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S31803 Duplex

Where Strength Meets Sophistication — Stainless Steel that Redefines Durability, Precision, and Lasting Elegance for Every Application.

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S31803 Duplex

s31803-duplex-product-image

S31803 Duplex (Duplex 2205) is a high performance duplex alloy combining ferritic strength with austenitic corrosion resistance. This S31803 material offers excellent resistance to pitting, crevice, and stress corrosion cracking, along with high mechanical strength for demanding industrial and marine environments.

Key Features

This duplex grade provides nearly twice the yield strength of standard austenitic stainless steels, excellent chloride and sulfide stress corrosion cracking resistance, and improved fatigue performance. UNS S31803 also offers good weldability and reduced thermal expansion for challenging applications.

Typical Applications
  • Offshore oil & gas platforms, risers, piping and manifolds
  • Chemical process vessels, heat exchangers and pumps
  • Marine systems including seawater cooling, desalination, and ship‑building
  • Pulp & paper plants and flue‑gas desulphurization (FGD) equipment
  • Structural and load bearing applications where high strength and corrosion resistance are required
Forms of Supply

Available in bars, blocks, sheets, and plates in solution annealed condition. Cut to size, machined, and finished formats are offered across UAE, Saudi Arabia, Oman and GCC. Silver Metal Trading LLC is a trusted stainless steel supplier and stockist in UAE.

s31803-duplex-product-image

S31803 Duplex is a high performance duplex alloy that combines the strength of ferritic grades with the corrosion resistance of austenitic stainless steels. This S31803 material offers excellent resistance to pitting, crevice corrosion, and stress corrosion cracking while maintaining high mechanical strength for demanding industrial environments.

Key Features of S31803 Duplex Stainless Steel
  • Nearly twice the yield strength of standard austenitic stainless steels
  • Excellent resistance to chloride and sulfide stress corrosion cracking
  • Balanced ferrite austenite microstructure for good weldability and fatigue performance
  • Lower thermal expansion compared to common stainless steels
  • Suitable for high strength, corrosion-resistant structural and industrial applications

 

We supply S31803 stainless steel in a wide range of product forms as a trusted S31803 duplex stainless steel supplier in the UAE, serving clients across the GCC. Our stock ensures timely delivery, with cut to size and machined options for industrial, marine, and oil and gas applications.

Technical Specifications

Chemical Composition
  • Carbon (C): ≤ 0.03% – Controls carbide formation and maintains toughness.
  • Silicon (Si): ≤ 1.00% – Supports de‑oxidation and strength.
  • Manganese (Mn): ≤ 2.00% – Helps toughness and structural integrity.
  • Phosphorus (P): ≤ 0.030% – Limits brittleness.
  • Sulfur (S): ≤ 0.020% – Ensures weldability and toughness.
  • Chromium (Cr): 21.0–23.0% – Provides corrosion resistance & strength.
  • Molybdenum (Mo): 2.50–3.50% – Improves pitting & crevice corrosion resistance.
  • Nickel (Ni): 4.50–6.50% – Stabilises microstructure and improves ductility.
  • Nitrogen (N): 0.08–0.20% – Enhances strength and corrosion resistance.
  • Iron (Fe): Balance – Main matrix element.
Certifications
  • Standard Mill Test Certificate (MTC) provided covering chemical and mechanical test data.
  • Available with EN 10204 3.1 / 3.2 inspection certificates or equivalent third‑party verification on request.
  • Compliance to standards such as ASTM A182/A815 or equivalent for the grade; project‑specific or industry certifications available upon request.
  • Traceability, third‑party witness testing, NDT or project‑specific certification support available — contact sales to specify requirements.

Technical Assistance

Our expert team and in-house metallurgists are available to provide guidance on any technical queries. At Silver Metal, we combine extensive industry knowledge with rigorous quality control to ensure every product meets the highest standards.

Silver Metal supplies high-quality metals and materials for a wide range of industries, including construction, oil & gas, manufacturing, and architectural projects across the UAE and Gulf region.

Yes! We offer tailored solutions and processing options to meet your exact project requirements. Our team can guide you through customization for all our products.

Absolutely. Each product comes with detailed technical datasheets, and our in-house metallurgists are available to assist with any technical queries.

You can easily contact our team via the website to request a quote or discuss your project. We provide professional support to ensure your requirements are met accurately and efficiently.

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Custom Orders & Support

Looking for a specific grade, finish, or size? Our team provides tailored metal solutions to match your project requirements. Contact us today.

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