Nickel Alloy GX50NiCrCoW35-25-15-5-SR (Stress relieved)
Heat-treated state
EN 1.4869
Optional post-casting or post-weld anneal (typically ~1050–1150 °C, air cool) to relieve casting/welding stresses in large fabricated furnace assemblies.
Values for the SR condition
Other GX50NiCrCoW35-25-15-5 tempers and conditions
GX50NiCrCoW35-25-15-5 is listed in 2 conditions; see the grade overview at GX50NiCrCoW35-25-15-5.
- SR
- AC
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SRThis page Stress relieved | Optional post-casting or post-weld anneal (typically ~1050–1150 °C, air cool) to relieve casting/welding stresses in large fabricated furnace assemblies. | 270 | 470 | 8 | 195 HB | 1.8 % IACS |
ACDefault Spheroidize annealed | Default supply condition for shaped furnace fittings, trays, muffles and hangers — used as-cast without heat treatment. | 290 | 490 | 5 | 205 HB | — |
What is GX50NiCrCoW35-25-15-5-SR?
GX50NiCrCoW35-25-15-5-SR is GX50NiCrCoW35-25-15-5 heat treated to SR — optional post-casting or post-weld anneal (typically ~1050–1150 °C, air cool) to relieve casting/welding stresses in large fabricated furnace assemblies. GX50NiCrCoW35-25-15-5-SR has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 84% of nickel alloy grades. Elongation at break is 8% and the elastic modulus is 185 GPa (26.8 Msi). GX50NiCrCoW35-25-15-5-SR has a density of 8 g/cm³ (0.289 lb/in³), lighter than 85% of nickel alloy grades. It melts at 1,310°C (2,390 °F). AC is the default condition FabDigit quotes; SR is available on request or by drawing note.
Advantages
- High service temperature — 1,200°C (2,192 °F), better than 99% of nickel alloy grades
- High electrical conductivity — 1.8 % IACS, better than 81% of nickel alloy grades
Limitations
- Hard to polish — 45/100, worse than 99% of nickel alloy grades
- Limited formability — 6/100, worse than 88% of nickel alloy grades
- Limited ductility — 8%, worse than 87% of nickel alloy grades
- Low strength — 270 MPa (39.2 ksi), worse than 84% of nickel alloy grades
- Difficult to weld — 30/100, worse than 78% of nickel alloy grades
GX50NiCrCoW35-25-15-5-SR properties
Typical room-temperature values for GX50NiCrCoW35-25-15-5-SR; 22 are specific to this condition. Other listed values are GX50NiCrCoW35-25-15-5 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
GX50NiCrCoW35-25-15-5-SR has a density of 8 g/cm³ (0.289 lb/in³), lighter than 85% of nickel alloy grades. It melts at 1,310°C (2,390 °F).
Mechanical14
GX50NiCrCoW35-25-15-5-SR has a yield strength of 270 MPa (39.2 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 84% of nickel alloy grades. Elongation at break is 8% and the elastic modulus is 185 GPa (26.8 Msi).
Thermal6
GX50NiCrCoW35-25-15-5-SR is rated for continuous service to 1,200°C (2,192 °F). It conducts heat at 12.8 W/m·K (7.4 BTU/hr·ft·°F), better than 70% of nickel alloy grades. Thermal expansion is 15.5 µm/m·K (8.61 µin/in·°F).
Electrical3
GX50NiCrCoW35-25-15-5-SR conducts electricity at 1.8 % IACS, better than 81% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (74/100), worse than 66% of nickel alloy grades.
Sustainability4
Producing a kilogram of GX50NiCrCoW35-25-15-5-SR takes about 145 MJ of energy and emits 11.5 kg of CO₂ — less than 77% of nickel alloy grades. Typical recycled content is 50%.
Manufacturability8
GX50NiCrCoW35-25-15-5-SR's machinability is poor (18/100, worse than 61% of nickel alloy grades); weldability poor (30/100); formability not recommended (6/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with GX50NiCrCoW35-25-15-5-SR
Is GX50NiCrCoW35-25-15-5 easy to machine?
