Nickel Alloy G-NiCr50Nb
EN 2.4680
G-NiCr50Nb (2.4680) is a cast nickel-chromium alloy with a niobium addition and a high solidus, part of the DIN/EN cast nickel alloy group.
Reference datasheet — G-NiCr50Nb 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 F condition
G-NiCr50Nb tempers and conditions
G-NiCr50Nb is supplied in 3 conditions, soft to hard. F is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Stress relieved | Choose when thick or complex castings must be machined or welded, to reduce residual stress and cracking risk. | 370 | 560 | 6 | 20 HRC | 1.7 % IACS |
As-welded deposit | Weld-metal condition for cladding boiler supports or repairing castings with matching 50Cr-50Ni-Nb consumables. | 390 | 550 | 4 | 24 HRC | 1.7 % IACS |
FDefault As fabricated | Standard supply condition: static sand or investment castings used directly for tube supports and furnace hardware. | 400 | 580 | 5 | 22 HRC | 1.7 % IACS |
Supply forms, finishes and certifications
Ways G-NiCr50Nb is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CC | Centrifugally cast tube / ring | Surface finish |
What is G-NiCr50Nb?
G-NiCr50Nb (2.4680) is a cast nickel-chromium alloy with a niobium addition and a high solidus, part of the DIN/EN cast nickel alloy group. It is chosen for oxidation resistance and load-bearing capability in sustained service above 1000 °C, with a 1100 °C maximum service temperature, 400 MPa yield and 580 MPa tensile in the as-cast condition, and is supplied as sand, investment or centrifugal castings. Ductility is low (5 % elongation, 240 HB) and the machinability score of 12 makes the hard α-Cr phase a grinding and EDM job. Where high-temperature strength matters more than chromium content, G-NiCr28W is the easier cast alternative. G-NiCr50Nb has a density of 7.9 g/cm³ (0.285 lb/in³), lighter than 92% of nickel alloy grades. It melts at 1,330°C (2,426 °F). G-NiCr50Nb has a yield strength of 400 MPa (58 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 5% and the elastic modulus is 200 GPa (29 Msi).
What is G-NiCr50Nb used for?
- gas turbine casing components
- furnace fittings
- high-temperature valve bodies
Advantages
- High service temperature — 1,100°C (2,012 °F), better than 88% of nickel alloy grades
- Low embodied carbon — 10.5 kg CO₂/kg, better than 88% of nickel alloy grades
- High electrical conductivity — 1.7 % IACS, better than 76% of nickel alloy grades
Limitations
- Low fracture toughness — 40 MPa·√m (36.4 ksi·√in), worse than 95% of nickel alloy grades
- Hard to polish — 55/100, worse than 95% of nickel alloy grades
- Limited ductility — 5%, worse than 93% of nickel alloy grades
- Limited formability — 5/100, worse than 91% of nickel alloy grades
- Difficult to weld — 25/100, worse than 82% of nickel alloy grades
G-NiCr50Nb properties
Typical room-temperature values for G-NiCr50Nb-F; bars are the position among nickel alloy grades.
Physical3
G-NiCr50Nb has a density of 7.9 g/cm³ (0.285 lb/in³), lighter than 92% of nickel alloy grades. It melts at 1,330°C (2,426 °F).
Mechanical17
G-NiCr50Nb has a yield strength of 400 MPa (58 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 5% and the elastic modulus is 200 GPa (29 Msi).
Thermal5
G-NiCr50Nb is rated for continuous service to 1,100°C (2,012 °F). It conducts heat at 13.5 W/m·K (7.8 BTU/hr·ft·°F), better than 73% of nickel alloy grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
G-NiCr50Nb conducts electricity at 1.7 % IACS, better than 76% of nickel alloy grades.
Chemical & Environmental2
Corrosion resistance is excellent (85/100), better than 74% of nickel alloy grades.
Sustainability3
Producing a kilogram of G-NiCr50Nb takes about 145 MJ of energy and emits 10.5 kg of CO₂ — less than 77% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability8
G-NiCr50Nb's machinability is not recommended (12/100, worse than 86% of nickel alloy grades); weldability poor (25/100); formability not recommended (5/100).
