Design of Rolling Machine to Improve Mechanical Properties of Strapping-band Steel and Low Carbon Steel type SHP 440

Abstract

The modification of new roll machine should be able to produce very good mechanical and physical properties of different metal materials. Furthermore, this also can affect the microstructure of the metal. Conventional low carbon steel with a ferrite-perlite microstructure has relatively low mechanical properties. Due to it our research work refers to the mechanism of metal strengthening by means of grain refinement with the assumption that it will increase the strength and toughness of this Special High Performance (SHP) 440 low carbon steel. SHP 440 carbon steel with a maximum carbon content of 0.18% by weight C through a cold rolling process with size reduction variations of 10, 20, 30, 40, 50, 60 and 70%. The results showed that the most optimum increase in hardness values occurred in rolling with a size reduction of 70%, namely HB: 98 and increase of 16% from the initial hardness value, namely HB: 81.67 with a grain size of 8.20μm or decreased by 24.44% from the initial grain diameter of 10.85μm. In this research work it has been found that the greater the percent reduction in rolling size the hardness value of the SHP 440 low carbon steel will be higher.