Austenitic of Iron Alloy at low temperatures 2

[craghav]

Hi please enlighten me on the Iron alloys which have Austenitic structure at low temperatures and which can be produced in metal casting

 

[TVP]

Take a look at these two links:

http://www.sfsa.org/sfsa/pubs/hbk/s8.pdf

http://www.sfsa.org/sfsa/pubs/hbk/s9.pdf

 

[craghav]

Hello TVP, Thank you very much.. I'll look into those documents

 

[arunmrao]

Are you familiar with Invar alloy ? You may also refer to NiResist irons . Come back with more specific need or applications.

http://www.nickelinstitute.org/~/Me...Ni_ResistandDuctileNi_ResistAlloys_11018_.pdf

 

[craghav]

If I have to use casted part for Nozzle in LNG tanks (cryogenics) what material I should chose.. thats my question

 

[metengr]

Materials for LNG storage tanks can vary from 9%Ni to austenitic stainless steel, I would not recommend any cast material for nozzles. You will probably require a fabricated nozzle from rolled and welded plate using either 9%Ni or 3XX stainless steel for cryogenic application. Second, the materials of construction will be limited to whatever standard you are using for the LNG storage tank.

 

[arunmrao]

I agree, Metengr, you beat me to the post. Cast products for such application a BIG NO !

@craghav, have you experienced a cast part being used for such application?

 

[EdStainless]

The only cast parts are either internal to the system (non-pressure boundary) or something designed with 50:1 safety factors (like a valve body).
Your governing code with give a short list of material options and rules for fabrication.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[craghav]

My friend said we could use Nozzle 1/2 SCH Stainless steel... is that not casted part?

 

[metengr]

Not enough information to answer your question. Look at the material specification instead of listening to your friend.

 

[arunmrao]

craghav, I cannot vouch for your friend's advice, but I will certainly accept the opinions provided here. Look at the existing product and apply your mind.