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ASTM B148

ASTM B148

(OP)
I believe the requirement of the above standard is that iron content shall not exceed the nickel content, what i ask is, if for some reason the iron content did exceed the nickel what would the implications be for material performance in terms of corrosion resistance, for example.

Does this question make sense? Sorry humble draughstman here but may have issue with some castings recently produced.

RE: ASTM B148

Which alloy? The spec covers about a dozen.
How was it annealed? Have you looked at the microstructure?
Is the material fully non-ferromagnetic?

If you have Fe rich phases in the grain boundaries then you will have reduced corrosion resistance. However many NAB alloys have higher Fe levels and work just fine.

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Plymouth Tube

RE: ASTM B148

(OP)
Sorry ASTM B148 C95800. No haven't looked at microstructure, as the castings are out in the field at the moment. What we have under the chemical requirements of C95800

Iron - should be 3.5 to 4.5, actual 4.1
Nickel -m should be 4.0 to 5.0, actual 4.0

RE: ASTM B148

If they were annealed properly and don't have any magnetic phases in the grain boundaries I don't see any problems.

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Plymouth Tube

RE: ASTM B148

(OP)
Edstainless - many thanks for your input appreciated.

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