Stainless Steel S32950 Annealed
Temper · default condition
UNS S32950
Standard supply condition for plate, bar, tube and fittings; best corrosion resistance and toughness.
Values for the Annealed condition
Other S32950 tempers and conditions
S32950 is listed in 5 conditions; see the grade overview at S32950.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Forged and Solution Annealed | Flanges, valve bodies and fittings; requires post-forge solution anneal and quench to restore phase balance. | 555 | 790 | 25 | 26 HRC | 2.2 % IACS |
AnnealedDefaultThis page Solution Annealed (≈1010–1120 °C, rapid quench) | Standard supply condition for plate, bar, tube and fittings; best corrosion resistance and toughness. | 560 | 800 | 27 | 26 HRC | 2.2 % IACS |
As-welded deposit | Reference condition for weld-joint design; over-alloyed filler (e.g. ER2209/25.10.4L) keeps austenite balance. | 560 | 780 | 22 | 27 HRC | 2.2 % IACS |
Cold drawn | Choose for shafts, fasteners and pump parts needing higher yield and tighter tolerance than annealed bar. | 700 | 880 | 20 | 31 HRC | 2.2 % IACS |
Cold worked | Springs, clamps and wire products where maximum strength outweighs ductility and toughness. | 830 | 1,000 | 14 | 35 HRC | 2.2 % IACS |
What is S32950 Annealed?
S32950 Annealed is S32950 in the Annealed temper — standard supply condition for plate, bar, tube and fittings; best corrosion resistance and toughness. S32950 Annealed has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 85% of stainless steel grades. Elongation at break is 27% and the elastic modulus is 200 GPa (29 Msi). S32950 Annealed has a density of 7.74 g/cm³ (0.28 lb/in³), lighter than 72% of stainless steel grades. It melts at 1,385°C (2,525 °F).
Advantages
- High strength — 560 MPa (81.2 ksi), better than 85% of stainless steel grades
- Good corrosion resistance — 78/100, better than 84% of stainless steel grades
Limitations
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
S32950 Annealed properties
Typical room-temperature values for S32950 Annealed; 23 are specific to this condition. Other listed values are S32950 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S32950 Annealed has a density of 7.74 g/cm³ (0.28 lb/in³), lighter than 72% of stainless steel grades. It melts at 1,385°C (2,525 °F).
Mechanical17
S32950 Annealed has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 85% of stainless steel grades. Elongation at break is 27% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S32950 Annealed is rated for continuous service to 300°C (572 °F). It conducts heat at 15.5 W/m·K (8.96 BTU/hr·ft·°F), better than 53% of stainless steel grades. Thermal expansion is 12.8 µm/m·K (7.11 µin/in·°F).
Electrical3
S32950 Annealed conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 84% of stainless steel grades.
Sustainability4
Producing a kilogram of S32950 Annealed takes about 62 MJ of energy and emits 4.6 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 65%.
Manufacturability7
S32950 Annealed's machinability is poor (30/100, worse than 70% of stainless steel grades); weldability very good (70/100); formability fair (45/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S32950 Annealed
Is S32950 easy to machine?
Machines like 2205 but tougher: use rigid setups, positive-rake carbide, 60–100 m/min surface speed, heavy feeds to cut through the work-hardened layer, and copious coolant.
Can S32950 be welded?
Readily welded by GTAW/GMAW/SMAW with over-alloyed 2209/25.10.4L filler, no preheat, low-to-moderate heat input (≈0.5–2.0 kJ/mm), interpass below 150 °C, Ar+N₂ backing; avoid PWHT unless a full solution anneal and quench is possible.
Can S32950 be formed, bent or molded?
Cold form with roughly twice the force of 316L and allow for high springback; hot work 950–1150 °C followed by mandatory solution anneal and rapid quench.
What surface finishes work on S32950?
Pickle in HNO₃/HF and passivate per ASTM A380/A967 to restore the chromium oxide film; can be mechanically ground or polished, not anodizable.
S32950 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 | ≤ 0.6 | 0.4 |
| Mn | ≤ 2 | 1 |
| P | ≤ 0.04 | — |
| S | ≤ 0.01 | — |
| Cr | 26 – 29 | 27.5 |
| Ni | 3.5 – 5.2 | 4.3 |
| Mo | 1 – 2.5 | 1.7 |
| N | 0.15 – 0.35 | 0.25 |
| Febalance, ≈64–66 % | balance | — |
S32950 Annealed — frequently asked
What is S32950 Annealed used for?
S32950 Annealed is typically used for pressure vessels, heat exchangers and chemical processing equipment. In short: between 2205 and super duplex; higher chloride resistance than 2205; 560 MPa yield in annealed plate.
What is the yield strength of S32950 Annealed?
S32950 Annealed has a typical yield strength of 560 MPa (81.2 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 85% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is S32950 Annealed easy to machine?
Not especially — machinability is rated poor (30/100, worse than 70% of stainless steel grades). Machines like 2205 but tougher: use rigid setups, positive-rake carbide, 60–100 m/min surface speed, heavy feeds to cut through the work-hardened layer, and copious coolant.
Can S32950 Annealed be welded?
Yes — weldability is rated very good (70/100). Readily welded by GTAW/GMAW/SMAW with over-alloyed 2209/25.10.4L filler, no preheat, low-to-moderate heat input (≈0.5–2.0 kJ/mm), interpass below 150 °C, Ar+N₂ backing; avoid PWHT unless a full solution anneal and quench is possible.
What surface finishes work on S32950 Annealed?
Pickle in HNO₃/HF and passivate per ASTM A380/A967 to restore the chromium oxide film; can be mechanically ground or polished, not anodizable.
Can S32950 Annealed be formed, bent or molded?
Cold form with roughly twice the force of 316L and allow for high springback; hot work 950–1150 °C followed by mandatory solution anneal and rapid quench.
What is the maximum service temperature of S32950 Annealed?
S32950 Annealed 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 S32950 Annealed and S32950-CW?
Annealed is the default condition — standard supply condition for plate, bar, tube and fittings; best corrosion resistance and toughness. CW: springs, clamps and wire products where maximum strength outweighs ductility and toughness. Yield strength is 560 MPa in Annealed versus 830 MPa in CW.
Sources
- ASTM A240/A240M — Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip — ASTM International (2023)
- ASTM A789/A790 — Duplex Stainless Steel Tubing and Pipe — ASTM International (2021)
- ASTM A182 / A815 — Forged Fittings and Flanges — ASTM International (2022)
- 7-Mo PLUS (UNS S32950) Duplex Stainless Alloy Data — Carpenter Technology (2020)
- 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 (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.