Letter 40021

Blue coloration on stainless steel when subjected to heat  

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I wish to know what temperatures stainless steel pipe of grade AISI 316L has reached if blue spots are observed on pipe when it is subjected to heat in limited air atmosphere for a duration of 75 minutes.

ABHIJEET NANDEDKAR
MANUFACTURING - BHILAI, CHATTISGARH, INDIA

This is one of the weirdest thermometers I've ever heard of, Abhijeet :-)

Please provide the background and why you want to know. Thanks and good luck!

Ted Mooney, P.E.  finishing.com Brick, New Jersey

Hi Abhijeet,

I am sure you will find the answer at the Nickel Institute. Check out their web page www.nickelinstitute.org.

Have fun,

Tony Johnston
- Doncaster East, Melbourne, Australia