<![CDATA[In the industrial world has many complex problems about metals, therefore there needs to be a variety of heat treatment on metals in order to obtain the desired product. Therefore, in this study was conducted to obtain data on the effect of heat treatment on the hardness value and micro structure of Amutit steel and the influence of hardening process with three types of enhancing media namely carbon powder, anthracite, and wood charcoal with four variations of cooling media namely Ordinary Water, Sea Water, Ice Water and Oil. With this research is also expected to be useful in the manufacturing industry. The purpose of the study was to obtain optimum hardness due to the process of heat treatment and rapid cooling. Steel material amutit K-460 / AISI 01 is included in the classification of steel tools used in the manufacturing industry to help the production process such as cutting tools and as a mold material for plastic materials. Based on the results of the research that has been done, it can be concluded that Baja amutit or AISI 01 has a hardness of 16.3 HRC without treatment. The hardness of this amutit steel is able to be increased through heat treatment with rapid cooling. Heat treatment done with the addition of activated carbon media is harder in comparison with the addition of Anthracite media and wood charcoal media. The highest hardness is influenced by the form or dimension of activated carbon that is smoother than other media, where the smoother or smaller the dimensions of the enhancer material, the faster the diffusion process occurs. Where the average hardness for the addition of activated carbon media is Sea Water (64.13), Plain Water (63.46), Oil (63.83), and Ice Water (66.2) with HRC units, As for anthracite media, namely Sea Water (58.26), Plain Water (54.76), Oil (51.8), and Ice Water (55.8) with units of HRC and Wood Charcoal media of Sea Water (58.33), Plain Water (51.83), Oil (45.8), and Ice Water (58.8) with units of HRC.]]>
