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AWS SS 321 Spot Welding Specifications

AWS SS 321 spot welding involves using a stainless steel alloy in the welding process. There are many different types of stainless steel (410, 416, 302, etc.) and they are classified and numbered by their crystal structure. The three classifications of stainless steel are austenitic, martensitic and ferritic. Stainless steel 321, an austenitic steel, is similar to 304 but with the addition of titanium, which is intended to reduce carbide precipitation. Reduced carbide precipitation is important for welding, which is why SS 321 is popular with welders.

  1. Carbon Content

    • The carbon content of SS 321 is 0.08 percent.

    Silicon Content

    • The silicon content of SS 321 is 0.75 percent.

    Manganese Content

    • The manganese content of SS 321 is 2 percent.

    Chromium Content

    • The chromium content of SS 321 ranges between 17 and 19 percent.

    Nickel Content

    • The nickel content of SS 321 ranges between 9 and 12 percent.

    Phosphorus Content

    • The phosphorus content of SS 321 is 0.045 percent.

    Sulfur Content

    • The sulfur content of SS 321 is 0.03 percent.

    Nitrogen Content

    • The nitrogen content of SS 321 is 0.1 percent.

    Titanium and other elements.

    • The remainder of SS 321 is made up of titanium (about 0.7 percent) and a mixture of other elements including molybdenum and iron.

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