Duplex Steel Fasteners: Bolts, Nuts, and Screws for Critical Applications

Choosing the right fasteners can be the difference between a project that lasts decades and one that fails prematurely under stress or corrosion. In industries like offshore drilling, marine engineering, and chemical processing, standard fasteners often can’t withstand constant exposure to chlorides, saltwater, and high mechanical loads. That’s where duplex steel fasteners come in. At Duplex Pipeline Solutions, we manufacture and supply a complete range of duplex steel fasteners engineered for strength, durability, and long-term corrosion resistance.

In this blog, we’ll cover the grades, types, and applications of our duplex steel fasteners, so you can specify the right product for your project.

Why Duplex Steel Fasteners Outperform Standard Bolts and Nuts

Duplex steel fasteners are manufactured using a dual-phase microstructure that combines the best properties of austenitic and ferritic stainless steels. Compared to conventional nuts bolts, duplex steel fasteners offer:

• Yield strength roughly twice that of standard austenitic stainless steel fasteners
• Superior resistance to pitting, crevice corrosion, and stress corrosion cracking
• Better performance in chloride-rich and high-temperature environments
• Long service life with minimal maintenance, reducing lifecycle costs

Types of Bolts and Fasteners We Supply

Our fasteners range covers a full selection of bolts and nuts, hex bolts, and screws and fasteners designed to meet diverse project requirements, including:

• Hex head bolts and studs
• Hex nuts, lock nuts, and flat washers
• Threaded rods and stud bolts
• Machine screws and self-tapping screws
• Dowel pins and custom bolting components

Common Grades of Duplex Steel Fasteners

The two most widely specified grades for duplex steel fasteners are Duplex 2205 (UNS S32205/S31803) and Super Duplex 2507 (UNS S32750). While both offer excellent corrosion resistance, 2507 provides higher strength and better performance in more aggressive environments, making it the preferred choice for offshore and subsea applications. Duplex 2205 remains a cost-effective option for a wide range of industrial uses where high strength and moderate corrosion resistance are needed.

Applications of Duplex Steel Fasteners

Our duplex steel fasteners including bolts fasteners, hex bolts, and nuts are used extensively across:

• Offshore oil and gas platforms
• Onshore piping and structural assemblies
• Marine and shipbuilding applications
• Chemical and petrochemical processing plants
• Construction projects requiring high-strength, corrosion-resistant hardware

Specifications of Our Duplex Steel Fasteners

Get a Quote for Duplex Steel Fasteners

As a trusted supplier of duplex steel fasteners in India, Duplex Pipeline Solutions delivers bolts and nuts, hex bolts, and screws and fasteners in standard and custom sizes, backed by material traceability and rigorous quality testing. Whether you need a small batch or bulk order, our team is ready to support your project with realiable stock and technical guidance.