Nickel 270 Stress Relieved
Heat-treated state
UNS N02270
Use when cold-worked strength must be kept but residual stress and spring-back/distortion during machining or brazing must be reduced.
Values for the Stress Relieved condition
Other Nickel 270 tempers and conditions
Nickel 270 is listed in 5 conditions; see the grade overview at Nickel 270.
- Annealed
- Hot Finished
- Stress Relieved
- Cold Drawn
- Full Hard
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault fully softened (bright/hydrogen annealed sheet, strip, rod) | Default stocked condition: maximum ductility and lowest hardness for deep drawing, spinning and electronic-component fabrication. | 105 | 345 | 50 | 45 HB | 23 % IACS |
hot rolled / hot worked, as-fabricated | Heavier bar and plate as hot worked; slightly higher strength than annealed, used where a subsequent anneal or machining follows. | 150 | 400 | 45 | 75 HB | 22 % IACS |
Stress RelievedThis page cold worked then low-temperature stress relief | Use when cold-worked strength must be kept but residual stress and spring-back/distortion during machining or brazing must be reduced. | 380 | 470 | 20 | 120 HB | 22 % IACS |
cold drawn rod/wire/tube, as-drawn | Choose for straight, close-tolerance rod, wire and tube where moderate strength and better chip control than annealed are needed. | 420 | 500 | 15 | 130 HB | 22 % IACS |
heavily cold rolled strip/foil | Cold-rolled strip and foil for springs, contacts and stamped electronic parts where stiffness and edge quality matter more than ductility. | 530 | 590 | 4 | 175 HB | 22 % IACS |
What is Nickel 270 Stress Relieved?
Nickel 270 Stress Relieved is Nickel 270 heat treated to Stress Relieved — use when cold-worked strength must be kept but residual stress and spring-back/distortion during machining or brazing must be reduced. Nickel 270 Stress Relieved has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 53% of nickel alloy grades. Elongation at break is 20% and the elastic modulus is 207 GPa (30 Msi). Nickel 270 Stress Relieved has a density of 8.89 g/cm³ (0.321 lb/in³), heavier than 88% of nickel alloy grades. It melts at 1,454°C (2,649 °F). Annealed is the default condition FabDigit quotes; Stress Relieved is available on request or by drawing note.
Advantages
- Conducts heat well — 82 W/m·K (47.4 BTU/hr·ft·°F), better than 99% of nickel alloy grades
- High electrical conductivity — 22 % IACS, better than 99% of nickel alloy grades
- Polishes to a fine finish — 82/100, better than 99% of nickel alloy grades
- Easy to machine — 30/100, better than 90% of nickel alloy grades
Limitations
- Limited service temperature — 315°C (599 °F), worse than 98% of nickel alloy grades
- Limited ductility — 20%, worse than 76% of nickel alloy grades
Nickel 270 Stress Relieved properties
Typical room-temperature values for Nickel 270 Stress Relieved; 21 are specific to this condition. Other listed values are Nickel 270 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Nickel 270 Stress Relieved has a density of 8.89 g/cm³ (0.321 lb/in³), heavier than 88% of nickel alloy grades. It melts at 1,454°C (2,649 °F).
Mechanical13
Nickel 270 Stress Relieved has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 53% of nickel alloy grades. Elongation at break is 20% and the elastic modulus is 207 GPa (30 Msi).
Thermal6
Nickel 270 Stress Relieved is rated for continuous service to 315°C (599 °F). It conducts heat at 82 W/m·K (47.4 BTU/hr·ft·°F), better than 99% of nickel alloy grades. Thermal expansion is 13.3 µm/m·K (7.39 µin/in·°F).
Electrical3
Nickel 270 Stress Relieved conducts electricity at 22 % IACS, better than 99% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), worse than 77% of nickel alloy grades.
Sustainability4
Producing a kilogram of Nickel 270 Stress Relieved takes about 220 MJ of energy and emits 14 kg of CO₂ — more than 86% of nickel alloy grades. Typical recycled content is 2%.
