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Exploring the Advantages of Duplex Steel Round Bar

Duplex Steel Round Bar

In the marine industry, every component and material must have excellent corrosion resistance and high strength, toughness, and weldability to withstand the harsh marine environment’s constant exposure. One of the most popular materials for marine applications is duplex steel round bar. This two-phase metal alloy has gained remarkable popularity due to its outstanding properties, making it the preferred choice for various applications in the marine sector. This blog post highlights the advantages of duplex steel round bars that make them a popular choice for marine applications.

What is a duplex steel round bar?

Duplex Steel Round Bar is a type of stainless steel composed of ferritic and austenitic steel. It has superior resistance to stress corrosion cracking and higher strength than austenitic grades. Its high chromium and molybdenum content gives it good pitting and crevice corrosion resistance, particularly in chloride-containing environments.

Duplex steel also has excellent mechanical properties, including high tensile strength, yield strength, elongation, impact toughness, ductility and fatigue endurance. Furthermore, it offers excellent weldability with low heat input requirements making it ideal for applications where fabrication is required.

Advantages of Duplex Steel Round Bar

Exceptional Corrosion Resistance

Duplex steel round bars are exceptionally corrosion-resistant, making them ideal for marine applications. Unlike other metals that corrode and deteriorate under the harsh marine environment, duplex steel contains a high amount of chromium and molybdenum that forms a protective oxide layer, ensuring high resistance to corrosion and pitting. Corrosion resistance is vital for marine equipment as they must withstand prolonged exposure to corrosive and deteriorating saltwater.

High Strength and Toughness

Duplex steel round bars have higher strength and toughness than other materials like austenitic stainless steel. These properties make it ideal for constructing critical components like propeller shafts, rudder stocks, and offshore platforms. Duplex steel’s high strength and toughness come from the material’s two-phase structure, which provides the right balance of strength and corrosion resistance needed for marine applications.

Excellent Weldability

Welding is an essential process in the fabrication and repair of marine components. Duplex steel round bars have excellent weldability, making them ideal for welding costly and complex marine components. The material’s low carbon content reduces chromium depletion in the weld zone, improving corrosion resistance.


Duplex steel round bars may be more expensive than standard materials. However, considering their durability and long-lasting properties, they are a cost-effective option for marine applications. Their strength and corrosion resistance reduces maintenance costs and equipment downtime, making them a practical choice for the marine industry’s long-term benefits.


Lastly, duplex steel round bars are versatile and can be tailored to meet different marine applications’ specific requirements. They come in different sizes, lengths, and diameters, making it easy to customize and fabricate as per the application’s needs. Their versatility and flexibility make them an ideal material for several marine applications, including offshore platforms, pipelines, and subsea equipment.


Duplex steel round bars are highly valuable materials that have revolutionized the marine industry. Their exceptional corrosion resistance, high strength and toughness, weldability, cost-effectiveness, and versatility have made them popular for marine applications. Industries that rely heavily on marine equipment like naval architecture, oil rigs, and offshore drilling can benefit significantly from the remarkable properties of duplex steel round bars. Choosing the right material is crucial for marine component design, and duplex steel round bars are a perfect solution to the marine industry’s engineering demands.


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