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Stainless Steel 254 SMO(tm) |
Related Metals: |
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VLX954(tm)
Alloy 254
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Specifications: |
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ASTM A182 (F44)
ASTM A240
ASTM A249
ASTM A269
ASTM A312
ASTM A469
ASTM A813
ASTM A814
UNS S31254 |
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Chemistry Data |
Carbon |
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0.02 max |
Chromium |
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19.5 - 20.5 |
Copper |
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0.5 - 1 |
Iron |
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Balance |
Manganese |
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1 max |
Molybdenum |
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6 - 6.5 |
Nickel |
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17.5 - 18.5 |
Nitrogen |
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0.18 - 0.22 |
Phosphorus |
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0.03 max |
Silicon |
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0.8 max |
Sulphur |
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0.01 max |
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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 |
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Applications |
Petroleum production, saltwater handling, food processing and chemical processing equipment, pulp mill bleach systems, flue gas desulfurization scrubbers and tall oil distillation columns. |
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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. |
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Forming |
Due to its high initial yield strength, this alloy will require greater force than used in other austenitic stainless steels. |
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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. |
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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. |
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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 re |
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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, |
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Annealing |
2100-2200 F (1149-1204 C), followed by a water quench. |
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Hardening |
This alloy does not respond to heat treatment. Hardening can only be achieved through cold reduction. |
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Physical Data |
Density (lb / cu. in.) |
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0.287 |
Specific Gravity |
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7.8 |
Specific Heat (Btu/lb/Deg F - [32-212 Deg F]) |
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0.119 |
Modulus of Elasticity Tension |
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29 |
