Nickel Alloy GX40NiCrNb45-35
EN 1.4889
GX40NiCrNb45-35 (1.4889) is a niobium-stabilised 45Ni-35Cr high-carbon casting alloy produced mainly as centrifugally cast tube, together with sand and investment castings, in as-cast, solution-annealed and aged conditions.
Reference datasheet — GX40NiCrNb45-35 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.
GX40NiCrNb45-35 tempers and conditions
GX40NiCrNb45-35 is supplied in 3 conditions, soft to hard.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution/diffusion annealed | Use solution/diffusion annealing near 1150 °C with rapid cooling on weldments and complex castings to remove segregation and reach 14 % elongation, at some loss of initial creep strength. | 225 | 455 | 14 | 160 HB | 1.7 % IACS |
Statically (sand/investment) cast, as-cast | Choose static sand or investment casting in the as-cast state for furnace fittings, elbows and supports; equiaxed grains match room-temperature strength but creep life is lower (1050 °C). | 230 | 450 | 8 | 170 HB | 1.7 % IACS |
Thermally aged / service-exposed | Use the thermally aged or service-exposed state (≈1000 °C, over 1000 h) to assess remaining tube life: secondary carbide and sigma precipitation cut elongation to 2.5 % and raise hardness to 210 HB. | 300 | 460 | 2.5 | 210 HB | 1.8 % IACS |
Supply forms, finishes and certifications
Ways GX40NiCrNb45-35 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CCDefault | Centrifugally cast, as-cast | Surface finish |
What is GX40NiCrNb45-35?
GX40NiCrNb45-35 (1.4889) is a niobium-stabilised 45Ni-35Cr high-carbon casting alloy produced mainly as centrifugally cast tube, together with sand and investment castings, in as-cast, solution-annealed and aged conditions. Niobium carbides give the creep and carburisation resistance needed in petrochemical cracking and reforming service, with a maximum service temperature of 1100 °C. Elongation is 10 %, machining is abrasive (rated 18), and welding of aged in-service material requires removal of the carburised layer first. Where oxidation resistance above 1100 °C governs, GX50NiCrCoW35-25-15-5 is the alternative. GX40NiCrNb45-35 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). GX40NiCrNb45-35 has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 90% of nickel alloy grades. Elongation at break is 10% and the elastic modulus is 160 GPa (23.2 Msi).
What is GX40NiCrNb45-35 used for?
- ethylene pyrolysis furnace tubes
- radiant coil supports
- reformer fittings
Advantages
- Low embodied carbon — 7 kg CO₂/kg, better than 98% of nickel alloy grades
- High service temperature — 1,100°C (2,012 °F), better than 88% of nickel alloy grades
- High electrical conductivity — 1.7 % IACS, better than 76% of nickel alloy grades
Limitations
- Hard to polish — 45/100, worse than 99% of nickel alloy grades
- Low stiffness — 160 GPa (23.2 Msi), worse than 92% of nickel alloy grades
- Limited formability — 5/100, worse than 91% of nickel alloy grades
- Low strength — 240 MPa (34.8 ksi), worse than 90% of nickel alloy grades
- Limited ductility — 10%, worse than 85% of nickel alloy grades
GX40NiCrNb45-35 properties
Typical room-temperature values; bars are the position among nickel alloy grades.
Physical3
GX40NiCrNb45-35 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).
Mechanical15
GX40NiCrNb45-35 has a yield strength of 240 MPa (34.8 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 90% of nickel alloy grades. Elongation at break is 10% and the elastic modulus is 160 GPa (23.2 Msi).
Thermal6
GX40NiCrNb45-35 is rated for continuous service to 1,100°C (2,012 °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
GX40NiCrNb45-35 conducts electricity at 1.7 % IACS, better than 76% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), worse than 71% of nickel alloy grades.
Sustainability4
Producing a kilogram of GX40NiCrNb45-35 takes about 95 MJ of energy and emits 7 kg of CO₂ — less than 97% of nickel alloy grades. Typical recycled content is 60%.
