Stainless Steel S39274
UNS S39274
S39274 (DP3W) is a tungsten- and copper-modified super duplex stainless steel developed by Sumitomo for improved resistance to localized corrosion in sour, chloride-rich oilfield environments.
Reference datasheet — S39274 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the SA condition
S39274 tempers and conditions
S39274 is supplied in 7 conditions, soft to hard. SA is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Cold worked, 80 ksi (552 MPa) minimum yield | Lightly cold-worked tubing/umbilical grade where 80 ksi yield and maximum ductility are required. | 590 | 800 | 28 | 28 HRC | 2 % IACS |
hot forged, solution annealed and quenched (fittings/valve bodies) | Choose for forged flanges, valve bodies, wellhead components and thick sections where through-thickness toughness matters. | 600 | 840 | 28 | 28 HRC | 2 % IACS |
SADefault Solution annealed (~1100 °C) and water quenched | Standard stocked condition for plate, seamless pipe, tube and bar per ASTM A790/A789/A240-type practice; best corrosion resistance and toughness. | 620 | 860 | 30 | 27 HRC | — |
Cold worked, 95 ksi (655 MPa) minimum yield | Mid-strength cold-drawn OCTG/line-pipe condition balancing strength and SSC resistance. | 700 | 850 | 25 | 30 HRC | 2 % IACS |
Cold worked, 110 ksi (758 MPa) minimum yield | Most common downhole tubing strength level for sour, high-chloride wells; still within NACE MR0175 duplex hardness limits. | 810 | 900 | 22 | 32 HRC | 2 % IACS |
Cold worked, 125 ksi (862 MPa) minimum yield | High-strength tubing for deep, high-pressure sour wells; verify H₂S partial pressure and hardness against MR0175 limits. | 910 | 980 | 18 | 34 HRC | 2 % IACS |
Cold worked, 140 ksi (965 MPa) minimum yield | Maximum-strength cold-worked condition for ultra-deep completions; restricted service — requires case-by-case SSC qualification. | 1,000 | 1,050 | 16 | 36 HRC | 2 % IACS |
What is S39274?
S39274 (DP3W) is a tungsten- and copper-modified super duplex stainless steel developed by Sumitomo for improved resistance to localized corrosion in sour, chloride-rich oilfield environments. Solution-annealed bar and forgings provide 620 MPa yield, 860 MPa tensile, 30% elongation and 270 HB (27 HRC), and cold-worked conditions are stocked at 80, 95, 110, 125 and 140 ksi yield levels for downhole hardware. Service is limited to about 300 °C by sigma and 475 °C embrittlement, machining is slow, and mill availability is narrow. S32750 or S32760 are the more widely stocked alternatives. S39274 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). S39274 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 30% and the elastic modulus is 200 GPa (29 Msi).
What is S39274 used for?
- oilfield tubulars
- downhole equipment
- sour service piping
Advantages
- Good corrosion resistance — 88/100, better than 97% of stainless steel grades
- High strength — 620 MPa (89.9 ksi), better than 88% of stainless steel grades
Limitations
- Difficult to machine — 22/100, worse than 95% of stainless steel grades
- Limited service temperature — 300°C (572 °F), worse than 90% of stainless steel grades
- Low electrical conductivity — 2 % IACS, worse than 77% of stainless steel grades
S39274 properties
Typical room-temperature values for S39274-SA; bars are the position among stainless steel grades.
Physical3
S39274 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
S39274 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 30% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S39274 is rated for continuous service to 300°C (572 °F). It conducts heat at 14 W/m·K (8.09 BTU/hr·ft·°F), worse than 80% of stainless steel grades. Thermal expansion is 13 µm/m·K (7.22 µin/in·°F).
Electrical3
S39274 conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), better than 97% of stainless steel grades.
Sustainability4
Producing a kilogram of S39274 takes about 70 MJ of energy and emits 5.2 kg of CO₂ — more than 81% of stainless steel grades. Typical recycled content is 45%.
Manufacturability7
S39274's machinability is poor (22/100, worse than 95% of stainless steel grades); weldability good (58/100); formability fair (40/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the stainless steel family
Yield strength against density for every stainless steel grade FabDigit runs. S39274 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with S39274
Is S39274 easy to machine?
