UNS Number N10276

Hastelloy C-276 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.

Available Forms of Hastelloy C-276 at Rooplaxmi Steels:

•  Bar
•  Sheet
•  Plate
•  Pipe & Tube (welded and seamless)
•  Pipe Fittings
•  Wire

Characteristics of Hastelloy C-276:

•  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

Hastelloy C-276 Chemical Composition, %:

Ni	Mo	Cr	Fe	W	Co	Mn	C
Balance	15.0-17.0	14.5-16.5	4.0-7.0	3.0-4.5	2.5 max	1.0 max	0.01 max

V	P	S	Ci
0.35 max	0.04 max	0.03 max	0.08 max

 

Application of Hastelloy C-276:

•  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

Machining and Fabrication with Hastelloy C-276:

Hastelloy C-276 alloy can be forged, hot-upset and impact extruded. Although the alloy tends to work-harden, you can have it successfully spun, deep-drawn, press formed or punched. All of the common methods of welding can be used, although the oxyacetylene and submerged arc processes are not recommended when the fabricated item is for use in corrosion service.

Hastelloy C-276 ASTM Specification:

Pipe Smls	Pipe Welded	Tube Smls	Tube Welded	Sheet / Plate	Bar	Forging	Fitting
B622	B619	B622	B626	B575	B574	B564	B366

Welding Wire Designations:
AWS A5.14 - ERNiCrMo4

Mechanical Properties of Hastelloy C-276:

Typical Room Temperature Tensile Properties of Annealed Material

Product Form	Tensile Min. (ksi)	0.2% Yield Min. (ksi)	Elongation Min (%)
Rod & Bar	110	52.6	62
Sheet/Plate	107.4	50.3	67
Welded Pipe & Tube	115.5	54.6	60
Seamless Pipe & Tube	105.4	45.3	70