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  • 1.  Heat color chart for 304 stainless

    Posted 02-10-2025 13:11

    Greetings,

          There is a multitude of color charts on the web for the emission colors of steels as a function of temperature. 

         We're looking for a reference that we can use in a journal paper.

    Thanks for your attention.

    Bob



    ------------------------------
    Robert Utter
    Research Faculty
    UNIVERSITY OF MARYLAND
    HYATTSVILLE MD
    (301) 439-0436
    ------------------------------
    IMAT Conference & Expo


  • 2.  RE: Heat color chart for 304 stainless

    Posted 02-11-2025 08:37
    Rob -  

    Are you looking for post temper or at temperature?

    regards,
    - Jim





    IMAT Conference & Expo


  • 3.  RE: Heat color chart for 304 stainless

    Posted 02-11-2025 11:31

    Thanks for your consideration.  Lacking a thermal camera, we're trying to give an approximate temperature range that the 304 stainless reached as a sample cup over a propane flame.  We have pictures of the emission color.  We'd like a technical reference that we can point to and say "orange" indicates this ....



    ------------------------------
    Robert Utter
    Research Faculty
    UNIVERSITY OF MARYLAND
    HYATTSVILLE MD
    (301) 439-0436
    ------------------------------

    IMAT Conference & Expo


  • 4.  RE: Heat color chart for 304 stainless

    Posted 02-12-2025 10:03

    All,

    The article "Temper Colors for Steels" in ASM Handbook, Vol. 4D, "Heat Treating of Irons and Steels,", J. Dossett and G.E. Totten, editors, pages 550 and 551 addresses this subject in Figure 1 for plain carbon steels.

    Sincerely,

    John Tartaglia



    ------------------------------
    John Tartaglia
    Senior Metallurgical Engineer
    Element Materials Technology Wixom Inc
    Novi MI
    (248) 207-0893
    ------------------------------

    IMAT Conference & Expo


  • 5.  RE: Heat color chart for 304 stainless

    Posted 02-12-2025 10:15

    Good morning John,

         Thank you very much for your help.

    Bob



    ------------------------------
    Robert Utter
    Research Faculty
    UNIVERSITY OF MARYLAND
    HYATTSVILLE MD
    (301) 439-0436
    ------------------------------

    IMAT Conference & Expo


  • 6.  RE: Heat color chart for 304 stainless

    Posted 02-13-2025 10:07
    Emission colors are independent of material. These are described by the Planck black body radiation equation (1900).
    Temper colors vary with material and with surface conditions. Stainless steels, being more resistant to oxidation, need to get hotter to show the same colors shown by low alloy steels at lower temperatures. Different stainless steels will show slightly different temper colors at the same temperatures. Surface contamination (hand prints, residual cleaning agents, etc.) and atmosphere will affect temper colors.

    -John Grubb - Sent from my iPhone


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