What Is the Difference Between NIMONIC Bar and Inconel Bar?

Element	NIMONIC 80A (%)	Inconel 718 (%)
Nickel (Ni)	~69	50–55
Chromium (Cr)	~20	17–21
Titanium (Ti)	2.0–2.5	0.65–1.15
Aluminum (Al)	1.0–1.8	0.2–0.8
Cobalt (Co)	Optional (~2%)	—
Molybdenum	—	2.8–3.3
Niobium	—	4.75–5.5
Iron (Fe)	Balance	Remainder (~17%)

Conclusion:
NIMONIC is more focused on thermal and creep strength, while Inconel adds molybdenum and niobium for enhanced corrosion resistance and structural integrity.

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4. Temperature Resistance

NIMONIC Bar:

• Performs excellently in temperatures above 800°C

• Ideal for jet engine blades, turbine discs, and exhaust valves

Inconel Bar:

• Excellent performance in both high and cryogenic temperatures

• Inconel 718 maintains strength up to 700°C, and Inconel 600 up to 1090°C

Conclusion:
NIMONIC has a slight edge in sustained high-temperature stability, whereas Inconel offers broader temperature tolerance.

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5. Mechanical Strength and Creep Resistance

• NIMONIC alloys like 80A and 90 are designed for creep resistance under prolonged stress at high temperatures.

• Inconel 718, with age hardening, offers high tensile, fatigue, and rupture strength, even after long service durations.

Both alloys exhibit excellent mechanical strength, but NIMONIC is often preferred in rotating turbine parts due to better creep behavior.

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6. Corrosion and Oxidation Resistance

Inconel Bar:

• Superior resistance to acidic, seawater, and oxidizing environments

• Ideal for chemical processing, marine, and aerospace structures

NIMONIC Bar:

• Strong oxidation resistance but not as corrosion-resistant as Inconel

• Mostly used in controlled environments like engines or turbines

Conclusion:
Inconel wins for corrosion resistance, especially in harsh chemical or marine environments.

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7. Weldability and Machinability

• Inconel 625 and 600 are relatively easier to weld and fabricate.

• NIMONIC alloys are more difficult to weld due to high carbon and titanium content, which can cause cracking without proper techniques.

Machinability:
Both materials are hard to machine, but Inconel generally offers better workability when processed with appropriate tools and techniques.

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8. Typical Applications

NIMONIC Bar Applications:

• Turbine blades

• Jet engine components

• Exhaust valves

• High-temperature springs

• Nuclear reactor core parts

Inconel Bar Applications:

• Chemical processing equipment

• Heat exchangers and condensers

• Marine hardware

• Aerospace fasteners and components

• Cryogenic tanks

sasaalloy offers both NIMONIC and Inconel round bars for advanced engineering applications, with full traceability and certification.

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9. Industry Standards

NIMONIC Bars Common Standards:

• BS HR1

• AMS 5829

• ASTM B637 (for some grades)

Inconel Bars Common Standards:

• ASTM B446 (Inconel 625)

• ASTM B637 (Inconel 718)

• AMS 5662, AMS 5663

• ASME SB-166, SB-564

sasaalloy ensures all bars conform to relevant ASTM, AMS, and EN specifications as required by the client.

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10. Cost Considerations

• NIMONIC bars are generally more expensive per kg, especially in grades like 90 and 105, due to high nickel and cobalt content.

• Inconel bars are also costly, but Inconel 625 and 718 are more widely available, potentially lowering procurement costs.

For budget-conscious projects requiring corrosion resistance, Inconel is often the more practical choice.

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11. Summary Table