Yeah jOe... this thread is concerned with the virtual non-issue of shotgun frame composition. It is a virtual non-issue because the design of the frame probably has as much or more to do with the rare problems of cracking and stretching than the type of steel they were made of. Heat treatment or lack thereof is another variable that would have to be considered to arrive at any valid conclusions. It might be more interesting and educational to experiment with different steels to see what effect different compositions have on the outcome of case hardening colors. Lots of variables to consider in that process too.
Other than that... this subject has far less practical usefulness than threads on hinge pin lubricants.
