From the experiments, there may be some errors that occur in the time trial. Due to several reasons, such as the time it takes to Heat Treatment does not meet the time limit is 30 minutes, but we Heat, such as Heat and temperature of 35 or 40 minutes is another factor of the cause of the error, which we are not equal to the temperature can be set to 170C at any time because it works automatically and hardness measurement error may be caused by the trial user do not have expertise in the use of hand tools and life that much.
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