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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)
ASTM A240
ASTM A249
ASTM A269
ASTM A312
ASTM A469
ASTM A813
ASTM A814
UNS S31254

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

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.


Forming

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


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.


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


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

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

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