Nickel - Chromium - Iron Alloy Bellows Materials - Bellows Systems

Alloy 825 (UNS: N08825)

Bellows Materials Alloy 825
Trade Name Inconel 825
Description A nickel-iron-chromium-molybdenum-copper alloy
Application Notes This alloy has high levels of chromium, nickel, copper and molybdenum to provide excellent corrosion resistance to both moderately oxidizing and moderately reducing environments. Far superior when compared to the standard stainless steels.
UNS N08825
Specifications ASTM B424, ASME SB-424, AMS 5542

Material Properties

Poisson’s Ratio, ν 0.31
Youngs Modulus, E psi 28000000

Other Comments

As an austenitic, nickel-base alloy, the material is ductile over a wide range of temperatures from cryogenic to well in excess of 1000°F (538°C).

Inconel 903 (UNS: N09903)

Bellows Materials Inconel 903
Description An agehardenable nickel-iron-cobalt alloy whose outstanding characteristics are a constant low coefficient of thermal expansion, a constant modulus of elasticity, and high strength.
UNS N09903

Material Properties

Density, ρ, lbs/in^3 0.298
Youngs Modulus, E psi 28000000
Melting Point, ˚F 2405-2539

Incoloy 800 (UNS: N08800)

Bellows Materials Incoloy 800
Description A nickel-iron-chromium alloy with good strength and resistance to oxidation at elevated temperatures.
Application Notes The alloy in addition to its excellent general corrosion resistance is also highly resistant to chloride stress corrosion cracking.
Industry Uses /Products Food process equiqmpent, furnace equipment, tubes and manifolds
UNS N08800
Specifications ASTM B409, ASME SB-409, AMS 5871

Material Properties

Density, ρ, lbs/in^3 0.294
Poisson’s Ratio, ν 0.31
Youngs Modulus, E psi 28000000

Chemical Compostion, %

Iron, Fe 39.5
Nickel, Ni 30-35
Chromium, Cr 19.0-23.0

Alloy 800H (UNS: N08810)

Bellows Materials Alloy 800H
Trade Name Incoloy 800H
Description A nickel-chromium -iron alloy having similar basic composition as Incoloy 800, with significantly higher creep rupture strength.
Application Notes The higher strength results from close control of carbon, aluminum and titanium contents in conjunction with a high temp anneal. The 800H modification was to control carbon (0.05 to 0.10%) and grain size to (>ASTM 5) to optimize stress rupture properties. Incoloy 800 H has further modifications to the combined titanium and aluminum levels (0.85 to 1.2%) to ensure optimum high temperature properties. The alloy is usually dual certified and combines the properties of both forms. It has excellent resistance to carburization, oxidation and nitriding atmospheres. 800HT will not become embrittled even after long periods of usage in the 1200-1600 deg F range where many stainless steels become brittle. Excellent cold forming characteristics typically associated with the nickel-chromium alloys are exhibited with 800HT. When cold formed extensively the grain size produces a visibly undulated surface called “orange peel”. 800HT can be welded by the common techniques used on stainless steels.
Industry Uses /Products Typical applications include ethylene pyrolysis, hydrocarbon cracking, cracking furnaces for vinyl chloride, diphenol and acetic acid. The alloy is also used for components exposed to corrosive attack from 1100 to 1800 deg F.
UNS N08810
Specifications ASTM B409, ASME SB-409, AMS 5871

Material Properties

Density, ρ, lbs/in^3 0.287

Chemical Compostion, %

Iron, Fe 39.5
Nickel, Ni 30-35
Chromium, Cr 19.0-23.0

Alloy 800HT (UNS: N08811)

Bellows Materials Alloy 800HT
Trade Name Incoloy 800HT
UNS N08811
Specifications AMS 5542

Material Properties

Density, ρ, lbs/in^3 0.287

Chemical Compostion, %

Iron, Fe 39.5
Nickel, Ni 30.0-35.0
Chromium, Cr 19.0-23.0

Alloy X (UNS: N06002)

Bellows Materials Alloy X
Trade Name Hastelloy X
Description A nickel-chromium-iron-molybdenum alloy that possesses an exceptional combination of oxidation resistance, formability and high temperature strength.
Application Notes It is also exceptionally resistant to stress-corrosion cracking in petrochemical applications. Alloy X exhibits good ductility after prolonged exposure at temperatures of 1200, 1400, 1600 °F for 16,000 hours. It has excellent formability and welding characteristics.
Industry Uses /Products Furnace Equipment, Chemical Process, Aircrract and Gas Turbine Combustion Components
UNS N06002
Specifications ASTM B435, AMS%%36

Material Properties

Density, ρ, lbs/in^3 0.297
Yield Strength, Sy, Psi 35000
Tensile Strength, Su, Psi 95000
Elongation % 35
Youngs Modulus, E psi 29700000
Coeff. Thermal Expansion, in/in/˚F 0.0000077
Melting Point, ˚F 2470

Chemical Compostion, %

Iron, Fe 18
Nickel, Ni 47
Molybdenum, Mo 9
Chromium, Cr 22
Manganese, Mg 1
Cobalt 1.5
Tungsten, T 0.6