Nickel Alloy N06255
UNS N06255
N06255 is a nickel-chromium-molybdenum corrosion alloy developed for chemical-process environments that alternate between oxidizing and reducing media.
Reference datasheet — N06255 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.
Values for the SA condition
N06255 tempers and conditions
N06255 is supplied in 5 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot finished and solution annealed | Choose for heavy sections, forged valve bodies and flanges where hot working precedes the final solution anneal. | 340 | 730 | 50 | 185 HB | 1.4 % IACS |
SADefault Solution annealed | Standard stocked condition for plate, sheet, tube and bar in corrosion service — maximum corrosion resistance and ductility. | 355 | 760 | 55 | 195 HB | — |
As-welded deposit | Property set for undiluted weld metal / weld overlay used without post-weld solution anneal in chemical-process fabrication. | 450 | 740 | 38 | 210 HB | 1.3 % IACS |
Cold worked and stress relieved | Cold-drawn bar/tube given a low-temperature stress relief to cut residual stress and SCC risk while keeping most of the cold-work strength. | 640 | 900 | 28 | 28 HRC | 1.4 % IACS |
Cold drawn | Use where higher strength, closer tolerance and better surface are needed and full annealed corrosion performance is not mandatory. | 700 | 950 | 25 | 30 HRC | 1.4 % IACS |
What is N06255?
N06255 is a nickel-chromium-molybdenum corrosion alloy developed for chemical-process environments that alternate between oxidizing and reducing media. It is chosen for combined acid and chloride resistance and is stocked as sheet, plate, bar and welded pipe in SA, HF-A, CD, CD+SR and AW conditions. Annealed values are 355 MPa yield, 760 MPa tensile, 55% elongation and 195 HB (89 HRB), with service to 650 °C and a corrosion-resistance score of 92. Machinability is poor (score 20) and cost is high; C-276 is the usual substitute where oxidizing service is less severe. N06255 has a density of 8.6 g/cm³ (0.311 lb/in³), heavier than 67% of nickel alloy grades. It melts at 1,330°C (2,426 °F). N06255 has a yield strength of 355 MPa (51.5 ksi) and a tensile strength of 760 MPa (110 ksi) — weaker than 59% of nickel alloy grades. Elongation at break is 55% and the elastic modulus is 205 GPa (29.7 Msi).
What is N06255 used for?
- chemical reactors
- sulfuric/phosphoric acid equipment
- flue gas systems
- marine and offshore components
Advantages
- Polishes to a fine finish — 80/100, better than 97% of nickel alloy grades
- Ductile — tolerates forming and impact — 55%, better than 93% of nickel alloy grades
- Good corrosion resistance — 92/100, better than 91% of nickel alloy grades
- Readily welded — 85/100, better than 83% of nickel alloy grades
- Forms and bends easily — 75/100, better than 82% of nickel alloy grades
N06255 properties
Typical room-temperature values for N06255-SA; bars are the position among nickel alloy grades.
Physical3
N06255 has a density of 8.6 g/cm³ (0.311 lb/in³), heavier than 67% of nickel alloy grades. It melts at 1,330°C (2,426 °F).
Mechanical14
N06255 has a yield strength of 355 MPa (51.5 ksi) and a tensile strength of 760 MPa (110 ksi) — weaker than 59% of nickel alloy grades. Elongation at break is 55% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
N06255 is rated for continuous service to 650°C (1,202 °F). It conducts heat at 10 W/m·K (5.78 BTU/hr·ft·°F), worse than 88% of nickel alloy grades. Thermal expansion is 12.4 µm/m·K (6.89 µin/in·°F).
Electrical3
N06255 conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 91% of nickel alloy grades.
Sustainability4
Producing a kilogram of N06255 takes about 140 MJ of energy and emits 13 kg of CO₂ — less than 81% of nickel alloy grades. Typical recycled content is 40%.
Manufacturability8
N06255's machinability is poor (20/100, better than 53% of nickel alloy grades); weldability excellent (85/100); formability very good (75/100).
