17Cr for high temperature valve stem

[benzy4]

Hallo everybody!

I know that a lot of valves manufactures use for high pressure sevice the 17Cr material for the valve stem (as alternative to 13Cr / F6).

As 17Cr i know only the 1.4122, but i don't find any ASME/ASTM equivalence.

What ASTM material can I use for this scope????
I need a stem material that I can use for a valve with the range of F91.

Many thanks!

 

[JLSeagull]

Look at ASTM A 564 for S17400. Table 1 reflects chromium between 15 and 17.5. My assumption is that S17400 is the UNS listing for 17-4 PH material. Others can straighten me out if this is not correct.

 

[JLSeagull]

See ASME 2277. Also see ASME 2223-3 for A 705 forging and A 693 plate. ASME 2521 applies to A 564 as bolting material. I have not reviewed any of these standards.

 

[benzy4]

OK, Thanks

S17400 is not the right material for high temperature service.
Work Temperatures after 400°C is cause of spinodal decomposition of the martensite phase.

Anybody know the yeld stress og Grade 616 at temperature (400°-600°C)????
Maybe this material can be correct, but I don't find the usual data of the ASME STRESS TABLEs.

 

[JLSeagull]

Temperatures above 450 degree C eliminate many options. Is the maximum temperature 600 degree C?

 

[benzy4]

Basically, the theoretic material temperature range is the range of A182 F91 ASME VIII, the max allowable temperature for this standard is 1200°F (650°C).

But 600°C is ok for me too.

Thanks

 

[reverman]

how about A182 F316H