Alloy C276, Alloy C-276, Hastelloy C-276, 2.4819, N10276

Grade	Code	UNS	Nickel Alloys
C-276	2.4819	N10276	Nickel Alloys

Nickel Alloy Properties

Alloy C-276 is one of the most corrosion-resistant nickel-based alloys used in modern process industries. Its nickel-molybdenum-chromium base, strengthened by a tungsten addition, enables high performance in a wide range of aggressive chemical environments, particularly oxidizing and reducing acids. In the solution-annealed condition, it provides exceptional resistance to chloride-induced stress corrosion cracking, while its high molybdenum and chromium contents improve resistance to pitting and crevice corrosion. For this reason, Alloy C-276 is widely selected for chemical processing, petrochemical service, acid production, flue gas desulfurization systems and chloride-containing process environments.

Chemical Analysis (Alloy C-276)

Ni %	Cr %	C %	Mo %	Mn %	Si %	Co %	V %	W %	Fe %	P %	S %
Balance	14.50 – 16.50	0.01 max.	15.00 – 17.00	1.00 max.	0.08 max.	2.50 max.	0.35 max.	3.00 – 4.50	4.00 – 7.00	0.04 max.	0.03 max.

Mechanical Properties (Solution Annealed)

Product Form	Rp0.2, MPa	Rm, MPa	Elongation [%]	Hardness [HRB]	Density [g/cm³]
Plate/Sheet ≤ 5 mm	≥ 310	≥ 730	≥ 30	≤ 100 HRB	8.90
Plate/Sheet 5–25 mm	≥ 280	≥ 700	≥ 25	≤ 100 HRB	8.90
Round Bar ≤ 100 mm	≥ 280	≥ 730	≥ 30	≤ 100 HRB	8.90
Tube/Seamless Tube	≥ 283	≥ 690	≥ 40	≤ 100 HRB	8.90

Application Area

Sector	Products
Chemical Processing	Reactors, heat exchangers, process piping
Petrochemical and Refinery	Acid process equipment, valve and pump components, transfer pipelines
Flue Gas Desulfurization / FGD / Environmental Technologies	Scrubber systems, ducting equipment, stack liners
Pharmaceutical and Sensitive Process Industries	Process reactors, corrosion-resistant process piping, flanges and fittings
Pulp and Paper Industry	Digesters, bleaching tanks, agitator components
Oil & Gas / Sour Gas	Sour gas equipment, acid gas lines, wellhead and connection components
Seawater / Offshore	Seawater piping systems, brine equipment, flanges and fittings
Industrial Waste and Treatment Plants	Evaporators, corrosive waste tanks, waste transfer piping

Description

Alloy C-276 can retain a high level of corrosion resistance after welding thanks to its low carbon and low silicon contents, and it also offers good weldability and formability. It can be welded by common methods such as TIG/GTAW, MIG/GMAW, SMAW and plasma welding, and in many applications it can be used without post-weld heat treatment. During cold forming it may work-harden rapidly, so intermediate annealing may be required after severe deformation; hot forming is generally performed in the 950–1,200 °C range. C-276 should be regarded primarily as a corrosion-resistant alloy for aggressive chemical and chloride-bearing environments rather than as a dedicated high-temperature alloy.

Specification

Alloy C-276, Hastelloy C-276, Inconel alloy C-276, UNS N10276, W.Nr. 2.4819, NiMo16Cr15W

Standards

Product Form	ASTM	AMS	ASME
Round Bar	ASTM B574	AMS 5750	ASME SB574
Plate / Sheet / Strip	ASTM B575	AMS 5530H	ASME SB575
Seamless Pipe / Seamless Tube	ASTM B622 / ASTM B829	—	ASME SB622
Welded Pipe	ASTM B619 / B619M / ASTM B775	—	ASME SB619
Welded Tube	ASTM B626 / ASTM B751	—	ASME SB626
Fittings	ASTM B366	—	ASME SB366
Forgings / Flanges	ASTM B564	—	ASME SB564