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  • Stainless steel

    Does anyone know what 18-8 means as it refers to stainless steel? In my books it is attached to several different types of stainless. I think it is a heat treat spec. If it is, what does it mean. Thanks for the help.

    Joe

  • #2
    No, it's not a heat treat spec, it's an alloy. I think it's more or less equivalent to 303, but I may be wrong on that.


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    • #3
      No, nothing to do with heat-treat.

      Just describes the relationship btwn the metallurgical ingredients in the recipe.

      18 % chrome , 8 % nickel. Most of the rest is iron.

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      • #4
        In an old Williams and Company "House of Metals" catalog the 18-8 is shown with several of the stainless alloys, 303, 304, 316, 321. In some examples: Type 316 18-8-SMO, Type 304L 18-8-S, Type 321 18-8-STI.

        Dr. Rob, Do they hold the melt to 18% chrome and 8% nickel. The specs show a spread 18-20% for chrome and 8-10% for nickel.

        It makes sence if the melt or heat is controled at these levels.

        Joe

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        • #5
          According to this it is the same base as 304,but has more chromium and less carbon.

          http://www.aksteel.com/pdf/markets_p...Data_Sheet.pdf

          AKsteel.com has lots of info on all stainless alloys.
          I just need one more tool,just one!

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          • #6
            Thanks for the information and site.

            Joe

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