Nickel Alloy Alloy 689 STA-1010
Precip hard
UNS N07252
STA-1010 = 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.
Values for the STA-1010 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 |
|---|---|---|---|---|---|---|
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 | — |
STA-1010This page 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 STA-1010?
Alloy 689 STA-1010 is Alloy 689 in the STA-1010 condition — finer grain, higher room- and intermediate-temperature strength; use where tensile/LCF strength matters more than creep-rupture life. Alloy 689 STA-1010 has a yield strength of 900 MPa (131 ksi) and a tensile strength of 1,310 MPa (190 ksi) — stronger than 94% of nickel alloy grades. Elongation at break is 18% and the elastic modulus is 208 GPa (30.2 Msi). Alloy 689 STA-1010 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; STA-1010 is available on request or by drawing note.
Advantages
- High strength — 900 MPa (131 ksi), better than 94% of nickel alloy grades
Limitations
- High embodied carbon — 15 kg CO₂/kg, worse than 87% of nickel alloy grades
- Difficult to weld — 22/100, worse than 84% of nickel alloy grades
- Limited ductility — 18%, worse than 77% of nickel alloy grades
Alloy 689 STA-1010 properties
Typical room-temperature values for Alloy 689 STA-1010; 22 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 STA-1010 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 STA-1010 has a yield strength of 900 MPa (131 ksi) and a tensile strength of 1,310 MPa (190 ksi) — stronger than 94% of nickel alloy grades. Elongation at break is 18% and the elastic modulus is 208 GPa (30.2 Msi).
Thermal6
Alloy 689 STA-1010 is rated for continuous service to 760°C (1,400 °F). It conducts heat at 11.5 W/m·K (6.64 BTU/hr·ft·°F), better than 57% of nickel alloy grades. Thermal expansion is 11.9 µm/m·K (6.61 µin/in·°F).
Electrical3
Alloy 689 STA-1010 conducts electricity at 1.4 % IACS, worse than 51% 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 STA-1010 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 STA-1010's machinability is not recommended (12/100, worse than 86% of nickel alloy grades); weldability poor (22/100); formability poor (26/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Alloy 689 STA-1010
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 STA-1010 — frequently asked
What is Alloy 689 STA-1010 used for?
Alloy 689 STA-1010 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 STA-1010?
Alloy 689 STA-1010 has a typical yield strength of 900 MPa (131 ksi) and a tensile strength of 1,310 MPa (190 ksi) — stronger than 94% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Alloy 689 STA-1010 easy to machine?
Not especially — machinability is rated not recommended (12/100, worse than 86% 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 STA-1010 be welded?
Not readily — weldability is rated poor (22/100). 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 STA-1010?
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 STA-1010 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 STA-1010?
Alloy 689 STA-1010 is rated for continuous use to about 760°C (1,400 °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.