Nickel Alloy Nimonic 75
UNS N06075 · EN 2.4951, NiCr20Ti · BS HR1
Solid-solution Ni-Cr alloy with minor Ti/C additions for grain-boundary carbide stabilization, offering good oxidation resistance and moderate strength up to ~900°C, often used as sheet for hot-section components.
Reference datasheet — Nimonic 75 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the SA condition
Nimonic 75 tempers and conditions
Nimonic 75 is supplied in 6 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution annealed / softened | Standard stocked condition for sheet, plate, bar and tube; maximum ductility and formability with stable grain-boundary carbides. | 300 | 750 | 40 | 180 HB | — |
Hot rolled | Choose for thicker bar, forging stock and heavy plate where mill-scale surface and slightly coarser grain are acceptable. | 330 | 780 | 37 | 195 HB | 1.6 % IACS |
Stress relieved | Applied to formed or welded assemblies to remove residual stress and stabilise carbides without fully recrystallising the structure. | 400 | 800 | 32 | 210 HB | 1.6 % IACS |
CR half hard | Intermediate strength/springiness for clips, shims and lightly formed brackets that will not be re-annealed. | 570 | 870 | 20 | 24 HRC | 1.6 % IACS |
Cold drawn | Use where higher room-temperature yield strength, straightness and a bright ground/drawn surface are needed on small-diameter bar. | 650 | 900 | 18 | 26 HRC | — |
CR hard | Highest room-temperature strength; only for cold-service springs and flat stock, since recrystallisation removes the strengthening above ~600 °C. | 820 | 1,030 | 8 | 33 HRC | 1.6 % IACS |
Supply forms, finishes and certifications
Ways Nimonic 75 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CRM | Certified reference material grade | Certification |
What is Nimonic 75?
Solid-solution Ni-Cr alloy with minor Ti/C additions for grain-boundary carbide stabilization, offering good oxidation resistance and moderate strength up to ~900°C, often used as sheet for hot-section components. Nimonic 75 has a density of 8.37 g/cm³ (0.302 lb/in³), heavier than 55% of nickel alloy grades. It melts at 1,340°C (2,444 °F). Nimonic 75 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 750 MPa (109 ksi) — weaker than 78% of nickel alloy grades. Elongation at break is 40% and the elastic modulus is 206 GPa (29.9 Msi).
What is Nimonic 75 used for?
- gas turbine combustion chamber sheet parts
- exhaust and afterburner components
- furnace fixtures
- thermocouple sheathing
Advantages
- Forms and bends easily — 78/100, better than 87% of nickel alloy grades
Limitations
- Low strength — 300 MPa (43.5 ksi), worse than 78% of nickel alloy grades
Nimonic 75 properties
Typical room-temperature values for Nimonic 75-SA; bars are the position among nickel alloy grades.
Physical3
Nimonic 75 has a density of 8.37 g/cm³ (0.302 lb/in³), heavier than 55% of nickel alloy grades. It melts at 1,340°C (2,444 °F).
Mechanical14
Nimonic 75 has a yield strength of 300 MPa (43.5 ksi) and a tensile strength of 750 MPa (109 ksi) — weaker than 78% of nickel alloy grades. Elongation at break is 40% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
Nimonic 75 is rated for continuous service to 950°C (1,742 °F). It conducts heat at 11.7 W/m·K (6.76 BTU/hr·ft·°F), better than 61% of nickel alloy grades. Thermal expansion is 12.7 µm/m·K (7.06 µin/in·°F).
Electrical3
Nimonic 75 conducts electricity at 1.6 % IACS, better than 70% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), worse than 71% of nickel alloy grades.
Sustainability4
Producing a kilogram of Nimonic 75 takes about 160 MJ of energy and emits 12 kg of CO₂ — less than 53% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability8
Nimonic 75's machinability is poor (28/100, better than 82% of nickel alloy grades); weldability very good (80/100); formability very good (78/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. Nimonic 75 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Nimonic 75
Is Nimonic 75 easy to machine?
Work-hardening and gummy: use rigid setups, positive-rake carbide or sharp HSS-Co tooling, 15–30 m/min with heavy feed, flood coolant and no dwelling to avoid glazing.
Can Nimonic 75 be welded?
Readily joined by GTAW/GMAW/resistance welding with matching NiCr20Ti or Inconel 82/625 filler; keep interpass temperature low, use clean surfaces (S-free) and avoid heavy restraint.
