Stainless Steel Pipe Fittings

Super Duplex 2507 (F53 / 1.4410 / UNS S32750) By yaang.com

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Super Duplex 2507 (F53 / 1.4410 / UNS S32750) By yaang.com

Super Duplex 2507 (F53 / 1.4410 / UNS S32750) has excellent corrosion resistance to a wide variety of media, with outstanding resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with Critical Pitting Temperature exceeding 50°C.UNS S32750 (F53 / 1.4410 / Alloy 2507) exhibits a low coefficient of thermal expansion and higher heat conductivity than austenitic steels and is suitable for working temperatures up to 300°C.

Trade Name Common Name UNS ASTM A276/ A479 ASTM A182 ASTM 240 ASTM A789/A790 (ASME) European
(ASME) (ASME)
  Grade  Grade Bar Forging Plate Pipe  Werkstoff
Alloy 2507 2507 S32750 S32750 F53 S32750 S32750 1.4410
Grade Chemistry (Typical Values) Mechanicals
Specification Cr Ni Mo Cu N W Si Mn P
max
S
max
C
max
Fe UTS
N/mm²
(min)
0.20%
Proof
(min)
Elong
% (min)
Hardness
HB (max)
PREN
2507 25.0 7.0 3.8 0.75 0.25 0.28 0.80 1.20 0.035 0.020 0.030 Bal 750 500-550 25 270 41

Specifications of UNS S32750

0.2% Proof Stress (N/mm2 ) [ksi] minimum 550[79.8]
Ultimate Tensile Strength (N/mm2) [ksi] minimum 800 [116]
Elongation (%) minimum 25
Hardness (HBN) 270 max
Reduction of Cross Section Area (%) 45
Charpy V-notch Impact at ambient Temp (J) [ft.lb] 80min [59min]
Charpy V-notch Impact at -46°C (J) [ft.lb] 45av, 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 UNS S32750
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










Applications of UNS S32750
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, 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:
Super Duplex UNS S32750 Flanges, Super Duplex UNS S32750 Valves, Super Duplex UNS S32750 Pipes, Super Duplex UNS S32750 Pipe Fittings
 
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:
Fertiliser Production (Wet phosphoric acid)
 
Civil Engineering:
Sewage Treatment





























UNS S32750 Features

Super Duplex UNS S32750 has excellent corrosion resistance in a wide variety of corrosive media making it ideal for use in environments exposed to the harshest chemical conditions. It has outstanding resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with Critical Pitting Temperature exceeding 50°C. Compared to austenitic and 22%Cr duplex stainless steels, UNS S32750 is of higher strength and even more suitable in situations where it will be exposed to extremely high stresses. This combined with its excellent ductility and impact strength at both ambient and sub-zero temperatures further increases its appeal as the ultimate super duplex grade.

High resistance to abrasion, erosion and cavitation erosion combined with excellent resistance to stress corrosion cracking in chloride containing environments makesUNS S32750 perfect for use in the Oil and Gas Industries where subsea equipment is subject to some of the harshest chloride containing conditions in the world.

UNS S32750 is used for oilfield equipment where sulphide stress corrosion cracking may be a risk in hydrogen sulphide (sour) environments. UNS S32750 is also ASME Approved for Pressure Vessel applications
















KEY Features of UNS S32750
  • 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
  • ASME Approval for Pressure Vessel application













Corrosion Testing
G48A Corrosion Test at 50°C (122°F)
Seawater corrosion test, demonstrates the absence of Sigma and otherdeleterious phases such as nitrides.Confirms practical pitting resistance rather than the theoretical PREN.
Common Test Results
No Pitting and weight loss <4g/m²(For 255 SD50 weight loss is <0.8g/m²)
Impact Testing 
Charpy  ‘V’ notch  
Typically carried out at both roomtemperature and -46°C (-51°F) to ensure suitability for  offshore  applications and the absence of Sigma phase which can reduce toughness.
Common Test Results 
Room Temp :250-350 J (185-260 ft.lb)
-46°C (-51°F) :40-120 J (29-89 ft.lb)
Key Reasons to Choose Super Duplex
·    High Strength
·    Excellent Corrosion Resistance
·    Suitable for sub-zero Service
·    Extended Lifecycle
·    10% Lighter then 316
·    Cost Saving over Nickel Alloys


Super Duplex 2507 (F53 / 1.4410 / UNS S32750) has excellent corrosion resistance to a wide variety of media, with outstanding resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with Critical Pitting Temperature exceeding 50°C.

UNS S32750 (F53 / 1.4410 / Alloy 32750) exhibits a low coefficient of thermal expansion and higher heat conductivity than austenitic steels and is suitable for working temperatures up to 300°C.

UNS S32750 (F53 / 1.4401) having gained ASME Approval for Pressure Vessel applications Alloy 32750 can be used in a wide variety of applications.

Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)

Article Categories:
Duplex Stainless Steel

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