Implementation of Value Engineering in Heat Treatment Process to Cooling Media Steel ST 41 at PT. XY

Abstract

Value engineering analyzes the value and function for optimal results and the condition of the steel material remains consistent according to its quality function. ST 41 steel is a steel classified as low carbon steel with an alloy composition of 0.37-0.43%C, 0.5-0.35%Si, 0.60-0.90%Mn. Heat treatment in this study uses temperatures up to 7230C with temperature holding for one hour, while the proposed alternative cooling media used are salt water, coconut oil, and oil using the holding time of each cooling medium, namely 5 minutes, 10 minutes to 15 minutes. Cooling using 3 media simultaneously is very ineffective and very expensive. The right solution to eliminate unnecessary costs, this research proposes salt water media as a good medium for performance and relatively low cost compared to other media tested. The analysis that occurs from the calculation of the value engineering cost is IDR 45,500,000.00 the heating process in 1 month produces 5000 specimens per day, which can save costs of IDR 15,750,000.00. Thus, the brine medium is able to provide criteria for the speed of the cooling process properly and provide good quality results for a continuous process.