17-4 H1150 and H1075
17-4 H1150 and H1075
(OP)
I have specified round pins be made of 17-4 H1150 double-aged. I want to freeze these pins prior to insertion into bores. My first question, any metallurgical change that can occur during freezing step that should cause me concern?
Second question. My supplier, in their infinite wisdom, supplied me condition H1075 because it's "equal or better in strength and therefore meets my requirements". While I work with my purchasing team to unravel this debacle, same metallurgical question as above but for condition H1075.
Thank you for your time.
Second question. My supplier, in their infinite wisdom, supplied me condition H1075 because it's "equal or better in strength and therefore meets my requirements". While I work with my purchasing team to unravel this debacle, same metallurgical question as above but for condition H1075.
Thank you for your time.





RE: 17-4 H1150 and H1075
You are talking about double H1150 and not overaged to H1150M, right?
As long as they are making the higher elongation and impact toughness then they should work, but....
If this was mine I would demand to have the parts reaged at the correct tmep.
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P.E. Metallurgy, Plymouth Tube
RE: 17-4 H1150 and H1075
Sounds like you need a new supplier
RE: 17-4 H1150 and H1075
RE: 17-4 H1150 and H1075
I do not foresee any undesirable metallurgical consequences after freezing, although the impact strength will decrease while tensile increases in both conditions.
RE: 17-4 H1150 and H1075
RE: 17-4 H1150 and H1075
Make sure that he understands that he will be doing this no charge, and that you want the furnace charts.
I have asked guys to send me a photo of them holding the part before the second age cycle, then you know that they actually cooled it.
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P.E. Metallurgy, Plymouth Tube