Nickel Alloy 601GC-ANN (Annealed)
Heat-treated state · default condition
UNS N06650 · EN 2.4850 · also Nicrofer 6025 GT
Standard stock condition for combustor liners and furnace parts; best combination of ductility, formability and weldability.
Values for the ANN condition
Other 601GC tempers and conditions
601GC is listed in 5 conditions; see the grade overview at 601GC.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
High-temperature (coarse-grain) solution anneal | Anneal near 1150–1180 °C to coarsen grain for maximum creep-rupture life in continuously fired combustion hardware; sacrifices room-temperature strength. | 270 | 640 | 50 | 155 HB | 1.5 % IACS |
Hot-worked and annealed | Pick for thick sections, forged rings and machined furnace hardware where slightly coarser grain and lower strength are acceptable. | 290 | 655 | 45 | 160 HB | 1.5 % IACS |
ANNDefaultThis page Annealed | Standard stock condition for combustor liners and furnace parts; best combination of ductility, formability and weldability. | 310 | 690 | 48 | 170 HB | — |
As-welded deposit | Represents all-weld-metal / cross-weld properties when no post-weld anneal is applied, typical of fabricated liners and ducting. | 370 | 640 | 33 | 185 HB | 1.5 % IACS |
Cold drawn | Use when higher room-temperature strength, straightness and better chip control are needed; not for service above ~600 °C without re-anneal. | 550 | 830 | 25 | 22 HRC | — |
What is 601GC-ANN?
601GC-ANN is 601GC heat treated to ANN — standard stock condition for combustor liners and furnace parts; best combination of ductility, formability and weldability. 601GC-ANN has a yield strength of 310 MPa (45 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 74% of nickel alloy grades. Elongation at break is 48% and the elastic modulus is 206 GPa (29.9 Msi). 601GC-ANN has a density of 8.11 g/cm³ (0.293 lb/in³), lighter than 77% of nickel alloy grades. It melts at 1,360°C (2,480 °F).
Advantages
- High service temperature — 1,200°C (2,192 °F), better than 99% of nickel alloy grades
- Forms and bends easily — 80/100, better than 91% of nickel alloy grades
- Ductile — tolerates forming and impact — 48%, better than 83% of nickel alloy grades
- Readily welded — 85/100, better than 83% of nickel alloy grades
601GC-ANN properties
Typical room-temperature values for 601GC-ANN; 11 are specific to this condition. Other listed values are 601GC reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
601GC-ANN has a density of 8.11 g/cm³ (0.293 lb/in³), lighter than 77% of nickel alloy grades. It melts at 1,360°C (2,480 °F).
Mechanical14
601GC-ANN has a yield strength of 310 MPa (45 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 74% of nickel alloy grades. Elongation at break is 48% and the elastic modulus is 206 GPa (29.9 Msi).
Thermal6
601GC-ANN is rated for continuous service to 1,200°C (2,192 °F). It conducts heat at 11.3 W/m·K (6.53 BTU/hr·ft·°F), better than 50% of nickel alloy grades. Thermal expansion is 13.8 µm/m·K (7.64 µin/in·°F).
Electrical3
601GC-ANN conducts electricity at 1.5 % IACS, better than 50% 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 601GC-ANN takes about 150 MJ of energy and emits 12.5 kg of CO₂ — less than 68% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability8
601GC-ANN's machinability is poor (22/100, better than 64% of nickel alloy grades); weldability excellent (85/100); formability very good (80/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 601GC-ANN
Is 601GC easy to machine?
Machine like a gummy austenitic superalloy: rigid setup, positive-rake sharp carbide or ceramic tooling, heavy depth of cut, low speed (≈15–25 m/min carbide) and flood coolant to avoid work-hardened glazing.
Can 601GC be welded?
Readily welded by GTAW/GMAW/SMAW with matching alloy 601 or ERNiCrFe/ERNiCrCoMo fillers; no preheat or PWHT normally required, keep interpass low and use clean, sulphur-free surfaces because of the Al content.
Can 601GC be formed, bent or molded?
Excellent cold formability but high work-hardening rate — allow extra power, generous radii and intermediate anneals at 1120–1180 °C followed by rapid cooling; hot work 1200–950 °C.
What surface finishes work on 601GC?
Pickle in HNO₃-HF or grit blast plus pickling to remove the tenacious Al-Cr oxide before welding or brazing; bright-annealed or abrasive-polished finishes are common, no anodising or plating typical.
601GC 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 |
|---|---|---|
| NiNi + Co | 58 – 63 | 60.5 |
| Cr | 21 – 25 | 23 |
| AlGC version holds Al in a narrow band for a stable alumina-rich scale | 1 – 1.7 | 1.35 |
| CGC version restricts C for improved ductility/thermal fatigue | ≤ 0.1 | 0.05 |
| Mn | ≤ 1 | 0.3 |
| Sicontrolled low in GC grade | ≤ 0.5 | 0.25 |
| Cu | ≤ 1 | 0.1 |
| S | ≤ 0.02 | 0 |
| Febalance, typically 13–15 % | balance | — |
601GC-ANN — frequently asked
What is 601GC-ANN used for?
601GC-ANN is typically used for gas turbine combustion liners, transition pieces, furnace hardware and high-temperature oxidation-resistant fixtures. In short: turbine-grade Alloy 601; 1200 °C service capability; formable and readily welded.
What is the yield strength of 601GC-ANN?
601GC-ANN has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 74% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is 601GC-ANN easy to machine?
Not especially — machinability is rated poor (22/100, better than 64% of nickel alloy grades). Machine like a gummy austenitic superalloy: rigid setup, positive-rake sharp carbide or ceramic tooling, heavy depth of cut, low speed (≈15–25 m/min carbide) and flood coolant to avoid work-hardened glazing.
Can 601GC-ANN be welded?
Yes — weldability is rated excellent (85/100). Readily welded by GTAW/GMAW/SMAW with matching alloy 601 or ERNiCrFe/ERNiCrCoMo fillers; no preheat or PWHT normally required, keep interpass low and use clean, sulphur-free surfaces because of the Al content.
What surface finishes work on 601GC-ANN?
Pickle in HNO₃-HF or grit blast plus pickling to remove the tenacious Al-Cr oxide before welding or brazing; bright-annealed or abrasive-polished finishes are common, no anodising or plating typical.
Can 601GC-ANN be formed, bent or molded?
Excellent cold formability but high work-hardening rate — allow extra power, generous radii and intermediate anneals at 1120–1180 °C followed by rapid cooling; hot work 1200–950 °C.
What is the maximum service temperature of 601GC-ANN?
601GC-ANN is rated for continuous use to about 1,200°C (2,192 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 601GC-ANN and 601GC-CD?
ANN is the default condition — standard stock condition for combustor liners and furnace parts; best combination of ductility, formability and weldability. CD: use when higher room-temperature strength, straightness and better chip control are needed; not for service above ~600 °C without re-anneal. Yield strength is 310 MPa in ANN versus 550 MPa in CD.
Sources
- INCONEL alloy 601 / 601GC technical bulletin — Special Metals Corporation (2008)
- ASTM B168 — Nickel-Chromium-Iron Alloy Plate, Sheet and Strip — ASTM International (2019)
- ASTM B166 — Nickel-Chromium-Iron Alloy Rod, Bar and Wire — ASTM International (2019)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
- VdTÜV / DIN material sheet for 2.4851 NiCr23Fe (alloy 601) — DIN/VdTÜV (2015)
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.