corrosion resistance nickel base metal alloy

corrosion resistance nickel base metal alloy 

Inconel Alloy 725

Common Trade Names: Inconel Alloy 725; Nickel Alloy 725; Alloy 725; Nickel 725

Alloy 725 (UNS N07725) is a nickelchromium-molybdenum-niobium alloy that is highly resistant to corrosion and is age hardenable for extremely high strength. It has essentially the same corrosion resistance as Alloy 625, which is widely used in a broad range of severely corrosive environments.

The strength of age-hardened Alloy 725 is of the order of twice that of annealed Alloy 625. Because the strength of alloy 725 is developed by heat treatment, not by cold work, ductility and toughness remain high.

Also, strength can be imparted to large or non-uniform sections that cannot be strengthened by cold work. 

The substantial molybdenum content enhances resistance to reducing media and provides a high degree of resistance to pitting and crevice corrosion. Additionally, the combination of elements makes the alloy resistant to hydrogen embrittlement and stress corrosion cracking.

The properties of Alloy 725 are useful for a range of applications that require outstanding corrosion resistance along with high strength. The alloy is used for hangers, landing nipples, side pocket mandrels and polished bore receptacles in sour gas service, where it resists the effects of hydrogen sulfide, chlorides and carbon dioxide. The alloy is also attractive for high
strength fasteners in marine applications, where it resists corrosion, pitting and crevice attack in sea water.

Available Product Forms:
Rod, bar, forgings, wire, flanges, Forged fittings, valve parts. 

Specifications

Alloy 725 is designated as UNS N07725.It is listed in NACE MR-01-75, API 6A718 for oil and gas service.

Rod, Bar, Wire and Forging Stock: ASTM B637, ASTM B805; 
Flanges, Forged fittings, Valve parts:  ASTM B637.

Chemical Composition

Nickel.........................................................................55.0-59.0
Chromium..................................................................19.0-22.5
Molybdenum..................................................................7.0-9.5
Niobium.......................................................................2.75-4.0
Titanium.........................................................................1.0-1.7
Aluminum..................................................................0.35 max.
Carbon......................................................................0.03 max.
Manganese...............................................................0.35 max.
Silicon.......................................................................0.20 max.
Phosphorus.............................................................0.015 max.
Sulfur.......................................................................0.010 max.
Iron..............................................................................Balance*

mechanical property:

specifications:

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