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Alloy C276 • UNS N10276 • WNR 2.4819

C276 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 chromium, molybdenum and tungsten contents make the 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. Alloy C276 is widely used in the most severe environments such as mixed acid chemical processing, pollution control, pulp and paper production, industrial and municipal waste treatment, and recovery of sour oil and gas.

Available tube product forms

Typical Applications

  • Pollution control
  • Mixed acid chemicals
  • Pulp and paper production
  • Waste treatment
  • Very high chloride environments

Typical manufacturing specifications

  • ASTM B626
  • ASTM B622
  • Also individual customer specifications.

Industries predominantly using this grade

Technical Data

Mechanical Properties

Temper Annealed
Tensile Rm 100 ksi (min)
Tensile Rm 690 MPa (min)
R.p. 0.2% Yield 41 ksi (min)
R.p. 0.2% Yield 290 MPa (min)
Elongation (2” or 4D gl) 40 % (min)

Physical Properties (Room Temperature)

Specific Heat (0-100°C) 427°K-1
Thermal Conductivity 9.4 W.m -1.°K-1
Thermal Expansion 11.2 μm/μm/°C
Modulus Elasticity 221 GPa
Electrical Resistivity 1.30 μohm/cm
Density 8.89 g/cm3

Chemical Composition (% by weight)

Element Min Max
C - 0.02
Si - 0.08
Mn - 1
P - 0.03
S - 0.3
Co - 2.5
Fe 4 7
Cr 14.5 16.5
Cu 3 4.5
Mo 15 17
V - 0.35
Ni Balance