heat treating 17-4 ph

[brents]

Hello,

Does anyone know the tempering temperature to heat treat 17-4 ph stainless to 50+ Rc?

I know this is really hard, but water is going through it at about 15,000 psi..

any help would be appreciated,

thanks,
brent

 

[swall]

Rc 50 is in excess of the normal hardness attainable for
17-4.

 

[israelkk]

Pressure containing systems should be designed based on tensile and yield strength and not for hardness.

 

[EdStainless]

http://www.alleghenytechnologies.com/ludlum/Documents/17-4Cdate082206.pdf

Check it out, the mid-40's are about all that you can expect.

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Plymouth Tube

 

[PetieSmo]

brents,

I agree with israelkk: You should not be designing for hardness in a pressurized system. However, I would guess that you are using a conversion chart & desire to have a tensile strength around 250 ksi, based on your desired Rc50. If so, you won't get there with 17-4 PH (according to Mil-Hdbk-5). H900 Condition is 170ksi yield, 190ksi ultimate.

PH13-8Mo will get you a little higher; "Custom 465 Stainless" will go even higher. Need to look at the whole picture, though - ductility might be a different requirement.

Pete

 

[EdStainless]

Custom 465 is nice stuff, if you can find it, and if you can figure out how to connect to it.

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Plymouth Tube

 

[TemperedMartensite]

You may want to look at ATI S240 - it can get you well over 200ksi min yield (approaching 230ksi). It works the same as 17-4 - it just has more strength. It is produced in bar products by ATI Allvac.