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See Chinese contents: GB/T 37559-2019 GB/T 37559-2019: Normalizing and annealing of heavy steel forgings
This Standard specifies the requirements and methods for normalizing and annealing of heavy steel forgings, including pending workpiece, heat treatment equipment, heat treatment processes, heat treatment quality and inspection, calibration, safety and health requirements, energy consumption requirements, and product reports. This Standard is applicable to normalizing and annealing of heavy steel forgings for heavy equipment that is used in industries such as energy, metallurgy and transportation.
