Nickel-chromium Alloys

nickel-chromium alloys

Inconel alloy 718

Common Trade Names: Inconel 718, Alloy 718, Nickel 718, Nicrofer 5219, Alvac 718, Haynes 718, Altemp 718.

INCONEL alloy 718 (UNS N07718/W.Nr. 2.4668) is a high-strength, corrosion-resistant nickel chromium material used at -423° to 1300°F. 

The age-hardenable alloy can be readily fabricated, even into complex parts. Its welding characteristics, especially its resistance to postweld cracking, are outstanding. The ease and economy with which INCONEL® alloy 718 can be fabricated, combined with good tensile, fatigue, creep, and rupture strength, have resulted in its use in a wide range of applications. Examples of these are components for liquid fueled rockets, rings, casings and various formed sheet metal parts for aircraft and land-based gas turbine engines, and cryogenic tankage. It is also used for fasteners and instrumentation parts.

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

Specifications

INCONEL alloy 718 is designated at UNS N07718, UNS N07719, and Werkstoff Nr. 2.4668. It is listed in NACE MR- 01-75, API 6A718 for oil and gas service. 

Rod, Bar, Wire and Forging Stock:  ASTM B637, AMS 5662, AMS 5663.,

Flanges, Forged fittings, Valve parts:  ASTM B637.

Chemical Composition

Nickel (plus Cobalt) .......................................................50.00-55.00 
Chromium ......................................................................17.00-21.00 
Iron .....................................................................................Balance* 
Niobium (plus Tantalum)....................................................4.75-5.50 
Molybdenum .....................................................................2.80-3.30
Titanium.............................................................................0.65-1.15 
Aluminum ..........................................................................0.20-0.80 
Cobalt ...............................................................................1.00 max.
Carbon..............................................................................0.08 max. 
Manganese .......................................................................0.35 max. 
Silicon ...............................................................................0.35 max.
Phosphorus.....................................................................0.015 max.
Sulfur...............................................................................0.015 max. 
Boron ..............................................................................0.006 max.
Copper..............................................................................0.30 max.

mechanical property:

specifications:

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