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Thread: 440C to 316SS

  1. #1
    Join Date
    Dec 2005
    Location
    Westborough, MA
    Posts
    2

    Default 440C to 316SS

    My first post. In another life I was a pipefitter/welder. I was a hand? Not anymore! Can't see for one thing and haven't kept my hand in. Anyway, a hobbyist now and trying to join the above metals. I have a Syncrowave 180, a 135 mig and a Hypertherm 380. All nice gear for my needs (auto resto, small fabrications). BTW, the metal dimensions to be welded are about 3/4 x 5/16. The 316 can be another alloy but must be corrosion resistant and tough. Suggestions welcomed!

  2. #2
    Join Date
    Oct 2005
    Location
    Central Florida
    Posts
    193

    Default

    Jafre,

    The problem is the 440C, not the 316. The austenitic stainless steels like 316 are readily weldable. The martensitic stainless steels like 440C tend to form a brittle microstructure in the HAZ. Pre-heat (>500F) is necessary and post weld tempering is recommended.

    Does this help?

  3. #3
    Join Date
    Oct 2005
    Location
    Benton, IL
    Posts
    757

    Default

    I agree with Bill. If you can eliminate the 440 from the weldment, you'll be way ahead. An ideal material might be 316L (low carbon), as it is one of the most weldable of the stainless steels.

    "Grade 316L has outstanding welding characteristics. Post-weld annealing is not required when welding thin sections.
    Grade 316L is the low carbon version of 316 and is immune from sensitisation (grain boundary carbide precipitation)." A top choice for marine weldments & other conditions of harsh exposure.
    Barry Milton
    ____________________

    HTP Invertig 201
    HTP MIG2400

    Miller Trailblazer 302, Spoolmatic 30A, Suitcase 12RC
    Clarke Hotshot

  4. #4
    Join Date
    Dec 2005
    Location
    Westborough, MA
    Posts
    2

    Default The problem is, the 440 is the necessary part.

    Back to the drawing board. Thanks for the info, and yes, of course it was helpful.

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