Nickel Alloy Inconel 752-STA (Solution treated and aged)
Heat-treated state · default condition
UNS N07752
Standard high-strength condition for turbine bolting, discs and heavily loaded parts up to ~870 °C.
Values for the STA condition
Other Inconel 752 tempers and conditions
Inconel 752 is listed in 6 conditions; see the grade overview at Inconel 752.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest condition — pick it for forming, deep drawing, machining or welding before final ageing. | 380 | 840 | 42 | 190 HB | — |
Equalized 885 °C/24 h + aged 704 °C/20 h | Classic exhaust-valve / valve-seat treatment: best combination of hot hardness, relaxation resistance and ductility for 650–815 °C service. | 730 | 1,120 | 25 | 33 HRC | 1.4 % IACS |
Hot rolled/forged then aged 704 °C/20 h | Economical aged bar/forging condition when full solution treatment is not required and moderate strength suffices. | 760 | 1,140 | 20 | 34 HRC | 1.4 % IACS |
STADefaultThis page Solution treated and aged | Standard high-strength condition for turbine bolting, discs and heavily loaded parts up to ~870 °C. | 820 | 1,210 | 22 | 36 HRC | — |
Cold drawn then aged 704 °C/20 h | Cold-drawn bar/wire with ageing for maximum room-temperature strength in fasteners and small machined parts. | 1,000 | 1,310 | 15 | 39 HRC | 1.4 % IACS |
Spring hard | Wire/strip condition for high-temperature springs and diaphragms where relaxation resistance to ~650 °C is needed. | 1,170 | 1,450 | 8 | 43 HRC | 1.4 % IACS |
What is Inconel 752-STA?
Inconel 752-STA is Inconel 752 heat treated to STA — standard high-strength condition for turbine bolting, discs and heavily loaded parts up to ~870 °C. Inconel 752-STA has a yield strength of 820 MPa (119 ksi) and a tensile strength of 1,210 MPa (175 ksi) — stronger than 87% of nickel alloy grades. Elongation at break is 22% and the elastic modulus is 214 GPa (31 Msi). Inconel 752-STA has a density of 8.28 g/cm³ (0.299 lb/in³), lighter than 55% of nickel alloy grades. It melts at 1,393°C (2,539 °F).
Advantages
- High strength — 820 MPa (119 ksi), better than 87% of nickel alloy grades
Limitations
- Difficult to weld — 30/100, worse than 78% of nickel alloy grades
Inconel 752-STA properties
Typical room-temperature values for Inconel 752-STA; 13 are specific to this condition. Other listed values are Inconel 752 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Inconel 752-STA has a density of 8.28 g/cm³ (0.299 lb/in³), lighter than 55% of nickel alloy grades. It melts at 1,393°C (2,539 °F).
Mechanical15
Inconel 752-STA has a yield strength of 820 MPa (119 ksi) and a tensile strength of 1,210 MPa (175 ksi) — stronger than 87% of nickel alloy grades. Elongation at break is 22% and the elastic modulus is 214 GPa (31 Msi).
Thermal6
Inconel 752-STA is rated for continuous service to 870°C (1,598 °F). It conducts heat at 12 W/m·K (6.93 BTU/hr·ft·°F), better than 65% of nickel alloy grades. Thermal expansion is 12.6 µm/m·K (7 µin/in·°F).
Electrical3
Inconel 752-STA conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), worse than 77% of nickel alloy grades.
Sustainability4
Producing a kilogram of Inconel 752-STA takes about 145 MJ of energy and emits 11.5 kg of CO₂ — less than 77% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability8
Inconel 752-STA's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability poor (30/100); formability poor (25/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Inconel 752-STA
Is Inconel 752 easy to machine?
Machine in the annealed condition where possible; aged material needs rigid setups, positive-rake carbide or ceramic, 15–30 m/min, heavy flood coolant and constant feed to avoid work hardening.
Can Inconel 752 be welded?
GTAW with Inconel 718/A-286 or matching filler on solution-annealed base metal only; re-solution and re-age after welding to avoid strain-age cracking, and keep heat input low.
Can Inconel 752 be formed, bent or molded?
Cold form only in the annealed state with high forming loads and frequent intermediate anneals; hot work at 1010–1175 °C and finish above 950 °C.
What surface finishes work on Inconel 752?
Not anodizable — pickle/grit blast to remove tenacious oxide, then electropolish, passivate or apply aluminide/Cr plating for hot-gas or wear surfaces.
Inconel 752 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 | 14 – 17 | 15.5 |
| Fe | 5 – 9 | 7 |
| Tireduced vs X-750 to raise Al/Ti ratio; low confidence | 1.4 – 2.2 | 1.8 |
| Alraised vs X-750/751 for γ′ stability; low confidence | 1.6 – 2.6 | 2.1 |
| NbNb+Ta | 0.7 – 1.2 | 0.9 |
| Mn | ≤ 1 | 0.3 |
| Si | ≤ 0.5 | 0.2 |
| C | ≤ 0.08 | 0.04 |
| Cu | ≤ 0.5 | 0.05 |
| Co | ≤ 1 | 0.3 |
| S | ≤ 0.01 | 0 |
| Niplus cobalt, balance | ≥ 70 (balance) | — |
Inconel 752-STA — frequently asked
What is Inconel 752-STA used for?
Inconel 752-STA is typically used for turbine blades, exhaust valves, high-temperature springs and aerospace fasteners. In short: exhaust valve superalloy; hotter X-750 variant; 870 °C service capability.
What is the yield strength of Inconel 752-STA?
Inconel 752-STA has a typical yield strength of 820 MPa (119 ksi) and a tensile strength of 1,210 MPa (175 ksi) — stronger than 87% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is Inconel 752-STA easy to machine?
Not especially — machinability is rated poor (15/100, worse than 76% of nickel alloy grades). Machine in the annealed condition where possible; aged material needs rigid setups, positive-rake carbide or ceramic, 15–30 m/min, heavy flood coolant and constant feed to avoid work hardening.
Can Inconel 752-STA be welded?
Not readily — weldability is rated poor (30/100). GTAW with Inconel 718/A-286 or matching filler on solution-annealed base metal only; re-solution and re-age after welding to avoid strain-age cracking, and keep heat input low.
What surface finishes work on Inconel 752-STA?
Not anodizable — pickle/grit blast to remove tenacious oxide, then electropolish, passivate or apply aluminide/Cr plating for hot-gas or wear surfaces.
Can Inconel 752-STA be formed, bent or molded?
Cold form only in the annealed state with high forming loads and frequent intermediate anneals; hot work at 1010–1175 °C and finish above 950 °C.
What is the maximum service temperature of Inconel 752-STA?
Inconel 752-STA is rated for continuous use to about 870°C (1,598 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Inconel 752-STA and Inconel 752-ANN?
STA is the default condition — standard high-strength condition for turbine bolting, discs and heavily loaded parts up to ~870 °C. ANN: softest condition — pick it for forming, deep drawing, machining or welding before final ageing. Yield strength is 820 MPa in STA versus 380 MPa in ANN.
Sources
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Ni-Cr-Fe age-hardenable alloys) — ASM International (1990)
- ASTM B637 — Precipitation-Hardening Nickel Alloy Bars, Forgings and Forging Stock for High-Temperature Service — ASTM (2018)
- UNS N07752 / N07750 alloy designations, Metals & Alloys in the Unified Numbering System — SAE/ASTM (2017)
- INCONEL alloy X-750 and alloy 751 technical bulletins (property analogues) — Special Metals Corporation (2004)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (Ni-base precipitation-hardened alloys) — ASM International (1993)
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.