I have been searching [unsuccessfully] for data on both the elasticity and density figures for 316 st/steel at low temperatures. I should explain that I do resonant frequency calculations for metal thermowells. The above figures are necessary to ensure that the ‘wells are fit for purpose. Most of the time the temperatures are well above ambient, but I have an application where the temperatures are sub-zero. Do you have any figures for density and/or elasticity at temperatures from say 170 K down to 70 K? If I have these points can I interpolate to get reasonably accurate figures for temperatures in between?
3 Comments
Dr. Randall F. Barron
August 1, 2008There is very little data on the cryogenic properties of 316 stainless (however, there is a wealth of data for 304 stainless). From: R. L. Tobler, “Near Threshold Fatigue Crack Growth Behavior of AISI 316 Stainless Steel,” in ADVANCES IN CRYOGENIC ENGINEERING–MATERIALS, vol. 32, Plenum Press, New York, (1986), pp. 321-327.
Temp., K Young’s modulus, GPa
————– ———————————
295 195
4 208
————————————————–
For the temperature range between 77 K and 300 K, Young’s modulus varies by only about 7% and the variation is practically linear; therefore, a straight-line interpolation for Young’s modulus may be used.
There is little density data in the literature; however, the density also varies by fairly small amounts between room temperature and liquid nitrogen temperatures (77 K). If do is the density at temperature To, and a is the mean thermal expansion coefficient (K=AD1), then, the density at any temperature T may be estimated by:
d =3D do[1 + 3a(To =AD T)]
For example, at 77 K, the density for 316 stainless would be:
d =3D (7.97)[1 + (3)(13.0)(10=AD6)(295 =AD 77)] =3D (7.97)(1.0085)
d =3D 8.04 g/cm3
The density changes by only about 0.9% from room temperature.
Marinco Lefevere
August 1, 2008It may be possible to find the info at: http://cryogenics.nist.gov/MPropsMAY/material%20properties.htm.
Santiago Sanz
August 1, 2008You can find in the following internet link some properties that could be useful for you:
https://trc.nist.gov/cryogenics/materials/316Stainless/316Stainless_rev.htm
Here, there are data for the Young’s modulus and for the thermal expansion of AISI 316. Perhaps you can obtain the density from the thermal expansion data.