For galvanized fence products, galvanized surface layer is more important, with the development of the fence, but also to better use in the future to play a role guardrail. So for the production of such production also will make a better development, galvanized fence heat to how we proceed? In order to make a more uniform, please see the following Xiaobian to answer your questions. Taking into account the non-uniform wall thickness of the casting, heating, cooling and phase transformation process, we need considerable attention. Otherwise it will have an effect and organizational stress. Also after the machining of large parts of its interior is also easy to residual stress, 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 can eliminate 90 to 95% by casting stresses, but cast iron does not occur. If the temperature exceeds 550 ℃ or the holding time is too long, it will lead to graphite, the casting strength and hardness decreased. In casting cooling, they also need to pay attention at the surface of thin sections, tend to produce white. White tissue hard and brittle, poor processing performance, easy to peel off. All in all, if you want to make galvanized guardrail play better results, we must note that galvanized this step. The scientific advances in the development process, the galvanized fence can get better development. Better application of this technique. For production applications are also able to have a better help, such use is to have a good help. Linqu Kuang Tai Metal Products http://www.guangtaihulan.net/ galvanized fence manufacturers, manufacturers of cast iron fence, spray fence manufacturers, manufacturers of zinc steel guardrail, fence manufacturers in Shandong