Hot dip galvanized fence manufacturer, hot dip galvanized guardrail, St. yup yup metal provided by Linqu St. metallwarenfabrik. Road Zhiyuan, tempering forward. Linqu St. Ye metallwarenfabrik (www.shengyehl.com) to become and you win, symbiosis, strategic partners before the trip, the more determined to become the most influential metal building materials business, and you leap together to success! galvanized fence coating analysis: 1, hot dipped zinc coating: hot galvanized fence invasion galvanic zinc coating plays a protective effect from the inside to the outside to prevent rusting steel substrate. 2, zinc-phosphate layer: This layer of galvanized fence can enhance the adhesion of the coating and the substrate. 3, organic zinc epoxy powder coating: galvanized guardrail excellent corrosion resistance and anti-impact performance is to have this layer causes. Heat galvanized fence: casting wall thickness due to uneven heating, 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 usually 500 ~ 550 ℃ holding time of 2 ~ 8h wholesale hot dip galvanized guardrail, and then furnace cooled hot dip galvanized fence Weifang price, using this technology can eliminate the stress of casting 90 ~ 95% hot dip galvanized fence, but the cast iron structure 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, surface and thin section was often produce white. White tissue hard and brittle, poor processing performance, easy to peel off. Therefore annealing method must be used to eliminate white tissue. During the high-temperature insulation, high travel cementite eutectic cementite decomposition of graphite spray Weifang galvanized guardrail, nursing a cold during the subsequent secondary cementite and eutectoid cementite decomposition also occurred graphitization process. Due to the decomposition of cementite, resulting in decrease in hardness, thereby improving the machinability.