The load size and direction of the rear axle of the vehicle are constantly changing in the driving process, and its failure is mainly manifested in the fatigue fracture of some parts. Therefore, the materials used must have certain fatigue strength. The rear axle body designed for this purpose is made of 45 steel. According to gb8162-87, the hot-rolled seamless steel tube 108 × 25 with a weight of 56.47kg is selected as 40Cr, and its main mechanical properties are as follows:<br>
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