Manufacturability8
GX40NiCrNb45-35's machinability is poor (18/100, worse than 61% of nickel alloy grades); weldability fair (45/100); 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. GX40NiCrNb45-35 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with GX40NiCrNb45-35
Is GX40NiCrNb45-35 easy to machine?
Difficult: the high-carbon eutectic carbides abrade tooling, so use carbide or ceramic inserts, low speed with heavy feed, rigid clamping and generous coolant. Keep the tool cutting under the work-hardened layer.
Can GX40NiCrNb45-35 be welded?
GTAW and SMAW with matching 45Ni-35Cr-Nb filler, 100–200 °C preheat, low heat input and interpass temperature control. On aged tubes taken out of service, machine the carburised layer away before welding.
Can GX40NiCrNb45-35 be formed, bent or molded?
Shaped by casting only, as centrifugally cast tube or sand and investment castings; cold bending and cold forming are not possible. Hot straightening must be done above 1050 °C followed by slow cooling.
GX40NiCrNb45-35 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 carbon provides carbide strengthening | 0.3 – 0.5 | 0.4 |
| Siimproves carburization resistance | ≤ 2 | 1.3 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.04 | |
| S | ≤ 0.03 | |
| Cr | 33 – 37 | 35 |
| Ni | 43 – 48 | 45 |
| Nbstabilizes MC carbides | 1.2 – 1.8 | 1.5 |
| Fe | balance |
What surface finishes work on GX40NiCrNb45-35?
Supplied with the bore bored and the outside diameter turned. Shot blasting, pickling or aluminising can be applied to improve coking and oxidation resistance; anodising does not apply.
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 GX40NiCrNb45-35 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.4889
How much does GX40NiCrNb45-35 cost?
GX40NiCrNb45-35 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.
GX40NiCrNb45-35 — frequently asked
What is GX40NiCrNb45-35 used for?
GX40NiCrNb45-35 is typically used for ethylene pyrolysis furnace tubes, radiant coil supports and reformer fittings. In short: carburisation-resistant cast tube; nb-stabilised 45/35 casting; petrochemical furnace grade.
What is the yield strength of GX40NiCrNb45-35?
GX40NiCrNb45-35 has a typical yield strength of 240 MPa (34.8 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 90% of nickel alloy grades. Strength varies by condition: see the 3 listed tempers.
Is GX40NiCrNb45-35 easy to machine?
Not especially — machinability is rated poor (18/100, worse than 61% of nickel alloy grades). Difficult: the high-carbon eutectic carbides abrade tooling, so use carbide or ceramic inserts, low speed with heavy feed, rigid clamping and generous coolant. Keep the tool cutting under the work-hardened layer.
Can GX40NiCrNb45-35 be welded?
With care — weldability is rated fair (45/100). GTAW and SMAW with matching 45Ni-35Cr-Nb filler, 100–200 °C preheat, low heat input and interpass temperature control. On aged tubes taken out of service, machine the carburised layer away before welding.
What surface finishes work on GX40NiCrNb45-35?
Supplied with the bore bored and the outside diameter turned. Shot blasting, pickling or aluminising can be applied to improve coking and oxidation resistance; anodising does not apply.
Can GX40NiCrNb45-35 be formed, bent or molded?
Shaped by casting only, as centrifugally cast tube or sand and investment castings; cold bending and cold forming are not possible. Hot straightening must be done above 1050 °C followed by slow cooling.
What is the maximum service temperature of GX40NiCrNb45-35?
GX40NiCrNb45-35 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.
How much does GX40NiCrNb45-35 cost?
GX40NiCrNb45-35 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
- EN 10295 — Heat resistant steel castings — CEN (2002)
- DIN 17465 / Werkstoff-Nr. 1.4889 (historical) — DIN (1988)
- ASM Handbook Vol.1 — Heat-Resistant Castings (HK/HP/45-35 class) — 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.