Just how much strength is lost when heat is used to straighten something? I
know it varies with the amount of heat applied, and over what area, but is
there any general statements that hold true across the board?

Steve

On Thu, 2 Feb 2012 12:12:35 -0800, "Steve B" wrote:

Just how much strength is lost when heat is used to straighten something? I
know it varies with the amount of heat applied, and over what area, but is
there any general statements that hold true across the board?

Steve

No. None. Nada.

Except one: If it melts in your lap, it's lost all its strength.

--
Ed Huntress

"Steve B" wrote in message
Just how much strength is lost when heat is used
to straighten something? I know it varies with
the amount of heat applied, and over what area,
but is (are) there any general statements that
hold true across the board?

Steve

General? Yah, don't touch it, it's hot!
And you don't know more? You're the 'expert'
around here ya know...... ;)}

On 02/02/2012 21:03, Ed Huntress wrote:
On Thu, 2 Feb 2012 12:12:35 -0800, "Steve wrote:

Just how much strength is lost when heat is used to straighten something? I
know it varies with the amount of heat applied, and over what area, but is
there any general statements that hold true across the board?

Steve

No. None. Nada.

Except one: If it melts in your lap, it's lost all its strength.


If it's basic mild steel then it won't actually lose strength when it
has cooled (unless it was work hardened, but then annealing at a
suitably high temperature will reduce the strength but restore the
ductility).

Carbon steels, now that's a different story, as Ed says.

"Steve B" wrote in message
.. .
Just how much strength is lost when heat is used to straighten something?
I know it varies with the amount of heat applied, and over what area, but
is there any general statements that hold true across the board?

Steve

In general it goes from the previous heat treated state, whatever that is,
to the annealed state, whatever that is. Know what I mean??

jsw

"Steve B" wrote in message
.. .
Just how much strength is lost when heat is used to straighten something?
I know it varies with the amount of heat applied, and over what area, but
is there any general statements that hold true across the board?

Steve




If you're talking tool steel, with enough heat you will anneal it. What do
YOU define as "strength"...tensile, compressive, shear???

On 2/2/2012 4:42 PM, Tom Gardner wrote:
"Steve wrote in message
.. .
Just how much strength is lost when heat is used to straighten something?
I know it varies with the amount of heat applied, and over what area, but
is there any general statements that hold true across the board?

Steve




If you're talking tool steel, with enough heat you will anneal it. What do
YOU define as "strength"...tensile, compressive, shear???




On a slightly more exotic metal...

I recall Kelly Johnson saying that the service life of the Blackbirds
(YF12 / SR71) should be about infinite.

They annealed themselves every flight!

"Phil Kangas" wrote in message
...

"Steve B" wrote in message
Just how much strength is lost when heat is used to straighten something?
I know it varies with the amount of heat applied, and over what area, but
is (are) there any general statements that hold true across the board?

Steve

General? Yah, don't touch it, it's hot!
And you don't know more? You're the 'expert'
around here ya know...... ;)}

Just looking to learn, Phil. Unlike some people, who already know
everything. You're turning into an irritating stalker, my friend.

You are formally hereby dismissed.

Steve

On Thu, 2 Feb 2012 21:48:40 -0800, "Steve B" wrote:


"Phil Kangas" wrote in message
...

"Steve B" wrote in message
Just how much strength is lost when heat is used to straighten something?
I know it varies with the amount of heat applied, and over what area, but
is (are) there any general statements that hold true across the board?

Steve

General? Yah, don't touch it, it's hot!
And you don't know more? You're the 'expert'
around here ya know...... ;)}

Just looking to learn, Phil. Unlike some people, who already know
everything. You're turning into an irritating stalker, my friend.

You are formally hereby dismissed.

Steve


Steve, the answer to your question -- whether or not there's some
generalization that you can apply -- is an unequivocal "no." If you
have something you've straightened with the help of heat, and if you
describe the material, how you heated it, and how you cooled it, we
can make an educated guess about what the result is.

It can vary all over the map. If it was hot-rolled 1018 steel or basic
structural steel, such as A36, chances are it had little or no effect.
Cold-rolled, it depends, but you weakened it somewhat. Other steel, it
depends more. Music wire or 1070 heat-treated, you've probably reduced
strength by 60% or even more.

The same is true for aluminum. You may even have made it stronger.
Brass, copper, etc., yield different answers. Chocolate bars, look in
your lap. d8-)

But, again, the answer is that there is no generalization that
applies.

--
Ed Huntress

"Steve B" wrote in message
. ..

"Phil Kangas" wrote in
message ...

"Steve B" wrote in message
Just how much strength is lost when heat is
used to straighten something? I know it varies
with the amount of heat applied, and over what
area, but is (are) there any general
statements that hold true across the board?

Steve

General? Yah, don't touch it, it's hot!
And you don't know more? You're the 'expert'
around here ya know...... ;)}

Just looking to learn, Phil. Unlike some
people, who already know everything. You're
turning into an irritating stalker, my friend.

You are formally hereby dismissed.

Steve

Thank You..... ;)}