Annealing 17-4
Annealing 17-4
(OP)
Does anyone have information on the yield strength of 17-4PH SST at it's annealing temp? An educated guess?
I'm annealing parts that have a large center mass supported by thin beams. I'm trying to ensure that they don't sag during heat treat.
I'm annealing parts that have a large center mass supported by thin beams. I'm trying to ensure that they don't sag during heat treat.





RE: Annealing 17-4
Estimated yield strength: approximately 100 MPa (source: ASM Handbook volume 1 data for 304 and A-286 alloys).
Regards,
Cory
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RE: Annealing 17-4
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RE: Annealing 17-4
I found only 2 relevant data points, for H1150 condition material exposed for 30 seconds at 1800 & 2000 oF, with YS = 26.0 & 12.7 ksi, respectively. Presuming thermally activated softening, plotting log YS vs. 1/T gives
log YS (ksi) = -1.6328 + 3825/T (K)
At 1904 oF (1040 oC), this gives YS = 19 ksi (130 MPa). This is only an upper limit ~valid for 30 second exposures of H1150 condition, as microstructural changes would occur.