The Ferritic Solution - Euro Inox
The Ferritic Solution - Euro Inox
The Ferritic Solution - Euro Inox
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Corrosion resistance properties<br />
Stainless steels are “stainless” because their chromium content gives them<br />
exceptional resistance to corrosion.<br />
all steels are prone to corrosion, to varying degrees. Stainless<br />
steels, however, are significantly more corrosion resistant<br />
than carbon steels, due to the chromium they contain.<br />
chromium (not nickel, as is sometimes imagined) is the key<br />
ingredient in the corrosion resistance of stainless steels.<br />
LocaLiSed coRRoSion ReSiStance<br />
Stainless steel applications are mostly maintenance-free<br />
but, in some cases, light maintenance (removal of deposits,<br />
for example) may be necessary, to ensure corrosion-free<br />
service life.<br />
the corrosion resistance of stainless steels is determined<br />
more by chemical composition than by austenitic or ferritic<br />
atomic structure. indeed, in terms of resistance to corrosion,<br />
ferritics and austenitics can be seen as two interchangeable<br />
stainless steel families.<br />
Moisture separator reheater in grade 439, <strong>Euro</strong>pe.<br />
be seen as two interchangeable<br />
stainless steel families.”<br />
a comparison of the corrosion–resistance properties of<br />
the five ferritic “groups” with those of austenitic type 304<br />
clearly highlights the key role of chromium and shows that<br />
the corrosion resistance of nickel-containing (austenitic)<br />
grades can be matched by the majority of ferritic families.<br />
fERRitic/austEnitic LocaLisEd<br />
coRRosion REsistancE<br />
410L<br />
409<br />
430<br />
304<br />
441<br />
439<br />
- corrosion resistance + “…ferritics and austenitics can<br />
PRE 10 16 17 18 20 24<br />
the above chart shows that only molybdenum-containing<br />
ferritic grades have better localised (“pitting”) corrosion<br />
resistance than 304. however, stabilised ferritic standard<br />
grades, although positioned slightly below 304, still have<br />
very good resistance to pitting corrosion.<br />
436<br />
G1 G2 G3 G4<br />
Radiator grill and trim, in grade 436.<br />
316<br />
444<br />
Partially 444 building cladding, Brazil.<br />
1
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