Product Description
Welded Super Duplex Stainless Steel Pipe Size: Outside Diameter: 6.35mm – 1,219mm (1/4″ – 48″), Wall Thickness: 0.5mm – 50mm (Schedule 5S, 10S, 40S, 80S), Length: 6m – 12m standard, custom lengths up to 24m
Standard & Grade of Welded Super Duplex Pipe: ASTM A790 (pipe) / ASTM A789 (tubing) S32760; also UNS S32760; EN 10217-7 1.4501; Equivalent to Super Duplex 2507 with W+Cu, Zeron 100 (tradename)
Usage of Welded Super Duplex Pipe: Offshore oil and gas platforms (high-temperature seawater lift pumps, firewater, hydraulic lines), chemical processing (sulfuric acid, phosphoric acid, organic acids), flue gas desulfurization (FGD) absorbers and recirculation lines, marine exhaust scrubbers (SOx removal), desalination high-pressure brine piping, oil and gas sour service with high H₂S and chlorides, seawater reverse osmosis (SWRO) high-pressure piping, geothermal energy production, pulp and paper bleach plants, propeller shafts and marine components (high strength)
Womic Steel offering high quality & competitive prices of ASTM A790 S32760 welded super duplex stainless steel pipe, ERW super duplex pipe, EFW super duplex tube, high strength corrosion resistant pipe, seawater resistant pipe, NACE MR0175 compliant, Zeron 100 equivalent pipe. Mill certificate EN 10204 3.1/3.2, hydro test, UT, solution annealed, beveled/plain ends, pickled finish available. Factory direct supply for offshore, chemical, and marine projects worldwide.
Womic Steel: Manufacturing Capabilities & Company Strength
Womic Steel Group is a premier manufacturer and global exporter with over 20 years of expertise in producing super duplex stainless steel tubular products. Our specialized S32760 super duplex welded pipe production facility utilizes advanced welding technologies with extremely tight control of heat input to maintain the required ferrite/austenite balance (40-60%) and to prevent intermetallic phases (sigma, chi, and R-phase):
ERW (Electric Resistance Welding) Line: For diameters from 6.35mm to 610mm (1/4″ – 24″), wall thickness from 0.5mm to 12.7mm. High-frequency welding with very low heat input (≤ 1.2 kJ/mm) and immediate post-weld seam annealing. Ideal for small to medium diameter super duplex pipes.
EFW (Electric Fusion Welding) Line: For diameters from 219mm to 1219mm (8″ – 48″), wall thickness from 4.0mm to 50mm. TIG (GTAW) root pass with SAW fill passes, using nitrogen-rich backing gas and matching super duplex filler metal (ER2594 or ERNiCrMo-13).
LSAW / SAWL Line for Super Duplex: For diameters from 406mm to 1524mm (16″ – 60″), wall thickness up to 50mm. Double-sided SAW welding with controlled heat input (≤ 1.5 kJ/mm) and interpass temperature ≤ 100°C.
All super duplex stainless steel welded pipes undergo solution annealing (heat treatment) at 1070-1120°C followed by water quenching to restore the balanced austenite-ferrite microstructure, dissolve any intermetallic phases, and optimize corrosion resistance, followed by pickling and passivation.
Quality Certifications & Regulatory Compliance:
ISO 9001:2015 Certified
PED 2014/68/EU (CE Marking)
EN 10204 3.2 Certification with third-party validation (TÜV, BV, SGS, LR)
Third-Party Inspection (TPI) approved by SGS, BV, ABS, DNV, TÜV
NORSOK M-650 (mandatory for offshore super duplex applications)
DNV GL approval for super duplex pipes
NACE MR0175 / ISO 15156 for sour service (H₂S)
Womic Steel supplies super duplex welded pipes to over 40 countries across offshore, chemical, desalination, and marine industries.
