Stainless Steel
Stainless Steel S32707
Properties, tempers, machining, finishes and uses — values shown for the SA condition.
S32707 (SAF 2707 HD) is a hyper-duplex stainless steel at approximately 27Cr-7Ni-5Mo-N with PREN above 45, positioned above standard super duplex for extreme chloride and higher-temperature service.
Reference datasheet — S32707 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.
What is S32707?
S32707 (SAF 2707 HD) is a hyper-duplex stainless steel at approximately 27Cr-7Ni-5Mo-N with PREN above 45, positioned above standard super duplex for extreme chloride and higher-temperature service. It combines 800 MPa yield, 980 MPa tensile and 30 % elongation at about 300 HB (30 HRC) with a corrosion rating of 93, and is supplied as solution-annealed bar, tube, plate and forgings. The trade-offs are cost, limited availability, low machinability (rating 22) and a 300 °C service ceiling with strict heat-input and cooling control; S32750 or S32760 super duplex covers less aggressive seawater duty. S32707 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,345°C (2,453 °F). S32707 has a yield strength of 800 MPa (116 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 97% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
What is S32707 used for?
- subsea and offshore piping
- desalination equipment
- heat exchangers in seawater service
- chemical tankers
Advantages
- Good corrosion resistance — 93/100, better than 100% of stainless steel grades
- High strength — 800 MPa (116 ksi), better than 97% of stainless steel grades
Limitations
- Difficult to machine — 22/100, worse than 95% of stainless steel grades
- Low electrical conductivity — 1.7 % IACS, worse than 93% of stainless steel grades
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- High embodied carbon — 6 kg CO₂/kg, worse than 88% of stainless steel grades
- Poor heat conductor — 13 W/m·K (7.51 BTU/hr·ft·°F), worse than 85% of stainless steel grades
S32707 properties
Typical room-temperature values for S32707-SA (standard supply condition for tube, plate and bar; best corrosion resistance and balanced 50/50 phase structure), compiled from standards, handbooks and producer data. Each bar shows where the value sits among the stainless steel grades in FabDigit's library — further right is higher. Other conditions have their own pages: see tempers.
Physical3
S32707 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,345°C (2,453 °F).
Mechanical16
S32707 has a yield strength of 800 MPa (116 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 97% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S32707 is rated for continuous service to 300°C (572 °F). It conducts heat at 13 W/m·K (7.51 BTU/hr·ft·°F), worse than 85% of stainless steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
S32707 conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (93/100), better than 100% of stainless steel grades.
Sustainability4
Producing a kilogram of S32707 takes about 62 MJ of energy and emits 6 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 60%.
Manufacturability7
S32707'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.
S32707 tempers and conditions
S32707 is supplied in 6 conditions, each with its own property set. Open one for its full datasheet. SA is what FabDigit quotes unless the drawing says otherwise.
- SADefaultStandard supply condition for tube, plate and bar; best corrosion resistance and balanced 50/50 phase structure.800 MPa yield · 30 HRC
- CDChoose for higher strength shafting, fasteners and downhole components where extra yield strength is needed and forming is complete.950 MPa yield · 35 HRC
4 further conditions are listed below with a summary only.
| Condition | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution annealed and water quenched (~1080–1120 °C) | Standard supply condition for tube, plate and bar; best corrosion resistance and balanced 50/50 phase structure. | 800 | 980 | 30 | 30 HRC | — |
cold pilgered / cold drawn then solution annealed and quenched | Seamless heat-exchanger and umbilical tubing to ASTM A789/A790 — the dominant commercial form of this grade. | 830 | 1,000 | 30 | 31 HRC | — |
hot rolled plate, solution annealed, quenched and pickled | Plate for vessels, tube sheets and weld fabrications where thick sections need a fully annealed structure. | 780 | 960 | 32 | 295 HB | — |
cold drawn / cold worked bar and tube (as-drawn, not re-annealed) | Choose for higher strength shafting, fasteners and downhole components where extra yield strength is needed and forming is complete. | 950 | 1,100 | 18 | 35 HRC | — |
hot forged bar/flange/fitting, solution annealed and quenched | Flanges, valve bodies and subsea fittings (ASTM A182/A815 style) where section size is large and toughness is qualified. | 770 | 950 | 28 | 30 HRC | — |
as-welded weld metal / weldment (matching or overalloyed filler, no PWHT) | Design condition for fabricated joints: strength is retained but toughness and pitting resistance drop unless a solution anneal follows. | 720 | 930 | 22 | — | — |
Working with S32707
Is S32707 easy to machine?
