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1.引言到目前为止,主要有以下两种钢用于铁路设备的金属结构: ——法国标准NFA36205的A42FP号钢; ——国际铁路联盟标准UIC843的AC52号钢。这两种钢均适合于下述专门用途: A42FP号钢主要用于承受疲劳应力的结构,转向架就是一个典型的例子。选择这种钢将获得良好的延展性和可焊性。实际上,由于这种钢的化学成份,焊前不需采取任何特殊的预防措施,而且,对冷裂也不敏感,但这种钢容易引起疲劳。
1. Introduction So far, the following two types of steels are mainly used for the metal construction of railway equipment: - A42FP steel of the French standard NFA 36205; - AC52 steel of the International Union of Railroad standards UIC843. Both of these steels are suitable for the following specialized applications: A42FP is mainly used to withstand fatigue stress structure, the bogie is a typical example. Select this steel will get good ductility and solderability. In fact, due to the chemical composition of the steel, no special precautions are required before welding and are not susceptible to cold cracking, but the steel is prone to fatigue.