Metal choice for high temp. and pressure 4

[metalguesser]

Hi All!

One of our customer needs a forged nozzle for a high temperature (1863 deg F)and pressure (100 psi) application. Customer wants us to quote with suitable material. We are planning to offer Incoloy- 800HT for this application. However we have not been able to find any data to corroborate our choice. ASME B564 does not specifically comment on the suitability at this temperature and pressure. It merely states that "Alloys UNS N08810, N08120 and UNS N08811 are normally employed in service temperatures above 1100 deg F where resistance to creep and rupture is required...." Any idea where I can find relevant data for this?? Any pointers or help is greatly appreciated.

Thanking you in anticipation,

Regards

 

[metengr]

metalguesser;
I would recommend you visit the Special Metals web site for information. This is a decent web site for technical information, and several of their materials folks sit on ASME B&PV Code subgropus and subcommittees. You will be very limited on code-approved materials for this application.

http://www.specialmetals.com/index.php

 

[davefitz]

up in this temperature range it is normal to provide air cooling or steam cooling of the part, to ensure the metal temp is sufficiently lower than the process temp to ensure reliable use of conventional alloys.

there is a lot of recently published tech papers on air cooling of nozzles, as applied to modern gas turbines. For example, if you install a ceramic barrier coating on the hot side and extended surface ( fins) on the air cooled side, the mean metal temp will be biased toward the cold air temp and conventional alloys could be used.

 

[EdStainless]

After the Special Metals web site (good info, poor site) you should pull your ASME B&PV Code Section II D and flip to the back. There are properties listed as a function of temp for various alloys.
I don't think that the code would allow any use over 1500F. In the 1600-1700 range you run out of useful strength.
Steam cooling is something that you should look into.

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Plymouth Tube

 

[metengr]

Well, if you dust off ASME B&PV Code, 2007 Edition, Section II, Part D, locate Table 1B you will see some Ni-base alloys permitted to 1800 deg F. There are a few alloys, as I stated in my original post.

 

[berrojalbiz]

we have a furnace that works at 980ºc and 20 kg/cm2 internal pressure we use incoloy 800ht and sone materials like centraloy from Centracero , Spain