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Casting equal to P92 pipe or F92 forgings
2

Casting equal to P92 pipe or F92 forgings

Casting equal to P92 pipe or F92 forgings

(OP)
Does anyone know of a casting material specification which is equal to P92 pipe or the ASTM A-182 F92 forging specification?
Thanks for your help in advance.
Peaseman
 

RE: Casting equal to P92 pipe or F92 forgings

2
The P92/T92 and F92 specifications of grade 92, which is an alloy that is a modified version of grade 91 (except the Mo was reduced from 1% to 0.5% and in its place was added 2%W,with minor amounts of V and Nb) were accepted by ASME B&PV Code as a Code case. The P92/T92 alloy was developed by Nippon steel (NF616). Based on this information, I do not believe that there is a comparable casting specification thru ASTM or ASME at this time.

RE: Casting equal to P92 pipe or F92 forgings

(OP)
metengr,
Thanks for the info. Could you please provide me with the Code Case number?
Thanks

RE: Casting equal to P92 pipe or F92 forgings

peaseman;
Sure, the ASME Code case number is 2179-3, with an expiration date of 10-2-05. The code case applies to seamless 9Cr-2W tubes, piping and forgings. Supplied as normalized and tempered or quenched and tempered with a maximum hardness of 250 BHN.

RE: Casting equal to P92 pipe or F92 forgings

metengr;
I guess that the code case you mentioned lists the max allowable stress values, if so could you give me the values at 575°C and room temp.

Thanks

RE: Casting equal to P92 pipe or F92 forgings

In addition to the info from Meteng, there is some concern with room temp ductility for P92, and this would be worsened for a cast form.

From P J Ennis "creep strengthening mechanisms in 9-12% chromium steels" 2004,regarding P92 after exposure to service temps above 600C,  "Although not seeming to have a detrimental effect on creep rupture strength  ( indeed W additions are beneficial for the long term strength) the rather large Laves phase particles are responsible for a loss of room temperature ductility and impact strength"

RE: Casting equal to P92 pipe or F92 forgings

Here is the info you requested;

Allowable stress @ RT
25.7 Ksi, tube/pipe and forgings

@1050 deg F (566 deg C)
17.2 Ksi, tube/pipe  and 16.6 Ksi for forgings

@1100 deg F (593 deg C)
13.6 Ksi, tube/pipe and 13.0 Ksi for forgings

For your specific temperature you can interpolate the value.

RE: Casting equal to P92 pipe or F92 forgings

Be aware, that if this is for ASME/API flanges they MUST be forged. Casting is not allowed AFAIK.

RE: Casting equal to P92 pipe or F92 forgings

Rorschach,
I've seen a lot of cast flanges used, but not sure which code.  Where is the ASME and API requirements to use forged flanges?

RE: Casting equal to P92 pipe or F92 forgings

GRoberts brings up a good point, as far as I know ASME Section VIII Div 1 permits the use of cast flanges.

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