Very difficult: rigid setups, negative-rake carbide or ceramic inserts, low speed with heavy positive feed, flood coolant; grinding is often preferred for finish surfaces.
Can GX50NiCrCoW35-25-15-5 be welded?
Weld only with preheat 200–300 °C, low heat input and matching Ni-Cr-Co-W or 25-35 Nb filler; high carbon makes it hot-crack sensitive, and re-weld of long-serviced parts usually needs solution annealing first.
Can GX50NiCrCoW35-25-15-5 be formed, bent or molded?
Cast-only alloy — sand/investment casting for shaped fittings, centrifugal casting for tubes; use generous fillets, controlled section changes and slow cooling to avoid hot tears.
What surface finishes work on GX50NiCrCoW35-25-15-5?
Normally supplied shot-blasted or pickled with the as-cast scale removed; no anodising or decorative plating — a protective Cr₂O₃ scale forms in service and should not be removed between campaigns.
GX50NiCrCoW35-25-15-5 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 / creep resistance | 0.4 – 0.6 | 0.5 |
| Siaids scaling resistance and casting fluidity | ≤ 2 | 1.2 |
| Mn | ≤ 2 | 1 |
| Cr | 24 – 26 | 25 |
| Ni | 33 – 37 | 35 |
| Co | 14 – 16 | 15 |
| Wsolid-solution and carbide strengthener | 4 – 6 | 5 |
| P | ≤ 0.04 | — |
| S | ≤ 0.03 | — |
| Febalance, ≈17–20 % | balance | — |
GX50NiCrCoW35-25-15-5-SR — frequently asked
What is GX50NiCrCoW35-25-15-5-SR used for?
GX50NiCrCoW35-25-15-5-SR is typically used for furnace grates and grate bars, kiln fittings, heat-treatment fixtures and radiant tube supports. In short: 1200 °C cast heat-resistant grade; co and W strengthened; cast-only, low ductility.
What is the yield strength of GX50NiCrCoW35-25-15-5-SR?
GX50NiCrCoW35-25-15-5-SR has a typical yield strength of 270 MPa (39.2 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 84% of nickel alloy grades. Strength varies by condition: see the 2 listed tempers.
Is GX50NiCrCoW35-25-15-5-SR easy to machine?
Not especially — machinability is rated poor (18/100, worse than 61% of nickel alloy grades). Very difficult: rigid setups, negative-rake carbide or ceramic inserts, low speed with heavy positive feed, flood coolant; grinding is often preferred for finish surfaces.
Can GX50NiCrCoW35-25-15-5-SR be welded?
Not readily — weldability is rated poor (30/100). Weld only with preheat 200–300 °C, low heat input and matching Ni-Cr-Co-W or 25-35 Nb filler; high carbon makes it hot-crack sensitive, and re-weld of long-serviced parts usually needs solution annealing first.
What surface finishes work on GX50NiCrCoW35-25-15-5-SR?
Normally supplied shot-blasted or pickled with the as-cast scale removed; no anodising or decorative plating — a protective Cr₂O₃ scale forms in service and should not be removed between campaigns.
Can GX50NiCrCoW35-25-15-5-SR be formed, bent or molded?
Cast-only alloy — sand/investment casting for shaped fittings, centrifugal casting for tubes; use generous fillets, controlled section changes and slow cooling to avoid hot tears.
What is the maximum service temperature of GX50NiCrCoW35-25-15-5-SR?
GX50NiCrCoW35-25-15-5-SR 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 GX50NiCrCoW35-25-15-5-AC and GX50NiCrCoW35-25-15-5-SR?
AC is the default condition — default supply condition for shaped furnace fittings, trays, muffles and hangers — used as-cast without heat treatment. SR: optional post-casting or post-weld anneal (typically ~1050–1150 °C, air cool) to relieve casting/welding stresses in large fabricated furnace assemblies. Yield strength is 290 MPa in AC versus 270 MPa in SR.
Sources
- 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)
- Heat-resistant cast alloys for furnace fittings and radiant tubes — Cronite / Wolfensberger-type foundry datasheets (2022)
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.