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254SMO

Designated as UNS S31254 or DIN W.Nr. 1.4547, 254SMO is an Cr-Ni-Mo alloyed super austenitic stainless steel with deliberate additions of copper and nitrogen content. With high levels of chromium, molybdenum, and nitrogen, 254SMO is especially suited for high-chloride environments and offers chloride resistance superior to Alloy 904L, SS316L, Alloy 20 and Alloy 825. It can be readily welded to other common austenitic stainless steels. The 254 SMO stainless steel provides outstanding resistance to pitting corrosion, crevice corrosion, as well as stress-corrosion cracking. It is widely used in seawater handling & desalination equipment, pulp and paper industry, oil refinery plant, chemical processing equipment, and food processing equipment, etc.

254SMO elbow 2"x4mm, ASTM A403 WPS31254.

254SMO elbow 2″x4mm, ASTM A403 WPS31254.

1. Chemical Composition of 254SMO

ElementWrought Castings
Carbon≤0.020≤0.025
Chromium19.5-20.519.5-20.5
Nickel 17.5-18.517.5-19.5
Molybdenum6.0-6.56.0-7.0
Nitrogen0.18-0.220.180-0.240
Copper0.50-1.000.50-1.00
Sulfur≤0.010≤0.010
Phosphorus≤0.030≤0.045
Silicon≤0.80≤1.00
Manganese≤1.00≤1.20
IronBalanceBalance

2. Mechanical Properties of 254 SMO

W/N flanges 300# 3" SCH80, ASTM A182 F44(S31254).

W/N flanges 300# 3″ SCH80, ASTM A182 F44(S31254).

Tensile Strength, min.Yield Strength, min.Elongation, min. Hardness, max.
ksiMpaksiMpa%Brinell HBWRockwell
95655453103522396 HRBW
*The values are furnished on the basis of 254SMO plates.

3. Physical Properties of 254 SMO

Modulus ElasticityThermal ConductivitySpecific HeatDensityMelting RangeM.P
106psiBtu/hft°FBtu/lb°Fg/cm3°C-
297.50.1208.11320-13901.003
*All values are measured at room temperature.

4. Product Forms and Relative Standards

A floating ball valve with ASTM A182 F44 body

A floating ball valve with ASTM A182 F44 body, Maersk Oil, Kazakhstan.

Product FormStandard
Plate, Sheet, StripASTM A240,A480
Bar, BilletASTM A276, A479
Seamless and Welded PipeASTM A312, A358, A409, A813, A814
Seamless and Welded TubeASTM A249, A269, A270
Fittings, ForgingsASTM A182, A403, A473
Bolting, NutsASTM A193, A194
CastingASTM A351, A743, A744
*254SMO is designated differently in different product forms: for wrought pipe fittings, it is ASTM A403 WPS31254; for forgings, it is ASTM A182 F44; for castings, it should be CK3MCuN or UNS J93254.

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Austenitic Stainless Steel

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