Alloy 20 Thermal Expansion

[StressGuy]

Alright, I've googled until my eyes bleed with no luck. I have an Alloy 20 duct system that I am specing out an expansion joint for. I cannot for the life of me find a reference on what the thermal expansion of this material is.

If someone in the group has a table, or a source for a table, I'd appreciate finding out what the rate is at 600 and 800°F

Thanks,

Edward L. Klein
Pipe Stress Engineer
Houston, Texas

"All the world is a Spring"

All opinions expressed here are my own and not my company's.

 

[StressGuy]

Looks like I finally tracked it down at the Carpenter Technology website

http://www.cartech.com/index.html

The setup is such that I can't make a direct link (frames, I think). From the main page, go to "Technical Information" over on the left side. Click on "Alloy Name Search" and put in 20. Alloy 20 will be the second result "20Cb-3 Stainless"

Enjoy,
--ED

Edward L. Klein
Pipe Stress Engineer
Houston, Texas

"All the world is a Spring"

All opinions expressed here are my own and not my company's.

 

[NozzleTwister]

Hi Ed,

I have the following data from an old brochure for Carpter 20Cb-3 Stainless and it matches the data on their site.

77 F to 25 C to in x 10e-6/Deg F
212 100 8.16
572 300 8.62
662 350 8.71
752 400 8.76
842 450 8.84

Hope this helps.

Kevin

NozzleTwister
Houston, Texas

 

[NozzleTwister]

BTW, you need to register on the Carpenter website to access the data.

NozzleTwister
Houston, Texas

 

[NozzleTwister]

unclesyd,

I had that too but didn't post it since StressGuy only asked for 600F and 800F.

Confirm that you have a typo for 842F, the number should be 8.84 instead of 5.84.

I also have an old paper from Carpenter Technology dated 10/76 that has coefficients different from what they publish today.

NozzleTwister
Houston, Texas

 

[unclesyd]

I have one extra value from some very old literature.

77°F-212°F 8.16
77°F-842°F 8.54
77°F-1652°F 9.53

NozzleTwister,
I too have numbers that are slightly different If I recall correctly that there were two alloys at one period of time as I have some engineering data that says Alloy 20 and some from about the same time that says Alloy 20-3Cb.