Stainless Steel S32906
UNS S32906 · EN 1.4477
S32906 (1.4477, SAF 2906) is a high-strength super duplex stainless steel formulated with lower nickel than 2507 to reduce sensitivity to nickel price swings while retaining similar corrosion performance.
Reference datasheet — S32906 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
S32906 tempers and conditions
S32906 is supplied in 7 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As-welded deposit | Typical fabricated joint condition; weld metal strength matches base metal but toughness and pitting resistance depend on achieving 30–60 % ferrite. | 650 | 850 | 22 | 27 HRC | 2 % IACS |
Hot Rolled / Hot Finished + Solution Annealed and Pickled | Heavy plate and hot-finished seamless tube; same heat treatment as SA but coarser surface and slightly lower typical strength in thick sections. | 680 | 880 | 30 | 28 HRC | 2 % IACS |
Forged + Solution Annealed (ASTM A182 F-grade forgings) | Flanges, valve bodies and heavy fittings; requires careful forging finish temperature to avoid sigma phase before the anneal. | 690 | 880 | 28 | 29 HRC | 2 % IACS |
SADefault Solution Annealed + Quenched | Standard as-supplied condition for plate, tube, bar and fittings; balanced ~50/50 ferrite–austenite with maximum corrosion resistance. | 700 | 900 | 30 | 29 HRC | 2 % IACS |
Cold Rolled + Solution Annealed | Thin sheet and strip for fabricated linings and formed parts, bright 2B finish with the best surface for polishing. | 710 | 910 | 30 | 29 HRC | 2 % IACS |
Cold Drawn + Solution Annealed Tube | Precision small-bore tube for umbilicals and seawater heat exchangers; annealed after drawing for full corrosion resistance. | 720 | 920 | 30 | 29 HRC | 2 % IACS |
Cold worked | Choose when maximum strength is needed in umbilical tube or springs; corrosion resistance is retained but ductility and toughness drop sharply. | 900 | 1,050 | 15 | 34 HRC | 2 % IACS |
Supply forms, finishes and certifications
Ways S32906 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
CD-BAR | Cold Drawn Bar | Supply form |
What is S32906?
S32906 (1.4477, SAF 2906) is a high-strength super duplex stainless steel formulated with lower nickel than 2507 to reduce sensitivity to nickel price swings while retaining similar corrosion performance. Solution-annealed, cold-worked and forged plate, bar and tube give 700 MPa yield, 900 MPa tensile, 30% elongation and 285 HB (29 HRC) — the highest strength in this group. Maximum service temperature is 280 °C, machining and forming loads are high, and the only correct heat treatment is a full solution anneal plus quench. S32750 is the alternative where a higher nickel content is acceptable. S32906 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). S32906 has a yield strength of 700 MPa (102 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 92% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
What is S32906 used for?
- oil and gas process piping
- pressure vessels
- high-strength structural parts
Advantages
- Good corrosion resistance — 86/100, better than 94% of stainless steel grades
- High strength — 700 MPa (102 ksi), better than 92% of stainless steel grades
Limitations
- Limited service temperature — 280°C (536 °F), worse than 96% of stainless steel grades
- Difficult to machine — 22/100, worse than 95% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
S32906 properties
Typical room-temperature values for S32906-SA; bars are the position among stainless steel grades.
Physical3
S32906 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
S32906 has a yield strength of 700 MPa (102 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 92% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S32906 is rated for continuous service to 280°C (536 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), worse than 80% of stainless steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
S32906 conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (86/100), better than 94% of stainless steel grades.
Sustainability4
Producing a kilogram of S32906 takes about 72 MJ of energy and emits 5.2 kg of CO₂ — more than 83% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
S32906's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability good (60/100); 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. S32906 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S32906
Is S32906 easy to machine?
Very tough and work-hardening — use rigid setups, sharp carbide with positive rake, low speed/high feed, heavy flood coolant and avoid dwelling to prevent glazing.
Can S32906 be welded?
Weld with 25Cr super duplex filler (e.g. ER2594) using controlled heat input ~0.5–1.5 kJ/mm, interpass < 150 °C, Ar+2 %N₂ backing; no PWHT — a full solution anneal + quench is the only correct heat treatment.
Can S32906 be formed, bent or molded?
Cold form with 50 % more power than austenitics and generous springback allowance; hot form 950–1150 °C and always solution anneal and water quench afterwards to restore phase balance.
S32906 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 | 0.8 – 1.5 | 1 |
| P | ≤ 0.03 | |
| S | ≤ 0.03 | |
| Cr | 28 – 30 | 29 |
| Nilower Ni than 2507 | 5.8 – 7.5 | 6.5 |
| Mo | 1.5 – 2.6 | 2 |
| Naustenite stabiliser, raises PREN | 0.3 – 0.4 | 0.35 |
| Cu | ≤ 0.8 | 0.3 |
| Fe | balance |
What surface finishes work on S32906?
Pickle in HNO₃/HF or bead blast plus passivation to remove weld heat tint — residual oxide scale is the main cause of premature pitting; electropolishing gives the best seawater performance.
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 S32906 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 1.4477
- Trade names
- SAF 2906
How much does S32906 cost?
S32906 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.
S32906 — frequently asked
What is S32906 used for?
S32906 is typically used for oil and gas process piping, pressure vessels and high-strength structural parts. In short: highest-strength super duplex here; lean-nickel 2507 substitute; 700 MPa minimum yield.
What is the yield strength of S32906?
S32906 has a typical yield strength of 700 MPa (102 ksi) and a tensile strength of 900 MPa (131 ksi) — stronger than 92% of stainless steel grades. Strength varies by condition: see the 7 listed tempers.
Is S32906 easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of stainless steel grades). Very tough and work-hardening — use rigid setups, sharp carbide with positive rake, low speed/high feed, heavy flood coolant and avoid dwelling to prevent glazing.
Can S32906 be welded?
Yes — weldability is rated good (60/100). Weld with 25Cr super duplex filler (e.g. ER2594) using controlled heat input ~0.5–1.5 kJ/mm, interpass < 150 °C, Ar+2 %N₂ backing; no PWHT — a full solution anneal + quench is the only correct heat treatment.
What surface finishes work on S32906?
Pickle in HNO₃/HF or bead blast plus passivation to remove weld heat tint — residual oxide scale is the main cause of premature pitting; electropolishing gives the best seawater performance.
Can S32906 be formed, bent or molded?
Cold form with 50 % more power than austenitics and generous springback allowance; hot form 950–1150 °C and always solution anneal and water quench afterwards to restore phase balance.
What is the maximum service temperature of S32906?
S32906 is rated for continuous use to about 280°C (536 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between S32906-SA and S32906-CW?
SA is the default condition — standard as-supplied condition for plate, tube, bar and fittings; balanced ~50/50 ferrite–austenite with maximum corrosion resistance. CW: choose when maximum strength is needed in umbilical tube or springs; corrosion resistance is retained but ductility and toughness drop sharply. Yield strength is 700 MPa in SA versus 900 MPa in CW.
How much does S32906 cost?
S32906 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 A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip — ASTM International (2023)
- ASTM A789/A790 — Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing and Pipe — ASTM International (2021)
- Sandvik SAF 2906 (UNS S32906) tube and bar datasheet — Alleima (Sandvik Materials Technology) (2022)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- Practical Guidelines for the Fabrication of Duplex Stainless Steels — IMOA / International Molybdenum Association (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.