Different Types of Duplex Steel Bolts

Duplex steel bolts are high-performance fasteners widely used in various industries because of their excellent corrosion resistance and strength. These bolts are made from a combination of austenitic and ferritic stainless steel, giving them superior mechanical properties to other common materials. However, with so many types and grades of duplex steel bolts available in the market, choosing the right one for your application can take time. In this blog post, we will discuss the different types of Duplex Steel Bolts and their properties to help you make an informed decision.

Types of Duplex Steel Bolts

Duplex 2205 Bolts

Duplex 2205 bolts are among the best in the market today, providing unparalleled strength and durability for various applications. Made from a combination of austenitic and ferritic stainless steel alloys, these bolts offer greater corrosion resistance than standard stainless steel bolts. Additionally, they have excellent pitting resistance and can withstand high temperatures without degrading too fast. The added benefits make them perfect for use in demanding situations like those found in oil refineries or chemical production plants where corrosive elements may be present. Not to mention that their ability to be welded makes them very versatile- truly a must-have industrial component.

Duplex 2304 Bolts

Duplex 2304 bolts are one of the most versatile and cost-effective fasteners available. Made from a chromium, nickel, molybdenum and nitrogen blend, these bolts provide superior corrosion resistance in acidic and alkaline environments. Additionally, they offer an exceptional yield strength of up to 300 ksi (kilopounds per square inch) while still being highly pliable and able to withstand extreme temperatures. With impressive fatigue strength and excellent pitting resistance capabilities, duplex 2304 bolts can handle almost any application, from marine environments to oil & gas processing plants. With so many advantages offered by this type of fastener, it’s no wonder they remain the preferred choice for many industries worldwide!

Super Duplex Bolts

Super duplex bolting materials are made with a special type of stainless steel that combines the properties of austenitic and ferritic grades into one alloy. This increases corrosion resistance, mechanical strength, and durability in environments with high temperatures or acidic conditions. The higher mechanical strength also makes them well-suited for applications requiring uniquely strong fastening solutions, such as those in subsea engineering, desalination plants, and seawater intake systems. Moreover, these Super Duplex Steel Bolts have low thermal expansion, allowing them to remain stable under extreme temperature changes. At the same time, their ability to resist chloride stress corrosion cracking ensures they can withstand even the harshest marine conditions.

Duplex 2507 Bolts

Duplex 2507 bolts are made from chromium, molybdenum, nickel, and iron. This combination is extremely corrosion-resistant, making Duplex 2507 bolts ideal for high-temperature and pressure applications in marine, chemical, and petrochemical operations. Furthermore, the high strength-to-weight ratio of these bolts makes them an excellent choice for structural bolting purposes. The superior wear resistance of Duplex 2507 also ensures long-term performance demands are met with minimal maintenance requirements – making it an economical option in various industrial settings.

Lean Duplex Bolts

Lean Duplex Bolts are a cost-effective combination of advanced stainless steels that provide strength and corrosion resistance. They bring the best of both worlds: high strength, good corrosion resistance, toughness, and considerable flexibility – all in one package. In contrast to galvanized bolts which can become vulnerable to environmental conditions like corrosive sea salt air or acidic soils, lean duplex bolts offer superior durability even in harsh environments; this makes them ideal for outdoor applications such as marine construction or coastal landscape areas. Additionally, their high-yield tensile strength provides excellent structural rigidity for fastening heavier applications compared to traditional grades of stainless steel.


In conclusion, duplex steel bolts are high-performance fasteners with exceptional mechanical properties and corrosion resistance. The different types of duplex steel bolts available in the market vary in composition and properties, making it crucial to choose the right one for your application. By understanding the properties and applications of each type of duplex steel bolt, you can make an informed decision and ensure the long-lasting performance of your equipment. Whether you need bolts for marine, oil and gas, chemical, or any other industry, duplex steel bolts can provide the strength and durability you need.

Different Types of Duplex Steel Bolts

by Amco Metals time to read: 3 min