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What is SMO 254?

SMO 254 is super-austenitic stainless steel that offers good corrosion resistance, particularly in chloride-containing environments. It has high molybdenum, chromium, and nitrogen content. It has higher strength and ductility than other types of stainless steel, making it suitable for use in various industries such as chemical, petrochemical, and marine.

What is SS 316?

SS 316 is a popular grade of stainless steel known for its corrosion resistance and high-temperature strength. Its properties are due to a combination of metals, including chromium, nickel, and molybdenum. Stainless steel 316 is commonly used in food and beverage processing, pharmaceuticals, and medical devices.


254 SMO vs 316

Grade SMO 254 Stainless Steel 316
Corrosion Resistance Excellent resistance to chloride stress corrosion cracking, pitting, and crevice corrosion Generally more resistant than 304; good in atmospheric environments and many corrosive media
Strength Twice that of stainless steel 300 series Lower than SMO 254
Machinability Difficult due to high work hardening rate and lack of sulfur content Good
Weldability Requires filler materials for good strength properties Excellent
Heat Resistance Good up to 1204 °C Good up to 870 °C
Hardening Not responsive to heat treatment Only possible through cold reduction
Applications Saltwater handling, tall oil distillation columns, flue gas desulfurization scrubbers, petroleum production components, food processing equipment, chemical industry process equipment, pulp and paper industry bleaching equipment, flue-gas cleaning, desalination, heat exchangers Industrial, architectural, and transportation fields; marine environments

Difference in Chemical Composition:

Grade % Ni Cr Mo Cu N C Mn Si P S
SMO 254 Min. 17.5 19.5 6 0.5 0.18          
Max. 18.5 20.5 6.5 1 0.22 0.02 1 0.8 0.03 0.01


Grade C Mn Si P S Cr Mo Ni Fe
SS 316 0.08 max 2.0 max 1.0 max 0.045 max 0.030 max 16.00 - 18.00 2.00 - 3.00 11.00 - 14.00 67.845 min

 Difference in Equivalent:

SMO 254 1.4547 S31254 Z1 CNDU 20.18.06Az 2378 X1CrNiMoCuN20-18-7


SS 316 1.4401 S31600 SUS 316 Z7CND17‐11‐02 X5CrNiMo17-12-2


SMO 254 offers superior corrosion resistance, strength, and heat resistance compared to stainless steel 316, but is more difficult to machine and requires specific filler materials for welding. Stainless steel 316, on the other hand, offers good machinability and weldability, making it a suitable option for a variety of industrial applications.

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