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为了提高汽车的燃油经济性,需要进一步减轻零部件的质量。减轻运动件(例如连杆)的质量对于降低相邻运动件的质量尤为重要。采用高强度钢能减小连杆杆身横截面,从而减轻连杆的质量。然而,传统高强度钢的机加工性能很差。因此,开发了1种连杆用的新高强度钢,它以中碳微合金钢为基础,并添加了能够提高屈强比的钒元素。与传统钢相比,新开发的高强度钢的强度提高了10%。采用新高强度钢制造的连杆其质量能减轻8%。这种连杆已从2013年开始进行批量生产,应用于车用发动机。
In order to improve the fuel economy of vehicles, the quality of spare parts needs to be further reduced. Reducing the mass of moving parts, such as connecting rods, is especially important for reducing the mass of adjacent moving parts. The use of high-strength steel can reduce the rod shaft cross-section, thereby reducing the quality of the rod. However, the machinability of conventional high-strength steels is poor. Therefore, a new type of high strength steel for connecting rod has been developed which is based on medium carbon microalloyed steel and adds vanadium element capable of improving the yield ratio. Compared with traditional steel, newly developed high-strength steel increased by 10% strength. The quality of the connecting rod made of new high strength steel can be reduced by 8%. This connecting rod has been mass-produced since 2013 for use in automotive engines.