Super Duplex Stainless Steel Products
What is Super Duplex Stainless Steel?
Super Duplex Stainless Steel is a next-generation alloy that combines the best of both austenitic and ferritic stainless steels. This dual-phase structure delivers a unique balance of exceptional strength, enhanced corrosion resistance, and superior durability particularly in chloride-rich and high-stress environments.
Grades like UNS S32750, S32760 and 2507 provide nearly twice the yield strength of standard 300-series stainless steels. With a Pitting Resistance Equivalent Number (PREN) above 40, Super Duplex alloys offer outstanding protection against pitting, crevice corrosion and stress corrosion cracking.
The alloy’s higher levels of chromium, molybdenum, and nitrogen not only extend its service life but also reduce maintenance needs making it a cost-effective alternative to nickel-based alloys in many industrial settings. Certified to global specifications like NORSOK MDS D55, Super Duplex Stainless Steel continues to be the material of choice for projects where performance and longevity are non-negotiable.
History of Super Duplex Stainless Steel
Super Duplex Stainless Steel emerged in the late 1970s as a solution to the limitations of standard duplex and austenitic stainless steels in highly corrosive environments. Initially developed for the offshore oil and gas industry, it was engineered to offer higher strength and improved resistance to pitting and stress corrosion cracking especially in chloride-laden conditions.
Grades like UNS S32750 and S32760 were introduced during the 1980s marking a significant advancement with their higher chromium, molybdenum and nitrogen content. By the 1990s, Super Duplex became widely adopted in critical industries including desalination, chemical processing and marine engineering supported by formal standardization under ASTM, ASME and NORSOK.
Today, it remains a key material in applications where both mechanical performance and corrosion resistance are essential.
Practical Uses of Super Duplex Stainless Steel
Super Duplex Stainless Steel is widely used in industries where high strength and corrosion resistance are critical. Its performance in aggressive environments makes it ideal for:
- Offshore Oil & Gas: Subsea pipelines, pressure vessels & platform structures
- Marine & Desalination: Seawater systems, RO units & heat exchangers
- Chemical Processing: Reactors, storage tanks & corrosive fluid handling
- Water Treatment: Brine systems, structural supports & filtration units
- Power Generation: Condensers, flue gas scrubbers & cooling circuits
Its durability, cost-efficiency, and compliance with global standards make it a preferred choice for demanding applications across sectors.
Need the Right Grade? Kalpataru Piping Helps You Choose with Confidence.
At Kalpataru Piping Solutions, we don’t just supply Super Duplex Stainless Steel, we help you select the right alloy for your application. Whether it’s strength, corrosion resistance or cost-efficiency you need, our technical team ensures you get materials that perform under pressure and last longer.
- Get expert guidance.
- Source globally certified material.
- Receive on-time, anywhere.