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. G-NiCr50Nb is highlighted; hover a dot for its name, or open the interactive family chart.
Working with G-NiCr50Nb
Is G-NiCr50Nb easy to machine?
Very difficult — rigid setups, negative-rake carbide or ceramic inserts at low speed with heavy feed, or grind/EDM the hard α-Cr phase; expect short tool life.
Can G-NiCr50Nb be welded?
Weld only with matching 50Cr-50Ni-Nb filler, low heat input, preheat/interpass control and post-weld stress relief; highly sensitive to hot and reheat cracking.
Can G-NiCr50Nb be formed, bent or molded?
Not cold formable — produce by sand, investment or centrifugal casting to near-net shape with generous risering to avoid shrinkage porosity.
G-NiCr50Nb 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 |
|---|---|---|
| Crduplex α-Cr + Ni matrix | 48 – 52 | 50 |
| Nbcarbide former / strengthener | 1.2 – 1.8 | 1.5 |
| C | ≤ 0.1 | 0.06 |
| Si | ≤ 0.5 | 0.3 |
| Mn | ≤ 0.5 | 0.2 |
| Fe | ≤ 1 | 0.5 |
| Ti | ≤ 0.5 | |
| Al | ≤ 0.3 | |
| S | ≤ 0.02 | |
| P | ≤ 0.02 | |
| Nibalance, nominally ~47–48 % | balance |
What surface finishes work on G-NiCr50Nb?
Grit blast and grind or belt-polish; the chromia film is self-protecting so no coating is normally applied, and the alloy cannot be anodised.
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 G-NiCr50Nb in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 2.4680
How much does G-NiCr50Nb cost?
G-NiCr50Nb 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.
G-NiCr50Nb — frequently asked
What is G-NiCr50Nb used for?
G-NiCr50Nb is typically used for gas turbine casing components, furnace fittings and high-temperature valve bodies. In short: 50Cr-50Ni oxidation resistance; hardest cast Ni-Cr grade; grind-and-EDM material.
What is the yield strength of G-NiCr50Nb?
G-NiCr50Nb has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 56% of nickel alloy grades. Strength varies by condition: see the 3 listed tempers.
Is G-NiCr50Nb easy to machine?
Not especially — machinability is rated not recommended (12/100, worse than 86% of nickel alloy grades). Very difficult — rigid setups, negative-rake carbide or ceramic inserts at low speed with heavy feed, or grind/EDM the hard α-Cr phase; expect short tool life.
Can G-NiCr50Nb be welded?
Not readily — weldability is rated poor (25/100). Weld only with matching 50Cr-50Ni-Nb filler, low heat input, preheat/interpass control and post-weld stress relief; highly sensitive to hot and reheat cracking.
What surface finishes work on G-NiCr50Nb?
Grit blast and grind or belt-polish; the chromia film is self-protecting so no coating is normally applied, and the alloy cannot be anodised.
Can G-NiCr50Nb be formed, bent or molded?
Not cold formable — produce by sand, investment or centrifugal casting to near-net shape with generous risering to avoid shrinkage porosity.
What is the maximum service temperature of G-NiCr50Nb?
G-NiCr50Nb is rated for continuous use to about 1,100°C (2,012 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between G-NiCr50Nb-F and G-NiCr50Nb-SR?
F is the default condition — standard supply condition: static sand or investment castings used directly for tube supports and furnace hardware. SR: choose when thick or complex castings must be machined or welded, to reduce residual stress and cracking risk. Yield strength is 400 MPa in F versus 370 MPa in SR.
How much does G-NiCr50Nb cost?
G-NiCr50Nb 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
- DIN 17465 — Heat resistant steel castings (G-NiCr50Nb, 2.4680) — DIN (1988)
- EN 10295 — Heat resistant steel castings — CEN (2002)
- INCONEL alloy 657 (50Cr-50Ni-Nb) technical bulletin — Special Metals Corporation (2004)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
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.