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quality Duplex UNS31803 Corrosion Resistant Stainless Steel Pipe for High-Strength Applications factory
quality Duplex UNS31803 Corrosion Resistant Stainless Steel Pipe for High-Strength Applications factory
quality Duplex UNS31803 Corrosion Resistant Stainless Steel Pipe for High-Strength Applications factory

Duplex UNS31803 Corrosion Resistant Stainless Steel Pipe for High-Strength Applications

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spiral welded steel pipe

lsaw steel tube

black steel pipe
Product Summary
UNS S31803 duplex stainless steel pipes offer high strength, superior stress corrosion cracking resistance, and excellent pitting resistance due to their balanced ferritic-austenitic microstructure with 22% Cr, 3% Mo, and nitrogen addition. Ideal for oil & gas, marine, and chemical applications.

Product Details

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Duplex Stainless Steel Pipe

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UNS31803 Stainless Steel Pipe

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Corrosion Resistant Stainless Steel Pipe
Product Description
Duplex A790 UNS S31803 Stainless Steel Pipes

UNS S31803 is the standard designation for the common duplex stainless steel often known as 2205. This material combines roughly equal amounts of austenitic and ferritic microstructures, providing higher strength and superior resistance to stress corrosion cracking compared to austenitic grades like 304 or 316.

Chemical Composition
Element Composition Range (wt%)
Chromium (Cr) 21.0 – 23.0 %
Nickel (Ni) 4.5 – 6.5 %
Molybdenum (Mo) 2.5 – 3.5 %
Manganese (Mn) ≤ 2.0 %
Silicon (Si) ≤ 1.0 %
Nitrogen (N) 0.08 – 0.20 %
Carbon (C) ≤ 0.03 %
Phosphorus (P) ≤ 0.03 %
Sulfur (S) ≤ 0.02 %
Iron (Fe) Balance
Key Element Functions
  • Chromium (≈22%): Provides strong general corrosion and oxidation resistance through stable passive film formation
  • Molybdenum (≈3%): Greatly improves resistance to pitting and crevice corrosion in chloride-containing environments
  • Nickel (5–6%): Stabilizes the austenitic phase for better toughness and weldability
  • Nitrogen (0.08–0.20%): Provides solution strengthening and improves localized corrosion resistance
  • Low Carbon (≤0.03%): Reduces carbide precipitation risk during welding and maintains corrosion resistance
Performance Benefits
  • Higher strength than 304/316 stainless steel, allowing thinner wall thickness for equivalent pressure ratings
  • Superior resistance to stress corrosion cracking in chloride-bearing environments
  • Ideal for demanding applications in oil & gas, marine, chemical processing, and heat exchangers
Quality Assurance

When evaluating materials for your project:

  • Verify exact composition against recognized standards (ASTM A790/A789 or EN/ISO equivalents)
  • Request mill test certificates showing actual heat analysis
  • Consider UNS S32205 for applications requiring tighter composition specifications

UNS S31803 duplex stainless steel pipes feature a balanced ferrite-austenite microstructure with optimized chromium, nickel, molybdenum, and nitrogen content, delivering exceptional mechanical strength and corrosion performance for demanding service conditions.

Mrs. amy

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