Durable and Corrosion-Resistant Duplex Steel 31803 Round Bars in India

 

In industries where strength, corrosion resistance, and reliability are essential, Duplex Steel 31803 Round Bars stand out as a preferred choice. These bars combine the advantages of both ferritic and austenitic stainless steels, making them ideal for demanding environments such as oil & gas, chemical processing, and marine engineering.
As a trusted Duplex Steel 31803 round bars manufacturer in India, Shashwat Stainless Inc. delivers precision-engineered bars that ensure consistent performance and meet international standards for quality and durability.

What is Duplex Steel 31803 Round Bar?

Duplex Steel 31803 Round Bars are solid, cylindrical metal bars made from an alloy containing approximately equal parts of ferritic and austenitic stainless steel phases. This unique microstructure gives them superior strength, excellent corrosion resistance, and enhanced stress corrosion cracking resistance compared to conventional stainless steels.
 The alloy’s composition — typically containing chromium (21–23%), nickel (4.5–6.5%), and molybdenum (2.5–3.5%) — provides outstanding toughness and weldability, making it suitable for use in high-pressure and corrosive applications.

Key Features / Properties

  • High Strength: Offers nearly double the yield strength of standard austenitic stainless steels.

  • Excellent Corrosion Resistance: Performs exceptionally well in chloride and acidic environments.

  • Good Weldability & Fabrication: Easily machinable and suitable for forming, bending, and welding operations.

  • Thermal Conductivity: Superior heat transfer efficiency compared to other stainless steel grades.

Sub-Products of Duplex and Super Duplex Round Bars

  1. Super Duplex Steel 2507 Round Bars: Designed for extreme corrosion resistance and high mechanical strength, perfect for offshore and marine industries.

  2. Super Duplex Steel 32760 Round Bars: Known for exceptional pitting resistance and performance under high pressure and temperature.

  3. Super Duplex Steel 32750 Round Bars: Offers a balanced combination of strength, corrosion resistance, and cost-effectiveness for heavy-duty applications.

Each of these sub-grades complements Duplex Steel 31803, giving industries a variety of options based on environmental and mechanical requirements.

Applications / Uses

Duplex Steel 31803 Round Bars are widely used in industries that require both structural integrity and resistance to harsh operating conditions:

  • Oil & Gas Industry: Ideal for pipelines, valves, and offshore platforms where exposure to saltwater and chemicals is high.

  • Chemical Processing Plants: Used in heat exchangers, reactors, and pressure vessels due to their corrosion resistance to acids and alkalis.

  • Marine & Shipbuilding: Suitable for propeller shafts, marine fasteners, and structural components exposed to seawater.

  • Pulp & Paper Industry: Used in bleaching equipment and digester tanks that operate under corrosive conditions.

  • Desalination Plants: Preferred for brine tanks and evaporators due to chloride resistance.

When sourced from a reliable Duplex Steel 31803 round bars Supplier in India, these products deliver long-term performance with minimal maintenance.

Manufacturing Process

Producing high-quality Duplex Steel 31803 Round Bars involves precision and quality control at every step:

  1. Raw Material Selection: High-grade duplex stainless steel billets are chosen based on chemical composition and mechanical properties.

  2. Melting & Casting: Materials are melted in an electric furnace and cast into billets, ensuring uniform grain structure.

  3. Hot Rolling: The billets are hot-rolled to achieve the desired round bar diameter while improving strength and density.

  4. Heat Treatment: Annealing removes internal stresses, enhances corrosion resistance, and improves mechanical properties.

  5. Surface Finishing & Testing: The bars undergo polishing, dimensional inspection, and non-destructive testing to ensure compliance with ASTM and ASME standards.

Additional Technical Information

Duplex Steel 31803 Round Bars are typically available in sizes ranging from 5mm to 500mm diameter and lengths up to 6 meters. For precise weight calculations, industries often refer to a Pipe and Tube Weight Chart (mm/inches/kg) to select the appropriate size based on application and load requirements.

Conclusion

Duplex Steel 31803 Round Bars are a perfect blend of strength, corrosion resistance, and durability, making them an indispensable material for critical industrial applications. Choosing the right supplier ensures you receive products that meet global quality standards and deliver long-term reliability.

We are also a leading Duplex Steel 31803 round bars manufacturer and Duplex Steel 31803 round bars Supplier in India, is known for delivering precision-crafted, certified products that perform exceptionally in challenging environments. For projects that demand quality, consistency, and value — Duplex Steel 31803 Round Bars remain the trusted choice.


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