Re: Frame casting

Don:
Well I worked in the steel industry for 35 years and I never heard of "cooking" cast iron. You can anneal castings to releave stresses but the reduction of the carbon to any great extent would be somewhat of a stretch. We made enameling iron that was "cooked" in a pure hydrogen atmosphere for 16 to 24 hours and we only reduced the carbon level from about .05 to .08% and cast iron runs over 2 to 3% carbon. Also during cooling the carbon is going to migrate to the surface so you are never going to end up with .30% or less which would qualify as a high carbon steel.
The frames look to me like they were flame cut from steel plate and then machined. They may be "cooked" (annealed) after that to stress releive them.
Enough of my ignorance on the subject. There may be a process as you described but am doubtful.
By the way I don't seem to be able to get into the archives except for the first 30 days or so. What am I doing wrong?
Thanks for a great web site. I enjoy the comments and information.
Frank