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. N06255 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with N06255
Is N06255 easy to machine?
Treat like C-276/alloy 22: rigid setup, positive-rake sharp carbide or ceramic-free tooling, low speed / heavy positive feed to cut under the work-hardened skin, flood high-pressure coolant, never dwell.
Can N06255 be welded?
GTAW/GMAW with matching low-carbon Ni-Cr-Mo filler or autogenous on thin gauge; low heat input, interpass below ~120 °C, no preheat and normally no PWHT — full solution anneal only if maximum corrosion resistance is required.
Can N06255 be formed, bent or molded?
Very ductile but strongly work-hardening; allow larger bend radii and higher press tonnage than stainless, and interstage-anneal (solution anneal + quench) for deep draws or multi-stage forming.
N06255 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 |
|---|---|---|
| Crindicative | 22 – 26 | 24 |
| Moindicative | 6 – 9 | 7 |
| Feindicative residual/alloy iron | ≤ 5 | |
| Clow-carbon design to limit sensitization | ≤ 0.03 | |
| Siindicative | ≤ 0.08 | |
| Mnindicative | ≤ 1 | |
| Pindicative | ≤ 0.03 | |
| Sindicative | ≤ 0.02 | |
| Nibalance; indicative Ni-Cr-Mo corrosion-alloy analysis — confirm against the governing ASTM/ASME specification and mill certificate | balance |
What surface finishes work on N06255?
Pickle (HNO₃-HF) or grind off all weld/heat-tint oxides before service, then passivate; no anodizing — mechanical polish or electropolish for high-purity/CIP surfaces.
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
How much does N06255 cost?
N06255 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.
N06255 — frequently asked
What is N06255 used for?
N06255 is typically used for chemical reactors, sulfuric/phosphoric acid equipment, flue gas systems and marine and offshore components. In short: oxidizing and reducing service; C-276 class corrosion resistance; low machinability, high cost.
What is the yield strength of N06255?
N06255 has a typical yield strength of 355 MPa (51.5 ksi) and a tensile strength of 760 MPa (110 ksi) — weaker than 59% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is N06255 easy to machine?
Not especially — machinability is rated poor (20/100, better than 53% of nickel alloy grades). Treat like C-276/alloy 22: rigid setup, positive-rake sharp carbide or ceramic-free tooling, low speed / heavy positive feed to cut under the work-hardened skin, flood high-pressure coolant, never dwell.
Can N06255 be welded?
Yes — weldability is rated excellent (85/100). GTAW/GMAW with matching low-carbon Ni-Cr-Mo filler or autogenous on thin gauge; low heat input, interpass below ~120 °C, no preheat and normally no PWHT — full solution anneal only if maximum corrosion resistance is required.
What surface finishes work on N06255?
Pickle (HNO₃-HF) or grind off all weld/heat-tint oxides before service, then passivate; no anodizing — mechanical polish or electropolish for high-purity/CIP surfaces.
Can N06255 be formed, bent or molded?
Very ductile but strongly work-hardening; allow larger bend radii and higher press tonnage than stainless, and interstage-anneal (solution anneal + quench) for deep draws or multi-stage forming.
What is the maximum service temperature of N06255?
N06255 is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between N06255-SA and N06255-CD?
SA is the default condition — standard stocked condition for plate, sheet, tube and bar in corrosion service — maximum corrosion resistance and ductility. CD: use where higher strength, closer tolerance and better surface are needed and full annealed corrosion performance is not mandatory. Yield strength is 355 MPa in SA versus 700 MPa in CD.
How much does N06255 cost?
N06255 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
- ASTM B575 — Ni-Cr-Mo Alloy Plate, Sheet and Strip — ASTM International (2022)
- ASTM B574 / B622 / B626 — Ni-Cr-Mo Alloy Rod, Seamless Pipe & Tube, Welded Tube — ASTM International (2021)
- ASTM B564 — Nickel Alloy Forgings — ASTM International (2022)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys — ASM International (2000)
- UNS Metals & Alloys in the Unified Numbering System — SAE/ASTM (2017)
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.