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1.25 Ni-1.0Cr-0.1Mo case hardenable steel of EN353 grade is used for manufacturing gears. One such gear assembly was used in the azimuth control gearbox of an antenna system. After about six months in operation, the gear failed with a big noise in the gearbox during operation. The gearbox when opened showed disintegrated teeth of both gear and pinion, which was found, crushed and resulted in multiple smaller pieces. Globular shaped metallic pieces were also found in the gearbox.

Embrittlement of 1.25 Ni-Cr Case Hardenable Steel Used for Gear Assembly