UNS S31254 is a super austenitic stainless steel designed to withstand high pressures, stress corrosion cracking, and many other potentially hazardous events and materials. This high-end stainless steel contains high levels of chromium, molybdenum, nickel and nitrogen, which contribute to its excellent corrosion resistance and many other properties. This fact sheet will give you all the details you need to know about UNS S31254 and its global equivalent grades.

Fact Sheet

UNS S31254 is commonly available worldwide in several forms and for use in many industries. Although it is a popular choice for components in the chemical, marine and oil and gas industries, it also has other applications.

Available forms of UNS S31254

Depending on the manufacturer, UNS S31254 can be available in various formats to suit different uses, including:

  • Coils
  • Flanges
  • Flats
  • Fittings
  • Hexagon bars
  • Plates
  • Round bars
  • Sheets
  • Tubes (Available as seamless, seam welded, cold redrawn (and/or annealed), and straight.

As previously mentioned, UNS S31254 is commonly used in the gas and oil industries. Still, its high strength and good corrosion resistance make it a solid choice in seawater applications and many industrial environments. 

Applications of UNS S31254

  • Chokes
  • Heat exchangers
  • Pumps
  • Pipework
  • Valves

Properties of UNS S31254

One of the critical properties of UNS S31254 is its resistance to pitting and crevice corrosion, but additional benefits include its high ductility, impact strength and resistance to crevice corrosion. This steel can be used in sub-zero temperatures, and corrosive environments and is suitable as a replacement for the 300 series austenitic stainless steels. 

Mechanical Properties 

Elongation (%)50
Tensile strength98,600 (psi)
Yield Strength43,5000 (psi)

Physical Properties (at Room Temperature)

Density8.0 g/cm3
Electrical Resistivity8.5 μohm/cm
Heat500 J.kg-1.°K-1
Melting point1320-1390°C
Thermal Conductivity14 W.m -1.°K-1
Thermal Expansion16.5 μm/μm/C

Global Equivalent Grades

The Unified Number System (UNS) designation for this high-grade steel is 31254. Still, there are many different names for stainless steel UNS 31254. Other common names include 254SMO or 6Mo. In Germany, the Werkstoff steel specification is 1.4547, also known as Alloy 254.

UNS NumberS31254
Wekstoff / EN Number1.4529
EN nameX1CrNiMoCuN20-18-7
Other namesAlloy 254, SMO 254, 254SMO
ASTM SpecificationsA479, A473, A240, F44


Our steel products can be used in a variety of applications around the world because of their high corrosion resistance. UNS S31254 is particularly resistant because of its high molybdenum levels, which makes it ideal for saltwater applications and the oil and gas industries.  

Get in touch today for more information about UNS S31254 or any of our other steel products.