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Microstructure and Mechanical Properties of Gear Steels The average prior austenite grain sizes are 19.5 and 34. 2 m for the steels 20CrMnTiNb and 20CrMn, respectively. In addition, the mechanical properties of 20CrMnTiNb steel are superior to those of 20CrMn steel. In particular, the HV hardness of the former is higher than that of the later by about 4070 in the range of less than 0. 7 mm in
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