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asifraza
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Join Date: Nov 2008
Posts: 3

Suitable Material for High Temperature

11/06/2008 10:16 AM

I have got a vessel; the normal operating temperature is 1400 def and the design is about 1600 deg F. I've found out that I can use "SS 321 H" for this application. This equipment is not subjected to stress corrosion cracking at the operating temperature.

Similarly, another whose design temperature is 1200 deg F and I want to employ "SS 316H", this vessel is also not subjected to stress corrosion cracking at the operating temperatures. Your responce regarding the suitable mettarlurgy for both the equipment will be greatly appreciated.
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Anonymous Poster
#1

Re: Suitable Material for High Temperature

11/06/2008 12:08 PM

Are these pressure vessels designed to a code?

What is the service of these vessels? That is, what do they contain?
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asifraza
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Join Date: Nov 2008
Posts: 3
#2
In reply to #1

Re: Suitable Material for High Temperature

11/06/2008 12:11 PM

The diameter of these vessels are less then 6" hence they are designed to ANSI B 31.3.

During normal operation, these vessels are filled with hot sand particles combined with hot air OR Nitrogen.
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Morgan 23
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Join Date: Mar 2008
Location: USA Soviet Socialist Dictatorship of Cook County& Illinois
Posts: 207
Good Answers: 15
#3

Re: Suitable Material for High Temperature

11/07/2008 6:32 AM

316H for 1200 °F is an acceptable choice. I have customers that use it at those temperatures. 321H has allowable stress values up to 1500°F. Your 1600°F is beyond the allowable as far as the ASME Code is concerned. Even though the pipes are not ASME Code, B31.3 defers to ASME for sress values.

It sounds like you are using these vessels or pipes for catalytic reactors. I have usd Inconel SB 407 - UNS 80810 commonly referred to as Inconel 800H for such reactors at temperatures up to 1800 °F.
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asifraza
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Join Date: Nov 2008
Posts: 3
#4
In reply to #3

Re: Suitable Material for High Temperature

11/07/2008 10:04 AM

Morgan, These vessels are not filled with Catalyst BUT with sand; this is a proprietary process developed by the customer.

It seems that if I lower the design temperature to 1500 deg F, can I use still use 321 H, the design pressure is only 50 psig. I want to keep the cost down and avoid the use of Nickel alloys if possible.

Thanks for your help.

Asif
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