Item # 255-FORGING-BAR/PANCAKE, Ferralium® alloy 255 on High Performance Alloys, Inc.


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	Item # 255-FORGING-BAR/PANCAKE Ferralium® alloy 255

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Ferralium® alloy 255
Ferralium® alloy 255 (UNS S32550) Fe 62, Cr 25.5, Ni 5.5, Mo 3.4 Cu 2.0, Mn 1.6, Si 0.7, N 0.2

Industrial and Marine Applications Continue Growing Rapidly for Alloy 255

Alloy 255 is finding many cost effective applications in the chemical, marine, metallurgical, municipal sanitation, plastics, oil and gas, petrochemical, pollution control, wet phosphoric acid, paper making and metalworking industries.

Called "super" because it is more alloyed than ordinary stainless steels and has superior corrosion resistance, alloy 255 is being used in areas where conventional stainless' are inadequate or, at best marginal. One good example s in the paper industry which was hit with an epidemic of corrosion problems when environmental laws forced recycling of process liquids In closed systems, chemicals such as chlorides can build up to highly corrosive concentrations over time. Paper makers have found that ordinary stainless equipment, which had previously given good service, was no longer adequate for many applications.

Si 0.7, N 0.2 Duplex alloy with a high strength to weight ratio, with superior abrasion and cavitation resistance. Resistance to chloride SCC, as well as crevice corrosion and pitting. Good ductility with a high fatigue strength in marine applications. Twice the yield strength of Alloy 20, and stronger than Duplex 2205. An excellent 40 °C critical pitting temperature (ASTM G48-Method A), twice that of Alloy 2205.

Specifications · Physical · Mechanical · Nominal Chemistry · General Resistance · Characteristics · Applications · Features

Specifications

Type		Forging

Alloy		255

Physical

Density		0.282 lb/in³

Electrical Resistivity		473 ohm/cir-mil-ft

Thermal Expansion (x 10^-6 in/in/Deg F)		6.7 (68 - 600 F)

Mechanical

Mechanical Type		Annealed

Tensile Strength		124 ksi

Yield Strength		94 ksi

Elongation		25%

Hardness		C21

Nominal Chemistry

Ni		5

Fe		bal.

Cr		25

Mo		3.4

Cu		2

Mn		1.6

N		0.2

Si		0.7

C		0.04 max

General Resistance

General Resistance		Corrosion Strength

UNS		S32550

Werkstof		1.4507

Sheet/Plate USA		A240

Bar/Rod USA		A479

Weld Electrode		E2553

Characteristics

Physical Properties

Density 0.282 lb/in
Specific Gravity 7.81
Thermal Expansion Coefficient (68 °F to 600 °F) 6.7 X 10^-6 in/in/°F
Thermal Conductivity (68 °F) 105 Btu/sqr ft/hr/°F/in
Electrical Resistivity (68 °F) 473 Ohms/cir mil ft
Dynamic Modulus of Elasticity 30.5x10⁶ psi

Applications

Alloy 255 is a cost effective alternative to materials such as the nickel alloys, 20 type alloys, brass and bronze. Marine environments have long been the domain of admiralty bronze. Alloy 255 is replacing admiralty bronze, and the nickel alloys, in offshore platforms, deck hardware, rudders and shafting.

Alloy 255 is also making inroads in "borderline" corrosion applications where the nickel alloys and high performance alloys have been used but may not have been absolutely necessary. In some instances, it has even been used to replace high performance Ni-Cr-Mo-F-Cu alloys in the phosphoric acid industry.

Valves, pumps, shafts, marine environments, Applications in down-hole, waste water, polycarbonate production, and demineralized water production.

Features

Superior Corrosion Resistance
Pitting
Crevice Corrosion
Chloride Stress Corrosion Cracking
General Corrosion In Many Environments
Good Ductility
High Strength-to-Weight Ratio
High Fatigue Strength In Marine Environments
Superior Abrasion and Cavitation Erosion Resistance
High Mechanical Strength - (over twice the yield strength of austenitic stainless steels).
Good Fabricability

Item # 255-FORGING-BAR/PANCAKE Ferralium® alloy 255

Type

Alloy

Density

Electrical Resistivity

Thermal Expansion (x 10-6 in/in/Deg F)

Mechanical Type

Tensile Strength

Yield Strength

Elongation

Hardness

Ni

Fe

Cr

Mo

Cu

Mn

N

Si

C

General Resistance

UNS

Werkstof

Sheet/Plate USA

Bar/Rod USA

Weld Electrode

Thermal Expansion (x 10^-6 in/in/Deg F)