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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 : [top]

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

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