Nickel Alloy NiCo20Cr20MoTi ST+A
Precip hard
EN 2.4650
ST+A = solution treated 1150 °C + aged 800 °C/8 h, air cooled
Full γ′-hardened service condition after welding and forming; use where room- and high-temperature strength and creep life matter.
Values for the ST+A condition
Other NiCo20Cr20MoTi tempers and conditions
NiCo20Cr20MoTi is listed in 5 conditions; see the grade overview at NiCo20Cr20MoTi.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot rolled / hot forged + solution treated plate and forgings | Heavy plate, discs and rings hot worked then solution treated; slightly coarser grain and marginally lower strength than sheet. | 510 | 850 | 45 | 11 HRC | 1.5 % IACS |
As-welded deposit | Weld-metal/joint property level for fabricated sheet structures before the post-weld solution + age cycle. | 520 | 820 | 30 | 200 HB | 1.5 % IACS |
STDefault Solution annealed | Standard as-supplied sheet, plate, bar and ring condition: softest and most formable/weldable, aged after fabrication. | 540 | 880 | 42 | 190 HB | — |
ST+AThis page Solution treated 1150 °C + aged 800 °C/8 h, air cooled | Full γ′-hardened service condition after welding and forming; use where room- and high-temperature strength and creep life matter. | 620 | 1,060 | 25 | 31 HRC | — |
Cold drawn | Cold-worked small bar, wire and strip where higher as-supplied strength and close tolerance are wanted; anneal before heavy forming. | 800 | 1,050 | 15 | 32 HRC | 1.5 % IACS |
What is NiCo20Cr20MoTi ST+A?
NiCo20Cr20MoTi ST+A is NiCo20Cr20MoTi in the ST+A condition — full γ′-hardened service condition after welding and forming; use where room- and high-temperature strength and creep life matter. NiCo20Cr20MoTi ST+A has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,060 MPa (154 ksi) — stronger than 81% of nickel alloy grades. Elongation at break is 25% and the elastic modulus is 221 GPa (32.1 Msi). NiCo20Cr20MoTi ST+A has a density of 8.36 g/cm³ (0.302 lb/in³), heavier than 54% of nickel alloy grades. It melts at 1,300°C (2,372 °F). ST is the default condition FabDigit quotes; ST+A is available on request or by drawing note.
Advantages
- High strength — 620 MPa (89.9 ksi), better than 81% of nickel alloy grades
Limitations
- High embodied carbon — 17 kg CO₂/kg, worse than 96% of nickel alloy grades
NiCo20Cr20MoTi ST+A properties
Typical room-temperature values for NiCo20Cr20MoTi ST+A; 14 are specific to this condition. Other listed values are NiCo20Cr20MoTi reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
NiCo20Cr20MoTi ST+A has a density of 8.36 g/cm³ (0.302 lb/in³), heavier than 54% of nickel alloy grades. It melts at 1,300°C (2,372 °F).
Mechanical15
NiCo20Cr20MoTi ST+A has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,060 MPa (154 ksi) — stronger than 81% of nickel alloy grades. Elongation at break is 25% and the elastic modulus is 221 GPa (32.1 Msi).
Thermal6
NiCo20Cr20MoTi ST+A is rated for continuous service to 850°C (1,562 °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 11.7 µm/m·K (6.5 µin/in·°F).
Electrical3
NiCo20Cr20MoTi ST+A conducts electricity at 1.5 % IACS, better than 59% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 51% of nickel alloy grades.
Sustainability4
Producing a kilogram of NiCo20Cr20MoTi ST+A takes about 235 MJ of energy and emits 17 kg of CO₂ — more than 94% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability8
NiCo20Cr20MoTi ST+A's machinability is not recommended (14/100, worse than 81% of nickel alloy grades); weldability fair (50/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with NiCo20Cr20MoTi ST+A
Is NiCo20Cr20MoTi easy to machine?
Machine in the solution-treated condition where possible: rigid setups, positive-rake carbide or ceramic tooling, low speed and heavy constant feed, flood coolant — work-hardens fast and burns tool edges like other γ′ superalloys.
Can NiCo20Cr20MoTi be welded?
One of the better-weldable γ′ alloys thanks to low Al+Ti — GTAW/EBW/laser with matching 263 or Haynes 263 filler in the solution-treated state, then post-weld solution treat and age; avoid welding in the aged condition.
