How to make the lathe chuck spanner? (steel hardening and tempering)
Wrenches need a certain degree of hardness, but also a certain degree of toughness, 45 steel is of high quality carbon steel, it should be said that the general wrench is acceptable.
You take the professional heat treatment plant heat treatment, ah, and not much money (HRC30-40) on it.Bending may also be the wrench you designed. The torque arm is too long and thin
You say the problem should be the problem of quenching, do not do the whole quenching, hardness will be crisp.Adjustable material (HRC28-32) can be considered, and Zn is plated on the surface after processing.
