Stainless Steel S32950-AW (As-welded deposit)
Heat-treated state
UNS S32950
Reference condition for weld-joint design; over-alloyed filler (e.g. ER2209/25.10.4L) keeps austenite balance.
Values for the AW 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 |
AnnealedDefault 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 |
AWThis page 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-AW?
S32950-AW is S32950 heat treated to AW — reference condition for weld-joint design; over-alloyed filler (e.g. ER2209/25.10.4L) keeps austenite balance. S32950-AW has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 85% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi). S32950-AW 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). Annealed is the default condition FabDigit quotes; AW is available on request or by drawing note.
Advantages
- High strength — 560 MPa (81.2 ksi), better than 85% of stainless steel grades
Limitations
- Limited service temperature — 280°C (536 °F), worse than 96% of stainless steel grades
- Low fracture toughness — 70 MPa·√m (63.7 ksi·√in), worse than 83% of stainless steel grades
- Limited ductility — 22%, worse than 75% of stainless steel grades
S32950-AW properties
Typical room-temperature values for S32950-AW; 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-AW 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-AW has a yield strength of 560 MPa (81.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 85% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S32950-AW is rated for continuous service to 280°C (536 °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-AW conducts electricity at 2.2 % IACS, worse than 61% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 73% of stainless steel grades.
Sustainability4
Producing a kilogram of S32950-AW 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-AW's machinability is poor (28/100, worse than 79% of stainless steel grades); weldability very good (70/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S32950-AW
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-AW — frequently asked
What is S32950-AW used for?
S32950-AW 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-AW?
S32950-AW has a typical yield strength of 560 MPa (81.2 ksi) and a tensile strength of 780 MPa (113 ksi) — stronger than 85% of stainless steel grades. Strength varies by condition: see the 5 listed tempers.
Is S32950-AW easy to machine?
Not especially — machinability is rated poor (28/100, worse than 79% 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-AW 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-AW?
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-AW 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-AW?
S32950-AW is rated for continuous use to about 280°C (536 °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.