St. Ye metal, hot-dip galvanizing spray fence manufacturers, Linyi galvanized fence spray provided by Linqu St. Ye 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 appearance requirements: 1, hot dip galvanized guardrail connections (welding, screw connections) should be solid. Metal railings and metal, plastic or hard wood handrail connections shall comply with the design requirements and existing standards specifications. 2, the surface should be smooth galvanized fence hot dip galvanized fence sales, there should be no burrs, welding slag and obvious hammer marks and other cosmetic defects. Described above is the appearance of hot dip galvanized guardrail fence manufacturers require galvanized spray, I hope you understand galvanized guardrail heat: Because the wall thickness of the casting 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 generally 500 ~ 550 ℃ holding time of 2 ~ 8h, and then furnace cooling, this process eliminates the use of 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, 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 thermal insulation effect of galvanizing spray fence, swim and high cementite eutectic cementite decomposition of graphite, in the subsequent cooling process protection and secondary cementite eutectoid cementite decomposition also occurred graphitization process. Due to the decomposition of cementite, resulting in decrease in hardness, thereby improving the machinability.