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Engineers have been interested in a thorough understanding of how a case-hardened part, consisting of soft substrate (or core) and hard surface, behaves under various types of loads, ranging from extremely destructive load to mild cyclic loads. The use of numeric simulation, such as well known finite element method, has made it much easier to achieve this. Throughout this investigation, the author proposes a methodology to treat such a case-hardened part as multi-laminated metal with a relative thin outer layer whose ultimate tensile strength may be several times as high as its inside core material. In the case studies to demonstrate the technique, a representative automotive component is subject to various loads due to not only the inertia of its own but also that imparted from heavy springs housed within it. A comparison was made between two approaches to account for the hardness transition between the hard layer and soft core.