Chuck, I would agree with that thinking, although the cyanide colors from Heinzelman stayed quite consistent over the years which would indicate the alloy mix stayed pretty much the same for a long time........if anyone here wants a complete analysis, they should forward a sample of their steel to Kachina Metal Testing Laboratories in Phoenix.

Kachina will conclusively analyze the steel for anyone that wants to know, in as much detail as you are willing to pay for......their primary business is aircraft steel and alloys. Kachina is an established metal laboratory with years of experience and all the latest equipment.

I have used them many times over the years and the results were outstanding.

Doug