Hastelloy® alloy C-276

UNS N10276
W.Nr 2.4819

Applications

Springs, heat exchangers bellows and seals.

Description

Hastelloy® alloy C-276 is a Nickel-Molybdenum-Chromium corrosion resistant alloy. The alloy is resistant to pitting, crevice corrosion, and stress corrosion cracking. Hastelloy® C-276 is hardened only by cold-working. Hastelloy® C-276 can operate from cryogenic temperatures up to 750°F (400°C).

Industries Supplied

Chemical Processing, Pollution Control, Pulp and Paper Production and Waste Treatment.

Nominal Composition

Mo: 15.0 - 17.0
Cr: 14.5 - 16.5
Fe: 4.0 - 7.0
W: 3.0 - 4.5
Co: 2.5 max
C: 0.010 max
Si: 0.08 max
Mn: 1.0 max 
V: 0.35 max
P: 0.04 max
S: 0.03 max 
Ni: Balance

Physical Properties

Density: 0.321 lb/in3, (8.89 g/cm3)

Modulus of Elasticity (E): 
At 70°F (20°C): 29.7 x 103 ksi (205 GPa)

Modulus of Rigidity (G): 
At 70°F (20°C): 11.5 x 103 ksi (79.0 GPa)

Coefficient of Expansion:
6.78 µin/in.-°F (70°F to 600°F)
12.2 µm/m-°C (20°C to 300°C)

Electrical Resistivity: 51 µΩ.in, (130 µΩ.cm)

Thermal Conductivity: 68.0 Btu-in/ft2hr-°F, (9.80 W/m-K)

Applicable Specifications

Strip and Foil: ASTM B575, ASTM B906, ISO 6208, DIN 17750

Typical Mechanical Properties

  • Annealed
    • Heat Treatment: 2050°F (1121°C)
    • Tensile Strength: 120 - 160 ksi (830 - 1100 MPa)
    • Suggested Operating Conditions: -300°F to 750°F (-184°C to 400°C)
    •  
    • Spring Temper
    • Tensile Strength: 200 - 240 ksi (1380 - 1655 MPa)
    • Suggested Operating Conditions: -300°F to 750°F (-184°C to 400°C)

  • Hastelloy® is a registered trademark of Haynes International, Inc.

    For further information Contact:

    Email: stripinfo@elgiloy.com
    Phone: 1 888 843 2350 
    Elgiloy Specialty Metals - Strip Products
    1565 Fleetwood Dr.
    Elgin, IL 60123 USA 

    Additional Information Regarding Hastelloy® C-276

  • Another widely used Nickel-Molybdenum-Chromium alloy that is used in several different industries is Hastelloy® C276. Much like its counterparts, C276 displays strong resistance to stress corrosion cracking, crevice corrosion, and pitting. However, unlike many of its counterparts, C-276 is only hardened by cold-working. This allows it to be used under very specific circumstances for the engineers and maintenance mechanics that utilize it.

    Discovered close to fifty years ago, Hastelloy® C-276 has proven over time to be one of the top alloys in the market in terms of chemical corrosion resistance. The chemical processing industry has been using the alloy for years with magnificent results, and continues to use it to this day. It was first manufactured in order to solve problems that other alloys had with welding. Due to its low content of Carbon and Silicon, it is easily weldable to fit in almost any machinery that needs to have high levels of corrosion resistance.

    Most nickel alloys are easy to form and weld, and show excellent resistance to stress corrosion cracking in a variety of chloride solutions. This is an area that stainless steel fails over and over again. However, with C-276, the levels of Molybdenum and Chromium allow it to maintain its integrity in oxidizing and non-oxidizing acids. Furthermore, when chlorides are present, C276 is able to resist pitting and crevice attack. Lastly, this alloy is extremely stress corrosion cracking resistant in oilfield environments which makes it invaluable in that particular industry.

    Chemical processing industries tend to use Hastelloy® C-276 inside their columns, heat exchangers and reactors, due to the toxicity of the chemicals that are housed and pass through them. Among the many chemicals that C-276 can withstand include, a variety of acids, seawater, and chlorine solutions. It also maintains its integrity after it has been welded, so it can be shaped to fit in any area. Versatility is important when it comes to putting together chemical processing units, and the Hastelloy® C276 strip absolutely fits that criteria.

    Another reason why Hastelloy® C-276 strip is trusted by the chemical processing industry is the way that it is created. The alloy is heat-treated in temperatures up to 2050 degrees Fahrenheit and is then rapidly quenched. This process, combined with the elements contained inside the alloy, is what allows it to be versatile, while still holding up under extreme conditions. It can be welded using almost all typical welding methods, although it is unadvisable to use certain methods once the alloy has been exposed to corrosive elements.

    Chemical processing is not the only industry that utilizes the amazing properties that Hastelloy® C-276 provides. Pulp and paper production for example is in need of an alloy that can withstand the chemicals used for the treatment of certain types of paper. Another area is pollution control and waste treatment, which, as you can imagine, produces a high level of corrosive chemicals that can wear down any alloy that is not specifically designed to handle it. Hastelloy® C276 strip has been proven over a long period of time that it can handle these circumstances, which is why it is the go-to alloy for any industry that utilizes corrosive chemicals on a daily basis.