Nickel Alloy Alloy 689-SA (Solution annealed)
Heat-treated state
UNS N07252
Softest supplied condition for machining, forming or welding before the ageing treatment.
Values for the SA condition
Other Alloy 689 tempers and conditions
Alloy 689 is listed in 5 conditions; see the grade overview at Alloy 689.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SAThis page Solution annealed | Softest supplied condition for machining, forming or welding before the ageing treatment. | 585 | 965 | 32 | 22 HRC | — |
As-hot-worked / as-forged | Intermediate mill product supplied for further forging or re-heat-treatment; properties not guaranteed. | 690 | 1,050 | 24 | 28 HRC | 1.5 % IACS |
Double aged | Stabilising intermediate age before the final age; chosen for long-time creep and rupture ductility at 700–815 °C. | 820 | 1,200 | 18 | 34 HRC | 1.5 % IACS |
STADefault Solution treated and aged | Standard fully heat-treated condition for turbine discs, shafts and bolting up to ~815 °C. | 840 | 1,240 | 16 | 35 HRC | — |
Low-temperature solution (≈1010 °C) + 760 °C age | Finer grain, higher room- and intermediate-temperature strength; use where tensile/LCF strength matters more than creep-rupture life. | 900 | 1,310 | 18 | 37 HRC | 1.4 % IACS |
What is Alloy 689-SA?
Alloy 689-SA is Alloy 689 heat treated to SA — softest supplied condition for machining, forming or welding before the ageing treatment. Alloy 689-SA has a yield strength of 585 MPa (84.8 ksi) and a tensile strength of 965 MPa (140 ksi) — stronger than 81% of nickel alloy grades. Elongation at break is 32% and the elastic modulus is 206 GPa (29.9 Msi). Alloy 689-SA has a density of 8.27 g/cm³ (0.299 lb/in³), lighter than 56% of nickel alloy grades. It melts at 1,315°C (2,399 °F). STA is the default condition FabDigit quotes; SA is available on request or by drawing note.
Advantages
- High strength — 585 MPa (84.8 ksi), better than 81% of nickel alloy grades
Limitations
- High embodied carbon — 15 kg CO₂/kg, worse than 87% of nickel alloy grades
Alloy 689-SA properties
Typical room-temperature values for Alloy 689-SA; 11 are specific to this condition. Other listed values are Alloy 689 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Alloy 689-SA has a density of 8.27 g/cm³ (0.299 lb/in³), lighter than 56% of nickel alloy grades. It melts at 1,315°C (2,399 °F).
Mechanical14
Alloy 689-SA has a yield strength of 585 MPa (84.8 ksi) and a tensile strength of 965 MPa (140 ksi) — stronger than 81% of nickel alloy grades. Elongation at break is 32% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
Alloy 689-SA is rated for continuous service to 700°C (1,292 °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 11.9 µm/m·K (6.61 µin/in·°F).
Electrical3
Alloy 689-SA conducts electricity at 1.5 % IACS, better than 50% 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 Alloy 689-SA takes about 230 MJ of energy and emits 15 kg of CO₂ — more than 91% of nickel alloy grades. Typical recycled content is 30%.
Manufacturability8
Alloy 689-SA's machinability is poor (22/100, better than 64% of nickel alloy grades); weldability fair (45/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Alloy 689-SA
Is Alloy 689 easy to machine?
Machine in the solution-annealed condition where possible; rigid setups, positive-rake carbide or ceramic tools, low speed / heavy feed and flood coolant, and expect grinding or EDM for finishing after ageing.
Can Alloy 689 be welded?
GTAW with matched or Ni-Cr-Co filler on solution-annealed material only, low heat input, followed by full re-solution and age — the ~3.6 % Ti+Al makes it prone to strain-age cracking on reheating.
Can Alloy 689 be formed, bent or molded?
Hot work at roughly 1050–1180 °C with generous reheats; cold forming is limited to mild bends in the annealed state because of very high work-hardening rate.
What surface finishes work on Alloy 689?
Grit blast plus pickle or vacuum-clean before brazing/coating; shot peening is standard for fatigue life, and aluminide or MCrAlY coatings are used for hot-gas surfaces — anodizing does not apply.
Alloy 689 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 |
|---|---|---|
| Ccarbide former for grain-boundary strength | 0.1 – 0.2 | 0.15 |
| Cr | 18 – 20 | 19 |
| Co | 9 – 11 | 10 |
| Mosolid-solution strengthener | 9 – 10.5 | 10 |
| Tiγ′ former | 2.25 – 2.75 | 2.6 |
| Alγ′ former | 0.75 – 1.25 | 1 |
| Fe | ≤ 2 | 1 |
| Mn | ≤ 0.5 | — |
| Si | ≤ 0.5 | — |
| Bgrain-boundary creep resistance | 0 – 0.01 | 0.01 |
| S | ≤ 0.02 | — |
| P | ≤ 0.02 | — |
| Nibalance, nominally ~56 % | balance | — |
Alloy 689-SA — frequently asked
What is Alloy 689-SA used for?
Alloy 689-SA is typically used for precision high-temperature fixtures, instrumentation components in hot zones, high-temperature bolting, turbine hardware forgings, heat-treat and brazing jigs and dimensionally critical hot-section brackets. In short: dimensional stability at 815 °C; aged strength near 1240 MPa; strain-age cracking sensitive.
What is the yield strength of Alloy 689-SA?
Alloy 689-SA has a typical yield strength of 585 MPa (84.8 ksi) and a tensile strength of 965 MPa (140 ksi) — stronger than 81% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Alloy 689-SA easy to machine?
Not especially — machinability is rated poor (22/100, better than 64% of nickel alloy grades). Machine in the solution-annealed condition where possible; rigid setups, positive-rake carbide or ceramic tools, low speed / heavy feed and flood coolant, and expect grinding or EDM for finishing after ageing.
Can Alloy 689-SA be welded?
With care — weldability is rated fair (45/100). GTAW with matched or Ni-Cr-Co filler on solution-annealed material only, low heat input, followed by full re-solution and age — the ~3.6 % Ti+Al makes it prone to strain-age cracking on reheating.
What surface finishes work on Alloy 689-SA?
Grit blast plus pickle or vacuum-clean before brazing/coating; shot peening is standard for fatigue life, and aluminide or MCrAlY coatings are used for hot-gas surfaces — anodizing does not apply.
Can Alloy 689-SA be formed, bent or molded?
Hot work at roughly 1050–1180 °C with generous reheats; cold forming is limited to mild bends in the annealed state because of very high work-hardening rate.
What is the maximum service temperature of Alloy 689-SA?
Alloy 689-SA is rated for continuous use to about 700°C (1,292 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Alloy 689-STA and Alloy 689-SA?
STA is the default condition — standard fully heat-treated condition for turbine discs, shafts and bolting up to ~815 °C. SA: softest supplied condition for machining, forming or welding before the ageing treatment. Yield strength is 840 MPa in STA versus 585 MPa in SA.
Sources
- ASM Specialty Handbook: Heat-Resistant Materials — ASM International (1997)
- ASM Handbook Vol. 1: Properties and Selection — Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Superalloys II (Sims, Stoloff, Hagel) — Wiley (1987)
- ASTM B637 — Precipitation-Hardening Nickel Alloy Bars, Forgings and Forging Stock for High-Temperature Service — ASTM International (2018)
- UNS N07252 alloy designation record — SAE/ASTM Unified Numbering System (2020)
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.