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254 SMO (S31254)


The following specifications cover Stainless Steel 254 SMO(tm)

  • ASTM A182 (F44)
  • ASTM A240
  • ASTM A249
  • ASTM A269
  • ASTM A312
  • ASTM A469
  • ASTM A813
  • ASTM A814
  • UNS S31254

Property Results

Related Metals:

  • VLX954(tm)
  • Alloy 254
  • 6 Moly


Chemistry Data :

Carbon 0.02 max
Chromium 19.5 – 20.5
Copper 0.5 – 1
Iron Balance
Manganese 1 max
Molybdenum 6 – 6.5
Nickel 17.5 – 18.5
Nitrogen 0.18 – 0.22
Phosphorus 0.03 max
Silicon 0.8 max
Sulphur 0.01 max

Principal Design Features This is a very high end austenitic stainless steel that combines impact toughness resistance to chloride stress corrosion cracking, pitting and crevice corrosion with strength nearly twice that of 300 series stainless steels. In some applications it has been found to be a more cost effective substitute for high nickel and titanium alloys.

Applications Petroleum production, saltwater handling, food processing and chemical processing equipment, pulp mill bleach systems, flue gas desulfurization scrubbers and tall oil distillation columns.

Machinability An extremely high work hardening rate combined with a total lack of sulfur make 254-SMO very tough to machine. Sharp tools, positive feeds, overpowered machine tools, ample lubrication and slow speeds generally offer the best results.

Forming Due to its high initial yield strength, this alloy will require greater force than used in other austenitic stainless steels.

Welding Welding without filler material results in poor strength properties. Recommended filler metals include AWS A5.14 ERNiCrMo-3, and alloy 625. Electrodes should comply with AWS A5.11 ENiCrMo-12.

Hot Working While cold forming is recommended wherever feasible, forging, upsetting and other operations can be performed at 1800-2100 F. Temperatures above this range will cause scaling and a reduction in the workability of the material. Post-process annealing is required to re-attain maximum corrosion resistant properties.

Cold Working Most common cold work methods are successful with this alloy. It should be understood however that the material will be more difficult to work than other austenitic stainless steels due its high work hardening rate. The resulting hardening will, however, produce increases in strength and toughness which may be of value in the finished product.

Annealing 2100-2200 F (1149-1204 C), followed by a water quench.

Hardening This alloy does not respond to heat treatment. Hardening can only be achieved through cold reduction.

Physical Data :

Density (lb / cu. in.) 0.287
Specific Gravity 7.8
Specific Heat (Btu/lb/Deg F – [32-212 Deg F]) 0.119
Modulus of Elasticity Tension 29

Mechanical Data :

Form Sheet
Condition Test Specimen Annealed
Temper 70
Tensile Strength 95
Yield Strength 45

Form Sheet
Condition Test Specimen Annealed
Temper 120
Tensile Strength 90
Yield Strength 40

Form Sheet
Condition Test Specimen Annealed
Temper 200
Tensile Strength 88
Yield Strength 35

Form Sheet
Condition Test Specimen Annealed
Temper 300
Tensile Strength 86
Yield Strength 30

Form Sheet
Condition Test Specimen Annealed
Temper 400
Tensile Strength 80
Yield Strength 26

Form Sheet
Condition Test Specimen Annealed
Temper 600
Tensile Strength 75
Yield Strength 24

Form Sheet
Condition Test Specimen Annealed
Temper 750
Tensile Strength 74
Yield Strength 23



Limitation of Liability and Disclaimer of Warranty: In no event will South Coast Industrial Metals or any of its affiliates be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. South Coast Industrial Metals, Inc. assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.