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...-change Nozzles Casting Time : Upper nozzle casting time :18-36 hours ,Max record 40 hour . Collect nozzle casting time :6-8 hours, Max record 12 hour . Topchase Nozzle zirconia content 94-95% , and nozzle with metal shell ,can protect nozzle burst. the casting temperature normally at 1520-1580 ℃....