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Chapter 3: Applications of Common Stainless Steel Alloys
Below, a number of common Damstahl stainless steels are listed together with their most common
use. All types are listed according to the new EN standards, which almost (but not 100 %)
correspond with the old W.Nr. system. The requirements of the AISI numbers are rarely identical
with those of the parallel EN numbers, so instead, they should be regarded as the closest standard.
Consequently, the translation should therefore be regarded as approximate, not absolute.
Ferritic Stainless Steel:
EN 1.4003 / AISI 410
The simplest stainless steel, containing approx. 11 % Cr and the rest iron (Fe). Due to the absence
of Mo and Ni, 4003 is a cheap alloy possessing a relatively poor corrosion resistance. Possesses
a fine mechanical strength and may be forged as well as welded and can be used for a number of
applications where mild carbon steel is inadequate, i.e. cars and buses, or where galvanized steel is
used indoors. For improved weldability, the Ti stabilized parallel is EN 1.4512.
EN 1.4016 / AISI 430
16 % Cr steel possessing good mechanical strength and a superior corrosion resistance compared
to the 4003. With regard to pitting corrosion above/below water, 4016 is close to but still slightly
inferior to the austenitic 4301. 4016 possesses a good heat resistance and may be used up to 800
ºC. However, welding is tricky, and a post-treatment is recommended in order to avoid brittle intermetallic
phases along the welds. Widely used as sheets and coils for catering purposes. 4016 may,
however, also replace galvanized steel for indoor purposes.
EN 1.4113 / AISI 434
Molybdenum containing (1 %), ferritic steel possessing a good corrosion resistance to chloride
containing media; roughly in between the 4301 and 4401 classes. Due to the absence of stabilizing
elements (Ti, Nb), the 4113 cannot be welded and should be used as coils or sheets.
EN 1.4509 / AISI 441
Ti-Nb stabilized, ferritic, 17½ % Cr steel, corresponding to a slightly upgraded 4016 (AISI 430), with
improved properties. Due to its good corrosion resistance, weldability and relatively low and very
stable price, 4509 is one of the most interesting and useful steels on the market and may be expected
to replace 4301 in many major applications such as catering, building construction and heat
exchangers. Theory as well as practice have shown 4509 to equal 4301 with regard to pitting corrosion
(Chapter 4 + 5), and for hot parts, the ferrites are generally superior to the austenites due to
their improved resistance towards SCC. Furthermore, 4509 has got a great potential as a substitute
for galvanized steel. However, like all ferrites, it is only available as thin sheets or pipes. For all ferritic
stainless steel types, care must be taken to ensure that the right welding process, filler metal
and parameters are chosen.
EN 1.4510 / AISI 439 (430Ti)
With 15.5 % Cr, the 4510 corresponds to a Ti stabilized 4016 (no Nb). As 4509, the 4510 is weldable,
but it is slightly less corrosion resistant than 4509 and harder to get. This combination is bound to
make the 4510 a rare bird.
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01.2013