Abstract
The microstructure and mechanical properties of 25MnB and 25CrMnB track shoes are studied in this paper. The results show that, after proper heat treatment, both 25MnB and 25CrMnB can meet the requirements of mechanical properties for track shoes. The addition of Cr element refines the microstructure of the steel, so that the grain-size number of the plate portion of the track shoe is refined from 8.5 to 9.5. However, it also increases the hardness, strength, and toughness of steel. The impact toughness of 25CrMnB at room temperature and at 40°C is higher by 12.1 and 27.6% than those of 25MnB, Therefore, 25CrMnB steel is preferable for track shoes applications with large sizes, poor working conditions, and high load-bearing requirements.
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