Heating 17-7Ph a little, how much softer?
Heating 17-7Ph a little, how much softer?
(OP)
I have some 17-7Ph stainless steel that is in the CH condition. So its been cold rolled and then had 1 hour at 480 degrees C. Now I need to heat it again for 1 hour at 120 degrees C. So how much softer will it get? I mean will i lose 1% or 10%? on the yield strength. What would you think? Regards, Ant.





RE: Heating 17-7Ph a little, how much softer?
http://www.aksteel.com/pdf/markets_products/stainl...
Review table 5 which is elevated temperature tensile properties to determine the effects of exposure temperature at 120 deg C.
So, I see two options - the first is to assume if you took CH900 and exposed it to 120 deg C you can determine how much the UTS and TS could drop at that temperature, and use the % drop as worst case scenario.
OR second option, I would expect even less of a change in the CH900 properties from option 1 above because the exposure temperature (up to 120 deg C and back down to RT) is too low to cause any appreciable changes. To prove this option, run a coupon of the CH900, expose it to the second temperature, cool and test for UTS, RA and elongation. This is the only way to know for sure.
RE: Heating 17-7Ph a little, how much softer?
should be condition
TS should be YS
RE: Heating 17-7Ph a little, how much softer?
Point of interest:
There is a phenomena that does manifest itself after about 100 thermal cycles and that is we start getting an increase
in hardness with some loss of elongation. We have seen a rise in from hardness from 40 Rc to around 48 Rc over time. We will normally overage them at this point.
RE: Heating 17-7Ph a little, how much softer?
RE: Heating 17-7Ph a little, how much softer?
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Plymouth Tube
RE: Heating 17-7Ph a little, how much softer?