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Stainless steel Super Duplex 2507 is designed to handle highly corrosive conditions and situations were high strength is required.

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Description

Super Duplex 2507 ,UNS S32750, 1.4410, F53

Alloy 1.4410 ( S32750 ) is a super duplex stainless steel supplied in the solution annealed condition. As a super duplex stainless steel, it combines the desirable aspects of both austenitic and ferritic grades. The higher chromium, molybdenum and nitrogen contents result in a Pitting Resistance Equivalent number (PREN) of >41, providing pitting and crevice corrosion resistance superior to austenitic and duplex stainless steels in almost all corrosive media, and a Critical Pitting Temperature exceeding 50°C.

Supplied in the annealed condition, it achieves yield strengths of 80ksi (550Mpa), greater than most austenitic and duplex stainless steel grades. It cannot be hardened by heat treatment but can be strengthened by cold working. It also exhibits a low coefficient of thermal expansion and higher heat conductivity than austenitic steels and is suitable for working temperatures up to 300°C. Alloy 32750 is listed in NACE MR 0175 for sour service and having gained ASME Approval for Pressure Vessel applications it can be used in a wide variety of applications.

 

Super Duplex F53 Chemical Composition

Element Content (%)
Chromium, Cr 24 – 26
Nickel, Ni 6 – 8
Molybdenum, Mo 3 – 5
Manganese, Mn 1.20 max
Silicon, Si 0.80 max
Copper, Cu 0.50 max
Nitrogen, N 0.24 – 0.32
Phosphorous, P 0.035 max
Carbon, C 0.030 max
Sulfur, S 0.020 max
Iron, Fe Balance

Duplex stainless steel 2507 MECHANICAL PROPERTIES

Yield strength Rp0.2,
MPa
Tensile strength Rm,
MPa
Elongation
[%]
Hardness
[HB]
Impact, Charpy-V, -46ºC
[J]
Pre
BAR  ≥ 550  ≥ 750  ≥ 25  ≤ 310  ≥ 45  ≥ 40
PLATE CR (COIL)  ≥ 550  750 – 1000  ≥ 25  ≤ 310  ≥ 45  ≥ 40
PLATE HR (COIL)  ≥ 550  750 – 930  ≥ 25  ≤ 310  ≥ 45  ≥ 40
PLATE (QUARTO)  ≥ 550  750 – 930  ≥ 25  ≤ 310  ≥ 45  ≥ 40
What is the difference between duplex and stainless steel?
The main differences in composition, when compared with an austenitic stainless steel is that the duplex steels have a higher chromium content, 20–28%; higher molybdenum, up to 5%; lower nickel, up to 9% and 0.05–0.50% nitrogen.