17-7 PH stainless magnetic?

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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The bar of 17-9 PH I have from McMasterCarr is very magnetic. It's in the H900 state.
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wrote:

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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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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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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On Mon, 25 Feb 2008 21:36:37 -0800 (PST), with neither quill nor

So tell McMaster and have them ask their supplier to replace your cutter--at the supplier's cost.
-- Such is the irresistible nature of truth that all it asks, and all it wants, is the liberty of appearing. -- Thomas Paine
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On Mon, 25 Feb 2008 21:16:34 -0500, "Ed Huntress"

I don't have a piece, at least not one that I'd trust the ID on. But according to an Armco pamphlet I have here, 17-7 comes from the mill in either condition A or C. A is mill annealed and non-magnetic, C is heavily cold worked and magnetic. Condition C is required as a starting point for treating to Condition CH900, which is the state with highest tensile properties.
--
Ned Simmons

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wrote:

Aha! That's exactly what I need. Thanks, Ned.
-- Ed Huntress
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