Chemical Composition (Weight %)

Mechanical Properties

Key Features

• Superior Corrosion Resistance: Resistant to pitting, crevice corrosion, and stress corrosion cracking in chloride-containing environments, such as seawater and industrial effluents.
• High Strength: Offers approximately twice the yield strength of austenitic stainless steels (e.g., 304, 316), enabling thinner wall designs and reducing overall system weight.
• Excellent Weldability: Can be welded using standard techniques (TIG, MIG) with minimal risk of embrittlement when proper procedures are followed.
• Good Toughness: Maintains ductility and impact resistance across a wide temperature range, including low temperatures.
• Cost-Effective: Provides better performance than standard austenitic steels at a competitive price point, making it suitable for large-scale applications.

Standards

• ASTM A789 / A789M (Seamless and Welded Ferritic/Austenitic Duplex Stainless Steel Tubing)
• ASTM A790 / A790M (Seamless and Welded Ferritic/Austenitic Duplex Stainless Steel Pipe)
• ASME SA789 / SA790
• EN 10216-5 (Welded duplex stainless steel tubes for pressure purposes)
• DIN 17458 (Duplex stainless steel pipes)
• JIS G3463 (Stainless steel pipes for general piping)

Equivalent Grades

• UNS S31803 (original grade)
• UNS S22053 (updated grade with tighter nitrogen control)
• EN 1.4462
• DIN X2CrNiMoN22-5-3
• JIS SUS 2205

Applications

• Oil and gas: Offshore pipelines, wellhead equipment, and subsea systems.
• Chemical processing: Reactors, heat exchangers, and piping for handling acids and chlorides.
• Water treatment: Desalination plants, wastewater treatment systems, and reverse osmosis equipment.
• Pulp and paper: Bleaching lines and chemical storage tanks.
• Marine engineering: Shipbuilding, ballast systems, and coastal infrastructure.
• Construction: Structural components in corrosive environments, such as bridges and coastal buildings.

Export Packaging & Transportation

• Packaging:
  • 5.8m length pipes are bundled with heavy-duty steel straps to prevent shifting.
  • Each bundle is wrapped in waterproof plastic or Hessian cloth to protect against moisture, dust, and scratches.
  • Smaller quantities or custom lengths may be packed in wooden crates with foam padding for added protection.
  • Every package includes labels with details: material grade, size, length, quantity, heat number, and certification (e.g., Mill Test Report).
• Transportation:
  • Shipped via container ships (20ft or 40ft containers) for international exports, with proper bracing to secure bundles.
  • Land transport uses flatbed trucks or railcars, with straps and blocking to ensure stability during transit.
  • Special handling is provided for oversized or heavy pipes to maintain structural integrity.