Alloy C276,Precision metal foil and strip,Precision seamless tube,Profiled seamless tube

Overview

UNS N10276 is known for its corrosion resistance in a wide range of aggressive media. The high molybdenum content imparts resistance to localized corrosion such as pitting. The low carbon minimizes carbide precipitation during welding to maintain resistance to intergranular attack in heat-affected zones of welded joints.

Character

By virtue of extremely low carbon and silicon contents, N10276 is a wrought Ni-Cr-Mo material to alleviate concerns over welding. Like other nickel alloys, it is ductile, easy to form and weld, and possesses exceptional resistance to stress corrosion cracking in chloride-bearing solutions (a form of degradation to which the austenitic stainless steels are prone). With its high chromium and molybdenum contents, it is able to withstand both oxidizing and non-oxidizing acids, and exhibits outstanding resistance to pitting and crevice attack in the presence of chlorides and other halides. Furthermore, it is very resistant to sulfide stress cracking and stress corrosion cracking in sour, oilfield environments.

Application

UNS N10276 is used in chemical processing, pollution control, pulp and paper production, industrial and municipal waste treatment and the recovery of “sour” natural gas. Applications in air pollution control include stack liners, ducts, dampers, scrubbers, stack-gas re-heaters, fans and fan housings. In chemical processing, the alloy is used for components including heat exchanger, reaction vessels, evaporators, transfer piping and columns.

Chemical Composition (wt% as per ASTM B622)

Material	Fe	Ni	Co	Cr	V	Mo	Cu
Alloy C276	4.0-7.0	balance	≤2.50	14.5-16.5	≤0.35	15.0-17.0	≤0.50
Material	C	W	Mn	Si	p	S
Alloy C276	≤0.01	3.0-4.5	≤1.0	≤0.080	≤0.040	≤0.030

Mechanical Property

UNS N10276 in solution annealed condition as per ASTM B622

Material

Tensile strength

ksi (MPa)

Yield strength at

0.2 offset ksi (MPa)

Elongation in 2”

% min.

Reduction of area

% min.

UNS N10276

≥100 (690)

≥41 (283)

≥40

Corrosion Resistance

UNS N10276 is resistant to general corrosion, stress corrosion cracking, pitting and crevice corrosion in a broad range of severe environments. Its resistance to carbide precipitation during welding maintains corrosion resistance in the heat affected zones of welded joints.

It has exceptional resistance to sulfuric acid and hydrochloric acid. It resists many of the most severe media encountered in chemical processing, including reducing and oxidizing acids, highly oxidizing, neutral, and acid chlorides, solvents, formic and acetic acids, acetic anhydride, wet chlorine gas, hypochlorites, and chlorine solutions. It has excellent resistance to phosphoric acid. At all temperatures below the boiling point and at concentrations lower than 65 wt%, tests have shown corrosion rates of less than 5 mpy (0.13 mm/y).

Alloy C276 exhibits excellent resistance to corrosion by seawater especially under crevice conditions which induce attack in other commonly used materials such as 316 stainless steel, Monel® 400, and Inconel 625.

Product Forms

Form	Size range
Capillary tube	OD 0.15 ~ 6.0 mm WT 0.015 ~ 1.5 mm
Thin wall & Ultra thin wall seamless tube	OD6.0 ~80.0 mm WT 0.05 ~4.5 mm
Micro ID and heavy thick wall seamless tube	OD3.0 ~50.0 mm ID 0.30 ~5.0 mm
Precision conic seamless tube	Bigger end: OD3.0 - 426.0mm Smaller end: OD2.5 - 346.0mm WT: 0.15 - 40.0mm
HP /UHP BA+ tube EP tube	OD 1.0 ~ 76 mm WT 0.10 ~ 10.0 mm
Small caliber precision seamless tube	OD6.0 ~89 mm WT 0.50 ~9.0 mm