Pipes,tubes
Buttweld Fitting
Round,Square bars
Plates,Sheets,Strips
Flanges & Other kinds of forgings products
Nickel-Chromium-Iron N06690,Inconel 690,alloy 690, W. Nr. 2.4642
Chemical Compostion:
| Ni | Cr | Iron | Mn | C | 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
|
STandards:
| 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