The low heat conduction values and high mechanical properties of stainless steels, which have high resistance to corrosion, make them difficult to be machined. Custom 450, a martensitic stainless steel alloy, is highly resistant to corrosion especially at high temperatures and is used in ammunition coolant tanks. Although there are studies on the machinability of stainless steel alloys in the literature, studies on the drillability of Custom 450 martensitic stainless steel are quite limited. For this reason, Custom 450 material was subjected to drilling experiments in the study with 4 different cutting speeds and 4 different feed rates using 4 different carbide drill bits without using coolant. In order to model and minimize the thrust force, drill bit temperature and burr height values, experiments and measurements were carried out using the L16 orthogonal arrays of Taguchi method. Drilling variables were optimized simultaneously by applying Taguchi-based Grey Relational Analysis (GRA) with the help of the data obtained from the experiments. Mathematical models have been developed by using the Response Surface Method (RSM) in order to predict the experimental results. It was observed that there was a significant increase in the thrust forces and burr heights with increasing values of the feed rate. The drill bit temperature was adversely affected by the increasing values of cutting speed. According to the analysis of variance, it was seen that the most effective control factors were 86.30% feed rate for thrust force, 97.52% cutting speed for temperature and 85.87% for burr height. Following the GRA, the feed rate was found to be the most important control factor with a value of 0.2921. Moreover, according to the results of multiple response optimizations, the most suitable parameters were identified as 15 m/min. Cutting speed, 0.005 mm/rev feed rate, and the drill bit number 4. The reliability of the developed mathematical model was confirmed with determination coefficients which are 98.34% for thrust forces, 99.78% for drill bit temperature and 98.54% for burr height.

不锈钢的低热传导值和高机械性能，具有高耐腐蚀性，使其难以加工。Custom 450 是一种马氏体不锈钢合金，具有很强的耐腐蚀性，尤其是在高温下，用于弹药冷却液罐。虽然文献中对不锈钢合金的切削加工性进行了研究，但对Custom 450马氏体不锈钢的切削加工性的研究相当有限。出于这个原因，Custom 450 材料在研究中使用 4 种不同的硬质合金钻头进行了 4 种不同切削速度和 4 种不同进给率的钻孔实验，而不使用冷却液。为了模拟和最小化推力、钻头温度和毛刺高度值，使用田口法的 L16 正交阵列进行实验和测量。借助从实验中获得的数据，应用基于田口的灰色关联分析 (GRA)，同时优化了钻井变量。为了预测实验结果，已经通过使用响应面方法 (RSM) 开发了数学模型。据观察，随着进给速率值的增加，推力和毛刺高度显着增加。钻头温度受到切削速度增加值的不利影响。根据方差分析，最有效的控制因素是推力进给率86.30%、温度97.52%的切削速度和毛刺高度85.87%。在 GRA 之后，发现进料速率是最重要的控制因素，其值为 0.2921。此外，根据多响应优化的结果，确定最合适的参数为 15 m/min。切削速度、0.005 mm/rev 进给率和钻头数量 4。所开发的数学模型的可靠性通过推力的 98.34%、钻头温度的 99.78% 和毛刺高度的 98.54% 的确定系数得到证实。