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# 316LN thermal expansion properties

## 316LN thermal expansion properties

(OP)

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

### RE: 316LN thermal expansion properties

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

### RE: 316LN thermal expansion properties

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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