Relating to exhaust systems:
(Type 409 SS is usually used for exhaust systems.
It is relatively cheap and head-resistant,
and BTW it is magnetic.)
http://www.acroni.si/eng_stainless_2.htm
Some more general stuff:
http://www.acroni.si/eng_stainless.htm
http://www.sd-plastics.com/stainless_steel.html
http://www.sppusa.com/reference/white_paper/wp_ss.html
From the latter:
>Ferritic grades have been developed to provide a group of stainless steel to
>resist
> corrosion and oxidation, while being highly resistant to
>stress corrosion cracking.
> These steels are magnetic but cannot be hardened or
>strengthened by heat
> treatment. They can be cold worked and softened by annealing.
>As a group, they
> are more corrosive resistant than the martensitic grades, but
>generally inferior to
> the austenitic grades. Like martensitic grades, these are
>straight chromium steels
> with no nickel. They are used for decorative trim, sinks, and
>automotive
> applications, particularly exhaust systems.
> Type 430
> The basic ferritic grade, with a little less
>corrosion resistance than
> Type 304. This type combines high resistance to such
>corrosives as
> nitric acid, sulfur gases, and many organic and food
>acids.
> Type 405
> Has lower chromium and added aluminum to prevent
>hardening when
> cooled from high temperatures. Typical applications
>include heat
> exchangers.
> Type 409
> Contains the lowest chromium content of all
>stainless steels and is
> also the least expensive. Originally designed for
>muffler stock and
> also used for exterior parts in non-critical
>corrosive enviornments.
> Type 434
> Has molybdenum added for improved corrosion
>resistance. Typical
> applications include automotive trim and fasteners.
> Type 436
> Type 436 has columbium added for corrosion and heat
>resistance.
> Typical applications include deep-drawn parts.
> Type 442
> Has increased chromium to improve scaling
>resistance. Typical
> applications include furnace and heater parts.
> Type 446
> Containes even more chromium added to further
>improve corrosion
> and scaling resistance at high temperatures.
>Especially good for
> oxidation resistance in sulfuric atmospheres.
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