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The main requirement for steel material to be increased in hardness through the heat treatment process is the level of carbon content must be ≥ 0.3%. Steel material with a content of ≤ 0.3% must be increased in carbon content to ≥ 0.3% if it is to be hardened through a heat treatment process. The process of increasing carbon content in steel is known as a pack carburising process which is generally carried out without pressure. inthis method, the process of adding carbon content by heating soft steel specimens in containers containing 1000 mesh of carbon powder under pressure from two axial directions so that the distribution of carbon powder pressure is more evenly distributed than when pressure is only applied from one direction only. With this method, it is expected that the carbon gas diffusion and penetration of carbon atoms into the surface of the specimen will be deeper. The amount of pressure applied is 1 MPA, 2 MPa, and 3 MPa at temperatures of 800ºC, 900ºC and 1000ºC with the holding time of each process being 2 hours and 3 hours. The highest increase in carbon content was obtained from a process temperature of 1000 ºC with a biaxial pressure of 2 MPa and a holding time of 3 hours, amounting to 0.41% C. The greatest tensile strength is 823.6 N/mm2 obtained from a carburizing temperature of 900 ºC with a holding time of 2 hours and a biaxial pressure of 1 MPa. While the highest surface hardness achieved after the specimens were hardened at 900 ° C was 115.4 HRB obtained from a carburizing temperature of 1000 ºC with a holding time of 3 hours and a biaxial pressure of 1 MPa. The outputs of this research are Appropriate Technology in the field of adding carbon content to low carbon steel and modifying the mechanical properties of low carbon steel.