Hastelloy C-276 (UNS N10276/2.4819)

Hastelloy C-276 (UNS N10276/2.4819) is a nickel-molybdenum-chromium superalloy with an addition of tungsten designed to have excellent corrosion resistance in a wide range of severe environments. The high nickel and molybdenum contents make the nickel steel alloy especially resistant to pitting and crevice corrosion in reducing environments while chromium conveys resistance to oxidizing media. The low carbon content minimizes carbide precipitation during welding to maintain corrosion resistance in as-welded structures. This nickel alloy is resistant to the formation of grain boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process application in an as welded condition.

Although there are several variations of the Hastelloy nickel alloys, Hastelloy C-276 is by far the most widely used.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
Hastelloy C-276	NS3304	–	Hastelloy C-276	N10276	NiMo15Cr15W	2.4819	–	NA 45	–	–

Chemical Composition, %

Alloy

Hastelloy C-276

≤0.01

≤0.08

≤1.00

≤0.04

≤0.03

14.5-16.5

Bal

≤2.5

15.0-17.0

3.0-4.5

≤0.35

4.0-7.0

Typical Physical and Mechanical Properties (RT, Solution annealed)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	ELongation, %	Hardness, HB
8.89	1325-1370	760	363	62	–

Available Products and Specifications

Rod, Bar, Wire and Forgings	ASTM B462, ASME SB462, ASTM B564, ASME SB564, DIN 17752/17753/17754, ISO 9723/9724/9725 DIN 17752, ISO 9723
Plate, Sheet and Strip	ASTM B575, ASME SB575, ASTM B906, ASME SB906, DIN 17750, ISO 6208
Pipe and Tube	ASTM B622, ASME SB622, ASTM B619, ASME SB619, ASTM B626, ASME SB626, ASTM B751, ASME SB751, ASTM B775, ASME SB775, DIN 17751, ISO 6207
Welding Product	AWS A5.14 ERNiCrMo-4, ASME Ⅱ SFA-5.14 ERNiCrMo-4, ASME Ⅸ F-No.43
Others	ASTM B366, ASME SB366, DIN17744

Features

Excellent corrosion resistance in reducing environments
Exceptional resistance to strong solutions of oxidizing salts, such as ferric and cupric chlorides
High nickel and molybdenum contents providing good corrosion resistance in reducing environments
Low carbon content which minimizes grain-boundary carbide precipitation during welding to maintain resistance to corrosion in heat-affected zones of welded joints
Resistance to localized corrosion such as pitting and stress-corrosion cracking
One of few materials to withstand the corrosive effects of wet chlorine gas, hypochlorite and chlorine dioxide

Applications

Pollution control stack liners, ducts, dampers, scrubbers, stack-gas reheaters, fans and fan housings
Flue gas desulfurization systems
Chemical processing components like heat exchangers, reaction vessels, evaporators, and transfer piping
Sour gas wells
Pulp and paper production, Waste treatment
Pharmaceutical and food processing equipment