Nimonic Alloys
Nimonic 75 (UNS N06075) — Composition, Properties & Supply
Nimonic 75 (UNS N06075) is a Ni-Cr solid-solution high-temperature alloy containing about 19–21% chromium. It is not precipitation hardenable and relies on solid-solution strengthening and outstanding oxidation resistance, giving long service in oxidising atmospheres up to about 1000 °C. It is widely used in gas-turbine combustors, furnace components, heat-treatment fixtures and hot chemical plant parts.
What is the chemical composition of Nimonic 75?
| Element | Symbol | Content (wt%) |
|---|---|---|
| Ni | Ni | Balance |
| Cr | Cr | 18.0–21.0 |
| Fe | Fe | ≤ 5.0 |
| Ti | Ti | 0.20–0.60 |
| C | C | ≤ 0.12 |
| Si | Si | ≤ 1.00 |
| Mn | Mn | ≤ 1.00 |
| Cu | Cu | ≤ 0.50 |
Values are typical specification limits. Actual heat analysis is reported on the EN 10204 3.1 mill test certificate supplied with each shipment.
What are the mechanical properties of Nimonic 75?
| Property | Value | Note |
|---|---|---|
| Tensile strength | ≥ 560 MPa (annealed) | Room temperature |
| Yield strength (0.2% offset) | ≥ 245 MPa (annealed) | Room temperature |
| Elongation | ≥ 30 % | Gauge length 50 mm / 4D |
| Hardness | ≤ 200 HB | Brinell / Rockwell |
What are the physical properties of Nimonic 75?
| Property | Value |
|---|---|
| Density | 8.37 g/cm³ |
| Melting range | 1340–1390 °C |
| Thermal conductivity | 14.6 W/m·K |
| Elastic modulus | 200 GPa |
| Maximum service temperature | 1000 °C |
What are the key characteristics of Nimonic 75?
- Solid-solution strengthened, not age-hardenable
- Oxidation resistant to about 1000 °C
- Good formability and weldability (ERNiCr-3 filler)
- Used in the annealed condition at modest cost
Where is Nimonic 75 used?
- Gas-turbine combustors and flame tubes
- Furnace components and heat-treatment fixtures
- Hot chemical plant and heat exchangers
- Sheet, strip and welding-wire products
Which standards and specifications cover Nimonic 75?
- Werkstoff 2.4951
- DIN 17744
- AMS 5750
- UNS N06075
What product forms are available?
Frequently asked questions
How do Nimonic 75 and 80A differ?
75 is a solid-solution alloy, not age-hardenable, relying on about 20% chromium for oxidation resistance up to roughly 1000 °C in oxidising atmospheres, but its strength is far below 80A. 80A is γ′ precipitation-hardened and much stronger, yet its service temperature is typically below 815 °C. Choose 80A for creep strength and 75 where oxidation resistance, formability and weldability matter.
Need Nimonic 75 bar, tube, plate or forgings?
Send the grade, dimensions, standard and quantity. We answer within 10 minutes on working days and quote within 24 hours, with EN 10204 3.1 certification.
Request a Quote Chat on WhatsApp +86-156-1827-9078