Alloy 255 Fasteners

We have experienced relatively low demand for Alloy 255 fasteners. Consequently, we stock very little.

Alloy 255 is a super duplex stainless which has a pitting resistance number greater than 40. Due to its copper content, it resists corrosion better than the other super duplexes, particularly in sea water applications.


Ferralium 255 (® Langley Alloys LTD)

Primary Resistance



ASTM A240 (Plate)
ASTM A479 (Bar)
UNS S32550
W-Nr 1.4507

Typical Tensile Strength (at room temperature in KSI)


Typical Chemistry (% by weight)

C .02, Cr 25, Cu 2, Fe 63, Mn 1.25, Mo 3.5, Ni 5.5, S .01, Si .75

Technical Data Sheet