Cracking hardness, off carburizing and quenching in existing vertical minimum conditions, Postfix meets Tri criteria results confirmed the strain, cracking, and no problem.
Results hardness, de-carburization, cracks baked is置割, it was confirmed in the distortion existing on the lower limit of the condition, it meets the criteria tri, no problem.
The upper and lower limit conditions existing in hardness, carburizing, quenching crack, crack, strain, and try to meet the criteria, there is no problem