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Alloy 254 SMo Tubes
Alloy 254 SMo Seamless Tubes
Alloy 254SMo Plates
Alloy 254 SMo Sheets
Alloy 254 SMo Pipes/ 254 smo pipe
Alloy 254 SMo Fittings

1.4547 (UNS S31254 – 254 SMO® – SS2378)

** Nearest equivalent grade.

Product standards

  • Seamless tube and pipe: ASTM A269, A213, A312, NFA 49-217, EN 10216-5
  • Welded tube and pipe: ASTM A249, A269 , A312, A358, A409
  • Fittings: ASTM A182
  • Bar: ASTM A276, A479, EN 10088-3
  • Forged products: ASTM A473


Alloy 254 SMO - 254 Smo Chemical Composition

C Si Mn P S Cr Ni Mo N Cu
≤0.020 ≤0.80 ≤1.00 ≤0.030 ≤0.010 20 18 6.1 0.20 0.7


Alloy 254 SMO - Physical Properties of Alloy 254

Density (Kg.m-3) 8000
Magnetic Permeability <1.05
Young’s Modulus (N/mm2) 200 x 103
Specific Heat 20°C (J.Kg-1.°K-1) 500
Electrical resistance, 20°C (µ.O.m) 0.85
Thermal conductivity, 20°C (W.m-1.°K-1) 13.5

Alloy 254 SMO - Applications of Alloy 254

Chemical Process Industry:
Urea Production, Organic and Fatty Acids, High halide concentrations
Marine Industry and Shipbuilding:
Piping, Pumps, Valves, Heat exchangers
Oil and Gas Industry:
Heat exchangers, Piping, Valves, Pumps
Pulp and Paper Industry:
Bleach plant, vats, drums, press rolls, piping
Power Industry:
Flue gas scrubbers
Desalination plant:
Piping, Condensers


Alloy 254 SMO - Alloy 254 Features

  • High strength compared to 316L and 317L austenitic stainless steels
  • Excellent ductility and impact strength at both ambient and sub-zero temperatures
  • Non-magnetic
  • Higher resistance to abrasion, erosion and cavitation erosion than 316 and 317 stainless
  • Listed in MR-01-75 for sour service oilfield applications

Alloy 254 SMO - Alloy Comparisons

Alloy Comparisons S20910 S32205 N05500 S31254 FERRALIUM 255-SD50
(0.2% Proof Strength, N/mm2) 420 510 690 325 610

Corrosion Rate (mm.y-1)Seawater

<0.01 <0.01 <0.18 <0.01 <0.01

Corrosion Rate (mm.y-1)10% sulphuric acid at 80°C

0.7 0.4 0.1 <0.15 <0.15

Corrosion Rate (mm.y-1) Boiling 50% nitric acid

0.18 <0.15 0.15 <0.15 <0.15
Wear Properties related to Hardness (HRC) RC27 RC25 RC20 RC27 RC27


Alloy 254 SMO - KEY Features of Alloy 254

  • Resistant to crevice corrosion in seawater
  • Excellent corrosion resistance in seawater and concentrated halide environments
  • High resistance to stress corrosion cracking
  • Good resistance to erosion corrosion
  • Excellent ductility and impact strength at both ambient and sub-zero temperatures
  • Low magnetic permeability

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