Nimonic 75, 80A, 81, and 90 Foil: Precipitation-Hardening Nickel Alloys for Extreme High-Temperature Service
UNS N06075 | DIN 2.4951 | Optimized for oxidation resistance in power and aerospace applications.
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Gas Turbine Blade Failure Exposes Limits of Standard Alloys
During a routine inspection at a combined-cycle power plant in India, engineers discovered extensive cracking in turbine combustion liner foils after only 12,000 hours. The standard nickel-chromium foil succumbed to oxidation and creep at 850°C, forcing a $4 million overhaul and six-week outage. Root cause: insufficient gamma-prime strengthening against thermal fatigue exacerbated by cyclic loads. This failure propelled OEMs toward Nimonic 75, 80A, 81, and 90 foils, with Al/Ti precipitation hardening per UNS, ASTM, DIN standards for reliable high-temp performance.
These superalloys extend component life, slashing downtime in power generation and oil & gas sectors.
Equivalent Grades Across Global Standards
Nimonic 75 equivalents: Alloy 75, NA20 (BS), 2.4630 (DIN). 80A matches NC20TNA (AFNOR), 2.4631 WNr. Nimonic 90 aligns with Pyromet 90; 81 with similar creep-resistant grades. These facilitate seamless sourcing for fabricators comparing international specs.
Product Forms and Availability
Foil Specifications
Precision foil in 0.015-0.5mm thick, widths to 250mm, annealed or age-hardened tempers. Slit edges for turbine seals; complements Titanium Grade 5 UNS R56400 ASTM B265 plates in hybrid high-temp assemblies.
Other Forms
- Sheet/Plate: 0.5-20mm (solution treated)
- Bar and wire: forged for blades; AMS 5829 covers alloy 90 wire and ASTM B637 alloy 80A bar
- Custom coils for pharma heat exchangers
Why this grade
Nimonic 75 is an 80/20 nickel-chromium alloy with titanium stabilisation, and it is solid-solution strengthened only — it cannot be significantly age-hardened. That is precisely why it is chosen: it forms and welds readily with no solution-treat-and-age cycle and no strain-age cracking risk, which makes it the sheet-metal grade for gas turbine combustion hardware, furnace parts and heat-treatment fixtures.
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Secure Your High-Temp Solution Today
Certified compliance, proven properties, and global availability position Nimonic® 75, 80A, 81, 90 foils as trusted choices for enduring performance in harsh environments. What critical component can we supply for you?