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Posted for "DON & PAT RYAN" <djpryan [at] 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