Home / Products / Stainless Steel Pipe / ASTM A789 UNS S32750 Duplex Stainless Steel Tube For Offshore Subsea
Quality ASTM A789 UNS S32750 Duplex Stainless Steel Tube For Offshore Subsea factory
Quality ASTM A789 UNS S32750 Duplex Stainless Steel Tube For Offshore Subsea factory

ASTM A789 UNS S32750 Duplex Stainless Steel Tube For Offshore Subsea

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 Duplex Stainless Steel Tube
Product Summary
ASTM A789 UNS S32750 super duplex stainless steel tube is a premium-grade product designed for the most demanding industrial applications. With a higher chromium, molybdenum, and nitrogen content than standard duplex grades (e.g., 2205/S31803), UNS S32750 offers superior strength and exceptional ...

Product Details

Highlight:

ASTM A789 Duplex Stainless Steel Tube

,

UNS S32750 Duplex Stainless Steel Tube

,

Offshore 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 S32750 super duplex stainless steel tube is a premium-grade product designed for the most demanding industrial applications. With a higher chromium, molybdenum, and nitrogen content than standard duplex grades (e.g., 2205/S31803), UNS S32750 offers superior strength and exceptional corrosion resistance, particularly in aggressive chloride-containing environments.

This tube is manufactured in accordance with ASTM A789, covering both seamless and welded ferritic/austenitic stainless steel tubing for general corrosion-resistant and high-temperature service.

Available Sizes – ASTM A789 UNS S32750 Tube

Parameter Range
Outer Diameter (OD) 6.0 mm – 219 mm (1/8″ – 8″)
Wall Thickness (WT) 0.5 mm – 15 mm
Length Customized (up to 12 meters or as required)
Type Seamless / Welded (cold finished)
End Finish Plain end, beveled end, threaded, or grooved

Note: For larger diameters (> 8″), refer to ASTM A790 UNS S32750 pipe.

Key Features of ASTM A789 UNS S32750 Super Duplex Tube

Feature Description
Ultra-High Strength Minimum yield strength ≥ 550 MPa (80 ksi) – significantly stronger than 2205 and 316L
Exceptional Corrosion Resistance Outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC)
High PREN Value PREN ≥ 40 – suitable for seawater and high-chloride environments
Chloride & Sour Service Excellent performance in offshore, subsea, and H₂S-containing environments
Good Weldability Weldable with proper filler metal (e.g., 2507/P100) and qualified procedures
Wide Temperature Range Serviceable from -50°C to 300°C depending on application
Cost-Effective Alternative Lower cost than nickel-based alloys (e.g., Inconel) while offering comparable or superior performance in many environments

Chemical Composition (%, ASTM A789 UNS S32750)

Element UNS S32750 Requirements
Carbon (C) ≤ 0.030
Silicon (Si) ≤ 0.80
Manganese (Mn) ≤ 1.20
Chromium (Cr) 24.0 – 26.0
Nickel (Ni) 6.0 – 8.0
Molybdenum (Mo) 3.0 – 5.0
Nitrogen (N) 0.24 – 0.32
Copper (Cu) ≤ 0.50
Phosphorus (P) ≤ 0.035
Sulfur (S) ≤ 0.020
Iron (Fe) Balance

Mechanical Properties (Typical)

Property Value
Tensile Strength ≥ 800 MPa (116 ksi)
Yield Strength (0.2% offset) ≥ 550 MPa (80 ksi)
Elongation ≥ 15%
Hardness (HRC) ≤ 32
Density 7.8 g/cm³
Pitting Resistance Equivalent Number (PREN)

PREN = %Cr + 3.3 × %Mo + 16 × %N
UNS S32750 PREN: ≥ 40 (typically 42 – 45)

UNS S32750 vs Other Grades

Comparison: S32750 vs 2205/S31803 vs 316L
Grade Type Yield Strength (MPa) PREN Relative Cost Best For
316L Austenitic ≥ 170 24 – 26 Low Mild corrosive environments
2205 / S31803 Standard Duplex ≥ 450 30 – 38 Medium General industrial, brackish water
UNS S32750 Super Duplex ≥ 550 ≥ 40 High Seawater, offshore, chemical processing

Which one to choose?

  • 316L – Basic corrosion resistance, low cost, non-magnetic.

  • 2205 / S31803 – Good balance of strength, corrosion resistance, and cost.

  • S32750 – Maximum performance for extreme environments – offshore, subsea, high-chloride, and sour service.

