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Posted for "DON & PAT RYAN" <djpryan@ruralnet.net>:

400 series SS do NOT contain any nickel, and are not very rust resistant.
They are very strong and retain the strength at higher temperatures than
steel.

>Stainless Steel contains iron carbon and min. 11.5 chromium(Corrosion
>resistance) In the 300 series, 302 is the basic type  with 18% chromium
>and 8% nickel(18-8 stainless). 304 has increased chromium and nickel for
>more corrosion resistance and lowered carbon to reduce carbon
>precipitation during welding. 309 is the same as 304 only more so. 316
>contains molybdenum for improved corrosion resistance(especially sea
>water and chemical corrosives). 330 has an ultra high nickel content to
>resist corrosion in furnace atmospheres.
>
> Generally the 400 series has much the same properties but have lower
>tensile and yield properties. The exception of the martensitic grades
>which are hardenable by heat treatment. There are so many different
>types of stainless available but I guess purpose and cost would
>determine which one should be used.
>
>Grant Upton