Can NiCo20Cr20MoTi be formed, bent or molded?
Cold form sheet in the solution-treated condition with generous radii and interstage anneals at ~1150 °C/WQ; hot work 1180–1000 °C, always re-solution treat before ageing.
What surface finishes work on NiCo20Cr20MoTi?
Pickle/blast the tenacious Cr-Co oxide after heat treatment; not anodisable — electropolish, passivate, or apply aluminide/MCrAlY and thermal-barrier coatings for hot-section service.
NiCo20Cr20MoTi 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 |
|---|---|---|
| Co | 19 – 21 | 20 |
| Cr | 19 – 21 | 20 |
| Mo | 5.6 – 6.1 | 5.9 |
| TiAl+Ti held to 2.4–2.8 % for weldability | 1.9 – 2.4 | 2.1 |
| Al | 0.3 – 0.6 | 0.45 |
| C | 0.04 – 0.08 | 0.06 |
| Fe | ≤ 0.7 | 0.3 |
| Mn | ≤ 0.6 | 0.2 |
| Si | ≤ 0.4 | 0.15 |
| Cu | ≤ 0.2 | — |
| B | ≤ 0.01 | — |
| S | ≤ 0.01 | — |
| Ag | ≤ 5×10⁻⁴ | — |
| Pb | ≤ 0 | — |
| Bi | ≤ 1×10⁻⁴ | — |
| Nibalance, typically ~49–52 % | balance | — |
NiCo20Cr20MoTi ST+A — frequently asked
What is NiCo20Cr20MoTi ST+A used for?
NiCo20Cr20MoTi ST+A is typically used for turbine discs, high-temperature fasteners and gas turbine hot-section components. In short: weldable γ′ superalloy; creep strength to 800 °C; sheet-fabrication friendly.
What is the yield strength of NiCo20Cr20MoTi ST+A?
NiCo20Cr20MoTi ST+A has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,060 MPa (154 ksi) — stronger than 81% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is NiCo20Cr20MoTi ST+A easy to machine?
Not especially — machinability is rated not recommended (14/100, worse than 81% of nickel alloy grades). Machine in the solution-treated condition where possible: rigid setups, positive-rake carbide or ceramic tooling, low speed and heavy constant feed, flood coolant — work-hardens fast and burns tool edges like other γ′ superalloys.
Can NiCo20Cr20MoTi ST+A be welded?
With care — weldability is rated fair (50/100). One of the better-weldable γ′ alloys thanks to low Al+Ti — GTAW/EBW/laser with matching 263 or Haynes 263 filler in the solution-treated state, then post-weld solution treat and age; avoid welding in the aged condition.
What surface finishes work on NiCo20Cr20MoTi ST+A?
Pickle/blast the tenacious Cr-Co oxide after heat treatment; not anodisable — electropolish, passivate, or apply aluminide/MCrAlY and thermal-barrier coatings for hot-section service.
Can NiCo20Cr20MoTi ST+A be formed, bent or molded?
Cold form sheet in the solution-treated condition with generous radii and interstage anneals at ~1150 °C/WQ; hot work 1180–1000 °C, always re-solution treat before ageing.
What is the maximum service temperature of NiCo20Cr20MoTi ST+A?
NiCo20Cr20MoTi ST+A is rated for continuous use to about 850°C (1,562 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between NiCo20Cr20MoTi-ST and NiCo20Cr20MoTi-CD?
ST is the default condition — standard as-supplied sheet, plate, bar and ring condition: softest and most formable/weldable, aged after fabrication. CD: cold-worked small bar, wire and strip where higher as-supplied strength and close tolerance are wanted; anneal before heavy forming. Yield strength is 540 MPa in ST versus 800 MPa in CD.
Sources
- Nimonic alloy 263 Technical Data — Special Metals Corporation (2004)
- HAYNES 263 alloy Product Brochure — Haynes International (2020)
- DIN 17742 / 17744 — Nickel wrought alloys with molybdenum and chromium (material no. 2.4650) — DIN (1993)
- AMS 5872 / AMS 5886 — Nickel alloy sheet, strip and bar, 20Co-20Cr-6Mo-2.1Ti — SAE International (2018)
- ASM Specialty Handbook: Heat-Resistant Materials — ASM International (1997)
- (GH4263/Nimonic 263) (2025)
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.