Alloy C276 Tubing
Alloy C276 Tubing
Alloy C276 is a nickel-molybdenum-chromium-tungsten superalloy, showing excellent resistance to mechanical and chemical degradation. The high nickel and molybdenum content impart remarkable corrosion resistance in reducing environments, while chromium provides the same in an oxidizing media. Molybdenum also provides strong resistance to crevice corrosion and pitting. This alloy gives an excellent performance in a wide range of chemical processing conditions, often where nothing else works. Target applications include those involving strong oxidizers, such as ferric and cupric chlorides and hot
Product Specifications
ASTM B622, B829 / ASME SB622, SB829 / NACE MR0175
Size Range
Outside Diameter (OD) | Wall Thickness |
.250”–.500” | .035”–.065” |
Cold finished and bright annealed tube.
Chemical Requirements
Alloy C276 (UNS N10276)
Composition %
Ni | Cr Chromium | Mo | Fe | W | C Carbon | Si | Co | Mn | V | P Phosphorous | S |
57.0 min | 14.5–16.5 | 15.0–17.0 | 4.0–7.0 | 3.0–4.5 | 0.010 max | 0.08 max | 2.5 max | 1.0 max | 0.35 max | 0.04 max | 0.03 max |
Chemical Requirements
Alloy C276 (UNS N10276)
Composition %
Ni | Cr | Mo | Fe | W | C | Si | Co | Mn | V | P | S |
57.0 min | 14.5–16.5 | 15.0–17.0 | 4.0–7.0 | 3.0–4.5 | 0.010 max | 0.08 max | 2.5 max | 1.0 max | 0.35 max | 0.04 max | 0.03 max |
Dimensional Tolerances
OD | OD Tolerance | Wall Tolerance |
.250"–.500" | +.004”/-.005” | ± 15% |
Mechanical Properties
Yield Strength: | 41 ksi min |
Tensile Strength: | 100 ksi min |
Elongation (min 2"): | 40% |
Fabrication
Detailed fabrication and welding process information is available upon request.
Industry Applications
Chemical Process
C276 is one of the premier alloys in the chemical processing industry utilized for its excellent resistance against corrosion, pitting in high stress, oxidizing and reducing environments. The alloy is seen in applications in wastewater treatment, transfer tubing, wet chlorine and hypochlorites environments.
Oil & Gas
C276 is an excellent choice for flare applications where hydrofluoric acid is prevalent due its superior performance against stress corrosion cracking. Alloy C276 is used in recovery systems of sour natural gas and oil wells.
Power Generation
The addition of molybdenum and tungsten, combined with a high chromium content, makes C276 the material of choice for some of the most severe corrosive environments, particularly in pollution control and flue gas desulfurization. See power generation for more information.
