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Quality ASTM A789 UNS S32760 Super Duplex Stainless Steel Tube For Extreme Environments factory
Quality ASTM A789 UNS S32760 Super Duplex Stainless Steel Tube For Extreme Environments factory

ASTM A789 UNS S32760 Super Duplex Stainless Steel Tube For Extreme Environments

Basic Properties
Place of Origin: MADE IN CHAINA
Brand Name: Baosteel，TISCO
Certification: EN 10204 Type 3.1 / 3.2 available
Model Number: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507
Trading Properties
Minimum Order Quantity: 100kg
Price: Negotiable (Request a Quote)
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Ability: 10000tons
Tags

Molybdenum Alloy Stainless Steel Pipe

Stainless Steel Pipe Chloride Resistance

ASTM A789 Super Duplex Stainless Steel Tube
Product Summary
ASTM A789 UNS S32760 Tube Super Duplex Stainless Steel for Extreme Environments

Product Details

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ASTM A789 Super Duplex Stainless Steel Tube

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UNS S32760 Super Duplex Stainless Steel Tube
Country Of Origin: MADE IN CHAINA
Brand: Baosteel，TISCO
Certifications: ISO/EN 10204 Type 3.1 / 3.2 Available
Grade: 201 / 202 / 301 / 302 / 303 / 304 / 304L / 305 / 309S / 310S / 316 / 316L / 317 / 317L / 321 / 347 / 409L / 410 / 420 / 430 / 440C / 2205 / 2507 / 630 (17-4PH)
MOQ: 100kg
Price: Negotiable (Request A Quote)
Packaging: Wooden Case / Wooden Pallet / Steel Frame / Carton / Woven Bag
Delivery Time: 15-25days
Payment Terms: T/T，D/P，D/A，Western Union，PayPal
Supply Capacity: 10000tons
Product Description

ASTM A789 UNS S32760 tube is a super duplex stainless steel tube specification for general corrosion-resistant and high-strength applications. UNS S32760 (also known as Zeron 100 or EN 1.4501) is a high-performance super duplex grade offering a balanced austenitic-ferritic microstructure with enhanced alloying additions of tungsten and copper.
This grade delivers approximately twice the yield strength of common austenitic grades like 316L, combined with exceptional resistance to chloride stress corrosion cracking (SCC), pitting, crevice corrosion, and erosion corrosion. The addition of tungsten and copper provides superior performance in aggressive sour service (H₂S), seawater, and acidic environments.
These tubes are widely used in offshore oil & gas, subsea systems, heat exchangers, hydraulic instrumentation lines, desalination plants, and chemical processing where the highest level of corrosion resistance and mechanical strength is required.

Key Features
FeatureDescription
StandardASTM A789 / ASME SA789
GradeUNS S32760 (EN 1.4501 / Zeron 100 equivalent)
TypeSuper Duplex Stainless Steel
ConstructionSeamless and welded
MicrostructureAustenitic + Ferritic (≈50/50 dual-phase)
Yield Strength≥550 MPa (~2× 316L, 20% higher than 2205)
PREN≥40 (excellent pitting resistance)
Corrosion ResistanceSuperior against SCC, pitting, crevice, erosion
Temperature Range-50°F to 600°F (-46°C to 316°C)
MagneticYes
Special AlloyingTungsten (W) + Copper (Cu) for enhanced performance
Equivalent Designations
StandardGrade
ASTMUNS S32760
EN1.4501 (X2CrNiMoCuWN25-7-4)
Trade NameZeron 100 (Rolls-Royce)
DINX2CrNiMoCuWN25-7-4
BS2507 with Cu + W
NORSOKMDS D48 (Super Duplex)

Note: UNS S32760 is similar to UNS S32750 (Super Duplex 2507) but with the addition of tungsten (W) and copper (Cu) for improved corrosion resistance, particularly in acidic and sour service environments.

S32760 vs. S32750 Comparison
FeatureUNS S32760UNS S32750 (2507)
Tungsten (W)0.50 – 1.00%None
Copper (Cu)0.50 – 1.00%≤0.50%
PREN≥40≥42
Yield Strength (min)≥550 MPa≥550 MPa
Sour Service (H₂S)Superior (with W+Cu)Excellent
Acidic EnvironmentsSuperior (with Cu)Good
Seawater ResistanceExcellentExcellent
Erosion ResistanceSuperiorGood
Specifications & Size Range
ParameterSeamless TubeWelded Tube
Outer Diameter (OD)6.0 mm – 219.1 mm6.0 mm – 219.1 mm
Wall Thickness (WT)0.5 mm – 15 mm0.5 mm – 8 mm
Length6.0 m random; custom lengths up to 12 m6.0 m random; custom lengths available
ToleranceOD: ±0.1 mm (precision classes available)OD: ±0.1 mm
StandardASTM A789 / ASME SA789ASTM A789 / ASME SA789
Chemical Composition (UNS S32760)
ElementContent (%)
Carbon (C)≤0.030
Chromium (Cr)24.0 – 26.0
Nickel (Ni)6.0 – 8.0
Molybdenum (Mo)3.0 – 4.0
Tungsten (W)0.50 – 1.00
Copper (Cu)0.50 – 1.00
Manganese (Mn)≤1.00
Silicon (Si)≤0.80
Nitrogen (N)0.20 – 0.30
Phosphorus (P)≤0.030
Sulfur (S)≤0.010
Iron (Fe)Balance

PREN (Pitting Resistance Equivalent Number) = %Cr + 3.3×%Mo + 16×%N ≥ 40

PREW (includes Tungsten) = %Cr + 3.3×(%Mo + 0.5×%W) + 16×%N ≥ 40

Mechanical Properties
PropertyValue
Tensile Strength (min)≥800 MPa (116 ksi)
Yield Strength (0.2% offset, min)≥550 MPa (80 ksi)
Elongation (min)25%
Hardness (max)310 HB / 32 HRC
Density7.75 – 7.80 g/cm³
Modulus of Elasticity200 GPa (29.0 × 10⁶ psi)
Impact Strength (min)60 J at -46°C
Corrosion Resistance Highlights
Corrosion TypePerformance
Pitting / CrevicePREN ≥40 → excellent resistance in high-chloride environments
Stress Corrosion Cracking (SCC)Very high resistance in chloride and H₂S environments
Sour Service (H₂S)Superior with W+Cu addition; fully NACE MR0175 / ISO 15156 compliant
General CorrosionOutstanding in organic and inorganic acids
Seawater ResistanceExcellent; proven in long-term offshore service
Erosion CorrosionEnhanced due to tungsten addition
Intergranular CorrosionLow carbon content prevents sensitization
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