what is the hardness of 4140 & 1045 what is the hardness of 4140 & 1045?It demand on which condition. what is the hardness of 4140 & 1045 by Q+T?It should be 28~32HRC what is the hardness of 4140 by anneal condition?It should be≤ 22HRC what is the hardness of 4140