Stainless Steel N08026
UNS N08026 · ASTM B366/B462/B463
N08026 is a higher-molybdenum development of the Alloy 20 superaustenitic family, ordered to ASTM B366/B462/B463 as annealed plate, hot-finished and cold-drawn bar, cold-worked tube, annealed forgings and as-welded product.
Reference datasheet — N08026 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 Annealed condition
N08026 tempers and conditions
N08026 is supplied in 4 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
flanges, valve bodies and fittings per ASTM B462/B366 | Specify for pressure-boundary forgings and pipe fittings that must meet ASME B16.5/B16.9 with full corrosion resistance restored after hot work. | 305 | 610 | 42 | 170 HB | 1.6 % IACS |
AnnealedDefault solution annealed (~1120–1180 °C, rapid quench) | Standard supply condition for plate, sheet, pipe, fittings and forgings — maximum corrosion resistance and ductility. | 310 | 620 | 45 | 170 HB | — |
As-welded deposit | Reference condition for fabricated piping and vessels; use an overalloyed Ni-base filler (e.g. ERNiCrMo-3) to keep weld-metal PREN above the base metal. | 330 | 600 | 35 | 185 HB | 1.6 % IACS |
Cold drawn | Pick for close-tolerance bar, fastener stock and shafts needing higher yield strength and better chip control. | 550 | 760 | 25 | 22 HRC | — |
Supply forms, finishes and certifications
Ways N08026 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CW-Tube | Cold Worked Tube | Supply form |
HFA | Hot Finished + Annealed | Surface finish |
What is N08026?
N08026 is a higher-molybdenum development of the Alloy 20 superaustenitic family, ordered to ASTM B366/B462/B463 as annealed plate, hot-finished and cold-drawn bar, cold-worked tube, annealed forgings and as-welded product. The extra molybdenum improves resistance to hot sulfuric acid and to pitting and crevice attack (corrosion rating 80), so it is specified for chemical process piping, pumps and flue-gas desulfurization hardware. Default properties are 310 MPa yield, 620 MPa tensile, 45 % elongation and 170 HB (88 HRB), with service to 500 °C. It work-hardens like a nickel alloy, needs overalloyed Ni-Cr-Mo filler, and costs well above 316L; use N08020 or N08024 where the acid duty is milder. N08026 has a density of 8.02 g/cm³ (0.29 lb/in³), heavier than 97% of stainless steel grades. It melts at 1,345°C (2,453 °F). N08026 has a yield strength of 310 MPa (45 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 63% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 193 GPa (28 Msi).
What is N08026 used for?
- hot sulfuric acid service
- chemical process piping and pumps
- flue gas desulfurization components
- phosphoric acid production equipment
Advantages
- Polishes to a fine finish — 80/100, better than 89% of stainless steel grades
- Good corrosion resistance — 80/100, better than 88% of stainless steel grades
- Tough — resists crack growth — 200 MPa·√m (182 ksi·√in), better than 86% of stainless steel grades
- Forms and bends easily — 70/100, better than 79% of stainless steel grades
- Ductile — tolerates forming and impact — 45%, better than 76% of stainless steel grades
Limitations
- Low electrical conductivity — 1.6 % IACS, worse than 99% of stainless steel grades
- Poor heat conductor — 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades
- High embodied carbon — 7 kg CO₂/kg, worse than 96% of stainless steel grades
N08026 properties
Typical room-temperature values for N08026-Annealed; bars are the position among stainless steel grades.
Physical3
N08026 has a density of 8.02 g/cm³ (0.29 lb/in³), heavier than 97% of stainless steel grades. It melts at 1,345°C (2,453 °F).
Mechanical16
N08026 has a yield strength of 310 MPa (45 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 63% of stainless steel grades. Elongation at break is 45% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
N08026 is rated for continuous service to 500°C (932 °F). It conducts heat at 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades. Thermal expansion is 14.4 µm/m·K (8 µin/in·°F).
Electrical3
N08026 conducts electricity at 1.6 % IACS, worse than 99% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 88% of stainless steel grades.
Sustainability4
Producing a kilogram of N08026 takes about 95 MJ of energy and emits 7 kg of CO₂ — more than 96% of stainless steel grades. Typical recycled content is 45%.
