Material Standards

[nminehan]

Hi,

If a material is called out on a drawing say astm a240 type 304 of a deep drawn part which is annealed after forming, does the minimum material properties set by the standard still apply?

Thanks.

 

[EdStainless]

If you ref the spec then you are saying that you abide by its contents.
For any 304 annealed part you would be foolish to design using anything other than the min properties in that spec.

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P.E. Metallurgy, consulting work welcomed

 

[JStephen]

The way you have it worded, I would say "not necessarily".
That is, the drawing says to use XXX material meeting an ASTM spec and do this or that to it, and does it still meet the spec properties when you're finished?
If the spec properties are given in the annealed condition, I would expect properties after forming and annealing to be similar, but not necessarily the same.
If the spec properties are given in anything but annealed condition, I would expect more variation.

 

[SWComposites]

Agree, if you anneal after forming the properties will likely be different from the base material standard properties. But it all depends on a lot of details. You will likely need to obtain your own test data for the material in the formed + annealed condition.

 

[EdStainless]

If you want to work to other properties then you need a detailed specification that lays out properties (UTS, Yield, Elong) as well as how you want it tested (location of samples and frequency of testing).
But if the part is annealed correctly then the existing spec minimums should be applicable.

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P.E. Metallurgy, consulting work welcomed

 

[drawoh]

nminehan,

Your drawing should call up what your inspector will accept at the loading dock. If your part needs to be heat treated, specify Brinnel or Vickers hardness.

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JHG