Stainless Steel S32707 · other
Stainless Steel S32707 HR-SA
Properties of the HR-SA condition, compared with the other S32707 tempers.
Plate for vessels, tube sheets and weld fabrications where thick sections need a fully annealed structure.
What is S32707 HR-SA?
S32707 HR-SA is S32707 in the HR-SA condition — plate for vessels, tube sheets and weld fabrications where thick sections need a fully annealed structure. S32707 HR-SA has a yield strength of 780 MPa (113 ksi) and a tensile strength of 960 MPa (139 ksi) — stronger than 95% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 200 GPa (29 Msi). S32707 HR-SA 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). SA is the default condition FabDigit quotes; HR-SA is available on request or by drawing note.
Advantages
- Good corrosion resistance — 92/100, better than 99% of stainless steel grades
- High strength — 780 MPa (113 ksi), better than 95% 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 HR-SA properties
Typical room-temperature values for S32707 HR-SA — 6 properties are specific to this condition; the rest are grade-level values shared by every S32707 temper. Each bar shows where the value sits among the stainless steel grades in FabDigit's library — further right is higher.
Physical3
S32707 HR-SA 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 HR-SA has a yield strength of 780 MPa (113 ksi) and a tensile strength of 960 MPa (139 ksi) — stronger than 95% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S32707 HR-SA 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 HR-SA conducts electricity at 1.7 % IACS, worse than 93% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 99% of stainless steel grades.
Sustainability4
Producing a kilogram of S32707 HR-SA 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 HR-SA's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability good (55/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other S32707 tempers and conditions
S32707 is also supplied in 5 other conditions. The full side-by-side table is on the S32707 overview.
- 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
- HR-SAPlate for vessels, tube sheets and weld fabrications where thick sections need a fully annealed structure.780 MPa yield · 295 HB
Working with S32707 HR-SA
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.
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.
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 | — |
S32707 HR-SA — frequently asked
What is S32707 HR-SA used for?
S32707 HR-SA 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 HR-SA?
S32707 HR-SA has a typical yield strength of 780 MPa (113 ksi) and a tensile strength of 960 MPa (139 ksi) — stronger than 95% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is S32707 HR-SA 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 HR-SA 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 HR-SA?
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 HR-SA 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 HR-SA?
S32707 HR-SA 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.