Incoloy is a family of nickel-iron-chromium alloys that spans three distinct engineering purposes. The 800 series — alloys 800, 800H, 800HT, 803, 890, DS and HR-120 — delivers oxidation, carburisation and sulfidation resistance with high creep-rupture strength for service up to 1200°C. The corrosion-resistant grades — alloys 825, 925, 945 and Alloy 20 — combine molybdenum and copper with a high nickel base to resist sulfuric and phosphoric acids, chloride pitting and sour hydrogen sulfide environments. The controlled-expansion superalloys — alloys 903, 907 and 909 — hold a constant low coefficient of thermal expansion and a constant elastic modulus for precision gas turbine hardware. Exotic Alloy manufactures the full Incoloy range of bolts, stud bolts, heavy hex nuts and custom CNC fasteners with traceability to ASTM, ASME, AMS, API and NACE MR0175 specifications.
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The substantial iron content of the Incoloy family makes these alloys noticeably more machinable than the nickel-base Inconel and Hastelloy grades, but they still work-harden and demand rigid setups, sharp positive-rake tooling and heavy uninterrupted feeds. Exotic Alloy runs dedicated CNC turning centres and thread-rolling machines across the full range, and controls the heat treatment that defines each grade — the 1149°C minimum solution anneal and coarse grain size that give alloys 800H and 800HT their creep strength, and the precipitation age cycles that develop the strength of alloys 903, 907, 909, 925 and 945.
A quick reference for the most common Incoloy alloys across global standards.
| Alloy Grade | UNS Designation | Werkstoff / DIN | ASTM / AMS Standards (Fasteners / Bars) |
|---|---|---|---|
| Incoloy 800 | N08800 | 1.4876 | ASTM B408 / ASME SB-408 |
| Incoloy 800H | N08810 | 1.4958 | ASTM B408 / ASME SB-408 |
| Incoloy 800HT | N08811 | 1.4959 | ASTM B408 / ASME Code Case 1987 |
| Incoloy 803 | S35045 | – | ASTM B408 / B409 / B407 |
| Incoloy 825 | N08825 | 2.4858 | ASTM B425 / B564 / NACE MR0175 |
| Incoloy 890 | N08890 | – | Mill & customer specification |
| Incoloy 903 | N19903 | – | AMS 5874 / AMS 5872 |
| Incoloy 907 | N19907 | – | AMS & customer specification |
| Incoloy 909 | N19909 | – | AMS 5884 |
| Incoloy 925 | N09925 | – | ASTM B805 / API 6ACRA / NACE MR0175 |
| Incoloy 945 | N09945 | – | API 6ACRA / NACE MR0175 |
| Alloy 20 | N08020 | 2.4660 | ASTM B473 / B462 / B464 |
| Incoloy DS | N08330 | 1.4862 | BS 3073 NA17 |
| Alloy HR-120 | N08120 | 2.4854 | ASTM B408 / B409 / AMS 5916 |
We are committed to delivering zero-defect Incoloy fasteners. All products undergo rigorous testing including PMI (Positive Material Identification), ASTM grain size verification for the creep-resistant grades, hardness testing per NACE MR0175, dimensional inspection, and material traceability with EN 10204 3.1 certification.
Exotic Alloy exports Incoloy fasteners to petrochemical, power generation, oil and gas, and aerospace clients worldwide. Our dedicated logistics team ensures secure export packaging and timely deliveries by sea and air freight with full customs documentation support.