Production Flexibility:
ERW: 6.35–610mm OD × 0.5–12.7mm WT × ≤ 12m
EFW: 219–1219mm OD × 4.0–50mm WT × ≤ 12m (longer upon request)
LSAW: 406–1524mm OD × 6.0–50mm WT × ≤ 18m
Finishing options: Annealed and pickled, bright annealed (for tubing)
ASTM A790 S32760: Material Composition & Performance Characteristics
UNS S32760 is a super duplex stainless steel with high chromium (25%), high molybdenum (3.5%), tungsten (0.5-1.0%), copper (0.5-1.0%), and high nitrogen (0.24-0.32%). Compared to S32750, the addition of tungsten and copper improves resistance to sulfuric and phosphoric acids while maintaining excellent pitting resistance. S32760 is commonly known by the tradename Zeron 100 and is widely used in offshore and chemical applications.
Chemical Composition (Ladle Analysis, % by mass):
| Element | UNS S32760 (ASTM A790) | UNS S32750 (for comparison) |
| C | ≤ 0.030 | ≤ 0.030 |
| Mn | ≤ 1.00 | ≤ 1.20 |
| P | ≤ 0.030 | ≤ 0.035 |
| S | ≤ 0.010 | ≤ 0.020 |
| Si | ≤ 1.00 | ≤ 0.80 |
| Cr | 24.0 – 26.0 | 24.0 – 26.0 |
| Ni | 6.0 – 8.0 | 6.0 – 8.0 |
| Mo | 3.0 – 4.0 | 3.0 – 5.0 |
| Cu | 0.50 – 1.00 | ≤ 0.50 |
| W | 0.50 – 1.00 | — |
| N | 0.20 – 0.30 | 0.24 – 0.32 |
| Fe | Balance | Balance |
Mechanical Properties (Room Temperature, Solution Annealed):
| Property | S32760 (Super Duplex) |
| Yield Strength (min, 0.2% offset) | 550 MPa (79,800 psi) |
| Tensile Strength (min) | 750 MPa (108,700 psi) |
| Elongation (min, 50mm gauge) | 25% |
| Hardness (max) | 90 HRB (or 290 HV) |
| Impact Toughness (min) @ -46°C | 27 J (Charpy V-Notch, typical 80-150J) |
Physical Properties:
Density: 7.80 g/cm³
Modulus of Elasticity: 200 GPa (29 × 10⁶ psi)
Thermal Conductivity: 15 W/m·K at 100°C
Coefficient of Thermal Expansion: 13.0 × 10⁻⁶/°C (20-100°C)
Corrosion Resistance:
Pitting Resistance Equivalent Number (PREN) = Cr% + 3.3(Mo%) + 16(N%) + 1.5(W%) ≥ 40 (typically 42-45)
Excellent resistance to pitting and crevice corrosion in chloride environments up to high temperatures (critical pitting temperature > 80°C in seawater)
Outstanding resistance to chloride stress corrosion cracking (SCC)
Excellent resistance to sulfuric and phosphoric acids (improved over S32750 due to Cu and W)
Excellent resistance to sulfide stress cracking (SSC) for sour service (NACE MR0175)
Microstructure Requirements (per ASTM A790): Ferrite content shall be 35-65% after solution annealing. Womic typically achieves 40-60% ferrite on production pipes.
Dimensional Range & Standards Compliance
| Item | Specification |
| Standard | ASTM A790 / ASME SA790 (pipe); ASTM A789 (tubing) |
| Manufacturing Processes | ERW, EFW, LSAW |
| Outside Diameter Range | ERW: 6.35 – 610mm; EFW/LSAW: 219 – 1524mm |
| Wall Thickness Range | ERW: 0.5 – 12.7mm; EFW/LSAW: 4.0 – 50mm |
| Schedule Range | 5S, 10S, 40S, 80S (for NPS 1/8″ – 48″) |
| Length Range | Standard: 6m; Extended: 12m, 18m, up to 24m |
| End Finish | Plain End (PE), Beveled End (BE) |
| Surface Finish | Annealed & Pickled, Bright Annealed |
| Tolerances | OD: ±0.5% or ±3.2mm; WT: ±12.5% (per ASTM A999); Length: +50mm / -0mm |
Available Dimensions & Specifications – ASTM A790 S32760 Welded Super Duplex Pipe (Selected Typical Sizes)
| NPS | OD (mm) | Schedule | WT (mm) | Weight (kg/m) | Standard Length | Typical Application |
| 1/2″ | 21.3 | 80S | 3.73 | 1.62 | 6m | Subsea control line |
