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ASTM A789 UNS S32750 Super Duplex Stainless Steel Seamless Tubes

A Super Duplex Alloy Stainless Steel Designed to Feature High Strength, Resistance to Pitting, Stress Corrosion Cracking, Erosion Corrosion and Corrosion Fatigue, Crevice Corrosion, and Strong Weldability

ASTM A789 S32750 Super Duplex Seamless Tube

ASME SA789 · UNS S32750 · 25Cr super duplex (~2507)


Duplex Stainless Steel Pipes

Savoy Piping Inc. supplies ASTM A789 S32750 seamless tubes — 25% Cr super duplex for severe chloride / seawater duty with high mechanical strength.

A790 Seamless · A790 Welded · A789 Tube · A928 EFW · Duplex hub

Also see: Duplex & super duplex hub · Duplex buttweld · Duplex flanges.

What is A789 S32750?

Duplex/super duplex tube for heat transfer and process duty. typical min yield ~550 MPa (80 ksi), tensile ~800 MPa (116 ksi) — confirm A790/A789.

Typical applications

  • Heat-exchanger and cooler tubes
  • Seawater injection and firewater systems
  • Offshore umbilicals / process piping
  • Desalination and aggressive brine

Selection guidance

Use when 2205 PREN/strength is insufficient. Control heat input, ferrite balance and intermetallic precipitation risk — WPS critical.

ASTM A789 UNS S32750 super Duplex Stainless Steel Tubes

ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Specification ASTM A789, ASTM A790, ASTM A928, ASME SA789, ASME SA790, ASME SA928
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Grades UNS S32205, UNS S31803, UNS S32750, UNS S32760, SAF® 2205, SAF® 2507, FERRINOX® 225, AMINOX® 225, ZERON® 100
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Type Seamless / Welded / ERW / EFW / Cold Draw / Hot Finish / Cold Finish
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Outer Diameter Size Seamless - 1/2" NB TO 18" NB
Welded / ERW- 1" NB TO 16" NB
EFW - 8" NB TO 110" NB
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Wall Thickness Schedule 10 to Schedule 160 (3 mm to 100 mm Thickness)
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Length 01 Meter to 12.5 Meters, Single Random Length, Double Random Length And Customize Size.
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Ends Plain Ends / Beveled Ends
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Delivery Conditions As Rolled, Formed, Stress Relieved, Annealed, Hardened, Tempered, Cold Draw, Bright Annealed
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Coating Electropolish, Mechanical Polish, Satin Finish, Passivated
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Other Testing Product Analysis, Transverse Tension Test, Flattening Test, Etching Test, Radiograph HIC Examination, Stabilizing Heat Treatment, Intergranular Corrosion Test, Weld Decay Test, Magnetic Particle Detection, Grain Size Test, NACE 0175, Dual Grade, PWHT (POST WELD HEAT TREATMENT), Flare Test, Bend Test, Hardness Test, Tensile Test etc
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Dimension All Pipes Is Manufactured and Inspected / Tested to the Relevant standards including ASTM And ASME
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Value Added Services Draw / Expansion / Machining / Sand Blasting / Shot Blasting / Heat Treatment
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Packaging Loose / Bundle / Wooden Pallet / Wooden box-a / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Shipment & Transportation By Road - Truck / Train, By Sea - Break-bulk Conventional Vessel / FCL (Full Container Load) / LCL (Less Container Load) / 20 Feet Container / 40 Feet Container / 4 Feet Container / High Cube Container / Open Top Container, By Air - Freighter Civil Passenger and Cargo Planes
ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes Material Test Certificate Manufacturer Test Certificate As Per EN10204 3.1, 3.2 / Laboratory Test Certificate From NABL Approved Lab. / Under Third Party Inspection Agency Like SGS, TUV, DNV, LLOYDS, ABS ETC

Chemical Composition of ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes

Elements C Cr Cu Fe Mo Mn N Ni P S Si W
Minimum 24.0 REMAINDER 3.00 0.24 6.00 0.20 0.50
Maximum 0.030 26 0.50 5.00 1.20 0.32 8.00 0.035 0.020 0.80 1.00

Mechanical Properties of ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes

0.2% Proof Stress (N/mm2 ) [ksi] minimum 550[79.8]
Ultimate Tensile Strength (N/mm2) [ksi] minimum 800 [116]
Elongation (%) minimum 15
ardness (HBN) 310 max
Reduction of Cross Section Area (%) 4
Charpy V-notch Impact at ambient Temp (J) [ft.lb] 80min [59min]
Charpy V-notch Impact at -46°C (J) [ft.lb] 4av, 35min [33av, 25.8min]
Additional Testing
ASTM G48A Corrosion test at 40°C No pitting and weight loss <4.0g /m2
Ultrasonic Testing According to ASTM A388
Ferrite Content 35%-55%
Microstructure Microstructure certified free from grain boundary carbides, sigma, chi and laves phases

