In one of jobs I am dealing with Duplex material A790 S31803. Design Temperatures T1 : 120 Deg.C, T2 : -46 Deg. C.
As per B31.3, this material can be used from -51 Deg.C to +315 Deg.C.
In the Caesar Library table for this material (338)A790 S31803, it is not updated for lower than 21.11 deg. So I am getting error 60E.
To update the table for complete range where can I find the values of expansion coefficient, allowable stress, and elastic modulus.
Thanks in advance.

Since this particular issue has been popular among users, we have spent quite some time searching for this data. This URL is the only source we have found for the expansion coefficient for S31803. Note that the low end of the temperature scale is ambient, so while we did incorporate this information into the CAESAR II Material DataBase, you can't use it below ambient - this is why you're getting error 60E.

The solution here is for you to contact whomever you are going to purchase your pipe from, and ask them for the material properties. (Hopefully they can provide this information to you in a formal brochure or publication. If you then forward this information to COADE, we will update the Database.)

Hello Richard,
Another problem I am facing with (338)A790 S31803 from library is, even for ambient temperature I am getting error 60E. Where as, in Spread sheet it properly shows allowables for the amb. temperature.
When I did same exersise for Version4.4, it shows warning 121E, about hot allowables not specified.
Is it due to change in Library for Ver.5? How to deal with it while working in Vesion5?

I am writing it on forum to check, if anybody experiencing the same problem? I am using Ver.5.
Please address it, if you need my soft file, I will send it to you.

Make sure that none of your "element temperatures" and your ambient temperature are below 70 deg F. Note that if you're working in metric, 70 degF converts to 21.111111111 degC, so if you defined ambient as 21 degC, that's your problem.

has there been any update to the issue? i am having the same problem. Has there been values given for temperatures lower than the ambient?

Thanks in advance

Richard

Not that I'm aware of.

This thread is very timely. I too am starting a project where we have a lot of duplex SS pipe and we have temperatures below the normal ambient of 21.111 deg C. (70 deg. F). Our pipe code is B31.3

Our installation temperature and Ambient for the job is 4 deg. C. and we have minimum temperatures down to -7 deg. C.

Our pipng materails for the job are:
Pipe => A790 S31803 Smls & A928 S31803 CL5
Welding Fittings => A815 S31803

I read the posts above, I'm just adding my name to the list of those needing lower temperatures capabilities for this materail in Caesar II.

Thanks,

There is expansion data on several manufacturers' websites, eg. Allegheny Ludlum, Sandvik, Sandmeyer. Other sources include TEMA and ASME Section II Table TE-1 (Group 2 alloys). These latter two sources show somewhat lower expansions than the manufacturers.
None that I have seen have sub-zero (degC) temperatures. However it is worth remembering that duplex is a mixture of austenitic and ferritic steel grains. The available expansion data is between that of austenitic and carbon steel, therefore it is a reasonable assumption that its lower temperature coefficients will follow a similar behaviour and an educated estimate can be made on this basis.
One thing that is rarely mentioned is that materials specs usually permit the percentage of ferrite to vary between 25% and 55 or 60%. Therefore I think it best to err on the higher side when estimating expansion so I use a custom material definition using the upper end of the range of manufacturers data.

regards
Martin

If there are no values then measure them. To measure thermal expansion coefficient is not that difficult. Some basic methods are listed in
http://irc.swan.ac.uk/ThExpansion.htm#Experimental%20Techniques

Many moons ago I did measurements. Equipment I had was plastic bucket, thermometer, measuring gauge from tool room and water out of tap.

To get sub zero you could use dry ice (CO2) for cooling. You should get down to about -78 C/-109F.

I used 250 mm long sample and the results were accurate. If somebody is interested I can send sketch of the arrangement I used (or I will upload the image if I can figure out how to do it. Last time did not work.)