2205 Duplex Stainless Steel Round Bar Diameter 4 - 350mm ASTM EN DIN GB Standard in 6m Length

Products Specification

2205 Duplex Stainless Steel Round Bar Diameter 4 - 350mm ASTM EN DIN GB Standard in 6m Length

Product Overview

The 2205 Duplex Stainless Steel Round Bar is a premium-grade alloy product engineered for superior strength, excellent corrosion resistance, and outstanding performance in demanding environments. Manufactured in diameters ranging from 4mm to 350mm and available in 6-meter standard lengths, this round bar conforms to leading international standards including ASTM, EN, DIN, and GB.

2205 duplex stainless steel combines the best properties of austenitic and ferritic stainless steels. It offers twice the yield strength of conventional austenitic grades such as 304 and 316, while maintaining excellent toughness and ductility. Its unique metallurgical structure—approximately 50% austenite and 50% ferrite—makes it highly resistant to stress corrosion cracking, pitting, and crevice corrosion in chloride-containing environments.

This product is widely used in industries such as chemical processing, marine engineering, oil and gas, pulp and paper, desalination, construction, and power generation.

Key Features and Advantages

• High Strength and Toughness:
  2205 duplex stainless steel offers yield strength roughly twice that of 304 or 316 stainless steel, reducing weight in structural applications without sacrificing performance.

• Superior Corrosion Resistance:
  Excellent resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking, making it ideal for seawater and chemical environments.

• Good Weldability and Fabrication:
  Can be welded using most conventional techniques including TIG, MIG, and SMAW. Post-weld heat treatment is generally not required for thin sections.

• Wide Range of Sizes:
  Available in diameters from 4mm to 350mm, catering to small precision components as well as large structural applications.

• Standard Lengths and Custom Cuts:
  Supplied in 6-meter standard bars, with custom lengths and machining options available on request.

• Global Standard Compliance:
  Manufactured according to major international standards such as:

  • ASTM A276 / A479

  • EN 10088-3

  • DIN 1.4462

  • GB/T 2205

Chemical Composition (Typical Values)

This carefully balanced chemistry provides the duplex microstructure responsible for its unique mechanical and corrosion-resistant properties.

Mechanical Properties

Compared to 316L stainless steel, 2205 duplex provides nearly double the yield strength, allowing for thinner wall sections and lighter weight structures while maintaining high mechanical integrity.

Physical Properties

These properties make 2205 duplex stainless steel stable and reliable under fluctuating thermal and mechanical conditions.

Available Sizes and Tolerances

• Diameter Range: 4mm – 350mm

• Length: Standard 6 meters (custom lengths available)

• Tolerances: According to ASTM A484 or customer specification

• Surface Finish:

  • Hot Rolled (Black)

  • Peeled / Turned

  • Polished (180–600 grit finish)

Manufacturing Process

1. Raw Material Selection: High-quality stainless steel billets sourced from certified mills.

2. Hot Rolling or Forging: Bars are formed through controlled rolling or forging to achieve optimal grain structure.

3. Heat Treatment: Solution annealed at 1040–1100°C followed by rapid cooling to ensure duplex microstructure.

4. Straightening and Cutting: Precision straightening and cutting to standard or custom lengths.

5. Surface Finishing: Shot blasting, turning, or polishing according to application requirements.

6. Inspection: 100% dimensional and visual inspection, followed by mechanical and chemical testing.

Testing and Certification

All 2205 duplex stainless steel round bars are tested according to relevant standards and customer requirements. Common inspections include:

• Chemical analysis (spectrometer test)

• Tensile and hardness testing

• Ultrasonic flaw detection

• Intergranular corrosion test (ASTM A262)

• PMI (Positive Material Identification)

• Third-party inspection by SGS, BV, or TUV upon request

Mill test certificates are provided according to EN 10204 3.1 or 3.2 standards.

Applications

1. Oil and Gas Industry

Used in subsea piping systems, manifolds, and offshore platforms where high strength and resistance to chloride corrosion are critical.

2. Chemical Processing

Ideal for reactors, heat exchangers, and pressure vessels exposed to acids and chlorides.

3. Marine and Shipbuilding

Excellent performance in seawater environments for shafts, propeller systems, and structural components.

4. Pulp and Paper Industry

Resists corrosion from bleaching chemicals and chloride-bearing solutions.

5. Desalination Plants

Used in high-pressure brine lines, evaporators, and pumps due to superior resistance to pitting and crevice corrosion.

6. Structural and Architectural Applications

Popular in bridges, building supports, and structural frameworks where a combination of strength and corrosion resistance is required.

Comparison with Other Stainless Steels

Conclusion: 2205 duplex stainless steel provides a balanced solution for projects requiring both mechanical strength and corrosion protection, outperforming 304L and 316L in aggressive environments.

Packaging and Delivery

• Packaging: Bundled with steel strips, wrapped in plastic film or waterproof paper to prevent rust.

• Marking: Each bar is tagged with grade, heat number, size, and standard for traceability.

• Delivery Condition: Solution annealed and pickled, or according to customer requirements.

• Lead Time: Typically 10–25 days depending on quantity and specifications.

• Shipping Options: Sea freight, air freight, or express delivery worldwide.

Quality Assurance

All 2205 duplex stainless steel round bars are produced under a strict ISO 9001:2015 quality management system, ensuring consistent product quality, traceability, and compliance with international standards. Each production batch is tracked from raw material through final inspection, and all mechanical and chemical data are recorded.

Why Choose Us as Your 2205 Duplex Stainless Steel Supplier

• Over 15 years of experience in stainless steel production and export

• Comprehensive stock of sizes ranging from 4mm to 350mm

• Competitive factory pricing and short delivery times

• Custom machining and cutting services available

• Full documentation: Mill Test Certificates, Packing Lists, Certificates of Origin

• Global shipping to more than 60 countries and regions

Conclusion

The 2205 Duplex Stainless Steel Round Bar (Diameter 4 – 350mm, ASTM EN DIN GB Standard, 6m Length) represents a high-performance material solution for engineers and manufacturers seeking a combination of strength, corrosion resistance, and cost efficiency. Its duplex microstructure delivers durability and reliability in even the harshest industrial conditions.

Whether used in marine applications, oil and gas systems, or structural frameworks, 2205 duplex stainless steel ensures long service life, reduced maintenance costs, and outstanding mechanical performance.

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