Nickel Alloy G-NiCr28W-CF (Centrifugally cast)
Reinforced grade
EN 2.4879
Choose for radiant tubes, furnace rolls and sleeves where a denser, more directional structure raises creep and rupture strength.
Values for the CF condition
Other G-NiCr28W tempers and conditions
G-NiCr28W is listed in 3 conditions; see the grade overview at G-NiCr28W.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution annealed | Optional treatment used after repair welding or heavy machining to dissolve network carbides and relieve casting stresses, giving slightly higher ductility. | 220 | 430 | 10 | 175 HB | 1.5 % IACS |
FDefault As fabricated | Standard supply condition for furnace fixtures, trays and grids; used directly with no heat treatment. | 240 | 450 | 6 | 190 HB | 1.5 % IACS |
CFThis page Centrifugally cast | Choose for radiant tubes, furnace rolls and sleeves where a denser, more directional structure raises creep and rupture strength. | 260 | 500 | 8 | 195 HB | 1.5 % IACS |
What is G-NiCr28W-CF?
G-NiCr28W-CF is G-NiCr28W in the CF grade — choose for radiant tubes, furnace rolls and sleeves where a denser, more directional structure raises creep and rupture strength. G-NiCr28W-CF has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 84% of nickel alloy grades. Elongation at break is 8% and the elastic modulus is 182 GPa (26.4 Msi). G-NiCr28W-CF has a density of 8.1 g/cm³ (0.293 lb/in³), lighter than 80% of nickel alloy grades. It melts at 1,320°C (2,408 °F). F is the default condition FabDigit quotes; CF is available on request or by drawing note.
Advantages
- High service temperature — 1,150°C (2,102 °F), better than 95% of nickel alloy grades
Limitations
- Hard to polish — 45/100, worse than 99% of nickel alloy grades
- Low fracture toughness — 40 MPa·√m (36.4 ksi·√in), worse than 95% of nickel alloy grades
- Limited ductility — 8%, worse than 87% of nickel alloy grades
- Limited formability — 8/100, worse than 87% of nickel alloy grades
- Low strength — 260 MPa (37.7 ksi), worse than 84% of nickel alloy grades
G-NiCr28W-CF properties
Typical room-temperature values for G-NiCr28W-CF; 20 are specific to this condition. Other listed values are G-NiCr28W reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
G-NiCr28W-CF has a density of 8.1 g/cm³ (0.293 lb/in³), lighter than 80% of nickel alloy grades. It melts at 1,320°C (2,408 °F).
Mechanical15
G-NiCr28W-CF has a yield strength of 260 MPa (37.7 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 84% of nickel alloy grades. Elongation at break is 8% and the elastic modulus is 182 GPa (26.4 Msi).
Thermal5
G-NiCr28W-CF is rated for continuous service to 1,150°C (2,102 °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 15 µm/m·K (8.33 µin/in·°F).
Electrical3
G-NiCr28W-CF conducts electricity at 1.5 % IACS, better than 59% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (76/100), worse than 59% of nickel alloy grades.
Sustainability4
Producing a kilogram of G-NiCr28W-CF takes about 180 MJ of energy and emits 13 kg of CO₂ — more than 69% of nickel alloy grades. Typical recycled content is 45%.
Manufacturability8
G-NiCr28W-CF's machinability is poor (19/100, worse than 52% of nickel alloy grades); weldability fair (35/100); formability not recommended (8/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with G-NiCr28W-CF
Is G-NiCr28W easy to machine?
Difficult: use rigid setups, positive-rake carbide or ceramic inserts, low speed with heavy feed, flood coolant; grind rather than turn where hard interdendritic carbides dominate.
Can G-NiCr28W be welded?
Repair welding only, with matched Ni-Cr-W or Ni-Cr filler, high preheat (200–300 °C) and slow cooling; hot-crack sensitive because of high carbon.
Can G-NiCr28W be formed, bent or molded?
Not cold formable — supplied as sand, investment or centrifugal castings; design generous fillets and uniform sections to avoid hot tears.
What surface finishes work on G-NiCr28W?
Shot blast or pickle to remove casting scale; no anodizing, coatings are rarely needed since the Cr₂O₃ scale is self-protecting.
G-NiCr28W 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 |
|---|---|---|
| Chigh C for carbide strengthening | 0.35 – 0.55 | 0.45 |
| Siaids oxidation/carburization resistance | 1 – 2.5 | 1.6 |
| Mn | ≤ 2 | 1 |
| Cr | 26 – 30 | 28 |
| Wsolid-solution / carbide strengthener | 4 – 6 | 5 |
| Feresidual | ≤ 3 | 1.5 |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Nibalance, approx. 60–66 % | balance | — |
G-NiCr28W-CF — frequently asked
What is G-NiCr28W-CF used for?
G-NiCr28W-CF is typically used for furnace rollers, heat-treatment baskets and radiant tube fittings. In short: carburisation-resistant cast Ni-Cr; highest service temperature, 1150 °C; grinds better than it turns.
What is the yield strength of G-NiCr28W-CF?
G-NiCr28W-CF has a typical yield strength of 260 MPa (37.7 ksi) and a tensile strength of 500 MPa (72.5 ksi) — weaker than 84% of nickel alloy grades. Strength varies by condition: see the 3 listed tempers.
Is G-NiCr28W-CF easy to machine?
Not especially — machinability is rated poor (19/100, worse than 52% of nickel alloy grades). Difficult: use rigid setups, positive-rake carbide or ceramic inserts, low speed with heavy feed, flood coolant; grind rather than turn where hard interdendritic carbides dominate.
Can G-NiCr28W-CF be welded?
With care — weldability is rated fair (35/100). Repair welding only, with matched Ni-Cr-W or Ni-Cr filler, high preheat (200–300 °C) and slow cooling; hot-crack sensitive because of high carbon.
What surface finishes work on G-NiCr28W-CF?
Shot blast or pickle to remove casting scale; no anodizing, coatings are rarely needed since the Cr₂O₃ scale is self-protecting.
Can G-NiCr28W-CF be formed, bent or molded?
Not cold formable — supplied as sand, investment or centrifugal castings; design generous fillets and uniform sections to avoid hot tears.
What is the maximum service temperature of G-NiCr28W-CF?
G-NiCr28W-CF is rated for continuous use to about 1,150°C (2,102 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between G-NiCr28W-F and G-NiCr28W-CF?
F is the default condition — standard supply condition for furnace fixtures, trays and grids; used directly with no heat treatment. CF: choose for radiant tubes, furnace rolls and sleeves where a denser, more directional structure raises creep and rupture strength. Yield strength is 240 MPa in F versus 260 MPa in CF.
Sources
- DIN 17465 — Hitzebeständiger Stahlguss / heat-resistant cast alloys (incl. material 2.4879) — DIN (1990)
- EN 10295 — Heat resistant steel castings — CEN (2002)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (heat-resistant castings) — ASM International (1990)
- ASM Handbook Vol.15 — Casting — ASM International (2008)
- Heat-resistant alloy castings for furnace fixtures (Ni-Cr-W grades) — European/Chinese heat-resistant foundries (2023)
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.