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17-4 heats -Let me count the ways

17-4 heats -Let me count the ways

17-4 heats -Let me count the ways

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For years I advised my shop not to use 17-4 at condition A for load bearing because of unpublished mechanicals.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?

RE: 17-4 heats -Let me count the ways

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.  

    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
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.

RE: 17-4 heats -Let me count the ways

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

RE: 17-4 heats -Let me count the ways

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.

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

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