| 3/4″ | 26.7 | 80S | 3.91 | 2.20 | 6m | Chemical injection |
| 1″ | 33.4 | 80S | 4.55 | 3.24 | 6m | Umbilical tube |
| 1-1/2″ | 48.3 | 80S | 5.08 | 5.41 | 6m | Hydraulic line |
| 2″ | 60.3 | 80S | 5.54 | 7.48 | 6m / 12m | Seawater lift |
| 3″ | 88.9 | 40S | 5.49 | 11.3 | 6m / 12m | Firewater main |
| 4″ | 114.3 | 40S | 6.02 | 16.1 | 6m / 12m | Sulfuric acid line |
| 6″ | 168.3 | 40S | 7.11 | 28.3 | 6m / 12m | FGD recirc line |
| 8″ | 219.1 | 40S | 8.18 | 42.6 | 12m | Offshore headers |
| 10″ | 273.0 | 40S | 9.27 | 60.3 | 12m | Phosphoric acid |
| 12″ | 323.9 | 40S | 10.31 | 79.8 | 12m | Main seawater |
| 16″ | 406.4 | 40S | 12.70 | 123.4 | 12m | Large diameter |
| 20″ | 508.0 | 40S | 15.09 | 183.5 | 12m | Marine scrubber |
| 24″ | 609.6 | 40S | 17.48 | 255.5 | 12m | High volume |
*Custom dimensions outside these ranges available. S32760 welded pipes typically require longer lead times due to specialized plate/strip sourcing.*
Common Super Duplex Stainless Steel Standards & Grades Manufactured by Womic Steel
| Standard | Steel Grades | Typical Application | Welding Process |
| ASTM A790 | S32760, S32750, S32550 | Offshore, chemical, marine | EFW/LSAW |
| ASTM A789 | S32760, S32750 | Tubing, heat exchanger | ERW (cold finished) |
| ASTM A928 | S32760, S32750 | Electric fusion welded super duplex | EFW |
| EN 10217-7 | 1.4501 (S32760), 1.4410 (S32750) | Pressure purposes | SAW/ERW |
| NORSOK M-630 | 25Cr (2507) | Offshore Norwegian sector | EFW/LSAW |
Usage: High-temperature seawater, chemical acid service, FGD absorbers, marine scrubbers, sour service with high H₂S and chlorides.
Manufacturing Process – Welded Super Duplex Stainless Steel Pipe (ERW, EFW, LSAW)
Super duplex welding requires extreme control of heat input, interpass temperature, and post-weld heat treatment. The high alloy content plus tungsten and copper additions make the material prone to intermetallic phase precipitation (sigma, chi, R-phase) if cooling is too slow or heat input excessive.
ERW (Electric Resistance Welding) Process – Small to Medium Diameter (6.35–610mm OD):
Raw Material (Strip/Coil) Inspection: Super duplex strip verified for S32760 composition (Cr 24-26%, Mo 3-4%, W 0.5-1.0%, Cu 0.5-1.0%, N 0.20-0.30%).
Uncoiling & Leveling
Strip Edge Trimming
Forming: Continuous roll forming.
High-Frequency Welding: Very low heat input (≤ 1.2 kJ/mm). Welding speed optimized.
Seam Annealing: Immediate induction annealing after weld, followed by water quench.
Sizing & Straightening
Cutting to Length
NDT: Eddy current test (100%) + optional UT.
Solution Annealing (Full Pipe): 1070-1120°C, water quench (mandatory for all super duplex).
Hydrostatic Test
Pickling & Passivation
Ferrite Measurement: 35-65% (target 40-60%).
Final Inspection & Marking
EFW (Electric Fusion Welding) Process – Large Diameter (219–1219mm OD, 4.0–50mm WT):
Plate Preparation: Super duplex plate, edges beveled (X bevel).
Roll Forming
Tack Welding
TIG (GTAW) Root Pass: Matching super duplex filler (ER2594 or ERNiCrMo-13), nitrogen backing gas (5-10% N₂ in Ar).
SAW Fill & Cap Passes: Heat input ≤ 1.5 kJ/mm, interpass temperature ≤ 100°C. Special basic flux for super duplex.
Inner Weld
100% RT + PAUT (per ASTM A928)
Solution Annealing: Full pipe heat treatment (1070-1120°C), water quench.
