DIN975 Threaded Rods Duplex Stainless Steel 2507 Duplex Stainless Steel Fasteners

Super Duplex 2507 Fasteners

Super Duplex 2507 fasteners are made of a stainless steel alloy containing 25% chromium, 4% molybdenum, and 7% nickel. Duplex 2507 is known for its high strength and excellent localized corrosion resistance to chloride. This alloy is widely used for its yield strength which is twice that of annealed austenitic stainless steels, like 304 and 316 stainless.

Super Duplex Corrosion Resistance

Chloride corrosion resistance is one of the key attributes of Super Duplex 2507 fasteners due to its specialty metal makeup. The high molybdenum, chromium and nitrogen content of Super Duplex provides these fasteners excellent resistance to chloride corrosion such as pitting and crevice attack, while its ferritic structure makes it very resistant to stress corrosion cracking in warm chloride environments. Super Duplex 2507 fasteners also provide uniform corrosion protection from organic acids such as formic and acetic acid, plus inorganic acids, especially those containing chlorides. In addition, 2507 fasteners are highly resistant to carbide-related intergranular corrosion due to their low carbon content (0.020% in weight).

Key Benefits

• Very high resistance to pitting, erosion and crevice corrosion, as well as corrosion fatigue
• Excellent resistance to stress corrosion cracking (SCC) in chloride environments
• High resistance to general corrosion in acids
• Very high mechanical strength
• Good weldability: Can be readily joined to itself or other materials
• High thermal conductivity
• Low coefficient of thermal expansion, close to that of carbon steel.

Super Duplex Alloy 2507 Chemical Composition

Super Duplex Alloy 2507 Physical properties

Super Duplex 2507 Uses

• Process and service water systems, ballast water systems, and desalinization plants utilize 2507’s resistance to chloride.
• Mechanical assemblies and infrastructure relies on Super Duplex 2507 fasteners and flanges for their ability to withstand a high mechanical load in seawater.
• Super Duplex 2507 fasteners are also used in offshore platforms, as well as oil & gas exploration and production to protect from seawater.
• Power industry flue-gas desulfurization systems and geothermal exploration units also rely on 2507 fasteners.