Hastelloy C276 Pipe | INCONEL® Alloy C-276

C-276 Alloy Nickel Pipe

UNS N10276 / W.Nr. 2.4819

COMMON TRADE NAMES: INCONEL® Alloy C-276, Hastelloy® C-276, SMC276®

Alloy C-276 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® C-276 and the universal designation UNS N10276. C-276 is often used in extremely corrosive environments that other alloys cannot withstand.

Characteristics

Corrosion Resistance

Alloy C-276 is one of the most corrosion-resistant alloys available. The nickel, chromium, and molybdenum found in Alloy C-276 form a powerful triple threat against almost all forms of corrosion. C-276 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. C-276 has excellent oxidation resistance at elevated temperatures up to 1900°F (1038°C). C-276 is not recommended for extreme oxidizing environments such as that presented by concentrated hot nitric acid.

Elevated Temperature Resistance

C-276 resists oxidation at temperatures up to 1900°F (1038°C).

Mechanical Properties

In the annealed condition, C-276 has a yield strength of 41 ksi (345 MPa). However, higher strength may be achieved through the pilger process. C-276 maintains excellent toughness at cryogenic temperatures.

Heat Treatment

C-276 cannot be strengthened by heat treating. C-276 is typically solution annealed at 2050°F (1121°C) followed by rapid cooling.

Workability

C-276 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

C-276 is a workhorse in the chemical processing industry and is used extensively in the oil and gas industry, owing to its corrosion resistance in a wide range of aggressive substances. In upstream oil and gas, C-276 is used as tubing, casing, or liners in 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. C-276 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 C-276 seamless pipe & tube for use in multiple industries and applications, including:

Severely corrosive oil and gas wells containing CO2 , H2S, S0 (elemental sulfur), and chlorides

Chemical Processing
Paper & Pulp Industry
Base Pipe for Sand Screens
Tubing, Casing, & Liners
Pipe for VIT
Swell Packers
Pharmaceuticals
Super Conductors
Geothermal

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Chemical Composition

C	Cr	Ni	Fe	Mn	Si	Mo	Co	P	S	V	W
≤ 0.02	14.5 - 16.5	BAL	4 - 7	≤ 1	≤ 0.08	15 - 17	≤ 2.5	≤ 0.03	≤ 0.03	≤ 0.35	3 - 4.5

(mass %)

Specifications

ASTM B622, ASME SB622

Specified Mechanical Properties in Annealed Condition

Per ASTM B622

Tensile Strength	Yield Strength	Elongation
minimum, ksi	minimum, ksi	minimum, %
100	41	40

*Higher strength properties can be provided in the cold hardened condition.

Typical Physical Properties

		70°F	200°F	400°F	600°F	800°F	1000°F	1200°F
Density	lbs/in³	0.321	-	-	-	-	-	-
Thermal Expansion	X10^-6/°F	-	6.2	6.7	7.1	7.3	7.4	9.6
Elastic Modulus	10³ ksi	29.8	29.1	28.3	27.3	26.4	25.5	22.37
Poisson Ratio	-	0.33	-	-	-	-	-	0.377
Thermal Conductivity	Btu-in/h·ft²·°F	-	77	90	104	117	132	152
Specific Heat	Btu/lb·°F	0.102	-	-	-	-	-	0.14
Yield Strength	ksi	41	40	38	34	33	33	11
Tensile Strength	ksi	100	99	99	94	92	87	44

Manufacturing Process

PROCESS	DESCRIPTION
Steel Making	Electric Arc Furnace followed by Vacuum Oxygen Decarburization (VOD) or Argon Oxygen Decarburization (AOD).
Pipe Making	Conventional Seamless Cold Finished Pipe and Tube Manufacturing Processes.
Heat Treatment	Cannot 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.

Schedule Pipe

Product Capabilities

CRA offers this alloy in:
Seamless Pipe

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