Stainless Steel S82121-CD (Cold drawn)
Supply condition
UNS S82121
Use for shafts, fasteners and machined parts needing tighter tolerance, better surface and higher yield strength.
Values for the CD 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 |
|---|---|---|---|---|---|---|
ANNDefault 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 | — |
CDThis page 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-CD?
S82121-CD is S82121 supplied in the CD condition — use for shafts, fasteners and machined parts needing tighter tolerance, better surface and higher yield strength. S82121-CD has a yield strength of 720 MPa (104 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 93% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi). S82121-CD 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). ANN is the default condition FabDigit quotes; CD is available on request or by drawing note.
Advantages
- High strength — 720 MPa (104 ksi), better than 93% of stainless steel grades
Limitations
- Limited service temperature — 250°C (482 °F), worse than 99% of stainless steel grades
- Limited ductility — 18%, worse than 83% of stainless steel grades
S82121-CD properties
Typical room-temperature values for S82121-CD; 23 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-CD 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-CD has a yield strength of 720 MPa (104 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 93% of stainless steel grades. Elongation at break is 18% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S82121-CD is rated for continuous service to 250°C (482 °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-CD conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 58% of stainless steel grades.
Sustainability4
Producing a kilogram of S82121-CD 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-CD's machinability is fair (38/100, better than 63% of stainless steel grades); weldability good (65/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S82121-CD
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-CD — frequently asked
What is S82121-CD used for?
S82121-CD 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-CD?
S82121-CD has a typical yield strength of 720 MPa (104 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 93% of stainless steel grades. Strength varies by condition: see the 2 listed tempers.
Is S82121-CD easy to machine?
Not especially — machinability is rated fair (38/100, better than 63% 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-CD be welded?
Yes — weldability is rated good (65/100). 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-CD?
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-CD 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-CD?
S82121-CD is rated for continuous use to about 250°C (482 °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.