ThePipingMart Blog Products Super Duplex S32750 Fasteners – Properties, Composition and Uses

Super Duplex S32750 Fasteners – Properties, Composition and Uses

Super Duplex S32750 Fasteners

Fasteners are an inevitable part of almost every industry, and choosing the right one is crucial for the safety of equipment and structures. Super Duplex S32750 is an alloy that has gained popularity in recent times because of its exceptional properties. In this blog post, we will discuss everything you need to know about Super Duplex S32750 Fasteners – composition, physical and mechanical properties, uses, heat treatment, and corrosion resistance. So, stay tuned!


What is Super Duplex S32750 Fasteners?

Super Duplex S32750 Fasteners are high-strength bolts, nuts, and screws which are made from high grade stainless steel alloy. This alloy is characterised by superior corrosion resistance, excellent strength and durability. These fasteners are used in applications such as petrochemical plants, marine environments, seawater desalination and harsh chemical environments. Due to their physical properties they provide a reliable sealing solution that can extend the life of these critical components exponentially.

Super Duplex S32750 fasteners Composition

Super Duplex UNS S32750 Bolts is a combination of austenitic and ferritic stainless steel. It contains 24% chromium, 7% nickel, 3.5% molybdenum, and 0.25% nitrogen. This alloy also has a small amount of tungsten, copper, and phosphorus to enhance its properties.

Grade C Mn Si P S Cr Mo Ni N Fe
S32750 0.030 max 1.20 max 0.80 max 0.035 max 0.020 max 24.00 – 26.00 3.00 – 5.00 6.00 – 8.00 0.24 – 0.32 58.095 min

Super Duplex S32750 fasteners Physical Properties

Astm A479 SDSS UNS S32750 Hex Bolts have excellent physical properties. The density of this alloy is 7.8 g/cm³, and its melting point is 1350℃. It has a high thermal conductivity of 14.1 W/m*K and an electrical conductivity of 5.5% IACS. The coefficient of thermal expansion of this alloy is 11.7 µm/m ℃.

Super Duplex S32750 fasteners Mechanical Properties

Super Duplex Steel Uns S32750 Hex Cap Screw are known for their exceptional mechanical properties. They have high tensile strength – up to 800 MPa – and yield strength – up to 550 MPa. This alloy also has excellent elongation and toughness, making it suitable for use in critical applications.

Grades Density (g/cm 3) Density (lb/in 3) Melting Point (°C) Melting Point (°F)
S32750 7.8 0.281 1350 2460

Super Duplex S32750 fasteners Equivalent

Super Duplex 2507 1.4410 S32750

Super Duplex S32750 fasteners Uses

Asme Sa 479 S32750 Heavy Hex Bolt are widely used in industries that require high strength and excellent resistance to corrosion. These include offshore oil and gas exploration, chemical processing, and petrochemical industries. Super Duplex S32750 fasteners are also used in desalination plants and marine applications.

Super Duplex S32750 fasteners Heat Treatment

Super Duplex S32750 fasteners are typically made through hot forging, followed by solution annealing. The optimal temperature for solution annealing is between 1050-1150℃. Cooling should be done quickly to prevent the formation of harmful phases such as sigma and chi.

Super Duplex S32750 fasteners Corrosion Resistance

One of the most significant advantages of Super Duplex S32750 fasteners is their excellent resistance to corrosion. This alloy has outstanding pitting and crevice corrosion resistance, making it suitable for use in harsh environments. Super Duplex S32750 fasteners also have excellent resistance to stress corrosion cracking and erosion-corrosion.


Super Duplex S32750 fasteners are widely used due to their exceptional properties. They have high strength, excellent corrosion resistance, and can withstand harsh environments. This alloy is used in various industries, including offshore oil and gas exploration and desalination plants. Understanding the composition, physical and mechanical properties, uses, heat treatment, and corrosion resistance of Super Duplex S32750 fasteners is crucial when choosing a fastener for your industrial application.

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