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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
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