Nickel Alloy 601GC
UNS N06650 · EN 2.4850 · also Nicrofer 6025 GT
601GC (UNS N06650, also cross-referenced to N06601, 2.4850, Nicrofer 6025 GT) is a gas-turbine grade of Alloy 601 with tighter compositional control for improved high-temperature oxidation resistance and ductility in combustion environments.
Reference datasheet — 601GC is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the ANN condition
601GC tempers and conditions
601GC is supplied in 5 conditions, soft to hard. ANN is the default FabDigit quotes; the values on this page are for it.
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 |
ANNDefault 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?
601GC (UNS N06650, also cross-referenced to N06601, 2.4850, Nicrofer 6025 GT) is a gas-turbine grade of Alloy 601 with tighter compositional control for improved high-temperature oxidation resistance and ductility in combustion environments. It is used for hot-section and furnace hardware in ANN, HRA, SA-CG, CD and AW conditions, mainly as sheet, plate, strip and welded assemblies. Annealed properties are 310 MPa yield, 690 MPa tensile, 48% elongation and 170 HB (85 HRB), with a maximum service temperature of 1200 °C. Weldability (85) and formability (80) are good, but machining is slow and the alloy carries a superalloy price; standard Alloy 601 is the nearest lower-cost option. 601GC 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). 601GC 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).
What is 601GC used for?
- gas turbine combustion liners
- transition pieces
- furnace hardware
- high-temperature oxidation-resistant fixtures
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 properties
Typical room-temperature values for 601GC-ANN; bars are the position among nickel alloy grades.
Physical3
601GC 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 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 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 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 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'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. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. 601GC is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 601GC
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.
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 |
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.
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy 601GC in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N06650
- EN / DIN / Werkstoff-Nr.
- 2.4850
- Trade names
- Nicrofer 6025 GT
- Also called
- Nicrofer 6025GT
- Similar grades
- N06601
How much does 601GC cost?
601GC is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
601GC — frequently asked
What is 601GC used for?
601GC 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?
601GC 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 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 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?
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 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?
601GC 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.
How much does 601GC cost?
601GC is a high-cost nickel alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.