yes, sorry i did mean work harening! but like you say, ThomasPowers, this is the wrong road.
The hammer is actually an old lump hammer which i have reshaped, so difficult to give exact details of steel.
Before tempering, the whole head was heated to a cherry red then after quenching face and peen I Polished a spot on face and peen edge and at desired colour quenched whole head . Am i being impatient ? should repeat this process until i get desired result ?