The result of the experiment found that the hardness of hardened S45C steel before the average equal to 21.10 HRC after hardening by quenching oils without changing the oil, start by first plating hardness increase equal to the HRC, and the 30th 31.16 when times are reduced and hardness equal to 28.00 HRC, click.Analyzing chemical composition of steels S45C carbon steel that is found in reduced 0.15113% wt due to loss of carbon steel. When the iron is heated in atmospheric oxidation or formal, which are carbon dioxide, oxygen, and water vapor is, check the viscosity of the oil is hardened, hardened through the process before, during and after the 3 tanks found that oil before plating viscosity equal to 1 mPa, •s 3.678 a telphone.Nuet increased 4.01 mPa •s, tank 2 viscosity increase to 3 mPa and tanks 4.08 •s viscosity increase to 4.06 mPa •s and find the confidence to experiment at 95% found that the value is equal to-11.82, which is less than the critical values is-2.048 decided to reject the.Strength of S45C steel less than the significance level 0.05 31.16 HRC will be able to see that when oil hardened heat treated sintered repeatedly at high temperatures. Hardened oil will react with oxygen in the air to make oil. The viscosity values are increased. Have the heat slowly. Impact penetrates into the meat, iron. Make the cooling rate of iron, steel hardness decrease.
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