254SMO (S31254)

UNS S31254 / 1.4547

254SMO is a high-molybdenum, nitrogen-alloyed super austenitic stainless with a pitting resistance equivalent number above 42. That puts it well beyond 316L and 904L in chloride pitting and crevice resistance, at a fraction of nickel-alloy cost.

It is used for seawater heat exchangers, bleach plants, FGD scrubbers and pulp mill equipment — anywhere chlorides would pit a 300-series grade. It has good ductility and weldability, but does require the correct filler and heat input.

Properties

• Very high resistance to crevice and pitting corrosion in chlorides
• High ductility and impact strength
• Good weldability with matching consumables
• Substantially lower cost than nickel-based alloys at similar chloride resistance

Applications

• Seawater cooling and desalination
• FGD scrubbers and ducting
• Pulp and paper bleaching
• High-chloride chemical and food processing

Forms supplied

• Flanges and fittings
• Bar, plate and forgings
• Pipe and tube

Standards

ASTM A182 (forgings), A240 (plate), A312 (pipe), A276 (bar)