Duplex Steel bar for High-Performance Industrial Applications

Duplex Steel bar is a very reliable and flexible material with numerous applications in various sectors where high strength, corrosion resistance and good performance under high pressure are needed. These bars are widely used in oil and gas, chemical, aerospace and marine sectors due to their excellent mechanical properties and high corrosion resistance.

High Strength Duplex Steel bar

This steel has a composition different from ferritic and austenitic stainless steel. The key components include:

• Chromium (Cr):Normally varying between 18% and 28%, chromium gives Duplex Steel a higher resistance to oxidation and corrosion. It also increases the material’s resistance to severe conditions such as use in marine and acidic solutions.
• Molybdenum (Mo):At around 2% to 5%, Molybdenum increases the material's resistance to pitting and crevice corrosion, especially in chloride environments. It also improves strength and resistance to localised corrosion.
• Nitrogen (N):Nitrogen is added to the alloy to enhance strength and toughness. At about 0.1% to 0.3%, it contributes to the material’s resistance to stress corrosion cracking and enhances weldability.

These elements make the duplex steel bar have high tensile strength, durability and no crevice resistance hence, it is preferred in harsh conditions.

Mechanical Properties of Duplex Steel Bar

The mechanical properties of a duplex steel bar make it suitable for various high-performance applications. Some of its key properties include:

• Tensile Strength:It usually has a tensile strength of between 600MPa and 850 MPa and therefore is applied in structures such as marine structures and oil and gas equipment.
• Yield Strength: This steel has a yield strength of between 450 MPa and 600 MPa, demonstrating its ability to withstand deformation under load, which is crucial, especially in the construction and aerospace industries.
• Elongation: The duplex steel usually has an elongation of 20 - 30%, which gives this material a high degree of ductility. This makes it possible to have safe fabrication procedures like bending and welding.
• Impact Toughness:The material has high resistance to cracking and high toughness, thus suitable for use under cryogenic temperatures for instance in cryogenic services or offshore structures.

Compliance with Standards

Duplex Steel bar also follow international standards hence meeting the required quality and performance standards of the various industries. These include:

• ASTM A789 and ASTM A790:These include specifications for both seamless and welded duplex stainless steel tubes to make them corrosion resistant and also to work under high pressure and temperature systems.
• EN 10088:This European standard specifies the requirements for stainless steels, including duplex grades, covering their chemical composition and mechanical properties.

Application-Specific Benefits of Duplex Steel bar

Oil & Gas Industry

The duplex steel bar give excellent resistance against corrosion, especially the chloride and hydrogen sulfide (H2S) which is ideal when used in offshore and deep sea environments.

Chemical Industry

With high resistance to chemicals such as acids and alkalis, duplex steel bar are widely used in reactors, storage tanks and piping systems.

Power Generation

In power plants, duplex steel bar are used in environments with high temperatures and pressures, especially in boiler environments.

Shipbuilding

The high resistance to seawater corrosion, toughness and ductility of the duplex steel make it suitable for ship hulls and marine structures.

Third-Party Testing and Quality Assurance

We conduct third-party testing to verify the quality and performance of duplex steel bar. These tests serve different purposes:

• PMI (Positive Material Identification): This test confirms the chemical analysis of the steel and will help determine whether the steel meets the required standard of duplex grade steel.
• Hydrostatic Testing: This test evaluates the pressure-handling capacity of the steel. It confirms the ability of the material to withstand high-pressure conditions without leaking, making it essential for pipelines, pressure vessels and tanks.
• Radiographic Testing: This test detects internal defects such as cracks and voids and ensures the integrity of welds and the microstructure of duplex steel.

Comparison:S31803 vs. S32205

Some common duplex steel grades include S31803 and S32205, but the composition is different. S31803 has 22-23% of chromium, 3% of molybdenum and 0.2-0.3% of nitrogen, which provides the highest level of corrosion resistance and strength to different sectors. S32205 contains more nitrogen compared to S31803, and this increases its strength and resistance to chloride stress corrosion cracking for application in highly corrosive atmospheres.

Logistics and Documentation

At Duplex Steel & Alloys, we ensure the products have the necessary documentation and certifications. Common documents include:

• Mill Test Certificate (MTC): This document verifies the material's chemical composition and mechanical properties, ensuring it meets the required standards.
• Certificate of Conformity: This certificate guarantees that the duplex steel bar conforms to all applicable standards and regulations.
• Shipping and Packaging Documentation: This ensures that the products are packed well and shipped by international shipping standards to avoid damage during transit.

We offer custom dimensions and can handle bulk orders to ensure your project stays on track and meets its deadline.

Why Choose Duplex Steel & Alloys as Supplier

• Certified Excellence: Our products include duplex steel bar that meet international standards such as ISO 9001, PED and ASME.
• Global Presence: Based in Mumbai, India, we service customers worldwide, providing customized solutions to specific industry needs.
• Tailored Solutions:We provide solutions that match your application needs for dimensions, surface and heat treatment.

If you're looking for high-quality duplex steel bar that deliver in challenging environments, Duplex Steel & Alloys is your trusted partner. Contact us today for a quote or to learn more about how we can support your project needs.

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