Stainless steel capillary 254. Duplex stainless steel tube 254 SMO
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254 SMO (UNS S31254) is an austenitic stainless steel which due to its high molybdenum content possesses very high resistance to pitting and crevice corrosion. The metal was developed for use in halide-containing environments such as seawater. 254 SMO also shows good resistance to uniform corrosion and is superior to conventional stainless steels especially in acids containing halides.
Chemical composition:
Item Brand | Ni | Cr | Mo | Cu | N | C | Mn | Si | P | S | |||
254SMo | 17.5- 18.5 | 19.5- 20.5 | 6.0-6.5 | 0.5- 1.0 | 0.18- 0.22 | ≤0.02 | ≤1.0 | ≤0.8 | ≤0.03 | ≤0.01 | |||
Standard | |||||||||||||
Sheet/Plate | Round bar/Wire | Pipe | Tube | ||||||||||
ASTM A240 | ASTM A276 ASTM A479 | ASTM A269 ASTM A213 ASTM A312 | ASTM A249 ASTM A269 ASTM A312 ASTM A358 ASTM A409 | ||||||||||
254SMO Physical properties :
Density | 8.0 g/cm3 |
Melting point | 1320-1390 °C |
254SMO minimum mechanical properties in the room temperature:
Status | Tensile strength | Yield strength | Elongation A5 % |
254 SMO | 650 | 300 | 35 |
254 SMO is used in the following applications:
1)Equipment for handling of seawater, such as, seawater cooling, cooling water pipes, ballast water systems, firefighting systems etc.
2) Hydraulic and instrumention tubing
3) Equipment in pulp bleaching plants
4) Components in gas cleaning systems
5) Tanks and pipelines for chemicals with high halide contents
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