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Posted by Ed Huntress on February 25, 2008, 9:16 pm
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I'm having trouble finding out about the mill-supplied condition of 17-7 PH
stainless. The issue is a complicated one but it could be answered if anyone
has a piece of 17-7 PH stock and a magnet. If so, is it magnetic?
It can go either way; it depends on whether the stainless was left in the
mill-rolled condition before heat treatment. 17-7 PH is a "semi-austenitic"
grade that becomes martensitic (and thus magnetic) when it's cold-worked. If
it's magnetic, it was mill-rolled or otherwise cold-work and then solution
treated. If it's not, it was annealed in between those two steps.
Thanks, if anyone has a piece of the material and can see if a magnet sticks
to it.
--
Ed Huntress
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Posted by oldjag on February 25, 2008, 10:15 pm
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> I'm having trouble finding out about the mill-supplied condition of 17-7 PH
> stainless. The issue is a complicated one but it could be answered if anyone
> has a piece of 17-7 PH stock and a magnet. If so, is it magnetic?
>
> It can go either way; it depends on whether the stainless was left in the
> mill-rolled condition before heat treatment. 17-7 PH is a "semi-austenitic"
> grade that becomes martensitic (and thus magnetic) when it's cold-worked. If
> it's magnetic, it was mill-rolled or otherwise cold-work and then solution
> treated. If it's not, it was annealed in between those two steps.
>
> Thanks, if anyone has a piece of the material and can see if a magnet sticks
> to it.
>
> --
> Ed Huntress
The bar of 17-9 PH I have from McMasterCarr is very magnetic. It's in
the H900 state.
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Posted by Ed Huntress on February 25, 2008, 10:28 pm
Please log in for more thread options
>> I'm having trouble finding out about the mill-supplied condition of 17-7
>> PH
>> stainless. The issue is a complicated one but it could be answered if
>> anyone
>> has a piece of 17-7 PH stock and a magnet. If so, is it magnetic?
>>
>> It can go either way; it depends on whether the stainless was left in the
>> mill-rolled condition before heat treatment. 17-7 PH is a
>> "semi-austenitic"
>> grade that becomes martensitic (and thus magnetic) when it's cold-worked.
>> If
>> it's magnetic, it was mill-rolled or otherwise cold-work and then
>> solution
>> treated. If it's not, it was annealed in between those two steps.
>>
>> Thanks, if anyone has a piece of the material and can see if a magnet
>> sticks
>> to it.
>>
>> --
>> Ed Huntress
>
> The bar of 17-9 PH I have from McMasterCarr is very magnetic. It's in
> the H900 state.
Hookay. Do you order this stuff regularly? If so, do you specify the H900
condition, or does it just come that way if you order 17-9 PH with no other
specification?
That's what I'm trying to find out. I'll try to find a good supplier when I
get to it and ask, but somebody's asking me what the "normal" condition of
the stuff is, as it's delivered by the mill, if you just specify 17-7 PH. I
haven't handled the stuff for over 20 years and I don't know.
Thanks for that info, though, regardless.
--
Ed Huntress
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Posted by oldjag on February 25, 2008, 11:40 pm
Please log in for more thread options I wanted the H900 condition as it being used for a tool to cut mild
steel bolts, screws etc. underwater. McMaster seems to have it in
most flavors, probably at a bit higher price than if you purchased
from a steel supplier in quantity.
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Posted by Mechanical Magic on February 26, 2008, 12:36 am
Please log in for more thread options > I wanted the H900 condition as it being used for a tool to cut mild
> steel bolts, screws etc. underwater. McMaster seems to have it in
> most flavors, probably at a bit higher price than if you purchased
> from a steel supplier in quantity.
McMaster gets some clinkers.
I ordered some 4140 bar stock, supposedly annealed. Machined rather
poorly. Made the part, delivered to the happy customer. It was a one
off gib that had been lost on a BP size mil (KO)l. I was in a hurry.
Well it finally bugged me to the point of measuring the hardness.
IIRC it was ~20Rc, not quite pre-hard, but much harder than annealed.
McMaster can't measure every incoming part, so I don't blame them, but
shit happens.
DJ
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> stainless. The issue is a complicated one but it could be answered if anyone
> has a piece of 17-7 PH stock and a magnet. If so, is it magnetic?
>
> It can go either way; it depends on whether the stainless was left in the
> mill-rolled condition before heat treatment. 17-7 PH is a "semi-austenitic"
> grade that becomes martensitic (and thus magnetic) when it's cold-worked. If
> it's magnetic, it was mill-rolled or otherwise cold-work and then solution
> treated. If it's not, it was annealed in between those two steps.
>
> Thanks, if anyone has a piece of the material and can see if a magnet sticks
> to it.
>
> --
> Ed Huntress