Stainless Steel S82031
UNS S82031
S82031 is a molybdenum-bearing duplex stainless steel that sits between the plain Mn–N lean duplex grades and 2205, the Mo addition giving incrementally better pitting resistance (rated 66/100).
Reference datasheet — S82031 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 Annealed condition
S82031 tempers and conditions
S82031 is supplied in 4 conditions, soft to hard. Annealed 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 rolled/forged bar, solution annealed | Bar and forging stock per ASTM A276/A479 for shafts, flanges and valve bodies. | 590 | 760 | 34 | 23 HRC | 2.2 % IACS |
weld metal / HAZ, no post-weld solution anneal | Reference condition for fabricated joints: strength matches base metal but toughness and pitting resistance drop if ferrite exceeds ~65 %. | 600 | 760 | 25 | 25 HRC | 2.2 % IACS |
AnnealedDefault solution annealed and quenched (hot-rolled plate, 1D/1E finish) | Standard stocked condition for plate and pressure-vessel work; balanced ~50/50 ferrite-austenite, best corrosion and toughness. | 610 | 780 | 33 | 24 HRC | — |
Cold drawn | Choose for tight tolerance bar and higher strength fasteners/pins; reduced ductility and toughness. | 750 | 900 | 20 | 30 HRC | 2.2 % IACS |
Supply forms, finishes and certifications
Ways S82031 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
SmlsAnn-Tube | Seamless Annealed | Supply form |
WldAnn-Pipe | Welded & Annealed | Supply form |
2B | Cold rolled, annealed, pickled and skin-passed sheet/coil | Surface finish |
What is S82031?
S82031 is a molybdenum-bearing duplex stainless steel that sits between the plain Mn–N lean duplex grades and 2205, the Mo addition giving incrementally better pitting resistance (rated 66/100). Annealed product delivers 610 MPa yield, 780 MPa tensile, 33% elongation and about 245 HB (24 HRC), in plate, 2B sheet, hot-finished and cold-drawn bar, and welded or seamless annealed pipe and tube. The trade-offs are low machinability (35), formability of 48 and a 300 °C service limit; step up to S32205 for more demanding chloride service. S82031 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,400°C (2,552 °F). S82031 has a yield strength of 610 MPa (88.5 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 87% of stainless steel grades. Elongation at break is 33% and the elastic modulus is 200 GPa (29 Msi).
What is S82031 used for?
- process piping
- pressure equipment
- storage tanks
- structural components
Advantages
- High strength — 610 MPa (88.5 ksi), better than 87% of stainless steel grades
- Low embodied carbon — 3.6 kg CO₂/kg, better than 83% of stainless steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
S82031 properties
Typical room-temperature values for S82031-Annealed; bars are the position among stainless steel grades.
Physical3
S82031 has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical17
S82031 has a yield strength of 610 MPa (88.5 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 87% of stainless steel grades. Elongation at break is 33% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S82031 is rated for continuous service to 300°C (572 °F). It conducts heat at 15 W/m·K (8.67 BTU/hr·ft·°F), worse than 59% of stainless steel grades. Thermal expansion is 13 µm/m·K (7.22 µin/in·°F).
Electrical3
S82031 conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (66/100), better than 59% of stainless steel grades.
Sustainability4
Producing a kilogram of S82031 takes about 53 MJ of energy and emits 3.6 kg of CO₂ — less than 67% of stainless steel grades. Typical recycled content is 70%.
Manufacturability7
S82031's machinability is fair (35/100, better than 51% of stainless steel grades); weldability very good (70/100); formability fair (48/100).
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. S82031 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S82031
Is S82031 easy to machine?
Treat like 2205 at ~70 % of its speeds: rigid setup, sharp positive-rake carbide, heavy positive feed to cut under the work-hardened layer, and flood coolant.
Can S82031 be welded?
GTAW/GMAW/SMAW with 2209-type over-alloyed filler and Ar+1–2 % N2 shielding; keep heat input ~0.5–2.0 kJ/mm and interpass below 150 °C to hold 30–65 % ferrite.
Can S82031 be formed, bent or molded?
Cold form with ~2× the press force of 304 and generous overbend for springback; hot form 950–1150 °C followed by full solution anneal and water quench.
S82031 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 |
|---|---|---|
| Clow carbon to avoid sensitisation | ≤ 0.05 | 0.03 |
| Si | ≤ 1 | 0.5 |
| Mnraises N solubility | ≤ 2 | 1.4 |
| P | ≤ 0.04 | |
| S | ≤ 0.03 | |
| Cr | 19 – 22 | 20.7 |
| Nilean Ni — cost driver | 2 – 4 | 3 |
| MoMo addition vs Mn-N lean duplex | 0.6 – 1.4 | 1 |
| Naustenite stabiliser, boosts PREN and strength | 0.14 – 0.24 | 0.19 |
| Cu | ≤ 1 | 0.3 |
| Fe | balance |
What surface finishes work on S82031?
Pickle (HNO3/HF) or bead-blast plus passivation after welding to remove heat tint; electropolishing gives the best corrosion surface — 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
How much does S82031 cost?
S82031 is a standard-cost stainless steel ($$), cheaper than about 71% 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.
S82031 — frequently asked
What is S82031 used for?
S82031 is typically used for process piping, pressure equipment, storage tanks and structural components. In short: mo-bearing lean duplex; 610 MPa annealed yield; better pitting than S82011.
What is the yield strength of S82031?
S82031 has a typical yield strength of 610 MPa (88.5 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 87% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is S82031 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of stainless steel grades). Treat like 2205 at ~70 % of its speeds: rigid setup, sharp positive-rake carbide, heavy positive feed to cut under the work-hardened layer, and flood coolant.
Can S82031 be welded?
Yes — weldability is rated very good (70/100). GTAW/GMAW/SMAW with 2209-type over-alloyed filler and Ar+1–2 % N2 shielding; keep heat input ~0.5–2.0 kJ/mm and interpass below 150 °C to hold 30–65 % ferrite.
What surface finishes work on S82031?
Pickle (HNO3/HF) or bead-blast plus passivation after welding to remove heat tint; electropolishing gives the best corrosion surface — do not anodize.
Can S82031 be formed, bent or molded?
Cold form with ~2× the press force of 304 and generous overbend for springback; hot form 950–1150 °C followed by full solution anneal and water quench.
What is the maximum service temperature of S82031?
S82031 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 S82031 Annealed and S82031-CD?
Annealed is the default condition — standard stocked condition for plate and pressure-vessel work; balanced ~50/50 ferrite-austenite, best corrosion and toughness. CD: choose for tight tolerance bar and higher strength fasteners/pins; reduced ductility and toughness. Yield strength is 610 MPa in Annealed versus 750 MPa in CD.
How much does S82031 cost?
S82031 is a standard-cost stainless steel ($$), cheaper than about 71% 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 A790/A928 — Duplex Stainless Steel Pipe — ASTM International (2022)
- Practical Guidelines for the Fabrication of Duplex Stainless Steels — IMOA (2014)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
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.