Stainless Steel N08535 HF-ANN
Finish state
UNS N08535 · ASTM B366/B688
HF-ANN = hot Finished + Annealed
Choose for forged valve bodies, flanges and heavy bar where section size prevents cold work.
Values for the HF-ANN condition
Other N08535 tempers and conditions
N08535 is listed in 5 conditions; see the grade overview at N08535.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HF-ANNThis page Hot Finished + Annealed | Choose for forged valve bodies, flanges and heavy bar where section size prevents cold work. | 255 | 575 | 42 | 155 HB | 1.7 % IACS |
ANNDefault Annealed | Standard supply condition for plate, sheet, pipe and fittings; maximum corrosion resistance and ductility. | 265 | 590 | 45 | 160 HB | 1.7 % IACS |
As-welded deposit | Property set for weld joints made without post-weld solution anneal; expect reduced pitting resistance in autogenous welds. | 300 | 590 | 32 | 180 HB | 1.7 % IACS |
Cold drawn | Pick for close-tolerance shafting, fasteners and instrument tubing needing higher yield strength. | 520 | 720 | 25 | 20 HRC | 1.7 % IACS |
1/4 Hard | Use where springback-tolerant sheet with elevated yield strength is needed, e.g. clamps and gaskets. | 580 | 790 | 18 | 22 HRC | 1.7 % IACS |
What is N08535 HF-ANN?
N08535 HF-ANN is N08535 supplied in the HF-ANN condition — choose for forged valve bodies, flanges and heavy bar where section size prevents cold work. N08535 HF-ANN has a yield strength of 255 MPa (37 ksi) and a tensile strength of 575 MPa (83.4 ksi) — weaker than 87% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 195 GPa (28.3 Msi). N08535 HF-ANN has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,350°C (2,462 °F). ANN is the default condition FabDigit quotes; HF-ANN is available on request or by drawing note.
Advantages
- 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
Limitations
- Poor heat conductor — 11.5 W/m·K (6.64 BTU/hr·ft·°F), worse than 97% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- High embodied carbon — 6 kg CO₂/kg, worse than 88% of stainless steel grades
- Low strength — 255 MPa (37 ksi), worse than 87% of stainless steel grades
N08535 HF-ANN properties
Typical room-temperature values for N08535 HF-ANN; 22 are specific to this condition. Other listed values are N08535 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
N08535 HF-ANN has a density of 8 g/cm³ (0.289 lb/in³), heavier than 92% of stainless steel grades. It melts at 1,350°C (2,462 °F).
Mechanical15
N08535 HF-ANN has a yield strength of 255 MPa (37 ksi) and a tensile strength of 575 MPa (83.4 ksi) — weaker than 87% of stainless steel grades. Elongation at break is 42% and the elastic modulus is 195 GPa (28.3 Msi).
Thermal6
N08535 HF-ANN is rated for continuous service to 550°C (1,022 °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 15 µm/m·K (8.33 µin/in·°F).
Electrical3
N08535 HF-ANN conducts electricity at 1.7 % IACS, worse than 93% 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 N08535 HF-ANN takes about 78 MJ of energy and emits 6 kg of CO₂ — more than 87% of stainless steel grades. Typical recycled content is 45%.
Manufacturability8
N08535 HF-ANN's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability very good (72/100); formability good (66/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with N08535 HF-ANN
Is N08535 easy to machine?
Machine like Alloy 28/904L: rigid setups, positive-rake carbide, 15–25 m/min turning speeds, heavy constant feed and flood coolant to beat rapid work hardening.
Can N08535 be welded?
GTAW/GMAW with over-alloyed Ni-base filler (ERNiCrMo-3/-4) to avoid Mo segregation in the weld; low heat input, interpass < 100 °C, no preheat or PWHT, back-purge with argon.
Can N08535 be formed, bent or molded?
Cold forms well but needs roughly 50 % more force than 304 and generous bend radii; hot work 1100–1180 °C followed by solution anneal ~1120–1180 °C and rapid water quench.
What surface finishes work on N08535?
Pickle and passivate (HNO₃-HF) or electropolish after welding to restore the Cr-Mo passive film; heat tint must be fully removed for acid service.
N08535 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 superaustenitic; verify limit against the governing product spec | ≤ 0.03 | 0.02 |
| Si | ≤ 1 | 0.4 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.03 | 0 |
| Crrange per UNS listing for this Fe-Ni-Cr-Mo grade | 24 – 27 | 25.5 |
| Nihigh Ni gives chloride SCC immunity | 29 – 36.5 | 32 |
| Mo | 2.5 – 4 | 3.2 |
| Cuimproves sulfuric/phosphoric acid resistance | 0.6 – 1.6 | 1 |
| Fe | balance | — |
N08535 HF-ANN — frequently asked
What is N08535 HF-ANN used for?
N08535 HF-ANN is typically used for sulfuric acid process equipment, phosphoric acid production, pollution control scrubbers and chemical process vessels. In short: hot sulfuric acid resistance; 904L-class superaustenitic; low machinability, good formability.
What is the yield strength of N08535 HF-ANN?
N08535 HF-ANN has a typical yield strength of 255 MPa (37 ksi) and a tensile strength of 575 MPa (83.4 ksi) — weaker than 87% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is N08535 HF-ANN easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Machine like Alloy 28/904L: rigid setups, positive-rake carbide, 15–25 m/min turning speeds, heavy constant feed and flood coolant to beat rapid work hardening.
Can N08535 HF-ANN be welded?
Yes — weldability is rated very good (72/100). GTAW/GMAW with over-alloyed Ni-base filler (ERNiCrMo-3/-4) to avoid Mo segregation in the weld; low heat input, interpass < 100 °C, no preheat or PWHT, back-purge with argon.
What surface finishes work on N08535 HF-ANN?
Pickle and passivate (HNO₃-HF) or electropolish after welding to restore the Cr-Mo passive film; heat tint must be fully removed for acid service.
Can N08535 HF-ANN be formed, bent or molded?
Cold forms well but needs roughly 50 % more force than 304 and generous bend radii; hot work 1100–1180 °C followed by solution anneal ~1120–1180 °C and rapid water quench.
What is the maximum service temperature of N08535 HF-ANN?
N08535 HF-ANN is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between N08535-ANN and N08535-CD?
ANN is the default condition — standard supply condition for plate, sheet, pipe and fittings; maximum corrosion resistance and ductility. CD: pick for close-tolerance shafting, fasteners and instrument tubing needing higher yield strength. Yield strength is 265 MPa in ANN versus 520 MPa in CD.
Sources
- ASTM B366 — Factory-Made Wrought Nickel and Nickel Alloy Fittings — ASTM International (2023)
- ASTM B688 — Cr-Ni-Mo-Fe Plate, Sheet and Strip — ASTM International (2019)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- ASM Specialty Handbook: Stainless Steels (superaustenitic section) — ASM International (1994)
- Superaustenitic Fe-Ni-Cr-Mo acid-service alloy datasheets (904L / Alloy 28 / Alloy 926 class) — Various mills (2023)
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.