Stainless Steel S39274 CW-80
Supply condition
UNS S39274
CW-80 = cold worked, 80 ksi (552 MPa) minimum yield
Lightly cold-worked tubing/umbilical grade where 80 ksi yield and maximum ductility are required.
Values for the CW-80 condition
Other S39274 tempers and conditions
S39274 is listed in 7 conditions; see the grade overview at S39274.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
CW-80This page 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 CW-80?
S39274 CW-80 is S39274 supplied in the CW-80 condition — lightly cold-worked tubing/umbilical grade where 80 ksi yield and maximum ductility are required. S39274 CW-80 has a yield strength of 590 MPa (85.6 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 86% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 200 GPa (29 Msi). S39274 CW-80 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; CW-80 is available on request or by drawing note.
Advantages
- Good corrosion resistance — 87/100, better than 95% of stainless steel grades
- High strength — 590 MPa (85.6 ksi), better than 86% of stainless steel grades
Limitations
- Difficult to machine — 21/100, worse than 97% 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
- Difficult to weld — 52/100, worse than 76% of stainless steel grades
S39274 CW-80 properties
Typical room-temperature values for S39274 CW-80; 22 are specific to this condition. Other listed values are S39274 reference data and may not represent this condition. Bars are the position among stainless steel grades.
Physical3
S39274 CW-80 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 CW-80 has a yield strength of 590 MPa (85.6 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 86% of stainless steel grades. Elongation at break is 28% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
S39274 CW-80 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 CW-80 conducts electricity at 2 % IACS, worse than 77% of stainless steel grades.
Chemical & Environmental3
Corrosion resistance is excellent (87/100), better than 95% of stainless steel grades.
Sustainability4
Producing a kilogram of S39274 CW-80 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 CW-80's machinability is poor (21/100, worse than 97% of stainless steel grades); weldability fair (52/100); formability poor (34/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with S39274 CW-80
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.
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.
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 | — |
S39274 CW-80 — frequently asked
What is S39274 CW-80 used for?
S39274 CW-80 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 CW-80?
S39274 CW-80 has a typical yield strength of 590 MPa (85.6 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 86% of stainless steel grades. Strength varies by condition: see the 7 listed tempers.
Is S39274 CW-80 easy to machine?
Not especially — machinability is rated poor (21/100, worse than 97% 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 CW-80 be welded?
With care — weldability is rated fair (52/100). 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 CW-80?
Pickle and passivate (HNO₃/HF) after welding to remove heat tint; electropolishing gives the best crevice/pitting performance — no anodizing.
Can S39274 CW-80 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 CW-80?
S39274 CW-80 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.