<![CDATA[Bicycle stem is the link between handlebar (handlebar) with steerer tube (fork). Stem one of the bike parts tonote and Each type of bike is different for the size and specifications stemnya. This research aims to. Obtainedcharacterization of alumunium casting material as a material for making stem bikes with casting temperature of700 ° C, and temperature variations of room temperature (30 ° C), 100 ° C, 150 ° C, 200 ° C, and characteristichardness values stem between piston waste material and stem. The piston waste is melted at the meltingfurnace at a temperature of 700 ° C. then cast into the mold. After obtaining the specimen and then testing thematerial characteristics include chemical composition, microstructure, and hardness. The result of the researchafter casting with variation of the molded temperture has different material characteristic values, ie: chemicalcomposition which has no change before and after casting, the microt structure has little porous defect, and thehardness value where the higher the mold temperature the lower the hardness . Conclusions of data processingThe highest value of piston recycled hardness is 93 HV when compared to the hardness of 61.2 HV stem bikematerial, the hardness is more than enough and from the composition test there is a difference of Si 12%composition. Result of micro structure at foundry with 4 variation still have defect of cast (porous andshrinkage). the stam bike hardness test has an average hardness value of 64.2 HV whereas for the hardnessvalue of piston waste casting results show the hardness value of 91 HV with mold temperature 30 ° C, 93 HVwith mold temperture 100 ° C, 89 HV with mold temperature 150 ° C, 87 HV with mold temperature 200 ° C. Thehigher the mold temperature, the lower the hardness of the material.]]>
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