254SMO^® S31254

Product features

• Product Origin

  Nippon Steel (Japan), JYK (Japan), Outokumpu (Sweden), JISCO (China)

• Standards

  ASTM A240/ASME SA-240, ASTM A276, ASTM A182/ASME SA-182, ASTM A312/ASMES A312

• Physical Properties

  Density: 8.24g/cm³

  Melting Point: 1320-1390 ℃

  Magnetism: None

• Mechanical Properties

  Tensile Strength: σb ≥ 655Mpa

  Yield Strength σb ≥ 310Mpa

  Elongation: δ ≥ 35%

  Hardness: 182-223 (HB)

• Corrosion Resistance

  254SMO stainless steel is a highly corrosion-resistant super austenitic stainless steel developed for environments containing halides and acids. Designed to withstand aggressive chloride-rich conditions such as seawater and high-concentration chloride ion media, it offers exceptional corrosion resistance where conventional stainless steels fail. In industrial applications involving acidic media—particularly acids containing halides—254SMO significantly outperforms standard stainless steels, and in many cases, it rivals the performance of Hastelloy and titanium. Its low carbon content and high molybdenum content provide excellent resistance to pitting, crevice corrosion, and intergranular corrosion, making it especially reliable in demanding chemical environments.

   

  It is a cost-effective stainless steel widely used in chemical, desulfurization, and other fields at home and abroad. In pure sulfuric acid, 254SMO shows significantly better corrosion resistance than 316L stainless steel. However, in high concentrations of sulfuric acid, its performance is slightly below that of 904L (NO8904). Notably, in sulfuric acid containing chloride ions, 254SMO provides the highest level of corrosion resistance among stainless steels. While 316L cannot be used in hydrochloric acid due to its susceptibility to both localized and uniform corrosion, 254SMO can be safely used in diluted hydrochloric acid at ambient temperatures. Pitting corrosion is generally not a concern below the critical temperature-pH boundary, though crevices should be avoided to maintain integrity.

  In environments containing hydrofluoric acid (HF) and fluorosilicic acid (H₂SiF₄), where conventional stainless steels offer limited protection, 254SMO performs well across a wide range of concentrations and temperatures.

• Applications

  Petroleum and petrochemical equipment, such as corrugated tubes in petrochemical equipment, pulp and paper bleaching equipment, such as pulp cookers, bleaching equipment, barrels and pressure rollers for filtration and washing, desulfurization equipment in power plants, including tower bodies, flues, damper plates, internals, spray systems, offshore systems or seawater treatment, such as thin-walled condenser pipes cooled by seawater in power plants, seawater desalination equipment, and can also be used in equipment where seawater may not flow, desalination industry, such as salt or desalination equipment, heat exchangers, especially in heat exchangers working environments with chloride ions.

• Matching Welding Materials

  High-alloy 625 series welding materials are recommended, namely ERNiCrMo-3 welding wire, ENiCrMo-3 welding rod, available in sizes Φ1.0, 1.2, 2.4, 3.2, 4.0.

• Supply Styles

  Sheet, strip, rod, wire, forgings, bright bars, welding materials, flanges, etc., can be processed according to drawings.