds 550 ℃ or holding time is too long, it will lead to graphite, the casting strength and hardness decreased. When casting cooling spray galvanized fence wholesale, surface and thin section was often produce white. White tissue hard and brittle, poor processing performance, easy to peel off. Therefore must annealing method to eliminate white tissue. During the high-temperature insulation, high travel cementite eutectic cementite decomposition and graphite, in the subsequent cooling process protection and secondary cementite eutectoid cementite decomposition also occurs graphitization process. Due to the decomposition of cementite, resulting in decrease in hardness, thereby improving the machinability. Hot dip galvanized fence prices, hot dip galvanized guardrail, St. Ye metal (view) by Linqu St. Ye metallwarenfabrik. Linqu St. Ye metallwarenfabrik (www.shengyehl.com) provide customers with "zinc steel fence, galvanized fence, spray fence, cement fence" and other services, the company has "Ye Holy fence" and other brands. Focused on metal building materials industries, have higher visibility in Weifang, Shandong. Welcomes inquiries, contact: Zhaoxiang Wang.