Hastelloy C4 (UNS: N06455)

Bellows Materials Hastelloy C4
Trade Name Hastelloy C4
Description A Nickel-Chromium-Molybdenum alloy with outstanding high temperature stability.
Application Notes It has high ductility and corrosion resistance. It’s high temperature resistance up to 1900 °F (1038 °C) makes it suitable for most chemical process application in the “as” welded condition. Resistant to chloride induced stress corrosion cracking
Industry Uses /Products Chemical processing equipment, nuclear fuel processing
UNS N06455
Specifications ASTM B

Material Properties

Density, ρ, lbs/in^3 0.312
Yield Strength, Sy, Psi 40000
Tensile Strength, Su, Psi 100000
Elongation % 40
Youngs Modulus, E psi 30800000
Coeff. Thermal Expansion, in/in/˚F 0.0000108

Alloy C22 (UNS: N06022)

Bellows Materials Alloy C22
Trade Name Hastelloy C22
Description A nickel-chromium-molybdenum alloy with good resistance to both oxidizing and non-oxidizing chemicals, and protection from pitting, crevice attack, and stress corrosion cracking.
Application Notes Its high chromium content provides much higher resistance to oxidizing media than the family standard, C-276 alloy, and imparts exceptional resistance to chloride-induced pitting, to which the stainless steels are prone.
Industry Uses /Products Typical chemical process industry (CPI) applications include reactors, heat exchangers, and columns.
UNS N06022

Chemical Compostion, %

Nickel, Ni 56
Molybdenum, Mo 13
Chromium, Cr 22

Alloy C276(UNS: N10276)

Bellows Materials Alloy C276
Trade Name INCONEL® alloy C-276, Hastelloy® C-276 alloy
Description A nickel-molybdenum-chromium-tungsten alloy with excellent corrosion resistance and good fabricability.
Application Notes Nickel Alloy C-276 is a good candidate for most chemical and petrochemical processing applications in the as-welded condition.It has excellent resistance to reducing acids, sulfuric acid, hydrochloric acid, brine solutions, oxidizing chlorides, and hot seawater. Hastelloy C-276 is also one of the few materials resistant to wet chlorine gas, hypochlorite and chlorine dioxide. This particular nickel alloy has exceptional resistance to crevice corrosion and stress corrosion cracking, as well as chloride pitting. It’s low carbon content minimizes carbide precipitation during welding preserves its excellent resistance to corrosion during welding.
BSI Products Bellows
UNS N10276
Specifications ASTM B, ASME SB-

Material Properties

Density, ρ, lbs/in^3 0.321

Chemical Compostion, %

Iron, Fe 5
Nickel, Ni 57
Molybdenum, Mo 16
Chromium, Cr 16
Manganese, Mg 1
Cobalt 2.5
Tungsten, T 4
Copper, Cu 0.5

Other Comments

While it does have good oxidation resistance up to 1800°F, Hastelloy alloy C-276 is generally not recommended for elevated temperature service.