Are percussion hammers case hardened?

[enfield2band]

Hi,
Are the hammers on a percussion shotgun or rifle case hardened, or, are they tempered after they have been formed?

Thanks.

[greenshoots]

or, are they tempered after they have been formed?

i stand to be corrected but i say made of mild steel first and tempered after,
some very intricate designs on some hammers

greenshoots

[g3lcs]

I tried to bend a Parker Hale percussion hammer to a better shape to strike the nipple more centrally and it broke!! I think they are case hardened cast steel but I may be wrong.
Gogs