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cingold
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High Temperature Service

04/09/2013 4:25 PM

In checking some vendor drawings for a pressure vessel, I noticed they called out SA-515 Gr. 70 for the shell instead of SA-516 Gr. 70. The design temperature is only 300 F.

I researched up and found that SA-515 is for Intermediate and High Temp services. Out of curiousity, what defines "intermediate" and "high" temperature services?
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bigg
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#1

Re: High Temperature Service

04/09/2013 5:05 PM

The primary difference between SA515 and SA516 is that SA515 is produced to coarse grain practices and is for use in high temperature applications. The coarse grains help to minimize high temperature creep and graphitization. SA516 is produced to fine grain practices in order to maximize the fracture toughness at lower temperatures. SA516 sometimes has difficulty meeting the toughness criteria at MDMT.
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cingold
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#2
In reply to #1

Re: High Temperature Service

04/09/2013 5:17 PM

Hmm maybe I didn't word my question very well.

I was curious what range of temperatures defines "high temperature service" or "intermediate temperature service." Do you know where I can find something that could tell me what range of temperatures are included for each?
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bigg
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#3
In reply to #2

Re: High Temperature Service

04/09/2013 6:31 PM

I don't have access to codes anymore, but I read somewhere that Section VIII allows usage of SA515 up to 1000degF, where SA516 is maxed at 800, maybe 850. I don't know that 'high', 'intermediate', and 'low' are ever defined in the code. In this case, I think 'high' would be in the range where creep is a consideration - definitely not 300degF. As long as they meet the impact requirements at MDMT, I suppose either would be acceptable, but I would prefer SA516. What was in the spec., or was it just 'carbon steel'?
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MJCronin
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#5
In reply to #3

Re: High Temperature Service

04/10/2013 10:19 AM

Respectfully, I disagree with bigg....

Neither grade of carbon steel SA515 nor SA516 should be subject to continuous operating temperatures above 775F.

A degradation mechanism known as "carburization" will eventually weaken the material to the point of failure.

Chrome-moly materials should be considered for service above about 800F.

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cingold
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#7
In reply to #5

Re: High Temperature Service

04/10/2013 10:33 AM

That's what I've read before too.

On a side note, is SA-515 the old firebox material?

I'm assuming that SA-515 is more expensive that SA-516 which is why it's used less often to typical vessels (at least that I've seen).
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bigg
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#8
In reply to #5

Re: High Temperature Service

04/10/2013 11:49 AM

I didn't say I agreed with it. Just said I had read that the code allowed it, but I can't confirm it since I don't have access to the code. I'm with you, I'd never use any carbon steel above 775 or 800degF.
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Anonymous Poster #1
#4
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Re: High Temperature Service

04/09/2013 11:32 PM
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cingold
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#6
In reply to #4

Re: High Temperature Service

04/10/2013 10:30 AM

Thank you! This is what I was looking for. Does that say Pressure Vessel Handbook for the source?
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Anonymous Poster #1
#9
In reply to #6

Re: High Temperature Service

04/10/2013 10:00 PM

You can find everything here . If you are smart, you can find shared copies in internet for free!!
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blackpanic73
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#10

Re: High Temperature Service

06/18/2013 6:53 AM

Hi,

temperature 300 C and above classified as high temperature service.

temperature between 100 C to 260 - 300 C APPROX. classified as intermediate temperature service.

temperature lower than 100 C to - 60 C classified as low temperature service.

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