Manufacturability7
Nickel 270 Stress Relieved's machinability is poor (30/100, better than 90% of nickel alloy grades); weldability very good (80/100); formability good (55/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Nickel 270 Stress Relieved
Is Nickel 270 easy to machine?
Very gummy and work-hardening — use sharp positive-rake carbide, heavy positive feed, low-to-moderate speed and copious sulphur-free (chlorinated or synthetic) coolant to avoid built-up edge and smearing.
Can Nickel 270 be welded?
Readily GTAW/EBW/laser welded, usually autogenously or with Ni-filler ERNi-1; keep joints free of sulphur, lead and grease to avoid hot cracking, and avoid heavy oxide pickup that would compromise purity.
Can Nickel 270 be formed, bent or molded?
Excellent cold formability in the annealed condition — deep drawing, spinning, stamping and fine-blanking; interstage anneal at 700–870 °C in dry hydrogen or vacuum after ~60% reduction.
What surface finishes work on Nickel 270?
Electropolishing or bright hydrogen annealing gives the clean, low-outgassing surface required for vacuum/electronic use; nickel is not anodized and generally needs no coating, but sulphur-bearing pickling and marking inks must be avoided.
Nickel 270 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 |
|---|---|---|
| C | ≤ 0.02 | 0.01 |
| Fe | ≤ 0.01 | 0 |
| Mn | ≤ 0 | 5×10⁻⁴ |
| S | ≤ 0 | 5×10⁻⁴ |
| Si | ≤ 0 | 5×10⁻⁴ |
| Cu | ≤ 0 | 5×10⁻⁴ |
| Ti | ≤ 0 | 5×10⁻⁴ |
| Mg | ≤ 0 | 5×10⁻⁴ |
| Co | ≤ 0 | 5×10⁻⁴ |
| Cr | ≤ 0 | 5×10⁻⁴ |
| Niincluding incidental cobalt | ≥ 99.97 (balance) | — |
Nickel 270 Stress Relieved — frequently asked
What is Nickel 270 Stress Relieved used for?
Nickel 270 Stress Relieved is typically used for battery electrode plates, electroforming, specialty chemical process equipment and PM feedstock. In short: highest-purity wrought nickel; best formability in family; low-outgassing vacuum surfaces.
What is the yield strength of Nickel 270 Stress Relieved?
Nickel 270 Stress Relieved has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 470 MPa (68.2 ksi) — weaker than 53% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Nickel 270 Stress Relieved easy to machine?
Not especially — machinability is rated poor (30/100, better than 90% of nickel alloy grades). Very gummy and work-hardening — use sharp positive-rake carbide, heavy positive feed, low-to-moderate speed and copious sulphur-free (chlorinated or synthetic) coolant to avoid built-up edge and smearing.
Can Nickel 270 Stress Relieved be welded?
Yes — weldability is rated very good (80/100). Readily GTAW/EBW/laser welded, usually autogenously or with Ni-filler ERNi-1; keep joints free of sulphur, lead and grease to avoid hot cracking, and avoid heavy oxide pickup that would compromise purity.
What surface finishes work on Nickel 270 Stress Relieved?
Electropolishing or bright hydrogen annealing gives the clean, low-outgassing surface required for vacuum/electronic use; nickel is not anodized and generally needs no coating, but sulphur-bearing pickling and marking inks must be avoided.
Can Nickel 270 Stress Relieved be formed, bent or molded?
Excellent cold formability in the annealed condition — deep drawing, spinning, stamping and fine-blanking; interstage anneal at 700–870 °C in dry hydrogen or vacuum after ~60% reduction.
What is the maximum service temperature of Nickel 270 Stress Relieved?
Nickel 270 Stress Relieved is rated for continuous use to about 315°C (599 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- Nickel 270 alloy datasheet — Special Metals Corporation (2020)
- ASTM B160 / B161 / B162 — Nickel rod, bar, pipe, tube, plate, sheet and strip (UNS N02270) — ASTM International (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- UNS N02270 alloy record — SAE/ASTM Unified Numbering System (2019)
- Nickel Institute corrosion and LCA reference data — Nickel Institute (2020)
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.