Sorry, hit the wrong button. I don't know about 4130 specifically.
However, when I worked in a metal fabrication shop, normalizing and
annealing were similar, but not the same. Annealing was when the steel was
heated to above the critical point and VERY SLOWLY cooled. That means that
it was wrapped in insulation or buried in hot ashes, or anything to increase
the cooling time. A minimum of 2 hours and as much as 12 hours were spent
on cooling.

Normalizing was heating the steel to above the critical point, but letting
it air-cool in still air. This would mean a cooling time of 15 minutes to
45 minutes. In no case was the hot steel dipped in oil or anything else (as
was mentioned in an earlier post). That is quenching, a completely
different process.

In other words, normalizing is careless (or incomplete) annealing. It is
soft, but not as soft as annealed steel. It is ductile, but not as ductile
as annealed steel. It has more internal stresses than annealed steel.
However, it is MUCH quicker, which is important in manufacturing.

"Harry O" wrote in message
...
I don't know about
"Stealth Pilot" wrote in message
...
On 04 Dec 2003 20:09:54 GMT, S (Whunicut) wrote:
I must admit to not understanding his question. In Australia
normalised and annealed mean the same thing.
Stealth Pilot