jls wrote:

I have taken 4130 tube and heated it red hot then quenched it in cold
water.
It is then brittle, but mild steel will remain soft enough to bend.
That's
why when you weld 4130, you have to normalize the welds by heating
them
cherry red, then allowing them to cool gradually at room temperature
and no
drafts. You, being the nobody at nowhere of authority, correct me
if I'm
wrong here.


Earlier you wrote that ACS had substituted soft carbon steel for 4130.
Quenching high carbon steel makes it brittle and hard.

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FF