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Round,Square bars


Flanges & Other kinds of forgings products


Nickel-Chromium-Iron  N06690,Inconel 690,alloy 690, W. Nr. 2.4642

Chemical Compostion:

Ni Cr Iron Mn Cu Si     max S    max
58.0min 27.0-31.0 7.0-11.0 0.50 0.050 0.50 0.50 0.015


Mechanical Properties:


Tensile Strength,Min PSI (MPa) Yield Strength (0.2% offset) Min(Mpa) Elongation in 2 in. or 50mm or 4D,Min.,% Density
85000 (586) 35000 (241) 30 8.19g/cm3



Standard Material Seamless Tubing   &/or Pipe Plate/Sheet/Strip Bar Forging and   Forging stock
SB-167, SB-163 N06690 B167/SB-167,B163/SB-163,B829/SB-829 B168/SB-168 B564/SB-564



Inconel alloy 690

UNS N06690

Werkstoff Nr:2.4642

Alloy 690 is a high-chromium nickel alloy that exhibits excellent resistance to many corrosive aqueous media and high temperature environments by oxidizing acids,especially nitric acid,hydrofluoric acid and salts solutions, and to sulfidation at high-temperatures. Examples are tail-gas reheaters used in nitric acid production and heating coils and tanks for nitric/hydrofluoric solutions used in pickling of stainless steels and reprocessing of nuclear fuels.In addition to its corrosion resistance, alloy 690 has high strength, good metallurgical stability, and favourable fabrication characteristics.

However, the alloy shows excellent resistance to stress-corrosion cracking and low corrosion rates under various high-temperature solutions.


Manufacturing Process

Alloy 690 is readily fabricated using conventional techniques used for high-nickel alloys. This alloy is not hardenable by heat treatment, and it is normally used in the annealed condition.

It exhibits excellent weldability, and it can be welded using filler metals and welding electrode. The temperature range for heavy hot forming of alloy 690 is 1040 to 1230°C (1900 to 2250°F). Light forming can be done at temperatures down to 870°C (1600°F).

The following are some of the major applications of alloy 690:

  • Tail-gas reheaters used in nitric acid production
  • Coal-gasification units
  • Glass vitrification equipment for radioactive waste disposal
  • Incinerators
  • Furnaces for  petrochemical processing
  • Burners and  ducts for processing sulfuric acid