Inconel 690 Special Alloy GH3039 ЗИ602 ХН75МБГЮ High-Temperature
Alloy Used In Hardware In Nuclear Power Generation
Product Description
INCONEL® alloy 690 (UNS N06690/W. Nr. 2.4642) is a high-chromium
nickel alloy having excellent resistance to many corrosive aqueous
media and hightemperature atmospheres. In addition to its corrosion
resistance, alloy 690 has high strength, good metallurgical
stability, and favorable fabrication characteristics.
The substantial chromium content gives the alloy outstanding
resistance to oxidizing chemicals and to high-temperature oxidizing
gases.
The high level of nickel imparts resistance to stresscorrosion
cracking in chloride-containing environments as well as to sodium
hydroxide solutions. The properties of INCONEL alloy 690 are useful
for various applications involving nitric or nitric/hydrofluoric
acid solutions. 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.
The alloy’s resistance to sulfur-containing gases makes it an
attractive material for such applications as coal-gasification
units, burners and ducts for processing sulfuric acid, furnaces for
petrochemical processing, recuperators, incinerators, and glass
vitrification
equipment for radioactive waste disposal.
Similar Grade
| UNS | W-Nr | GH |
| N06690 | 2.4642 | GH3039 |
Chemical Composition(%)
| % | Ni | Cr | Fe | C | Mn | Si | P | S | Cu |
| Min | 58.0 | 27.0 | 5.0 | | | | | | |
| Max | | 31.0 | 11.0 | 0.05 | 0.5 | 0.5 | 0.02 | 0.015 | 0.5 |
Physical Properties
| Grade | Density | Melting Point | Tensile strength,MPa | Yield strength,MPa | Elongation,% |
| Inconel 690 | 8.19g/cm3 | 1343°C-1367 °C | 650 | 310 | 30 |
Feature
Inconel 690 has good resistance to oxidizing chemicals, such as
nitric acid, and to sulfur-containing gases at high temperature.
Inconel 690 has a superior stress cracking resistance than Inconel
600 in steam generation nuclear reactors for piping, separators and
weldments.
Specification Standard
| Rod,Bar | Pipe, Tube | Plate, Sheet, Strip | Pipe fittings | Forgings | Wire |
ASTM B166 DIN 17752 ISO 9723 | ASTM B163,B165,B829, B730,B751 DIN 17751 ISO 6207 | ASTM B127,B906 DIN 17750 ISO 6208 | ASTM B366 | ASTM B564 ISO 9725 DIN 17754 | ASTM B164 DIN 17753 ISO 9724 |
APPLICATIONS
In various types of high-temperature water, alloy 690 displays low
corrosion rates and excellent resistance to stress-corrosion
cracking. Thus, alloy 690 is widely used for steam generator tubes,
baffles, tubesheets, and hardware in nuclear power generation.
