Stainless Steel S32520
UNS S32520
S32520 (UR52N+) is a 25Cr super duplex stainless steel with nitrogen and a copper addition, supplied solution annealed as plate, bar, forgings and seamless or welded pipe (also hot- and cold-rolled and cold-drawn conditions).
Reference datasheet — S32520 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
S32520 tempers and conditions
S32520 is supplied in 6 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Forged, solution annealed and quenched | For flanges, valve bodies and heavy fittings; requires post-forge anneal to restore phase balance and dissolve sigma. | 600 | 830 | 27 | 26 HRC | 2 % IACS |
Hot rolled plate, solution annealed and quenched | Pick for pressure-vessel and tank plate; supplied hot rolled, annealed, pickled (1D/No.1 finish). | 610 | 840 | 30 | 26 HRC | 2 % IACS |
SADefault Solution annealed (~1050–1100 °C) and water quenched | Default condition for plate, bar, pipe and fittings — balanced 50/50 austenite/ferrite with no intermetallics, best corrosion and toughness. | 620 | 850 | 30 | 26 HRC | 2 % IACS |
Hot finished bar/billet, solution annealed | Standard round/flat bar for machined valve bodies, shafts and flanges up to large diameters. | 620 | 850 | 28 | 26 HRC | 2 % IACS |
Cold rolled sheet/strip, solution annealed and pickled | Thin sheet and strip for fabricated linings and formed parts where a smooth 2B surface is needed. | 640 | 870 | 28 | 27 HRC | 2 % IACS |
Cold drawn | Choose for small-diameter bar needing tight tolerance and higher yield strength; toughness and formability are reduced. | 780 | 950 | 18 | 31 HRC | 2 % IACS |
Supply forms, finishes and certifications
Ways S32520 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
SMLS+SA | Seamless pipe/tube, solution annealed | Supply form |
WLD+SA | Welded pipe/tube, solution annealed after welding | Supply form |
What is S32520?
S32520 (UR52N+) is a 25Cr super duplex stainless steel with nitrogen and a copper addition, supplied solution annealed as plate, bar, forgings and seamless or welded pipe (also hot- and cold-rolled and cold-drawn conditions). Engineers select it for 620 MPa yield, 850 MPa tensile and 30% elongation at 260 HB (26 HRC) together with resistance to sulfuric acid and chloride environments comparable to 2507. Service is capped near 300 °C because of sigma-phase and 475 °C embrittlement, heat input during welding must be controlled, and machinability is low. S32750/2507 is the nearest alternative when the copper addition is not required. S32520 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,385°C (2,525 °F). S32520 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
What is S32520 used for?
- desalination equipment
- chemical processing
- flue gas desulfurization
Advantages
- Good corrosion resistance — 85/100, better than 92% of stainless steel grades
- High strength — 620 MPa (89.9 ksi), better than 88% of stainless steel grades
Limitations
- 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
S32520 properties
Typical room-temperature values for S32520-SA; bars are the position among stainless steel grades.
Physical3
S32520 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,385°C (2,525 °F).
Mechanical16
S32520 has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S32520 is rated for continuous service to 300°C (572 °F). It conducts heat at 17 W/m·K (9.82 BTU/hr·ft·°F), better than 71% of stainless steel grades. Thermal expansion is 12.8 µm/m·K (7.11 µin/in·°F).
Electrical3
S32520 conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 92% of stainless steel grades.
Sustainability4
Producing a kilogram of S32520 takes about 65 MJ of energy and emits 4.8 kg of CO₂ — more than 79% of stainless steel grades. Typical recycled content is 60%.
Manufacturability6
S32520's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability very good (70/100); formability fair (45/100).
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. S32520 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S32520
Is S32520 easy to machine?
Machine like 2507: rigid setups, 20–30 % lower speeds than 316, positive-rake coated carbide, heavy constant feed and flood coolant to avoid work-hardened skins and dwell.
Can S32520 be welded?
GTAW/GMAW/SMAW with over-alloyed 25.10.4.L (Cu-bearing) filler, Ar+2 %N2 backing, interpass ≤150 °C and 0.5–2.5 kJ/mm heat input; no preheat, no PWHT unless a full solution anneal + quench is possible.
Can S32520 be formed, bent or molded?
Cold forms with roughly twice the force and springback of austenitics — use generous radii and over-bend; hot work 1000–1150 °C followed by mandatory solution anneal and water quench.
S32520 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 | ≤ 0.8 | 0.4 |
| Mn | ≤ 1.5 | 0.8 |
| P | ≤ 0.04 | |
| Smax; 0.005 typical | ≤ 0.02 | |
| Cr | 24 – 26 | 25 |
| Ni | 5.5 – 8 | 6.5 |
| Mo | 3 – 5 | 3.6 |
| Cucopper addition improves sulfuric acid resistance | 0.5 – 3 | 1.5 |
| N | 0.2 – 0.35 | 0.25 |
| Fe | balance |
What surface finishes work on S32520?
Pickle and passivate (or electropolish) after welding to remove heat tint; grinding must not smear the surface — bead-blast plus pickling paste gives the most reliable corrosion performance. Not anodizable.
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 S32520 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Trade names
- UR52N+
How much does S32520 cost?
S32520 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.
S32520 — frequently asked
What is S32520 used for?
S32520 is typically used for desalination equipment, chemical processing and flue gas desulfurization. In short: copper-bearing super duplex; sulfuric acid resistant; 2507-class chloride performance.
What is the yield strength of S32520?
S32520 has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 88% of stainless steel grades. Strength varies by condition: see the 6 listed tempers.
Is S32520 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% of stainless steel grades). Machine like 2507: rigid setups, 20–30 % lower speeds than 316, positive-rake coated carbide, heavy constant feed and flood coolant to avoid work-hardened skins and dwell.
Can S32520 be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW/SMAW with over-alloyed 25.10.4.L (Cu-bearing) filler, Ar+2 %N2 backing, interpass ≤150 °C and 0.5–2.5 kJ/mm heat input; no preheat, no PWHT unless a full solution anneal + quench is possible.
What surface finishes work on S32520?
Pickle and passivate (or electropolish) after welding to remove heat tint; grinding must not smear the surface — bead-blast plus pickling paste gives the most reliable corrosion performance. Not anodizable.
Can S32520 be formed, bent or molded?
Cold forms with roughly twice the force and springback of austenitics — use generous radii and over-bend; hot work 1000–1150 °C followed by mandatory solution anneal and water quench.
What is the maximum service temperature of S32520?
S32520 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 S32520-SA and S32520-CD?
SA is the default condition — default condition for plate, bar, pipe and fittings — balanced 50/50 austenite/ferrite with no intermetallics, best corrosion and toughness. CD: choose for small-diameter bar needing tight tolerance and higher yield strength; toughness and formability are reduced. Yield strength is 620 MPa in SA versus 780 MPa in CD.
How much does S32520 cost?
S32520 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 A479/A479M and A276 — Stainless Steel Bars and Shapes — ASTM International (2022)
- ASTM A790/A789 — Ferritic/Austenitic Stainless Steel Pipe and Tube — ASTM International (2022)
- EN 10088-1/-2 — Stainless steels, grade 1.4507 (X2CrNiMoCuN25-6-3) — CEN (2014)
- UR 52N+ (S32520/1.4507) super duplex stainless steel datasheet — Industeel / ArcelorMittal (2020)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- ASTM A923 — Detecting Detrimental Intermetallic Phase in Duplex Stainless Steels — ASTM International (2022)
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.