Manufacturability8
N08026's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability very good (78/100); formability very good (70/100).
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 stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. N08026 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with N08026
Is N08026 easy to machine?
Treat as a nickel alloy: rigid setups, positive-rake sharp carbide, 20–35 m/min surface speed, heavy constant feed and flood coolant to avoid work-hardened glazing.
Can N08026 be welded?
Weld with GTAW/GMAW/SMAW using overalloyed Ni-Cr-Mo filler (ERNiCrMo-3/-4); keep interpass below ~150 °C and heat input low, no preheat, no PWHT required.
Can N08026 be formed, bent or molded?
Cold forms well but work-hardens rapidly — allow 40–60% more press force than 304 and interstage anneal at 1120–1180 °C with rapid quench; hot work 1100–1200 °C then solution anneal.
N08026 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 |
|---|---|---|
| Clow carbon to avoid sensitization | ≤ 0.03 | 0.02 |
| Mn | ≤ 1 | 0.6 |
| Si | ≤ 0.5 | 0.3 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0 |
| Nichloride SCC immunity | 33 – 37.2 | 35 |
| Cr | 22 – 26 | 24 |
| Mopitting/crevice resistance | 5 – 6.7 | 5.8 |
| Cusulfuric acid resistance | 2 – 4 | 3 |
| N | 0.1 – 0.16 | 0.13 |
| Fe | balance |
What surface finishes work on N08026?
Pickle in HNO3-HF and passivate (ASTM A967) after hot work or welding; electropolishing gives best pitting performance in process service — do not anodize.
Surface treatments FabDigit runs on stainless steel 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).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel N08026 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B366/B462/B463
- Other
- Incoloy 20Mo-6
How much does N08026 cost?
N08026 is a high-cost stainless steel ($$$$), 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.
N08026 — frequently asked
What is N08026 used for?
N08026 is typically used for hot sulfuric acid service, chemical process piping and pumps, flue gas desulfurization components and phosphoric acid production equipment. In short: highest-Mo Alloy 20 type; hot sulfuric acid grade; work-hardens like nickel alloy.
What is the yield strength of N08026?
N08026 has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 63% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is N08026 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% of stainless steel grades). Treat as a nickel alloy: rigid setups, positive-rake sharp carbide, 20–35 m/min surface speed, heavy constant feed and flood coolant to avoid work-hardened glazing.
Can N08026 be welded?
Yes — weldability is rated very good (78/100). Weld with GTAW/GMAW/SMAW using overalloyed Ni-Cr-Mo filler (ERNiCrMo-3/-4); keep interpass below ~150 °C and heat input low, no preheat, no PWHT required.
What surface finishes work on N08026?
Pickle in HNO3-HF and passivate (ASTM A967) after hot work or welding; electropolishing gives best pitting performance in process service — do not anodize.
Can N08026 be formed, bent or molded?
Cold forms well but work-hardens rapidly — allow 40–60% more press force than 304 and interstage anneal at 1120–1180 °C with rapid quench; hot work 1100–1200 °C then solution anneal.
What is the maximum service temperature of N08026?
N08026 is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between N08026 Annealed and N08026-CD?
Annealed is the default condition — standard supply condition for plate, sheet, pipe, fittings and forgings — maximum corrosion resistance and ductility. CD: pick for close-tolerance bar, fastener stock and shafts needing higher yield strength and better chip control. Yield strength is 310 MPa in Annealed versus 550 MPa in CD.
How much does N08026 cost?
N08026 is a high-cost stainless steel ($$$$), 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 B463 — Ni-Fe-Cr-Mo-Cu Alloy Plate, Sheet and Strip — ASTM International (2021)
- ASTM B462 — Forged or Rolled UNS N08020, N08026 ... Pipe Flanges and Fittings — ASTM International (2022)
- ASTM B366 — Factory-Made Wrought Nickel and Nickel Alloy Fittings — ASTM International (2023)
- ASTM B473 — UNS N08020, N08026, N08024 Bar and Wire — ASTM International (2021)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Alloy 20 / 20Mo-6 corrosion-resistant alloy data — Specialty alloy producers (Carpenter/Sandvik-class datasheets) (2020)
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.