Pickling & Passivation
Hydrostatic Test
Ferrite Measurement & PMI
Dimensional Inspection & Marking
LSAW Process for Super Duplex – Very Large Diameter (406–1524mm OD, 6.0–50mm WT):
UOE or JCOE forming from super duplex plate
Double-sided SAW welding with heat input ≤ 1.5 kJ/mm
Full solution annealing after welding
Ferrite measurement on every pipe
Critical Control Points for S32760 Welding:
Heat input: ≤ 1.5 kJ/mm (target ≤ 1.2 kJ/mm)
Interpass temperature: ≤ 100°C (strictly enforced)
Backing gas: Minimum 5% N₂ in Ar (10% recommended)
Solution annealing: 1070-1120°C, water quench – mandatory
Ferrite content: 35-65% (target 40-60%)
Quality Control & Testing Procedures for ASTM A790 S32760 Welded Super Duplex Pipe
| Stage | Inspection Method | Purpose |
| Raw Material | Chemical Analysis (OES) | Verify S32760 (Cr 24-26%, Mo 3-4%, W 0.5-1.0%, Cu 0.5-1.0%, N 0.20-0.30%) |
| Raw Material | Tensile Testing | Yield ≥ 550 MPa, Tensile ≥ 750 MPa |
| Raw Material | Ferrite Measurement | Starting plate 40-60% |
| Raw Material | Charpy @ -46°C | ≥ 27 J (typical 80-150 J) |
| In-Process | Heat Input Monitoring | ≤ 1.5 kJ/mm |
| In-Process | Interpass Temperature | ≤ 100°C |
| Weld (ERW) | Eddy Current (100%) | Weld integrity |
| Weld (EFW/LSAW) | 100% PAUT (Phased Array UT) | Detect intermetallic phases and weld defects |
| Weld (EFW/LSAW) | RT (100% for Class 1) | Weld quality |
| Weld | Dye Penetrant (PT) | Surface cracks |
| After Solution Annealing | Ferrite Measurement (ASTM E562) | 35-65% (target 40-60%) |
| After Solution Annealing | Hardness Test | ≤ 90 HRB (or 290 HV) |
| After Solution Annealing | Microstructure (SEM/EDS) | No sigma, chi, or R-phase |
| Finished Pipe | Hydrostatic Test | Pressure integrity |
| Finished Pipe | Charpy @ -46°C (weld + HAZ) | ≥ 27 J (typical 60-120 J) |
| Finished Pipe | Pitting Corrosion Test (ASTM G48 Method A) | No pitting at 40°C, 24h (more severe than for 2205) |
| Finished Pipe | PMI (XRF) | Confirm grade (Cr, Mo, W, Cu) |
| Finished Pipe | Visual & Marking | Traceability |
Optional Tests:
ASTM G48 Method D (Critical Pitting Temperature) – CPT ≥ 80°C typical
ASTM G28 (Intergranular corrosion) for acid service
HIC/SSC for sour service (NACE TM0284, TM0177)
NORSOK M-650 documentation (ferrite, hardness, microstructure, corrosion)
Primary Applications – ASTM A790 S32760 Welded Super Duplex Stainless Steel Pipe
Offshore oil and gas platforms: High-temperature seawater lift pumps, firewater systems, cooling water mains, hydraulic control lines. S32760 with W+Cu offers slightly better acid resistance than S32750.
Sulfuric and phosphoric acid service: The copper addition improves resistance to reducing acids (H₂SO₄, H₃PO₄) compared to S32750. Used for acid piping in fertilizer plants and chemical processing.
Flue gas desulfurization (FGD) systems: Absorber recirculation lines and spray headers – resists highly chloridic acidic environment (pH 1-3, Cl⁻ up to 100,000 ppm).
Marine exhaust scrubbers (SOx removal): Closed-loop scrubbers with seawater wash. S32760 resists sulfuric acid condensation and chlorides.
Desalination high-pressure brine piping: Seawater reverse osmosis (SWRO) feed and reject lines operating at 70-100 bar with high chloride brines.
Oil and gas sour service: NACE MR0175 qualified for H₂S partial pressures up to 1 bar with chlorides. Used for subsea flowlines and process piping.
