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# Annealing 17-42

## 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.

### RE: Annealing 17-4

Austenite temperature is 1040 °C. (source: ASM Handbook volume 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

Since the forging temperature for 17-4 is 2150-2200 oF (1177-1204 oC), there must be some strength at 1904 oF (1040 oC).

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.

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