UNS S31254, also known as Alloy 254 SMO or EN 1.4547 is a premium super-austenitic stainless steel designed for the most aggressive corrosive environments. It contains very high levels of chromium (19.5–20.5%), nickel (17.5–18.5%), molybdenum (6.0–7.0%) and nitrogen (0.18–0.25%).
254smo material Suppliers
HT PIPE is a well-known stockist and exporter. We are a 254smo material supplier with 15+ export experience. We not only provide pipes, stainless steel 254smo Plate, round bars, but also pipe fittings, flanges, etc. Contact us for more information and prices for free.
254smo Vs 316/316L
Standard 316L has lower Mo/N and weaker corrosion resistance. 254 SMO has about double the strength of 316L and vastly higher pitting resistance (PREn~42 vs ~24). In hot saline tests, 316L fails (F) in stress corrosion cracking where 254 SMO passes (P). In short, S31254 will survive in brine or seawater where 316L corrodes rapidly.
smo 254 Vs Alloy 904L
904L has more nickel and some copper, giving it exceptional resistance to sulfuric and other reducing acids. However, its lower Mo (4–5%) and lack of nitrogen mean its chloride resistance is lower.The higher Mo/N of S31254 yields far better pitting/crevice performance in salt spray or seawater, whereas 904L is often preferred for high-strength sulfuric acid service. Mechanically, S31254 has ~40–50% higher strength (YS ~300 vs ~220 MPa) and hardness (~250 HB vs ~180 HB) than 904L.
S31254 Vs Duplex 2205
Duplex 2205 has a ~50/50 ferrite/austenite structure and much higher strength (YS ~500–520 MPa, nearly twice S31254), with good chloride resistance (PREn 42 vs ~36) and excellent SCC resistance (both 254SMO and 2205 passed NaCl SCC tests). In practice, 2205 is chosen for very high-pressure or structural needs, while S31254 is chosen when maximum corrosion resistance and fabricability are needed.
alloy 254 smo Vs Super Duplex S32750
Super duplex alloys have the highest strength (~550–600 MPa YS) and very high pitting resistance (PREn ~40–45). They outperform S31254 in both strength and corrosion. However, S31254 offers austenitic ease-of-use: it has higher ductility and is less sensitive to improper welding (no need to carefully balance ferrite).For demanding systems requiring deep draws, complex shapes, or guaranteed toughness, 254 SMO can be the more practical choice, whereas super-duplex is chosen for ultimate strength.
