Duplex Steel
Duplex Stainless Steel offers exceptional mechanical strength, excellent corrosion resistance and reliable performance in a broad range of demanding industrial applications
Duplex Stainless Steel is a family of Stainless Steels that combine the advantageous properties of both austenitic and ferritic structures within a single alloy.
This dual-phase microstructure provides a unique balance of strength, toughness and corrosion resistance, making Duplex Steels an excellent choice where traditional grades such as 304L and 316L may not provide sufficient performance.
Duplex Stainless Steel
The Duplex structure offers roughly twice the yield strength of standard austenitic stainless steels, while maintaining good ductility and toughness. It also provides outstanding resistance to stress corrosion cracking, pitting and crevice corrosion, particularly in chloride-containing environments.
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UNS 31803 - 1.4462
UNS S31803 / 1.4462 delivers a proven combination of mechanical performance and corrosion resistance. It contains controlled levels of chromium, molybdenum and nitrogen, giving it excellent resistance to a wide range of chemical and marine environments.
This makes S31803 / 1.4462 a dependable and cost-effective choice for critical applications where durability and reliability are key.
Duplex Steel Applications
The superior strength and corrosion resistance of Duplex stainless steel sheet and plate make it suitable for use across a wide range of sectors. It is widely utilised in chemical processing, oil and gas, offshore and marine, and water treatment industries, as well as in structural, pressure vessel and heat exchanger fabrication.
Its high mechanical strength allows for thinner sections and lighter fabrications, helping to reduce material and fabrication costs without compromising on performance.
Typical applications include storage tanks, pressure vessels, piping systems, desalination plants, architectural supports, and marine components where strength and corrosion resistance are paramount.
Why Duplex Steel
Compared with 304L or 316L, Duplex stainless steel offers significantly higher strength and superior corrosion resistance, particularly in chloride-bearing environments. This allows for lighter and more durable designs with extended service life and reduced maintenance.
Compared to higher-alloyed Super Duplex grades, standard Duplex stainless steel such as UNS S31803 / 1.4462 delivers excellent all-round performance at a more accessible cost.
It is easier to fabricate and weld than Super Duplex, yet still provides the enhanced corrosion protection and mechanical strength required for many industrial and structural applications.
At Steel Dynamics UK, all of our Duplex Stainless Steel sheet and plate is sourced exclusively from Europe’s most trusted mills, ensuring compliance with the highest international standards.
Whether you’re designing for marine environments, pressure systems or high-strength structural fabrications, Duplex Stainless Steel UNS S31803 / 1.4462 from Steel Dynamics UK offers dependable performance, long-term durability and cost-effective value.
