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316LN thermal expansion properties

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davidsteel

Materials
Aug 26, 2005
2

To all,

Thanks for the forum. I am trying to help with a cryogenic design using 316LN plate. The thermal expansion of the plate may be an issue in a rotating, low RPM, environment.

We are trying to determine what the coefficent is so we can model the stress and design requirements of the components. The temperature would be a maximum 0°C to LNG temperatures.

There is some thought that the thermal expansion coefficent is not linear below 0­°C to LNG temp.

Procurement is going back to the plate manufacturer now but I thought I would ask the forum.

Any help or guidance is appreciated.

Regards,
Davidsteel
 
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I don't have specific data for 316LN SS, but my data from USS and AIRCO show that the expansion curve for Austenitic SS’s is pretty straight down to -200°F and then a slight flattening out below that point.

They show the expansion curves as:

Expansion; LT - L68 / L68 with all Austenitic listed being between
0.0021 and 0.0022 at -200°F

There was a good article on the web concerning INVAR piping that had some TE data on SS. For some reason I didn’t bookmark it and can’t find it now. The article was from Japan
 
To add, the thermal expansion for 316 SS is not linear. The graph of thermal expansion versus temperature shows a slight curvature for most of the 3XX series stainless steel between -400 to 2000 deg F.

The values for 316 SS are reported to about -350 deg F, at this temperature the value of thermal expansion is 8.0 x 10^-6 in/in deg F. At -200 deg F, the value is 8.25 and at 0 deg F, the value is 8.4. The source is Peckner and Bernsten.
 
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