Super Duplex S32750

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What material is S32750?

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.


uns s32750 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

uns s32750 material properties

Yield strength Rp0.2,
Tensile strength Rm,
Impact, Charpy-V, -46ºC
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 UNS S32750 and S32760?
The chemical composition of S32750 and S32760 are similar; however, the latter contains slightly more copper and tungsten. The copper content (min. 0.5, max 1.0) permits excellent resistance to corrosion in many nonoxidizing and mineral acids like hydrochloric and sulfuric acid.
What is SDSS material?
Super duplex stainless steel (SDSS) is a candidate material for production tubing in oil and gas wells and subsea pipelines used to transport corrosive hydrocarbon fluids. The suitability of this material for high temperature applications is examined in this paper.