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 |