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See Chinese contents: QC/T 262-1999 QC/T 262-1999: Metallographic Test of Car Carburizing Gear
This Standard specifies the definitions and test methods of metallographic structure, effective layer depth of carburized case for the car steel carburizing gear. This Standard is applicable to the car gear with effective depth of carburized and hardened case greater than 0.3mm. This Standard is applicable to the quality inspection of gear after finishing all the heat treatment procedures.
