Stainless Steel S39277-AW (As-welded deposit)
Heat-treated state
UNS S39277
Property reference for welded joints made without post-weld solution anneal; ferrite balance and toughness are the controlling checks.
Values for the AW condition
Other S39277 tempers and conditions
S39277 is listed in 4 conditions; see the grade overview at S39277.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AWThis page As-welded deposit | Property reference for welded joints made without post-weld solution anneal; ferrite balance and toughness are the controlling checks. | 620 | 860 | 22 | 27 HRC | 2 % IACS |
SADefault Solution Annealed | Standard supply condition for plate, bar, forgings and pipe — balanced ~50/50 ferrite/austenite with maximum corrosion resistance. | 640 | 880 | 30 | 28 HRC | 2 % IACS |
Forged and solution annealed (ASTM A182 forging condition) | Wellhead bodies, valve blocks, flanges and hangers where NACE MR0175 hardness limits (≤34 HRC) must be met. | 660 | 890 | 28 | 29 HRC | 2 % IACS |
Cold drawn | Pick when yield strengths above 750 MPa are needed (umbilical tubing, downhole components) and NACE hardness caps allow it. | 830 | 1,000 | 18 | 33 HRC | 2 % IACS |
What is S39277-AW?
S39277-AW is S39277 heat treated to AW — property reference for welded joints made without post-weld solution anneal; ferrite balance and toughness are the controlling checks. S39277-AW has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 860 MPa (125 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi). S39277-AW has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,350°C (2,462 °F). SA is the default condition FabDigit quotes; AW is available on request or by drawing note.
Advantages
- High strength — 620 MPa (89.9 ksi), better than 88% of stainless steel grades
- Good corrosion resistance — 80/100, better than 88% of stainless steel grades
Limitations
- Limited service temperature — 280°C (536 °F), worse than 96% of stainless steel grades
- Difficult to machine — 22/100, worse than 95% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
- Limited ductility — 22%, worse than 75% of stainless steel grades
S39277-AW properties
Typical room-temperature values for S39277-AW; 22 are specific to this condition. Other listed values are S39277 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S39277-AW has a density of 7.8 g/cm³ (0.282 lb/in³), heavier than 50% of stainless steel grades. It melts at 1,350°C (2,462 °F).
Mechanical16
S39277-AW has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 860 MPa (125 ksi) — stronger than 88% of stainless steel grades. Elongation at break is 22% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S39277-AW is rated for continuous service to 280°C (536 °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
S39277-AW conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 88% of stainless steel grades.
Sustainability4
Producing a kilogram of S39277-AW takes about 62 MJ of energy and emits 5.2 kg of CO₂ — more than 75% of stainless steel grades. Typical recycled content is 55%.
Manufacturability7
S39277-AW's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability good (55/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S39277-AW
Is S39277 easy to machine?
Machine like super duplex: rigid setups, sharp coated carbide, 40–70 % of 316L speeds, heavy positive feed to cut under the work-hardened layer, and copious high-pressure coolant.
Can S39277 be welded?
GTAW/GMAW/SMAW with over-alloyed 25Cr-10Ni-4Mo or Ni-base (ERNiCrMo-x for root/overlay); keep heat input ~0.5–1.5 kJ/mm, interpass ≤150 °C, N₂-bearing backing gas, no PWHT unless a full 1080–1120 °C solution anneal + quench is possible.
Can S39277 be formed, bent or molded?
Hot form at 1000–1200 °C followed by full solution anneal and water quench; cold forming needs ~2× the force of austenitic grades with large springback allowance and a stress-relief anneal for heavily worked parts.
What surface finishes work on S39277?
Pickle (HNO₃/HF) and passivate after welding or grinding to restore the Cr-rich film; electropolishing gives the best CPT — never anodize, and avoid carbon-steel tooling contamination.
S39277 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 carbide precipitation | ≤ 0.03 | 0.02 |
| Si | ≤ 0.8 | 0.4 |
| Mn | ≤ 0.8 | 0.5 |
| P | ≤ 0.03 | 0.02 |
| Svery low S for sour service and hot workability | ≤ 0 | 0 |
| Cr | 24 – 26 | 25 |
| Ni | 6.5 – 8 | 7.2 |
| Mo | 3 – 4 | 3.5 |
| Cuimproves resistance in reducing acids | 1.2 – 2 | 1.6 |
| Wraises PREN with Mo | 0.8 – 1.2 | 1 |
| Naustenite stabiliser, pitting resistance | 0.23 – 0.33 | 0.28 |
| Fe | balance | — |
S39277-AW — frequently asked
What is S39277-AW used for?
S39277-AW is typically used for subsea components, high-pressure fittings and oilfield equipment. In short: cu/W-modified super duplex; near hyper-duplex corrosion resistance; low machinability, high tooling cost.
What is the yield strength of S39277-AW?
S39277-AW has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 860 MPa (125 ksi) — stronger than 88% of stainless steel grades. Strength varies by condition: see the 4 listed tempers.
Is S39277-AW easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of stainless steel grades). Machine like super duplex: rigid setups, sharp coated carbide, 40–70 % of 316L speeds, heavy positive feed to cut under the work-hardened layer, and copious high-pressure coolant.
Can S39277-AW be welded?
Yes — weldability is rated good (55/100). GTAW/GMAW/SMAW with over-alloyed 25Cr-10Ni-4Mo or Ni-base (ERNiCrMo-x for root/overlay); keep heat input ~0.5–1.5 kJ/mm, interpass ≤150 °C, N₂-bearing backing gas, no PWHT unless a full 1080–1120 °C solution anneal + quench is possible.
What surface finishes work on S39277-AW?
Pickle (HNO₃/HF) and passivate after welding or grinding to restore the Cr-rich film; electropolishing gives the best CPT — never anodize, and avoid carbon-steel tooling contamination.
Can S39277-AW be formed, bent or molded?
Hot form at 1000–1200 °C followed by full solution anneal and water quench; cold forming needs ~2× the force of austenitic grades with large springback allowance and a stress-relief anneal for heavily worked parts.
What is the maximum service temperature of S39277-AW?
S39277-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 S39277-SA and S39277-CD?
SA is the default condition — standard supply condition for plate, bar, forgings and pipe — balanced ~50/50 ferrite/austenite with maximum corrosion resistance. CD: pick when yield strengths above 750 MPa are needed (umbilical tubing, downhole components) and NACE hardness caps allow it. Yield strength is 640 MPa in SA versus 830 MPa in CD.
Sources
- ASTM A182/A182M — Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Fittings, Valves and Parts — ASTM International (2023)
- ASTM A789/A790 — Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing and Pipe — ASTM International (2021)
- ANSI/NACE MR0175 / ISO 15156-3 — Cracking-Resistant CRAs for H₂S Service — NACE/ISO (2020)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys (duplex stainless steels) — ASM International (1990)
- Super duplex 25Cr Cu/W-modified grade datasheets (Industeel AF918, Sumitomo DP3W class) — Producer datasheets (2021)
- IMOA Practical Guidelines for the Fabrication of Duplex Stainless Steels — International Molybdenum Association (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.