Stainless Steel N08026 FORGED-ANN
Finish state
UNS N08026 · ASTM B366/B462/B463
Specify for pressure-boundary forgings and pipe fittings that must meet ASME B16.5/B16.9 with full corrosion resistance restored after hot work.
Values for the FORGED-ANN condition
Other N08026 tempers and conditions
N08026 is listed in 4 conditions; see the grade overview at N08026.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
FORGED-ANNThis page 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 | — |
What is N08026 FORGED-ANN?
N08026 FORGED-ANN is N08026 supplied in the FORGED-ANN condition — specify for pressure-boundary forgings and pipe fittings that must meet ASME B16.5/B16.9 with full corrosion resistance restored after hot work. N08026 FORGED-ANN has a yield strength of 305 MPa (44.2 ksi) and a tensile strength of 610 MPa (88.5 ksi) — weaker than 66% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 193 GPa (28 Msi). N08026 FORGED-ANN 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). Annealed is the default condition FabDigit quotes; FORGED-ANN is available on request or by drawing note.
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 — 195 MPa·√m (177.5 ksi·√in), better than 77% 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 FORGED-ANN properties
Typical room-temperature values for N08026 FORGED-ANN; 22 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 FORGED-ANN 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 FORGED-ANN has a yield strength of 305 MPa (44.2 ksi) and a tensile strength of 610 MPa (88.5 ksi) — weaker than 66% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 193 GPa (28 Msi).
Thermal6
N08026 FORGED-ANN 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 FORGED-ANN 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 FORGED-ANN 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 FORGED-ANN's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability very good (78/100); formability good (65/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with N08026 FORGED-ANN
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 FORGED-ANN — frequently asked
What is N08026 FORGED-ANN used for?
N08026 FORGED-ANN 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 FORGED-ANN?
N08026 FORGED-ANN has a typical yield strength of 305 MPa (44.2 ksi) and a tensile strength of 610 MPa (88.5 ksi) — weaker than 66% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is N08026 FORGED-ANN 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 FORGED-ANN 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 FORGED-ANN?
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 FORGED-ANN 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 FORGED-ANN?
N08026 FORGED-ANN 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.