Physical Properties OF ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes

Density (Kg.m-1) 7810
Magnetic Permeability 33
Young’s Modulus (N/mm2) 199 x 103
Specific Heat, 20°C (J.Kg-1.°K-1) 475
Fracture Toughness, Kq (MPa.m) 475
Specific Electrical Resistance, 20°C (µO.m) 0.80
Thermal conductivity, 20°C (W.m-1.°K-1) 14.2
Mean coefficient of thermal expansion, 20-100°C (°K-1) 11.1 x 10-6

Alloy Comparison Super Duplex Stainless Steel

Alloy Comparisons S31803 S17400
(17-4PH)		 718
( ST)		 S31254 Alloy 32750
0.2% Proof Strength (N/mm2), minimum 40 1070 550 300 550
Corrosion Rate (mm.y-1) Seawater <0.01< /td> ~1 <0.01< /td> <0.01< /td> <0.01< /td>
Corrosion Rate (mm.y-1)
10% sulphuric acid at 80°C		 <0.4< /td> 10 >1 1.5 <0.15< /td>
Corrosion Rate (mm.y-1)
Boiling 50% nitric acid		 <0.15< /td> <0.15< /td> <0.15< /td> 0.4 <0.15< /td>
Wear Properties related to Hardness (HBN) RC25 RC38 RC20 RC20 RC28

Main Features of UNS S32750 Super Duplex Stainless Steel

  • UNS S32750 has excellent corrosion resistance in a wide variety of corrosive chemicals
  • Outstanding resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with Critical Pitting Temperature exceeding 50°C
  • High strength compared to austenitic and 22%Cr duplex stainless steels
  • Excellent ductility and impact strength at both ambient and sub-zero temperatures
  • High resistance to abrasion, erosion and cavitation erosion
  • Excellent resistance to stress corrosion cracking in chloride containing environments
  • UNS S32750 is listed in NACE MR 01 75 for sour service
  • ASME Approval for Pressure Vessel Application

Application of ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes

  • Chemical Process Industry: Due to its high corrosion resistance UNS S32750 is ideal for use in Nitric Acid Processes, Polypropylene Production, PVC Production, Dioxide, Caustic Evaporators, and Equipment.
  • Handling Organic and Fatty Acids.
  • Marine Industry and Shipbuilding: Propellers and Shafts, Rudders, Shaft Seals, Pumps, Bolts and Fasteners, Valves, Instrumentation, Oil and Chemical Tankers
  • Oil and Gas Industry: Pumps, Valves, Pipe, Vessels, Wellhead Equipment, Subsea Equipment
  • Pollution Control: Fans and pumps, Wet Scrubbers, Incinerators
  • Pulp and Paper Industry: Black liquor heater tubes, Digester Blow Valves, Rotary Feed Valves, I.D.Fans, Brownstock Washers, Precipitators, Bleaching Components
  • Food Industry: Sugar Cane Centrifuges, Corn and Vegetable processing plant
  • Agrochemicals: Fertilizer Production (Wet phosphoric acid)
  • Civil Engineering: Sewage Treatment

Frequently asked questions — ASTM A789 S32750 Seamless Tube

What is ASTM A789 S32750?

A789 covers seamless and welded duplex stainless tubes for general corrosive service. S32750: 25% Cr super duplex for severe chloride / seawater duty with high mechanical strength.

A789 vs A790?

A789 = tube; A790 = pipe. Match the noun on the purchase order.

Typical uses?

Seawater injection and firewater systems; Offshore umbilicals / process piping; Desalination and aggressive brine

Welding / bending?

Use qualified duplex procedures; control heat input. U-bends may need post-bend heat treatment when specified.

Supplying ASTM A789 UNS 32750 Duplex Stainless Steel Seamless Tubes to Countries -

We export ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes to Saudi Arabia, Iran, Iraq, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen, Syria, Israel, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Myanmar, Taiwan, Cambodia, Argentina, Bolivia, Brazil, Chile, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States of America, Canada, Mexico, Panama, Costa Rica, Puerto Rico, Trinidad And Tobago, Jamaica, Bahamas, Denmark, Russia, Norway, Germany, France, Italy, United Kingdom, Spain, Ukraine, Netherlands, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Switzerland, Slovakia, Finland, Ireland, Croatia, Slovenia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Equatorial Guinea, The Republic Of Congo, Gabon, Europe, Africa, Asia, North America, South America, Middle East, Far East.etc

Savoy Piping Inc. is a well known worldwide Exporter of ASTM A789 UNS S32750 Super Duplex Stainless Steel Tubes, Savoy Piping Inc. is committed to provide each and every customer with the highest standard of customer service. We deal in ASTM A790 UNS 32750 Super Duplex Stainless Steel Tube in India and Overseas, offering a wide range of ASTM A789 UNS S32750 Super Duplex Stainless Steel Seamless Tubes.