Geothermal energy production: Brine extraction lines (high temperature, high chloride, CO₂, trace H₂S).
Packaging & Shipping – ASTM A790 S32760 Welded Super Duplex Pipe
Packaging:
Anti-corrosion protection: VCI paper or plastic wrap.
End caps: Stainless steel or heavy-duty plastic caps (color-coded – typically green or yellow).
Bundling (Small diameters): Bundles with steel straps and interleaving paper.
Individual packaging (Large diameters): Plastic film wrap with foam rings.
Wooden crates for critical offshore and NORSOK M-650 projects.
Shipping:
Containers for ≤ 610mm, break-bulk for larger diameters.
Documentation: MTC 3.1/3.2, hydrotest report, PAUT/RT reports, ferrite measurement report, PMI report, Charpy reports (base + weld), G48 pitting report, microstructure report, dimensional report, packing list, COO. NORSOK M-650 dossier upon request.
Womic Steel Advantages & FAQ – ASTM A790 S32760 Super Duplex Welded Pipe
Why Partner with Womic Steel for S32760 Super Duplex?
Complete Size Range: ERW 1/4″ – 24″, EFW/LSAW 8″ – 60″.
Full solution annealing after welding (1070-1120°C, water quench).
In-house ferrite measurement and microstructure examination (SEM/EDS).
NORSOK M-650 qualified for offshore Norwegian sector.
DNV GL approval for super duplex pipes.
Critical pitting temperature (CPT) testing available.
Sour service certification (NACE MR0175/ISO 15156).
Lead times: 40-55 days for ERW, 55-75 days for EFW/LSAW.
Frequently Asked Questions (FAQ) – ASTM A790 S32760 Super Duplex Welded Pipe
Q: What is the difference between S32760 and S32750?
A: S32760 contains tungsten (0.5-1.0%) and copper (0.5-1.0%) in addition to chromium, molybdenum, and nitrogen. S32750 does not have specified W or Cu. Tungsten improves pitting resistance (adds to PREN) and copper improves resistance to reducing acids (sulfuric, phosphoric). S32760 is often preferred for chemical acid service. Both have similar mechanical properties and pitting resistance (PREN ≥ 40).
Q: Is S32760 equivalent to Zeron 100?
A: Yes. Zeron 100 is the tradename for S32760 super duplex stainless steel. The chemical composition and properties are identical. Womic supplies S32760 that meets the requirements of Zeron 100 specifications.
Q: What is the maximum service temperature for S32760?
A: Like S32750, S32760 is suitable for continuous service in seawater up to 80°C. For chloride-free environments, it can be used up to 280°C. Above 280°C, embrittlement due to sigma phase formation occurs. For high-temperature (> 300°C) applications, nickel-based alloys are recommended.
Q: Why is solution annealing mandatory for S32760 welded pipe?
A: Super duplex with W and Cu is even more prone to intermetallic phase precipitation (sigma, chi, R-phase) in the HAZ if cooling is slow. Solution annealing at 1070-1120°C dissolves any intermetallic phases and restores the ferrite/austenite balance. Womic performs full solution annealing on all S32760 welded pipes.
Q: Can S32760 be used for sour service (H₂S)?
A: Yes. S32760 is qualified for sour service per NACE MR0175/ISO 15156 for H₂S partial pressures up to 1.0 bar (15 psi). The copper and tungsten additions do not adversely affect sour service performance. Hardness is controlled to ≤ 28 HRC.
Q: What is the pitting resistance equivalent (PREN) of S32760?
A: PREN = Cr% + 3.3(Mo%) + 16(N%) + 1.5(W%). For S32760 with nominal composition 25% Cr, 3.7% Mo, 0.27% N, 0.7% W, PREN ≈ 25 + 12.2 + 4.3 + 1.05 = 42.5. Minimum PREN per ASTM is 40. This is comparable to S32750 but with added W contribution.
Q: Do you provide NORSOK M-650 certification?
A: Yes. Womic Steel is qualified to NORSOK M-650 for super duplex stainless steel welded pipes (both S32750 and S32760). Full documentation available.
Q: What is the typical lead time for S32760 welded pipe?
A: 40-55 days for ERW (small to medium diameters), 55-75 days for EFW/LSAW (large diameters). NORSOK M-650 documentation adds 15-20 days. Third-party inspection adds 7-14 days.
