Exploring the Advantages of Duplex Stainless Steel Bolts

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Duplex stainless steel bolts are becoming increasingly popular in various industries due to their exceptional properties. In this blog post, we’ll delve into the world of duplex stainless steel bolts, exploring their advantages, applications, and why they are a preferred choice for many engineering and construction projects.

What is Duplex Stainless Steel?

Duplex stainless steel is a type of stainless steel that is composed of a two-phase microstructure consisting of both austenitic and ferritic stainless steel. This combination of microstructures provides duplex stainless steel bolts with a unique set of properties, making them ideal for a wide range of applications.

Advantages of Duplex Stainless Steel Bolts:

Factors to Consider When Choosing Duplex Stainless Steel Bolts:

1. Grade Selection:

Different grades of duplex stainless steel (e.g., 2205, 2507) offer varying levels of corrosion resistance and mechanical properties, so it’s crucial to select the appropriate grade for your specific application. Here are some key grades to consider:

  • 2205 Duplex Stainless Steel:
    • Known for its high resistance to stress corrosion cracking (SCC), pitting, and crevice corrosion.
    • Offers excellent strength and toughness.
    • Widely used in marine, chemical, and petrochemical industries.
  • 2507 Duplex Stainless Steel:
    • A super duplex stainless steel with enhanced strength and corrosion resistance compared to 2205.
    • Ideal for highly corrosive environments, such as those found in offshore oil and gas production.
    • Provides superior resistance to chloride-induced stress corrosion cracking.
  • Corrosion Resistance:
  • Duplex stainless steel bolts offer outstanding corrosion resistance, particularly in aggressive environments such as seawater and chloride-containing solutions. This resistance is due to the high chromium (Cr) and molybdenum (Mo) content in duplex stainless steel. These bolts are less prone to stress corrosion cracking and pitting than conventional austenitic stainless steel bolts.
  • High Strength:
  • One of the most significant advantages of duplex stainless steel bolts is their high strength. They have approximately twice the yield strength of conventional austenitic stainless steels, making them suitable for applications where high mechanical strength and corrosion resistance are required.
  • Good Weldability:
  • Duplex stainless steel bolts have good weldability, allowing for ease of fabrication and installation. They can be welded using standard welding techniques with minimal risk of precipitation of harmful intermetallic phases, making them suitable for a wide range of applications.
  • Cost-Effectiveness:
  • While duplex stainless steel bolts may have a higher initial cost compared to standard stainless steel bolts, their long-term cost-effectiveness is notable. Due to their superior corrosion resistance and high strength, they offer extended service life, reducing the need for frequent maintenance and replacement.
  • Wide Range of Applications:
  • Duplex stainless steel bolts find applications in various industries, including:
    • Oil and gas
    • Chemical processing
    • Marine
    • Pulp and paper
    • Construction
    • Renewable energy

Applications of Duplex Stainless Steel Bolts:

  • Oil and Gas Industry:
  • Duplex stainless steel bolts are commonly used in offshore oil and gas platforms, subsea pipelines, and processing equipment due to their excellent corrosion resistance and high strength.
  • Chemical Processing:
  • In the chemical processing industry, duplex stainless steel bolts are preferred for their resistance to corrosion from chemicals and acids, making them suitable for valves, pumps, and heat exchangers. 
  •  Bolts made from duplex stainless steel are favoured in chemical processing plants, where they withstand corrosive chemicals, high temperatures, and mechanical stress.
  • Marine Industry:
  • The marine industry extensively uses duplex stainless steel bolts for shipbuilding, offshore structures, and desalination plants due to their superior corrosion resistance in seawater environments.
  • Pulp and Paper Industry:
  • Duplex stainless steel bolts are widely used in the pulp and paper industry because they are resistant to corrosion from sulfurous compounds and other harsh chemicals.
  • Offshore Oil and Gas: Duplex stainless steel bolts are widely used in offshore platforms, subsea equipment, and pipelines due to their resistance to chloride-induced stress corrosion cracking and pitting corrosion.
  • Construction and Infrastructure: Duplex stainless steel bolts offer structural integrity and longevity, even in corrosive urban environments, in infrastructure projects such as bridges, tunnels, and building facades.

Factors to Consider When Choosing Duplex Stainless Steel Bolts:

  1. Environmental Conditions:

    Assess the operating environment, including temperature, humidity, and exposure to corrosive agents, to determine the optimal material for your bolts. Consider the following factors:

    • Temperature:
      • Determine whether the operating temperatures fall within the suitable range for the chosen duplex stainless steel grade.
      • For extreme temperatures, ensure the selected grade can maintain its mechanical properties.
    • Humidity and Exposure:
      • Evaluate the level of exposure to corrosive agents such as saltwater, chemicals, and industrial pollutants.
      • Consider the possibility of crevice corrosion and pitting, particularly in chloride-rich environments.
    • Specific Environment:
      • Offshore and Marine Environments: Consider the presence of seawater and salt spray, which may require a higher corrosion resistance grade, such as 2507.
      • Chemical Processing: Assess the type and concentration of chemicals the bolts will be exposed to and select a grade with the appropriate resistance.
      • Structural Applications: Determine the exposure to environmental elements and choose the grade accordingly.

    3. Installation and Maintenance:

    Proper installation procedures and regular maintenance practices are essential for maximizing the performance and lifespan of duplex stainless steel bolts. Here are some considerations:

    • Installation:
      • Follow manufacturer recommendations for torque values and tightening procedures to avoid annoying and ensure proper preload.
      • Use compatible fasteners, nuts, and washers to prevent galvanic corrosion.
      • Employ skilled personnel to ensure correct installation, which is crucial for the long-term performance of duplex stainless steel bolts.
    • Maintenance:
      • Regular inspection to identify signs of corrosion, wear, or fatigue.
      • Perform routine cleaning to remove contaminants and maintain the integrity of the surface.
      • If repairs or replacements are necessary, ensure they are carried out using compatible materials and procedures to prevent galvanic corrosion and maintain the structure’s integrity.



Duplex stainless steel bolts offer a combination of high strength and excellent corrosion resistance, making them ideal for various demanding applications across different industries. Their ability to withstand aggressive environments, their cost-effectiveness, and their wide range of applications make them a preferred choice for engineers and construction professionals.

Incorporating duplex stainless steel bolts into your projects can enhance performance, longevity, and reliability, ultimately leading to cost savings and improved safety. As technology continues to advance, the demand for duplex stainless steel bolts is expected to increase, further solidifying their place as a vital component in engineering and construction.

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