Very difficult: high strength and work-hardening — use rigid setups, sharp coated carbide, low speed / heavy positive feed, flood coolant and avoid dwelling.
Can S32707 be welded?
GTAW/GMAW/SMAW with matching hyper-duplex or overalloyed filler, low interpass (<100 °C) and controlled heat input to keep ferrite 35–60 % and avoid σ/χ precipitation; no preheat, no PWHT unless full re-solution anneal.
Can S32707 be formed, bent or molded?
Hot work 1050–1200 °C with rapid cooling to below 900 °C; cold forming needs ~2× the load of austenitic grades with high springback — solution anneal (1080–1120 °C + water quench) after heavy cold work.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. S32707 is highlighted; hover a dot for its name, or open the interactive family chart.
S32707 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 | ≤ 1.5 | 1 |
| P | ≤ 0.04 | — |
| S | ≤ 0.01 | — |
| Cr | 26 – 29 | 27 |
| Ni | 5.5 – 9.5 | 6.5 |
| Mo | 4 – 5 | 4.8 |
| Nkey austenite stabiliser / PREN contributor | 0.3 – 0.5 | 0.4 |
| Cu | ≤ 1 | 0.3 |
| Comax, optional addition | ≤ 2 | 1 |
| Fe | balance | — |
What surface finishes work on S32707?
Pickle and passivate (HNO₃/HF) after hot work or welding to restore the passive film; mechanical polish or electropolish for biofouling/crevice-sensitive service; do not use carbon-steel contaminated tools.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing.
Passivation
- Pickling
Plating
- Electroless Nickel (EN)
- Gold Plating
- Hard Chrome Plating
- Silver Plating
Organic Coating
- Epoxy Coating
Thermal Spray
- Plasma Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel S32707 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Trade names
- SAF 2707 HD
- Also called
How much does S32707 cost?
S32707 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.
S32707 — frequently asked
What is S32707 used for?
S32707 is typically used for subsea and offshore piping, desalination equipment, heat exchangers in seawater service and chemical tankers. In short: hyper-duplex, PREN above 45; highest chloride pitting resistance; difficult to machine.
What is the yield strength of S32707?
S32707 has a typical yield strength of 800 MPa (116 ksi) and a tensile strength of 980 MPa (142 ksi) — stronger than 97% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is S32707 easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of stainless steel grades). Very difficult: high strength and work-hardening — use rigid setups, sharp coated carbide, low speed / heavy positive feed, flood coolant and avoid dwelling.
Can S32707 be welded?
Yes — weldability is rated good (55/100). GTAW/GMAW/SMAW with matching hyper-duplex or overalloyed filler, low interpass (<100 °C) and controlled heat input to keep ferrite 35–60 % and avoid σ/χ precipitation; no preheat, no PWHT unless full re-solution anneal.
What surface finishes work on S32707?
Pickle and passivate (HNO₃/HF) after hot work or welding to restore the passive film; mechanical polish or electropolish for biofouling/crevice-sensitive service; do not use carbon-steel contaminated tools.
Can S32707 be formed, bent or molded?
Hot work 1050–1200 °C with rapid cooling to below 900 °C; cold forming needs ~2× the load of austenitic grades with high springback — solution anneal (1080–1120 °C + water quench) after heavy cold work.
What is the maximum service temperature of S32707?
S32707 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 S32707-SA and S32707-CD?
SA is the default condition — standard supply condition for tube, plate and bar; best corrosion resistance and balanced 50/50 phase structure. CD: choose for higher strength shafting, fasteners and downhole components where extra yield strength is needed and forming is complete. Yield strength is 800 MPa in SA versus 950 MPa in CD.
How much does S32707 cost?
S32707 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 A789/A790 — Seamless and welded ferritic/austenitic stainless steel tubing (UNS S32707) — ASTM International (2023)
- ASTM A240 — Chromium and chromium-nickel stainless steel plate, sheet and strip — ASTM International (2023)
- Sandvik SAF 2707 HD (UNS S32707) hyper-duplex tube 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.