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S32760, also called F55 or 1.4501, is a high-alloy super duplex stainless steel featuring strong strength and corrosion resistance. This material is primarily used in various strong corrosion environments such as chemical processing, petrochemical applications, and submarine equipment.
Chemical Composition of S32760 Super Duplex Stainless Steel
Element
Min (%)
Max (%)
Ni
6.0
8.0
Cr
24.0
26.0
Mo
3.0
4.0
Mn
-
1.0
Cu
0.5
1.0
Si
-
1.0
C
-
0.03
N
0.2
0.3
S
-
0.01
P
-
0.03
W
0.5
1.0
Fe
-
Balance
Key Features of S32760 Super Duplex Stainless Steel
S32760 duplex steel features strong resistance to chloride corrosion, high thermal conductivity, and low coefficient of thermal expansion. Higher chromium, molybdenum, and nitrogen content make it highly resistant to pitting, crevice corrosion, and other corrosion types. The excellent overall performance of S32760 duplex steel is superior to general dual phase steel such as 2205 and S31803.
S32760 duplex steel is resistant to various inorganic acids and organic acids. The copper addition provides resistance to non-oxidative acid corrosion. This material is also resistant to strong alkali corrosion, but is not suitable for long-term use above 300°C as prolonged exposure to high temperatures can reduce material toughness.
S32760 stainless steel was originally used as cast steel in the early 1980s to address insufficient corrosion resistance in second-generation duplex stainless steel 00Cr22Ni5Mo2N (2205). By the late 1980s, it became used as deformable material for pipeline systems. This super duplex was subsequently introduced as an important corrosion-resistant material for oil and gas development, seawater environments, flue gas desulfurization (FGD), desalination, and chemical applications.
S32760 stainless steel contains small amounts of tungsten and copper in addition to high chromium, molybdenum, and nitrogen. Initially added to improve casting properties, tungsten and copper were later found to enhance corrosion resistance in certain acids and improve passivation ability in seawater.
Like other super duplex stainless steels, S32760 features a two-phase microstructure with α/γ close to 1 under solid solution conditions. However, improper thermal processing, heat treatment, or welding can cause intermetallic phases and nitrides to precipitate. At around 900°C for over 100 seconds, σ, χ, Cr2N phases may precipitate, while at about 475°C for over 800 seconds, α phase precipitation occurs. Sufficient cooling rates are essential to avoid these precipitates, and this super duplex stainless steel is not suitable for heat treatment that produces σ phase.
S32760 Super Duplex Stainless Steel Applications
Neutral chloride environments
Oil refining industry
Chemical industry pipelines
Oil and gas industry
Pulp and paper industry
Fertilizer industry, urea industry, phosphate fertilizer industry
Seawater environment, energy and environmental protection industry
Light industry and food industry, food and pharmaceutical industry equipment
Company Overview ：
The company has an indoor warehouse of 5000 square meters and an open warehouse of 4000 square meters, which can fully meet the temporary turnover and phased storage of customers' steel pipe reservation.
The subordinate processing plant has 6 sets of medium frequency h... Company Overview ：
The company has an indoor warehouse of 5000 square meters and an open warehouse of 4000 square meters, which can fully meet the temporary turnover and phased storage of customers' steel pipe reservation.
The subordinate processing plant has 6 sets of medium frequency h...
