Nickel-Chromium-Iron Alloys

Composition

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44.2-72+% Nickel, 14-31% Chromium, 3-20% Iron. Common fourth addition is Molybdenum, followed by balances of Cobalt, Niobium, Titanium, Aluminium, Carbon, Manganese and SIlicon.

Common Shapes

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Nickel-Chromium-Iron Alloys are commonly available in

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• Sheets and Plates

• Welded & Seamless Tubes and Pipes 

• Structural profiles

• Wire

• Rods

• Bars

• Fittings

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(Not all alloys or tempers available in all shapes)

Characteristics

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• Stable, thick Cr₂O₃ film layer, strengthened when heated, giving excellent corrosion resistance.

• Reliable strength over wide temperature range

• Excellent creep resistance at high temperatures

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Uses

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• Gas turbine blades

• Jet engine components

• Turbo charger rotors

• Pressure vessels, especially 718 in cryogenic use.

• Heat exchangers

• Exhaust systems

Weldability

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Nickel-Chromium-Iron Alloys are not easily welded, with the exception of Alloys 625 and 718, which are weldable via MTAW welding.

Machinability

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Nickel-Chromium-Iron Alloys are not readily machined, due to their rapid work hardening.

Commonly Used Alloys

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600 | 601 | 617 | 625 | 690 | 718 | 725 | 738

X-750

Common Trade Names

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Inconel®, Chronin®, Altemp®, Haynes®, Nicrofer®