Nickel Alloy 2.4889 Annealed
Temper · default condition
EN 2.4889
Standard stocked condition for winding heating coils and forming elements — maximum ductility, stable resistance.
Values for the Annealed condition
Other 2.4889 tempers and conditions
2.4889 is listed in 4 conditions; see the grade overview at 2.4889.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot rolled + annealed bar / rod | Heavy-section bar and rod for cast-in heaters, electrodes and machined fixtures rather than fine wire. | 350 | 720 | 35 | 160 HB | 1.5 % IACS |
AnnealedDefaultThis page Annealed (soft, bright-annealed wire / strip) | Standard stocked condition for winding heating coils and forming elements — maximum ductility, stable resistance. | 400 | 760 | 30 | 170 HB | — |
Half hard | Choose when coils must hold shape during handling but still be bendable; intermediate strength. | 700 | 950 | 15 | 235 HB | 1.5 % IACS |
Hardened | Cold-drawn wire for stiff straight elements, resistor windings and cut-to-length parts; anneals out at first heat-up. | 950 | 1,150 | 4 | 32 HRC | 1.4 % IACS |
What is 2.4889 Annealed?
2.4889 Annealed is 2.4889 in the Annealed temper — standard stocked condition for winding heating coils and forming elements — maximum ductility, stable resistance. 2.4889 Annealed has a yield strength of 400 MPa (58 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 30% and the elastic modulus is 216 GPa (31.3 Msi). 2.4889 Annealed has a density of 8.12 g/cm³ (0.293 lb/in³), lighter than 76% of nickel alloy grades. It melts at 1,380°C (2,516 °F).
Advantages
- High service temperature — 1,250°C (2,282 °F), better than 100% of nickel alloy grades
- Forms and bends easily — 80/100, better than 91% of nickel alloy grades
- Conducts heat well — 14 W/m·K (8.09 BTU/hr·ft·°F), better than 77% of nickel alloy grades
Limitations
- Needs corrosion protection — 68/100, worse than 82% of nickel alloy grades
2.4889 Annealed properties
Typical room-temperature values for 2.4889 Annealed; 10 are specific to this condition. Other listed values are 2.4889 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
2.4889 Annealed has a density of 8.12 g/cm³ (0.293 lb/in³), lighter than 76% of nickel alloy grades. It melts at 1,380°C (2,516 °F).
Mechanical13
2.4889 Annealed has a yield strength of 400 MPa (58 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 56% of nickel alloy grades. Elongation at break is 30% and the elastic modulus is 216 GPa (31.3 Msi).
Thermal6
2.4889 Annealed is rated for continuous service to 1,250°C (2,282 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), better than 77% of nickel alloy grades. Thermal expansion is 13.5 µm/m·K (7.5 µin/in·°F).
Electrical3
2.4889 Annealed conducts electricity at 1.5 % IACS, better than 51% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), worse than 82% of nickel alloy grades.
Sustainability4
Producing a kilogram of 2.4889 Annealed takes about 160 MJ of energy and emits 12 kg of CO₂ — less than 53% of nickel alloy grades. Typical recycled content is 30%.
Manufacturability8
2.4889 Annealed's machinability is poor (22/100, better than 64% of nickel alloy grades); weldability good (65/100); formability very good (80/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 2.4889 Annealed
Is 2.4889 easy to machine?
Gummy and strongly work-hardening — use rigid setups, sharp positive-rake carbide, low speed (15–25 m/min), heavy positive feed and flood coolant; avoid dwelling.
Can 2.4889 be welded?
Joined mainly by resistance/spot, TIG or plasma with matching Ni-Cr filler; keep heat input low, clean off oxide first, and avoid sulphur-bearing marking pens or lubricants.
Can 2.4889 be formed, bent or molded?
Excellent cold drawability and coilability in the annealed state; heavy cold work raises strength fast, so interstage anneals at 950–1050 °C with rapid cooling are used.
What surface finishes work on 2.4889?
Not anodizable; normal finish is bright-annealed or pre-oxidized surface — pre-oxidation at 950–1100 °C in air gives the protective, electrically insulating chromia layer for tubular heaters.
2.4889 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 |
|---|---|---|
| Cr | 28 – 31 | 29.5 |
| Feresidual/controlled | 0 – 1.5 | 0.7 |
| Siimproves oxide adherence and resistivity | 0.8 – 2 | 1.5 |
| Mn | 0 – 1 | 0.3 |
| C | 0 – 0.08 | 0.04 |
| Cerare-earth addition (Ce/mischmetal) for scale adherence | 0.02 – 0.15 | 0.05 |
| Al | 0 – 0.5 | 0.2 |
| S | 0 – 0.02 | — |
| Nibalance, approx. 67–70 % | balance | — |
2.4889 Annealed — frequently asked
What is 2.4889 Annealed used for?
2.4889 Annealed is typically used for electric furnace heating elements, resistance wire and strip and high-temperature radiant heaters. In short: 1250 °C element alloy; ce-stabilised adherent scale; excellent wire drawability.
What is the yield strength of 2.4889 Annealed?
2.4889 Annealed has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 760 MPa (110 ksi) — stronger than 56% of nickel alloy grades. Strength varies by condition: see the 4 listed tempers.
Is 2.4889 Annealed easy to machine?
Not especially — machinability is rated poor (22/100, better than 64% of nickel alloy grades). Gummy and strongly work-hardening — use rigid setups, sharp positive-rake carbide, low speed (15–25 m/min), heavy positive feed and flood coolant; avoid dwelling.
Can 2.4889 Annealed be welded?
Yes — weldability is rated good (65/100). Joined mainly by resistance/spot, TIG or plasma with matching Ni-Cr filler; keep heat input low, clean off oxide first, and avoid sulphur-bearing marking pens or lubricants.
What surface finishes work on 2.4889 Annealed?
Not anodizable; normal finish is bright-annealed or pre-oxidized surface — pre-oxidation at 950–1100 °C in air gives the protective, electrically insulating chromia layer for tubular heaters.
Can 2.4889 Annealed be formed, bent or molded?
Excellent cold drawability and coilability in the annealed state; heavy cold work raises strength fast, so interstage anneals at 950–1050 °C with rapid cooling are used.
What is the maximum service temperature of 2.4889 Annealed?
2.4889 Annealed is rated for continuous use to about 1,250°C (2,282 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 2.4889 Annealed and 2.4889-H?
Annealed is the default condition — standard stocked condition for winding heating coils and forming elements — maximum ductility, stable resistance. H: cold-drawn wire for stiff straight elements, resistor windings and cut-to-length parts; anneals out at first heat-up. Yield strength is 400 MPa in Annealed versus 950 MPa in H.
Sources
- DIN 17470 — Heizleiterlegierungen (heating conductor alloys) — DIN (1984)
- EN 60584 / IEC 60584 related resistance-alloy material numbers (Werkstoff-Nr. 2.4889) — CEN/IEC (2013)
- Nikrothal 70 (Ni-Cr 70/30) resistance heating alloy datasheet — Kanthal / Sandvik (2021)
- Resistohm 70 / NiCr 70-30 datasheet — Aperam Alloys Imphy (2020)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (electrical resistance alloys) — ASM International (1990)
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.