654 SMO (UNS S32654 / W.Nr. 1.4652)

654 SMO (UNS S32654 / W.Nr. 1.4652) is a super austenitic stainless steel containing 23% nickel, 25% chromium and 7% molybdenum. Its corrosion resistance is comparable to that of the best nickel-based alloy. As the nitrogen content of 654SMo is twice as high as 254SMo , its intensity is higher than 904L and 254SMo. There are two smelting method for 654SMo super austenitic stainless steel: 1) the currently popular argon-oxygen decarburization refining smelting in abroad -VOD or AOD; 2) continuous casting method used for producing stainless steel.

Equivalent Grades

654 SMO
Acero 654SMo

Chemical Composition, %

654 SMO≤0.02≤0.502.0-4.0≤0.03≤0.00524.0-25.021.0-23.07.0-8.00.3-0.60.45-0.55Bal

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HB

Available Products and Specifications

Rod, Bar, Wire and ForgingsASTM A479, ASTM B276
Plate, Sheet and StripASTM A240, ASTM B480
Pipe and TubeASTM A358, ASTM A312, ASTM A409, ASTM A813, ASTM A814, ASTM B690
Welding Product
OthersASTM B366


Due to its high molybdenum, when 654S MO super austenitic stainless steel is subjected to seamless pipe perforation, it is hard and sticky, easy to get eccentric or crack. To avoid the risk in perforation, our company chooses to punch holes in the center of round steels and then directly put on the rolling mill for cold rolling or cold drawing to produce seamless pipe. Although the cost is increased, it secures high success rate.

654SMo (S32654, 1.4652) super austenitic stainless steel features very good local corrosion resistance, good pitting resistance and good stress corrosion resistance under seawater, aeration, gap and low speed scouring conditions. It can be used as a good substitute to nickel-based alloys and titanium alloys. When it comes to high-temperature resistance or corrosion resistance, it is also superior to 904L and 254SMo.


  • Pressurized and erosive systems handling chlorinated sea water at higher temperatures
  • Plate heat exchangers
  • Flue gas cleaning
  • Process equipment in chemical industry
  • Bleaching equipment in the pulp and paper industry
  • Desalination
  • Hydrometallurgy
  • Food and beverage
  • Pharmaceuticals