Project Reference – North Sea Offshore Platform Firewater & Cooling Water System (S32760)
Country: Norway (North Sea, Oseberg field area)
Standard & Grade: ASTM A790 S32760 (Super Duplex) – NORSOK M-650 qualified
Dimensions & Quantity:
OD 219.1mm (8″) × Schedule 40S (8.18mm WT) – 800 meters (approx. 27 tons) – EFW process
OD 323.9mm (12″) × Schedule 40S (10.31mm WT) – 500 meters (approx. 36 tons) – EFW process
OD 88.9mm (3″) × Schedule 80S (7.62mm WT) – 1,200 meters (approx. 17 tons) – ERW process
OD 60.3mm (2″) × Schedule 80S (5.54mm WT) – 2,500 meters (approx. 19 tons) – ERW process
Total: 5,000 meters, approx. 99 tons
Specifications: ASTM A790 S32760 solution annealed and pickled, beveled ends. Hydrostatic testing. 100% PAUT for EFW pipes, eddy current + UT for ERW. PMI on every pipe. Mandatory ferrite measurement (35-65%, achieved 45-55%). Charpy impact at -46°C (spec 27J, achieved 80-160J). Pitting corrosion test per ASTM G48 Method A at 40°C – no pitting. NORSOK M-650 documentation including microstructure (no sigma/chi), hardness traverses, and ferrite mapping. Third-party inspection by DNV Norway. NACE MR0175 for sour service.
Application: Replacement of seawater firewater and cooling water piping on an aging North Sea platform (Oseberg field). Seawater temperature: 10-15°C, but occasional stagnant conditions and chlorination (for biofouling) create localized aggressive conditions. The previous 22Cr duplex (S32205) piping had been in service for 18 years but showed some pitting in dead-leg sections. Operator selected S32760 for higher pitting resistance and longer remaining service life (target 25+ years).
Technical Challenges & Solutions:
Pitting in stagnant seawater with chlorination – Dead-leg sections of firewater system experience stagnant seawater with chlorination residual, which can lower the critical pitting temperature. S32760 with CPT > 80°C provides margin. Womic performed G48 Method A at 40°C (72h) – no pitting. Also performed cyclic polarization test – no hysteresis indicating no pitting susceptibility.
NORSOK M-650 documentation – Norwegian sector requires NORSOK M-650 certification. Womic provided full documentation: ferrite measurement (weld 48-54%, HAZ 45-51%, BM 47-55%), hardness traverses (max 275 HV10), microstructure (no sigma, chi, R-phase), and corrosion test results. DNV approved.
Welding procedure for platform repair – Platform maintenance team needed qualified WPS for field welding. Womic supplied 25 weld coupons (3″, 8″ sizes) with WPS using ER2594 filler, heat input ≤ 1.3 kJ/mm, interpass ≤ 100°C, nitrogen backing gas. Coupons passed RT, PT, Charpy at -46°C (weld 85-120J), and ferrite measurement (weld 45-55%).
Lightweight design – S32760 high strength allowed thinner walls (Schedule 40S) compared to original Schedule 80S carbon steel (corrosion allowance). Reduced pipe weight by 55%, saving 120 tons of structural modification costs.
Logistics to offshore platform – Pipes shipped from Shanghai to Bergen, then to Oseberg via supply vessel. NORSOK M-650 dossier (620 pages) delivered electronically. All 99 tons arrived on schedule.
Result: Firewater and cooling water system commissioned in Q2 2024. After 12 months of operation, inspection using ROV and internal coupon monitoring showed no pitting or crevice corrosion. The operator has upgraded their material standard for all North Sea seawater systems to S32760 for new installations and critical replacements. Womic Steel is now on the operator's approved supplier list for super duplex piping under NORSOK M-650.
Contact:
Website: www.womicsteel.com
E-mail: sales@womicsteel.com
Tel / WhatsApp / WeChat:
Victor: +86 15575100681
Jack: +86 18390957568
Womic Steel – Your reliable partner for ASTM A790 S32760 super duplex stainless steel welded pipes for offshore platforms, chemical acid service, FGD systems, marine scrubbers, and sour service applications worldwide.
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