Stainless Steel S32808-HFA
Heat-treated state
UNS S32808
HFA = hot finished / hot worked, then solution annealed and quenched
Heavy-wall seamless pipe and forged blanks: hot pierced/extruded then re-annealed to restore phase balance.
Values for the HFA condition
Other S32808 tempers and conditions
S32808 is listed in 4 conditions; see the grade overview at S32808.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HFAThis page Hot finished / hot worked, then solution annealed and quenched | Heavy-wall seamless pipe and forged blanks: hot pierced/extruded then re-annealed to restore phase balance. | 600 | 810 | 29 | 26 HRC | 2 % IACS |
As-welded deposit | Condition of welded pipe/fabrication joints; expect lower toughness and slightly reduced pitting resistance in the HAZ unless re-annealed. | 600 | 800 | 22 | 28 HRC | 2 % IACS |
SADefault Solution annealed and water quenched | Standard supply condition for pipe, tube, plate and fittings; best phase balance and corrosion resistance. | 620 | 830 | 30 | 27 HRC | — |
Cold drawn | Choose for tight-tolerance small-diameter tube or bar where extra strength is wanted; ductility and hardness limits per ASTM A789 must still be met. | 720 | 900 | 22 | 31 HRC | 2 % IACS |
What is S32808-HFA?
S32808-HFA is S32808 heat treated to HFA — heavy-wall seamless pipe and forged blanks: hot pierced/extruded then re-annealed to restore phase balance. S32808-HFA has a yield strength of 600 MPa (87 ksi) and a tensile strength of 810 MPa (117 ksi) — stronger than 86% of stainless steel grades. Elongation at break is 29% and the elastic modulus is 200 GPa (29 Msi). S32808-HFA has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,350°C (2,462 °F). SA is the default condition FabDigit quotes; HFA is available on request or by drawing note.
Advantages
- Good corrosion resistance — 88/100, better than 97% of stainless steel grades
- High strength — 600 MPa (87 ksi), better than 86% of stainless steel grades
Limitations
- Difficult to machine — 23/100, worse than 93% of stainless steel grades
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
S32808-HFA properties
Typical room-temperature values for S32808-HFA; 22 are specific to this condition. Other listed values are S32808 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S32808-HFA has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,350°C (2,462 °F).
Mechanical16
S32808-HFA has a yield strength of 600 MPa (87 ksi) and a tensile strength of 810 MPa (117 ksi) — stronger than 86% of stainless steel grades. Elongation at break is 29% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S32808-HFA is rated for continuous service to 300°C (572 °F). It conducts heat at 13.5 W/m·K (7.8 BTU/hr·ft·°F), worse than 83% of stainless steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
S32808-HFA conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), better than 97% of stainless steel grades.
Sustainability4
Producing a kilogram of S32808-HFA takes about 58 MJ of energy and emits 4.2 kg of CO₂ — more than 66% of stainless steel grades. Typical recycled content is 50%.
Manufacturability7
S32808-HFA's machinability is poor (23/100, worse than 93% of stainless steel grades); weldability good (55/100); formability fair (36/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S32808-HFA
Is S32808 easy to machine?
Rigid setups, positive-rake carbide, heavy constant feed and flood coolant; cutting speeds roughly 40–60 % of 316L because of high N strength and rapid work hardening.
Can S32808 be welded?
GTAW/GMAW/SMAW with 25Cr-super-duplex or overalloyed filler, Ar+2%N2 shielding, interpass ≤150 °C and heat input ~0.5–1.5 kJ/mm to keep ferrite 40–60 % and avoid σ/nitride precipitation; no preheat, no PWHT unless full re-solution anneal.
Can S32808 be formed, bent or molded?
Hot work 1000–1200 °C followed by mandatory solution anneal at 1050–1120 °C and rapid water quench; cold forming needs ~2× the load and generous springback allowance of austenitic grades.
What surface finishes work on S32808?
Pickle in HNO3-HF and passivate after any hot work or welding to remove heat tint; electropolishing or fine mechanical polishing for seawater and hygienic service; do not anodize.
S32808 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 |
|---|---|---|
| C | ≤ 0.03 | 0.02 |
| Si | ≤ 0.5 | 0.3 |
| Mn | ≤ 1 | 0.5 |
| P | ≤ 0.03 | — |
| S | ≤ 0.02 | — |
| Cr | 27 – 27.9 | 27.5 |
| Ni | 7 – 8.2 | 7.6 |
| Mo | 0.8 – 1.2 | 1 |
| Wtungsten replaces part of Mo | 2.1 – 2.5 | 2.3 |
| N | 0.3 – 0.4 | 0.35 |
| Febalance ≈ 60 % | balance | — |
S32808-HFA — frequently asked
What is S32808-HFA used for?
S32808-HFA is typically used for deep sour gas piping, chemical processing and heat exchangers. In short: hyper duplex, PREN 42–45; super-austenitic corrosion, duplex strength; hard to machine and form.
What is the yield strength of S32808-HFA?
S32808-HFA has a typical yield strength of 600 MPa (87 ksi) and a tensile strength of 810 MPa (117 ksi) — stronger than 86% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is S32808-HFA easy to machine?
Not especially — machinability is rated poor (23/100, worse than 93% of stainless steel grades). Rigid setups, positive-rake carbide, heavy constant feed and flood coolant; cutting speeds roughly 40–60 % of 316L because of high N strength and rapid work hardening.
Can S32808-HFA be welded?
Yes — weldability is rated good (55/100). GTAW/GMAW/SMAW with 25Cr-super-duplex or overalloyed filler, Ar+2%N2 shielding, interpass ≤150 °C and heat input ~0.5–1.5 kJ/mm to keep ferrite 40–60 % and avoid σ/nitride precipitation; no preheat, no PWHT unless full re-solution anneal.
What surface finishes work on S32808-HFA?
Pickle in HNO3-HF and passivate after any hot work or welding to remove heat tint; electropolishing or fine mechanical polishing for seawater and hygienic service; do not anodize.
Can S32808-HFA be formed, bent or molded?
Hot work 1000–1200 °C followed by mandatory solution anneal at 1050–1120 °C and rapid water quench; cold forming needs ~2× the load and generous springback allowance of austenitic grades.
What is the maximum service temperature of S32808-HFA?
S32808-HFA is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S32808-SA and S32808-CD?
SA is the default condition — standard supply condition for pipe, tube, plate and fittings; best phase balance and corrosion resistance. CD: choose for tight-tolerance small-diameter tube or bar where extra strength is wanted; ductility and hardness limits per ASTM A789 must still be met. Yield strength is 620 MPa in SA versus 720 MPa in CD.
Sources
- ASTM A790/A790M — Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe — ASTM International (2023)
- ASTM A789/A789M — Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service — ASTM International (2023)
- ASTM A815/A815M — Wrought Ferritic/Austenitic Stainless Steel Piping Fittings — ASTM International (2022)
- DP-28W (UNS S32808) high-alloy duplex stainless tubular product data — Nippon Steel / Sumitomo Metals (2019)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (duplex stainless section) — ASM International (1990)
- Practical Guidelines for the Fabrication of Duplex Stainless Steels — IMOA (2014)
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.