What is 254 SMO?

Trademark information: 254 SMO is a trademark owned by Outokumpu OY. In solutions containing halides such as chloride and bromide ions, conventional stainless steels can be readily attacked by local corrosion in the form of pitting corrosion, crevice corrosion or stress corrosion cracking (SCC).

Is 254 SMO suitable for use in seawater?

Sandvik 254 SMO is, therefore, a suitable material for use in seawater. The weak point of conventional stainless steels is their limited resistance to crevice corrosion. In seawater, for example, there is a considerably greater risk of crevice corrosion under gaskets, deposits or fouling.

What is the recommended heat input for 254 SMO?

For Sandvik 254 SMO, heat-input of <1.5 kJ/mm and interpass temperature of <100°C (210°F) are recommended. A string bead welding technique should be used. Nickel alloys with high molybdenum and chromium must be used as filler metals to have good corrosion resistance in as welded condition.

What is the pre number of Sandvik 254 SMO?

A parameter for comparing the resistance to pitting in chloride environments is the PRE number (Pitting Resistance Equivalent). The PRE is defined as, in weight-%, PRE = %Cr + 3.3 x %Mo + 16 x %N PRE-value for Sandvik 254 SMO = ≥42,5.