Stainless Steel S82121-ANN (Annealed)
Heat-treated state · default condition
UNS S82121
Standard mill condition for plate, sheet, bar, pipe and fittings — balanced 50/50 ferrite/austenite with best corrosion resistance and toughness.
Values for the ANN condition
Other S82121 tempers and conditions
S82121 is listed in 2 conditions; see the grade overview at S82121.
- ANN
- CD
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ANNDefaultThis page Annealed | Standard mill condition for plate, sheet, bar, pipe and fittings — balanced 50/50 ferrite/austenite with best corrosion resistance and toughness. | 530 | 750 | 32 | 220 HB | — |
Cold drawn | Use for shafts, fasteners and machined parts needing tighter tolerance, better surface and higher yield strength. | 720 | 880 | 18 | 27 HRC | 2.2 % IACS |
What is S82121-ANN?
S82121-ANN is S82121 heat treated to ANN — standard mill condition for plate, sheet, bar, pipe and fittings — balanced 50/50 ferrite/austenite with best corrosion resistance and toughness. S82121-ANN has a yield strength of 530 MPa (76.9 ksi) and a tensile strength of 750 MPa (109 ksi) — stronger than 81% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 200 GPa (29 Msi). S82121-ANN has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 57% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Advantages
- High strength — 530 MPa (76.9 ksi), better than 81% of stainless steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
S82121-ANN properties
Typical room-temperature values for S82121-ANN; 12 are specific to this condition. Other listed values are S82121 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S82121-ANN has a density of 7.78 g/cm³ (0.281 lb/in³), lighter than 57% of stainless steel grades. It melts at 1,400°C (2,552 °F).
Mechanical17
S82121-ANN has a yield strength of 530 MPa (76.9 ksi) and a tensile strength of 750 MPa (109 ksi) — stronger than 81% of stainless steel grades. Elongation at break is 32% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S82121-ANN 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
S82121-ANN conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 52% of stainless steel grades.
Sustainability4
Producing a kilogram of S82121-ANN takes about 52 MJ of energy and emits 4 kg of CO₂ — less than 76% of stainless steel grades. Typical recycled content is 70%.
Manufacturability8
S82121-ANN's machinability is poor (32/100, worse than 62% of stainless steel grades); weldability very good (70/100); formability good (55/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S82121-ANN
Is S82121 easy to machine?
Machines like 2205 but tougher than 304 — use rigid setups, positive-rake coated carbide, 20–30 % lower surface speed than 316, heavy constant feed to cut under the work-hardened layer, and flood coolant.
Can S82121 be welded?
Readily welded by GTAW/GMAW/SMAW/SAW with 2209 or matching lean-duplex filler; keep heat input roughly 0.5–2.0 kJ/mm, interpass <150 °C, use N2-added shielding/backing and no post-weld heat treatment below solution-annealing temperature.
Can S82121 be formed, bent or molded?
Cold forms well but needs ~2× the press force and larger bend allowance/overbend than 304 due to high yield and springback; hot form 950–1150 °C followed by full solution anneal and quench.
What surface finishes work on S82121?
Not anodizable — passivate per ASTM A967 or pickle (HNO3/HF) after welding, then mechanically polish or electropolish; always remove heat tint to restore full pitting resistance.
S82121 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 Cr-carbide precipitation | ≤ 0.04 | 0.02 |
| Mnaustenite stabiliser, raises N solubility | 2 – 4 | 3 |
| Si | ≤ 0.75 | 0.4 |
| P | ≤ 0.04 | 0.03 |
| S | ≤ 0.02 | 0 |
| Cr | 21 – 22.5 | 21.5 |
| Nilean nickel for cost stability | 2 – 4 | 2.5 |
| Mo | 0.3 – 1.3 | 0.6 |
| Cu | ≤ 0.5 | 0.3 |
| Nkey strengthening and pitting-resistance element | 0.15 – 0.25 | 0.19 |
| Fe | balance | — |
S82121-ANN — frequently asked
What is S82121-ANN used for?
S82121-ANN is typically used for tanks, structural fittings, pressure vessels and process equipment. In short: 21% Cr lean duplex; best weldability in family; low-nickel cost balance.
What is the yield strength of S82121-ANN?
S82121-ANN has a typical yield strength of 530 MPa (76.9 ksi) and a tensile strength of 750 MPa (109 ksi) — stronger than 81% of stainless steel grades. Strength varies by condition: see the 2 listed tempers.
Is S82121-ANN easy to machine?
Not especially — machinability is rated poor (32/100, worse than 62% of stainless steel grades). Machines like 2205 but tougher than 304 — use rigid setups, positive-rake coated carbide, 20–30 % lower surface speed than 316, heavy constant feed to cut under the work-hardened layer, and flood coolant.
Can S82121-ANN be welded?
Yes — weldability is rated very good (70/100). Readily welded by GTAW/GMAW/SMAW/SAW with 2209 or matching lean-duplex filler; keep heat input roughly 0.5–2.0 kJ/mm, interpass <150 °C, use N2-added shielding/backing and no post-weld heat treatment below solution-annealing temperature.
What surface finishes work on S82121-ANN?
Not anodizable — passivate per ASTM A967 or pickle (HNO3/HF) after welding, then mechanically polish or electropolish; always remove heat tint to restore full pitting resistance.
Can S82121-ANN be formed, bent or molded?
Cold forms well but needs ~2× the press force and larger bend allowance/overbend than 304 due to high yield and springback; hot form 950–1150 °C followed by full solution anneal and quench.
What is the maximum service temperature of S82121-ANN?
S82121-ANN 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 S82121-ANN and S82121-CD?
ANN is the default condition — standard mill condition for plate, sheet, bar, pipe and fittings — balanced 50/50 ferrite/austenite with best corrosion resistance and toughness. CD: use for shafts, fasteners and machined parts needing tighter tolerance, better surface and higher yield strength. Yield strength is 530 MPa in ANN versus 720 MPa in CD.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip — ASTM International (2023)
- ASTM A276/A479 — Stainless Steel Bars and Shapes — ASTM International (2022)
- SAE/ASTM DS-56 (UNS) Metals & Alloys in the Unified Numbering System — SAE International / ASTM (2017)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
- Lean duplex stainless steel datasheets (2101/2202/2003-type) — Outokumpu / Industeel / Nippon Steel (2022)
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.