The R alloys are the Rene family of gamma-prime strengthened nickel-base superalloys, developed by General Electric for gas turbine hot-section and rotating hardware. The three grades here are not variants of one material — they are three distinct alloys made by three different routes. Alloy 41 is wrought, supplied as bar, sheet, strip and wire, and has been a standard high-temperature bolting superalloy since the 1950s. Alloy 80 is a vacuum investment casting alloy for turbine blades and vanes, produced equiaxed, directionally solidified or as single crystal. Alloy 95 is a powder metallurgy alloy, hot isostatically pressed and isothermally forged into turbine discs, with a gamma-prime volume fraction close to 50%. Exotic Alloy supplies all three in the form each is actually made in — fasteners in alloy 41, near-net castings and forgings in alloys 80 and 95.
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Of the three R alloys, Alloy 41 is the wrought grade and the one to specify for bolts, stud bolts, nuts, screws and springs — it is machined in the solution-treated condition and aged to final strength. Alloy 80 is a cast turbine blade alloy and Alloy 95 is a powder metallurgy disc alloy; neither is rolled into bar and cut into threaded fasteners, and we supply them as near-net investment castings and HIP forgings finish machined to drawing. If your requirement is a high-temperature fastener, Alloy 41 is almost always the right answer in this family — and where the duty exceeds it, Waspaloy, Nimonic 105 or Inconel 718 may suit better. Tell us the service conditions and our technical team will confirm before you order.
Difficulty across this family tracks gamma-prime content almost exactly. Alloy 41 machines as a tough wrought superalloy — it work-hardens and its thermal conductivity of 9.0 W/m·K concentrates heat at the cutting edge, but conventional carbide turning and thread rolling are entirely practical in the solution-treated condition. Alloys 80 and 95, with gamma-prime fractions approaching and exceeding 45%, are cast or consolidated close to final shape precisely so that stock removal is minimal, and are finished by grinding, creep-feed grinding or EDM rather than conventional cutting.
Three distinct alloys, three production routes, three different jobs in an engine.
| Grade | UNS | Specifications | Production Route | Nominal Cr / Co / Mo | Typical Use |
|---|---|---|---|---|---|
| Alloy 41 — Rene 41 | N07041 | AMS 5712 / 5713 / 5545 / 5800 | Wrought bar, sheet, strip, wire | 19% / 11% / 9.75% | High-temperature bolting to 815°C |
| Alloy 80 — Rene 80 | – | Customer drawing | Vacuum investment cast | 14% / 9.5% / 4% | Turbine blades and vanes |
| Alloy 95 — Rene 95 | – | Customer drawing | Powder metallurgy, HIP / forged | 14% / 8% / 3.5% | Turbine discs below 650°C |
No UNS designation is assigned to Alloy 80 or Alloy 95. Rene is a trademark of the General Electric Company; Exotic Alloy is an independent manufacturer and is not affiliated with or endorsed by General Electric.
We are committed to delivering zero-defect R alloy components. All products undergo rigorous testing including PMI (Positive Material Identification), post-age hardness and tensile verification, orientation-specific certified data on castings, dimensional inspection, and material traceability with EN 10204 3.1 certification.
Exotic Alloy exports R alloy fasteners and components to aerospace, gas turbine, power generation and defence clients worldwide. Our dedicated logistics team ensures secure export packaging and timely deliveries by sea and air freight with full customs documentation support.