Duplex Round Bar Complete Guide

Leading Manufacturer & Supplier of Duplex Steel Round Bars
GNEE group is a trusted manufacturer and supplier of high-quality duplex round bars & super duplex round bars, catering to various industries worldwide. Our product range includes Duplex Steel UNS S31803, UNS S32205 Round Bars, Duplex Steel Wires, Cold Rolled Duplex Round Bars, SS Rods, Duplex SS Hot Rolled Round Bars, Forged Bars, and more. We provide these round bars in various grades and specifications to meet the diverse needs of our clients.

Our Duplex Steel products are known for their excellent strength, corrosion resistance, and superior performance in harsh environments. Manufactured using top-grade raw materials, these products are highly durable and reliable, ensuring long-term use across various applications. At GNEE group, we prioritize quality and precision, with our expert team overseeing every step of the manufacturing process.

Overview of Duplex Round Bars
Duplex Round Bars are designed for enhanced performance in environments prone to chloride stress corrosion and chloride pitting corrosion, offering higher strength compared to standard austenitic stainless steels like Type 304 or 316. A 22%Cr duplex steel round bar offers a minimum 0.2% proof strength of approximately 450N/mm², while super duplex steel bars provide a minimum of 550N/mm².

Duplex Steel Round Bars are divided into three main types: lean duplex round bars, 22%Cr duplex steel hex bars, and 25%Cr super duplex round bars. Even higher alloyed, hyper duplex grades have been developed, with their classification primarily based on the alloy's alloying level, especially in terms of the Pitting Resistance Equivalent Number (PREN). This number measures the alloy's resistance to pitting corrosion, which is crucial for ensuring long-lasting performance in aggressive environments.

The PREN value for Duplex Steel Bars is calculated using the formula:
PREN = %Cr + 3.3%Mo + 16%N

An allowance for tungsten (W) can also be made, with a factor of 1.65. A Duplex Stainless Steel Round Bar has a PREN of less than 40, while a Super Duplex Hex Bar typically falls between 40 and 45. Hyper Duplex Round Bars have a PREN value above 45, offering superior corrosion resistance. Lean grades typically have lower nickel content, which makes them a more cost-effective option.

Duplex Steel Round Bars Benefits
High strength and excellent corrosion resistance
Superior weldability and formability
Available in various grades and finishes
Customized solutions to meet specific client requirements
Good weldability for easier fabrication
Excellent resistance to stress corrosion cracking in chloride environments
Superior resistance to pitting and crevice corrosion
Duplex Round Bars Uses
Duplex Steel Round Bars offer exceptional corrosion resistance, strength, and durability, making them ideal for a wide range of industries. Here are some key applications:

Pipeline Engineering: Used extensively for high-pressure pipelines due to their strength and resistance to corrosion.
Mechanical Engineering: Used in various mechanical components requiring high strength and fatigue resistance.
Marine Industry: Perfect for marine environments, offering protection against seawater corrosion.
Wastewater Management: Ensures durability and resistance to corrosive effects of wastewater treatment processes.
Chemical Industry: Ideal for chemical processing, providing resistance to aggressive chemicals and high temperatures.
Power Industry: Duplex Steel Round Bars are used in power plants for structural applications, ensuring long-term reliability.