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Nickel alloy tubes

Alloy 690 • UNS N06690 • WNR 2.4642


Alloy 690 is a high-chromium nickel alloy having excellent resistance to many corrosive aqueous media and hightemperature atmospheres. The alloy’s high chromium content gives it excellent resistance to caturisation, metal dusting, oxidation and sulfidation at high temperature. In addition to its corrosion resistance, alloy 690 has high strength, good metallurgical stability, and favorable fabrication characteristics. Available tube product forms Straight Seamless Typical Applications Heat exchangers Steam Generators High temperature applications exposed to caustic solutions Typical manufacturing specifications ASTM B167 Also individual customer specifications. Industries predominantly using this grade Chemical processing Nuclear and power Oil and gas

Product features

Tensile Rm 590 MPa (min)
R.p. 0.2% Yield 35 ksi (min)
R.p. 0.2% Yield 240 MPa (min)
Elongation (2" or 4D gl) ≥30 % (min)
Thermal Conductivity 13.5 W.m -1.°K-1
Thermal Expansion 14 mm/m/°C
Modulus Elasticity 211 GPa
Electrical Resistivity 1.26 μohm/cm
Density 8.2 g/cm3

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