Nickel Alloy Nimonic 75-SA (Solution annealed / softened)
Heat-treated state · default condition
UNS N06075 · EN 2.4951, NiCr20Ti · BS HR1
Standard stocked condition for sheet, plate, bar and tube; maximum ductility and formability with stable grain-boundary carbides.
Values for the SA condition
Other Nimonic 75 tempers and conditions
Nimonic 75 is listed in 6 conditions; see the grade overview at Nimonic 75.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefaultThis page 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 |
What is Nimonic 75-SA?
Nimonic 75-SA is Nimonic 75 heat treated to SA — standard stocked condition for sheet, plate, bar and tube; maximum ductility and formability with stable grain-boundary carbides. Nimonic 75-SA 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). Nimonic 75-SA 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).
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-SA properties
Typical room-temperature values for Nimonic 75-SA; 13 are specific to this condition. Other listed values are Nimonic 75 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Nimonic 75-SA 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-SA 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-SA 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-SA 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-SA 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-SA'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. Confirm any required mill or lot documentation when quoting.
Working with Nimonic 75-SA
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.
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.
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) | — |
Nimonic 75-SA — frequently asked
What is Nimonic 75-SA used for?
Nimonic 75-SA 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-SA?
Nimonic 75-SA 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-SA 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-SA 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-SA?
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-SA 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-SA?
Nimonic 75-SA 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.