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 |
|
| 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 |
|
| 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 |
|
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 |
|
|
| 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: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)
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