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Langley Alloys

Super Duplex 2507 (UNS 32750)

Super Duplex Alloy UNS S32750 (F53 / 1.4410 / Alloy 32750 / Alloy 2507) 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.

Listed in NACE MR 01 75 for sour service UNS S32750 (F53 / 1.4401) and having gained ASME Approval for Pressure Vessel applications Alloy 32750 can be used in a wide variety of applications.

For European Sales of UNS S32750 (Alloy 2507)) contact our sister company Langley Alloys in the UK

Super Duplex 2507
  • Alloy 32750 to MLA-MPS-47V-BAR/FORG
  • ASTM A473 UNS S32750 Forgings
  • ASTM A182 Grade F53 UNS S32750 Forged Flanges
  • ASTM A240 UNS S32750 Sheet and Plate
  • ASTM A479 UNS S32750 Bar
  • NACE MR 01-75
  • EN 10088-3 1.4410



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

Super Duplex 2507 Sizes Available

Bar Sizes
Dia lb/ft
1/2" 0.66
5/8" 1.04
3/4" 1.49
7/8" 2.03
1" 2.66
1 1/8" 3.36
1 1/4" 4.15
1 3/8" 5.06
1 1/2" 5.98
1 5/8" 7.06
1 3/4" 8.14
1 7/8" 9.4
2" 10.63
2 1/4" 13.45
2 1/2" 16.61
2 3/4" 20.1
3" 23.92
3 1/4" 28.08
3 1/2" 32.57
4" 42.54
4 1/4" 48.02
4 1/2" 53.84
4 3/4" 59.99
5" 66.47
5 1/2" 80.43
6" 95.72
6 1/2" 112.33
7" 130.28
8" 170.18
8 1/2" 192.18
9" 215.39
10" 265.92
11" 321.77
12" 382.92
14" 521.2
Plate / Sheet Sizes
Thickness lb/ft²
0.25” 10.78
0.375” 16.17
0.50” 21.57
0.75” 32.35
1.0” 43.13
1.25” 53.91
1.5” 64.7
1.75” 75.48
2.0” 86.26
Pipe Stock Sizes
Nominal Sch. lb/ft
Bore
1/2" 80 1.08
3/4"  80 1.49
1" 
40 1.7
80 2.21
1 1/2" 10 2.12
80 3.68
2"  10 2.68
40 3.71
80 5.1
3"  10 4.4
80 10.42
4"  10 5.71
40 10.97
80 15.25
6" 40 19.29
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 alloy UNS S32750 (F53 / 1.4410 / Alloy 32750 / Alloy 32750) 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.

Listed in NACE MR 01 75 for sour service UNS S32750 (F53 / 1.4401) and having gained ASME Approval for Pressure Vessel applications Alloy 32750 can be used in a wide variety of applications.

Langley Alloys

Langley Alloys, (Langley Alloys), located in Vancouver, Washington, is a full service metals distributor specializing in duplex and super-duplex stainless steels as well as Austenitic XM-19 alloys...... Metals ideal for chemical, marine, pulp & paper, mining, phosphate fertilizer production and pollution control applications. Our sales staff has over 50 years experience in the metals industry. Let them put that expertise to work for you.

Langley Alloys carries a full line of products in super-duplex stainless steel Ferralium 255 (UNS S32550, S32520, F61), UNS S32750 (Alloy 2507, F53) & UNS S32760 (ZERON® 100, F55). Langley Alloys prides itself as a service oriented company that can meet the high demands of our customers. With our many years of experience and close relationships with vendors, we can provide finished products directly from engineering drawings.

Using advanced technology such as abrasive water jet and plasma cutting, slitting and CNC machining, Langley Alloys can save you money and time by providing cut-to-order products in many configurations. Langley Alloys is ISO 9001:2008 certified and provides full chemical and physical certification to ASTM, ASME, ANSI, AWS, NACE, NORSOK.