Can Nimonic 75 be formed, bent or molded?
Excellent cold formability in the annealed state (deep drawing, spinning, bending) but needs ~2× the force of austenitic stainless; interstage anneal at 1020–1080 °C after heavy reductions; hot work 1000–1180 °C.
Nimonic 75 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cr | 18 – 21 | 19.5 |
| Ticarbide former | 0.2 – 0.6 | 0.4 |
| C2.4630 / low-C variants specify ≤0.10 | 0.08 – 0.15 | 0.11 |
| Fe | ≤ 5 | 2 |
| Mn | ≤ 1 | 0.3 |
| Si | ≤ 1 | 0.4 |
| Co | ≤ 2 | 0.3 |
| Cu | ≤ 0.5 | 0.1 |
| Al | ≤ 0.5 | 0.15 |
| S | ≤ 0.02 | 0.01 |
| B | ≤ 0.01 | |
| Zr | ≤ 0.15 | |
| Nibalance, min ~70 % | ≥ 70 (balance) |
What surface finishes work on Nimonic 75?
Pickle/bright-anneal to remove Cr-rich scale before service; can be electropolished, ground and mechanically polished; not anodizable — use no coating for oxidation service or aluminide/Pt-Al diffusion coatings for very hot parts.
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy Nimonic 75 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N06075
- EN / DIN / Werkstoff-Nr.
- 2.4951NiCr20TiNiCr20Ti22.4630
- BS
- HR1
How much does Nimonic 75 cost?
Nimonic 75 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Nimonic 75 — frequently asked
What is Nimonic 75 used for?
Nimonic 75 is typically used for gas turbine combustion chamber sheet parts, exhaust and afterburner components, furnace fixtures and thermocouple sheathing. In short: formable hot-section sheet alloy; oxidation resistant to 950 °C; weldable, moderate strength.
What is the yield strength of Nimonic 75?
Nimonic 75 has a typical yield strength of 300 MPa (43.5 ksi) and a tensile strength of 750 MPa (109 ksi) — weaker than 78% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is Nimonic 75 easy to machine?
Not especially — machinability is rated poor (28/100, better than 82% of nickel alloy grades). Work-hardening and gummy: use rigid setups, positive-rake carbide or sharp HSS-Co tooling, 15–30 m/min with heavy feed, flood coolant and no dwelling to avoid glazing.
Can Nimonic 75 be welded?
Yes — weldability is rated very good (80/100). Readily joined by GTAW/GMAW/resistance welding with matching NiCr20Ti or Inconel 82/625 filler; keep interpass temperature low, use clean surfaces (S-free) and avoid heavy restraint.
What surface finishes work on Nimonic 75?
Pickle/bright-anneal to remove Cr-rich scale before service; can be electropolished, ground and mechanically polished; not anodizable — use no coating for oxidation service or aluminide/Pt-Al diffusion coatings for very hot parts.
Can Nimonic 75 be formed, bent or molded?
Excellent cold formability in the annealed state (deep drawing, spinning, bending) but needs ~2× the force of austenitic stainless; interstage anneal at 1020–1080 °C after heavy reductions; hot work 1000–1180 °C.
What is the maximum service temperature of Nimonic 75?
Nimonic 75 is rated for continuous use to about 950°C (1,742 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Nimonic 75-SA and Nimonic 75 CR-H?
SA is the default condition — standard stocked condition for sheet, plate, bar and tube; maximum ductility and formability with stable grain-boundary carbides. CR-H: highest room-temperature strength; only for cold-service springs and flat stock, since recrystallisation removes the strengthening above ~600 °C. Yield strength is 300 MPa in SA versus 820 MPa in CR-H.
How much does Nimonic 75 cost?
Nimonic 75 is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- NIMONIC alloy 75 Publication SMC-080 — Special Metals Corporation (2004)
- BS HR1 / BS 3072-3076 wrought nickel alloy sheet & bar — BSI (1989)
- DIN 17742 / VdTÜV 383 — NiCr20Ti (2.4951, 2.4630) — DIN (2002)
- ASTM B637 / UNS N06075 designation listing — ASTM / SAE (2018)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASM Handbook Vol.16 — Machining — ASM International (1989)
- BCR-661 Nimonic 75 certified reference material report — IRMM / EU JRC (2000)
- (GH3030 / NiCr20Ti) (2026)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.