Stainless Stl

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what is the thickness (ga) of type 304 stainless stl versus type 409 stainless stl??

Both stainless steels come in whatever gauge you want. Are you sure you are not talking composition?
Both types are used in auto exhaust systems. The 304 stainless resists rust better than the 409.

Here are the compositions for each. This information is readily available on the net.

Stainless Steel - Grade 304
Chemical Formula
Fe, <0.08% C, 17.5-20% Cr, 8-11% Ni, <2% Mn, <1% Si, <0.045% P, <0.03% S Stainless Steel - Grade 409 Chemical Formula Fe, <0.08% C, 10.5-11.75% Cr, <0.5% Ni, <1.0% Mn, <1.0% Si, <0.045% P, <0.03% S, 6x%C-0.75% Ti

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