17-4 heats -Let me count the ways 1

[ccw]

Now I see HH1150 or H1150+1150 from BearCraft. Apparently this is two times through H1150 process heat treat. BearCraft publishes a separate set of mechanicals that go with it. Also now I am seeing published mechanical properties for Condition A solution annealed state, where before Carpenter and others refused to publish condition A mechanicals. Also see that ductility for condition A can be all over the map. How about the material community bringing some order to this chaos?

For years I advised my shop not to use 17-4 at condition A for load bearing because of unpublished mechanicals. Now I am having second thoughts. What is the consensus of this august body?

 

[unclesyd]

Based on many many years of using 17/4 for mechanical components and many many discussions with the ARMCO and Carpenter technical people in my opinion you are correct in not using 17/4 in Cond. A.
[ul]
H900 Only for thrust or compression applications
H1050 Highest strength level in tension due SCC
H1100 Some shafts and pressure containing components
H1150 x 2 The toughest applications
H1150-M Recover property values due to inservice hardening
[/ul]

We used several other treatments due to forming considerations.
I have never seen consistent physicals from 17/4 no matter the source. We got by just looking at a the minimum valves in the area of interest. We were able to do this as we were an industrial arena and normally weight and size weren’t a factor.

 

[israelkk]

Just to add. it is easier to machine in the heat treated condition than the A condition.

 

[EdStainless]

It is easier to cold work it in the over aged condition than in 'A' also. We anneal, over age, cold work, reanneal, and final age.
Allegheny Ludlum publishes 'A' values, but I wouldn't use the material in that condition.
If you want it soft use the 1400/1150 over aging.

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Corrosion, every where, all the time.
Manage it or it will manage you.

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