Nickel Alloy G-NiCr28W-SA (Solution annealed)
Heat-treated state
EN 2.4879
Optional treatment used after repair welding or heavy machining to dissolve network carbides and relieve casting stresses, giving slightly higher ductility.
Values for the SA 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 |
|---|---|---|---|---|---|---|
SAThis page 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 |
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-SA?
G-NiCr28W-SA is G-NiCr28W heat treated to SA — optional treatment used after repair welding or heavy machining to dissolve network carbides and relieve casting stresses, giving slightly higher ductility. G-NiCr28W-SA has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 430 MPa (62.4 ksi) — weaker than 93% of nickel alloy grades. Elongation at break is 10% and the elastic modulus is 180 GPa (26.1 Msi). G-NiCr28W-SA 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; SA 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
- Low strength — 220 MPa (31.9 ksi), worse than 93% of nickel alloy grades
- Low stiffness — 180 GPa (26.1 Msi), worse than 85% of nickel alloy grades
- Limited ductility — 10%, worse than 85% of nickel alloy grades
G-NiCr28W-SA properties
Typical room-temperature values for G-NiCr28W-SA; 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-SA 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-SA has a yield strength of 220 MPa (31.9 ksi) and a tensile strength of 430 MPa (62.4 ksi) — weaker than 93% of nickel alloy grades. Elongation at break is 10% and the elastic modulus is 180 GPa (26.1 Msi).
Thermal5
G-NiCr28W-SA 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-SA 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 G-NiCr28W-SA 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-SA's machinability is poor (24/100, better than 71% of nickel alloy grades); weldability fair (40/100); formability not recommended (12/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with G-NiCr28W-SA
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-SA — frequently asked
What is G-NiCr28W-SA used for?
G-NiCr28W-SA 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-SA?
G-NiCr28W-SA has a typical yield strength of 220 MPa (31.9 ksi) and a tensile strength of 430 MPa (62.4 ksi) — weaker than 93% of nickel alloy grades. Strength varies by condition: see the 3 listed tempers.
Is G-NiCr28W-SA easy to machine?
Not especially — machinability is rated poor (24/100, better than 71% 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-SA be welded?
With care — weldability is rated fair (40/100). 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-SA?
Shot blast or pickle to remove casting scale; no anodizing, coatings are rarely needed since the Cr₂O₃ scale is self-protecting.
Can G-NiCr28W-SA 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-SA?
G-NiCr28W-SA 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.