Machines like a tough super duplex: rigid setups, positive-rake coated carbide, low speed / heavy positive feed to cut under the work-hardened layer, and copious high-pressure coolant.
Can S39274 be welded?
GTAW/GMAW/SMAW with 25Cr super duplex or Ni-base filler; keep heat input ~0.5–1.5 kJ/mm, interpass <150 °C, back-purge with Ar (+N₂) and avoid autogenous welds to hold 35–55% ferrite.
Can S39274 be formed, bent or molded?
Hot work 1000–1200 °C then solution anneal ~1080–1120 °C with rapid water quench; cold forming needs roughly twice the load of 316L with high springback.
S39274 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 | ≤ 0.8 | 0.35 |
| Mn | ≤ 1 | 0.6 |
| P | ≤ 0.03 | 0.02 |
| S | ≤ 0.02 | 0 |
| Cr | 24 – 26 | 25 |
| Ni | 6 – 8 | 7 |
| Mo | 2.5 – 3.5 | 3 |
| Wtungsten addition boosts pitting/crevice resistance | 1.5 – 2.5 | 2 |
| Cu | 0.2 – 0.8 | 0.5 |
| N | 0.24 – 0.32 | 0.28 |
| Fe | balance |
What surface finishes work on S39274?
Pickle and passivate (HNO₃/HF) after welding to remove heat tint; electropolishing gives the best crevice/pitting performance — no anodizing.
Surface treatments FabDigit runs on stainless steel parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Passivation
Organic Coating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Stainless Steel S39274 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Trade names
- DP3W
How much does S39274 cost?
S39274 is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
S39274 — frequently asked
What is S39274 used for?
S39274 is typically used for oilfield tubulars, downhole equipment and sour service piping. In short: W+Cu modified super duplex; cold-worked to 140 ksi; sour service oilfield grade.
What is the yield strength of S39274?
S39274 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 7 listed tempers.
Is S39274 easy to machine?
Not especially — machinability is rated poor (22/100, worse than 95% of stainless steel grades). Machines like a tough super duplex: rigid setups, positive-rake coated carbide, low speed / heavy positive feed to cut under the work-hardened layer, and copious high-pressure coolant.
Can S39274 be welded?
Yes — weldability is rated good (58/100). GTAW/GMAW/SMAW with 25Cr super duplex or Ni-base filler; keep heat input ~0.5–1.5 kJ/mm, interpass <150 °C, back-purge with Ar (+N₂) and avoid autogenous welds to hold 35–55% ferrite.
What surface finishes work on S39274?
Pickle and passivate (HNO₃/HF) after welding to remove heat tint; electropolishing gives the best crevice/pitting performance — no anodizing.
Can S39274 be formed, bent or molded?
Hot work 1000–1200 °C then solution anneal ~1080–1120 °C with rapid water quench; cold forming needs roughly twice the load of 316L with high springback.
What is the maximum service temperature of S39274?
S39274 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 S39274-SA and S39274 CW-140?
SA is the default condition — standard stocked condition for plate, seamless pipe, tube and bar per ASTM A790/A789/A240-type practice; best corrosion resistance and toughness. CW-140: maximum-strength cold-worked condition for ultra-deep completions; restricted service — requires case-by-case SSC qualification. Yield strength is 620 MPa in SA versus 1,000 MPa in CW-140.
How much does S39274 cost?
S39274 is a high-cost stainless steel ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM A790/A790M — Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe — ASTM International (2023)
- ASTM A789/A789M — Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service — ASTM International (2023)
- API 5CRA — Corrosion Resistant Alloy Seamless Tubes for Use as Casing, Tubing and Coupling Stock — American Petroleum Institute (2021)
- ANSI/NACE MR0175 / ISO 15156-3 — Cracking-resistant CRAs for H₂S service — NACE/ISO (2020)
- DP3W (UNS S39274) super duplex stainless steel OCTG data — Sumitomo Metal Industries / Nippon Steel (2019)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels, and High-Performance Alloys — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.