Stainless Steel N08026 Annealed
Temper · default condition
UNS N08026 · ASTM B366/B462/B463
Standard supply condition for plate, sheet, pipe, fittings and forgings — maximum corrosion resistance and ductility.
Values for the Annealed condition
Other N08026 tempers and conditions
N08026 is listed in 4 conditions; see the grade overview at N08026.
- FORGED-ANN
- Annealed
- AW
- CD
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 |
AnnealedDefaultThis page 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 | — |
What is N08026 Annealed?
N08026 Annealed is N08026 in the Annealed temper — standard supply condition for plate, sheet, pipe, fittings and forgings — maximum corrosion resistance and ductility. N08026 Annealed 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). N08026 Annealed 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).
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 Annealed properties
Typical room-temperature values for N08026 Annealed; 13 are specific to this condition. Other listed values are N08026 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
N08026 Annealed 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 Annealed 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 Annealed 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 Annealed 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 Annealed 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 Annealed'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. Confirm any required mill or lot documentation when quoting.
Working with N08026 Annealed
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.
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.
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 | — |
N08026 Annealed — frequently asked
What is N08026 Annealed used for?
N08026 Annealed 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 Annealed?
N08026 Annealed 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 Annealed 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 Annealed 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 Annealed?
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 Annealed 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 Annealed?
N08026 Annealed 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.