Metal steel making currently embodies the trend of customization and batch production resulting in difficulties of cost control. This study integrates RFID monitoring systems with fuzzy multiple objective linear programming (FMOLP) method to formulate a manufacturing decision model with cost minimization for steel making procedures. Operations data collected from manufacturing procedures were accordingly transferred into the model and therefore manufacturing decisions can be made. Cost factors considered in the model were materials, outsourcing, manufacturing, and manpower. To make the model more applicable, costs related to rework and overtime were also included. In consideration of energy consumption, the proposed model was formulated as minimizing two objectives of total cost and energy use. The applicability of the RFID monitoring systems with the proposed model is assessed by using the anchor manufacturing in a yacht metal steel plant. The RFID devices were practically installed in each work station for collecting manufacturing data and connecting to the proposed model. Various designed scenarios are analyzed to identify the manufacturing options for metal steel making in a yacht manufacturing factory. The analytical results in this study can help decision makers to systematically analyze the cost effectiveness of metal steel making during capacity planning in practical application.