Applicable Standards

Standard Description
ASTM A789 Seamless and welded ferritic/austenitic stainless steel tubing
ASME SA789 Boiler and pressure vessel code
ASTM A790 Seamless and welded pipe (larger diameters)
EN 10216-5 European standard for duplex steel tubes
EN 10217-7 Welded duplex steel tubes
NACE MR0175 / ISO 15156 Suitable for sour service (H₂S environments)
API Applicable for oil and gas industry
Key Applications for ASTM A789 UNS S32750 Super Duplex Tube
Industry Typical Applications
Oil & Gas (Offshore & Subsea) Umbilicals, control lines, hydraulic lines, subsea manifolds, and flowlines
Chemical & Petrochemical Heat exchangers, pressure vessels, reactor piping, and process tubing
Marine & Shipbuilding Seawater cooling systems, ballast water treatment, and desalination plants
Pulp & Paper Bleaching systems and digesters in aggressive environments
Water Treatment Reverse osmosis (RO) high-pressure tubing, brine handling
Flue Gas Desulfurization (FGD) Scrubber systems in power plants
Pharmaceutical & Food High-purity and corrosion-resistant applications

FAQ – ASTM A789 UNS S32750 Super Duplex Tube

Q: What is the difference between UNS S32750 and UNS S32760?
A: Both are super duplex grades. S32760 typically contains small amounts of tungsten (W) and copper (Cu), offering slightly better corrosion resistance in certain environments. S32750 is more common in ASTM A789 tubing applications.

Q: Is UNS S32750 suitable for seawater applications?
A: Yes. With PREN ≥ 40, S32750 is specifically designed for seawater and high-chloride environments, including offshore and subsea applications.

Q: Can UNS S32750 tube be welded?
A: Yes, but requires proper filler metal (e.g., 2507/P100) and qualified welding procedures. We recommend consulting our technical team for specific welding parameters.

Q: Is UNS S32750 magnetic?
A: Yes, due to its ferrite content (approximately 40-60%), S32750 is magnetic – unlike fully austenitic grades like 316L.

Q: What is the difference between ASTM A789 and ASTM A790?
A: ASTM A789 covers tubing (typically smaller diameters up to 8″), while ASTM A790 covers pipe (larger diameters). Both can be used for UNS S32750.

Q: Do you provide cutting and tube processing services?
A: Yes, we offer custom cutting, beveling, bending, and end finishing per your requirements.

Request a Quote for ASTM A789 UNS S32750 Super Duplex Tube

Please provide your required size (OD × WT), quantity, length, and delivery port. Our team will reply within 24 hours with a competitive price and technical datasheet.

Related Products
  • Quality Precision 301 304 316 430 Cold Rolled Stainless Steel Strip 2B BA No.4 Finish factory

    Precision 301 304 316 430 Cold Rolled Stainless Steel Strip 2B BA No.4 Finish
    Precision cold rolled stainless steel strip is a narrow, thin-gauge stainless steel product manufactured to significantly tighter thickness and width tolerances than standard cold-rolled sheet. Unlike standard sheet (typically 1000mm or 1219mm wide), precision strip is produced in narrow widths — usually less than 600mm — and thin gauges from 0.05mm up to 3.0mm. The key differentiator is the tolerance : the precision strip holds thickness variations to as low as ±0.005mm,
  • Quality High Precision 304 Stainless Steel Seamless Pipe Cold Rolled Corrosion Resistance factory

    High Precision 304 Stainless Steel Seamless Pipe Cold Rolled Corrosion Resistance
    304 Stainless Steel Seamless Pipe The 304 stainless steel seamless pipe is a globally recognized standard grade in the stainless steel family. With a chemical composition of 18% chromium and 8% nickel, it offers excellent corrosion resistance, high toughness, and outstanding formability. Manufactured using precision seamless cold-rolling technology, this pipe delivers a superior surface finish, tight dimensional tolerances, and consistent mechanical properties — making it the
  • Quality UNS N06022 Hastelloy C-22 Alloy Corrosion Resistant ASTM B622 factory

    UNS N06022 Hastelloy C-22 Alloy Corrosion Resistant ASTM B622
    UNS N06022 is a nickel-chromium-molybdenum alloy renowned for its exceptional resistance to both oxidizing and reducing corrosive media. With a higher chromium content than C-276, plus controlled additions of tungsten, this alloy offers superior resistance to pitting, crevice corrosion, and stress-corrosion cracking in aggressive environments. UNS N06022 provides outstanding performance in wet chlorine, hydrochloric acid, sulfuric acid, and mixed acid solutions where many
  • Quality Austenitic Corrosion Resistant Hastelloy C-22 Nickel Alloy For Harsh Chemical Processing factory

    Austenitic Corrosion Resistant Hastelloy C-22 Nickel Alloy For Harsh Chemical Processing
    Hastelloy C-22: Ultimate Corrosion-Resistant Nickel Alloy Hastelloy C-22 is a fully austenitic, advanced corrosion-resistant nickel-chromium-molybdenum-tungsten alloy. It offers outstanding resistance to both uniform corrosion in oxidizing media and localized attack (pitting, crevice corrosion) in reducing environments. Unlike standard alloys, C-22 provides exceptional resistance to stress corrosion cracking (SCC), intergranular attack, and weld heat-affected zone (HAZ)

Send An Inquiry