C276 Schedule Pipe & Tube

Corrosion Resistant Alloys > Alloys > C276 > C276 Schedule Pipe & Tube

Alloy C276

UNS N10276 / W.Nr. 2.4819

COMMON TRADE NAMES: Inconel® Alloy C-276, Hastelloy® C-276

Alloy C276 is a nickel-chromium-molybdenum solid solution strengthened super-alloy with a nominal chemical composition of 57% nickel, 16% chromium, and 16% molybdenum, with additions of iron, tungsten, and cobalt. It is commonly referred to by the tradename Hastelloy® C276 and the universal designation UNS N10276. C276 is often used in extremely corrosive environments that other alloys cannot withstand.

Characteristics

Corrosion Resistance

Alloy C276 is one of the most corrosion-resistant alloys available. The nickel, chromium, and molybdenum found in Alloy C276 form a powerful triple threat against almost all forms of corrosion. C276 has excellent resistance to reducing and oxidizing acids, including sulfuric, hydrochloric, and acetic acids. It also performs well in seawater, chlorides, wet chlorine gas, oxidizing salts, and hypochlorite. The molybdenum and tungsten content protects against various forms of localized corrosion, including pitting, crevice corrosion, and chloride stress corrosion cracking. C276 has excellent oxidation resistance at elevated temperatures up to 1900°F (1038°C). C276 is not recommended for extreme oxidizing environments such as that presented by concentrated hot nitric acid.
Service Temperature

Elevated Temperature Resistance

C276 resists oxidation at temperatures up to 1900°F (1038°C).
Mechanical Properties

Mechanical Properties

In the annealed condition, C276 has a yield strength of 41 ksi (345 MPa). However, higher strength may be achieved through the pilger process. C276 maintains excellent toughness at cryogenic temperatures.

Heat Treatment

C276 cannot be strengthened by heat treating. C276 is typically solution annealed at 2050°F (1121°C) followed by rapid cooling.
Workability

Workability

C276 can be hot worked in the range of 1600°F - 2250°F (870°C - 1230°C). Annealing is recommended after hot working. Cold forming can be performed, however, it has a high work-hardening rate so intermediate anneals may be required.

Applications

C276 is a workhorse in the chemical processing industry, owing to its corrosion resistance in a wide range of aggressive substances. C276 is used in the oilfield for aggressive sour service environments characterized by high levels of H2S, CO2 , and chlorides. It is also used in other industries where harsh environments are encountered, including the pharmaceutical and paper industries. C276 is used for valves in cryogenic service and has been used in superconductors at temperatures as low as -455°F (-271°C).

CRA offers specialty alloy C276 seamless pipe & tube for use in multiple industries and applications, including:

  • Chemical Processing
  • Pharmaceutical Industry
  • Paper & Pulp Industry
  • Oil & Gas
  • Superconductors

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Chemical Composition

CCrNiFeMnSiMoCoPSVW
≤ 0.0214.5 - 16.5BAL4 - 7≤ 1≤ 0.0815 - 17≤ 2.5≤ 0.03≤ 0.03≤ 0.353 - 4.5
(mass %)

Specifications

ASTM B622, ASME SB622

Specified Mechanical Properties in Annealed Condition

Per ASTM B622

Tensile StrengthYield StrengthElongation
minimum, ksiminimum, ksiminimum, %
1004140
*Higher strength properties can be provided in the cold hardened condition.

Typical Physical Properties

  70°F200°F400°F600°F800°F1000°F1200°F
Densitylbs/in30.321------
Thermal ExpansionX10-6/°F-6.26.77.17.37.49.6
Elastic Modulus103 ksi29.829.128.327.326.425.522.37
Poisson Ratio-0.33-----0.377
Thermal ConductivityBtu-in/h·ft2·°F-7790104117132152
Specific HeatBtu/lb·°F0.102-----0.14
Yield Strengthksi41403834333311
Tensile Strengthksi100999994928744

Manufacturing Process

PROCESSDESCRIPTION
Steel MakingElectric Arc Furnace followed by Vacuum Oxygen Decarburization (VOD) or Argon Oxygen Decarburization (AOD).
Pipe MakingConventional Seamless Cold Finished Pipe and Tube Manufacturing Processes.
Heat TreatmentCannot be hardened by heat treatment. May be provided in the annealed or cold hardened condition.

Related Alloys

C276 is part of the Hastelloy® C family of Ni-Cr-Mo alloys. C22 is an evolution of C276 with more chromium and provides more robust general corrosion resistance and better resistance to chloride-induced localized corrosion.

Product Availability

CRA offers this alloy in:
Seamless Pipe & Tube

MIN OD: 2-1/16″ (2.0625″)
MAX OD: 10-3/4″ (10.750”)
THICKNESS: Up to 1.925”
LENGTHS: Up to 70′

Standard & Non-Standard Sizes Available.

Manufactured Material Available as Quickly as 1 Week.

Non-Standard Mill Quantities Accommodated