0.13 % carbon,
Heat treating characteristics:
none - hey it's a mild steel!
bright color under etching (due to the nickel)
This steel is typically used in nuclear containment vessels
in which the high nickel content confers better resistance to radiation
decomposition (compared to mild steel). I purchased a large quantity from a
company in Texas in the form of 36" x 2" x 1/4" strips (torch cut). Since I try
to maintain a high carbon content in the billets, I use this material sparingly.
I typically hammer it down to ~1/16..1/8" thick and include a single piece in
the mix. As a result, I don't expect that I will ever run out of 203E.