Stainless Steel S32808
UNS S32808
S32808 (2807) is a hyper duplex stainless steel with a PREN of about 42–45, using high chromium, molybdenum and nitrogen to reach corrosion resistance approaching super-austenitic grades while keeping duplex strength.
Reference datasheet — S32808 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 SA condition
S32808 tempers and conditions
S32808 is supplied in 4 conditions, soft to hard. SA 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 |
|---|---|---|---|---|---|---|
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?
S32808 (2807) is a hyper duplex stainless steel with a PREN of about 42–45, using high chromium, molybdenum and nitrogen to reach corrosion resistance approaching super-austenitic grades while keeping duplex strength. Solution-annealed, hot-finished, cold-drawn and as-welded forms provide 620 MPa yield, 830 MPa tensile, 30% elongation and 265 HB (27 HRC). Machinability rates 22 and formability 35, so cycle times, tooling wear and press loads are all high, and service is limited to about 300 °C by sigma and 475 °C embrittlement. S32750 is cheaper and more widely stocked where PREN above 40 is not required. S32808 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). S32808 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
What is S32808 used for?
- deep sour gas piping
- chemical processing
- heat exchangers
Advantages
- Good corrosion resistance — 88/100, better than 97% of stainless steel grades
- High strength — 620 MPa (89.9 ksi), better than 88% of stainless steel grades
Limitations
- Difficult to machine — 22/100, worse than 95% 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 properties
Typical room-temperature values for S32808-SA; bars are the position among stainless steel grades.
Physical3
S32808 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 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S32808 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 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 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's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability good (55/100); formability fair (35/100).
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. S32808 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S32808
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.
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 |
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.
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 S32808 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Trade names
- 2807
How much does S32808 cost?
S32808 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.
S32808 — frequently asked
What is S32808 used for?
S32808 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?
S32808 has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 830 MPa (120 ksi) — stronger than 88% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is S32808 easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% 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 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?
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 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?
S32808 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.
How much does S32808 cost?
S32808 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 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; 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.