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Alloy 254 Smo Composition

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Stainless Steel 254 SMO(tm)


Related Metals:
  • VLX954(tm)
  • Alloy 254

Specifications:
  • ASTM A182 (F44)
  • ams 5657
  • ASTM A240
  • ASTM A249
  • ASTM A269
  • ASTM A312
  • ASTM A469
  • ASTM A813
  • ASTM A814
  • UNS S31254

ChemistryData
  • 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

General Information 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 b
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.
Corrosion Resistance 254-SMO is highly resistant to pitting, crevice and stress corrosion cracking in a wide variety of environments when compared to 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.
Heat Treatment

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 re

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,
Annealing

Cold Work is Restricted Only By this Alloys High Initial Yield Strength. the Alloy is Not Favored for Cold Working But Can Be Moderately Formed.
Aging 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 : 74
  • Yield Strength : 24

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


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