Material Properties at Elevated Temperatures

If the material is made to a specification, usually the spec. has that sort of information. For instance a AMS or etc. type spec.

I am guessing your material is not per a spec. or you would already know that?

The best source for that information is ASME Section II - Part D

(however, without running through it - I doubt you will find that exact steel in there)

Would the ASTM standards have more comprehensive material data not used in pressure vessels? I don't have the budget to justify buying the ASME standards for this non-critical application (exhaust components) especially if they don't address the materials I am using. I have also talked to my supplier and was referred to a mill metallurgist who passed the buck on to a professor that won't return my calls or e-mails (go figure).

I can check quite a few references including the ASTM standards (when I get home in a few hours) -

Can you confirm the exact specification?:

AMS 5110 , AMS 5110B , ASTM A29 , ASTM A510 , ASTM A576 , ASTM A682 , FED QQ-S-700 (1080) , MIL SPEC MIL-S-16974 , SAE J403 , SAE J412 , SAE J414 , UNS G10800

MMPDS 01 is withdrawn however I could get a link on site

http://www.apesolutions.com/spd/public/.

for down load you can check up the properties on Chapter-2 pages 2-25 to 2-30

1. First, define your operating conditions more completely. In particular, how long a time at 1250 F, what load or stress, is the load constant or cyclic, and is the service atmosphere oxidizing, reducing, or neutral?

2. Your choice of steel is seldom used at temperatures above 200-300F for appreciable times. Once you've completed step 1, come back and I think that I can point you in the direction of useful information. Rmember, asking the "right" question will materially aid you in finding a "right" answer.

I understand that the material is not ideal for the situation and that there are all sorts of issues when using it above 30% of the melting temperature but I am in a situation where it is all I have to work with.

The time at temperature will vary from 1 hour or less up a max of about 24 hours. This is for exhaust components so the service atmosphere will be exhaust gases (diesel, natural gas, or gasoline) and will cycle from full temperature back to ambient many times.

The load is minimal with respect to the strength at room temperature but there will substantial vibrations to the system.

Hello ZAC,

You have given extra info on the uses like vibration and for use in up to 24 hours. You also say it is not ideal for the situation. But, what would be ideal and why can you not use it? Is it the word 'money' and 'cost'?

If that was not a criteria what would you use that you know is suited to the use you want it for?

Can you say what thickness you use? Does this steel you are using fail at welds or pipe length seems? What is its expected life?

Take care................

Hello sb,

Sorry I am on and off the computer. Were you taying something to me? IPR? Inter personal relations? We will have to stop meeting like this! LOL!

Just for a little bit of a conclusion to this I have found the information in the Key to Steels Database. It is a bit expensive but it has the information I was looking for and then some. Thank you all for your help.