Duplex Steel Sheet

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Duplex Steel Sheet
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Overview of Duplex Steel Sheet

• Duplex plates are characterized by a
  dual-microstructure, combining both austenitic
  and ferritic properties, which enhances their
  strength and corrosion resistance.
• The chemical composition includes elements like
  chromium, nickel, molybdenum, and nitrogen,
  contributing to excellent corrosion resistance in
  harsh environments.
• Duplex plates are widely used in industries such
  as marine systems, oil and gas exploration,
  chemical processing, and paper manufacturing,
  owing to their durability and resistance to
  pitting and crevice corrosion.

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Duplex Steel Sheet Specifications

• Key Specifications

• Duplex plates are available in various
  thicknesses ranging from 5mm to 100mm and widths
  of 1500mm to 3000mm, with lengths up to 12000mm.
• Common grades of duplex plates include S2205 (UNS
  S31803), known for its excellent mechanical
  properties and corrosion resistance.
• Tensile strength for duplex plates typically
  reaches up to 95 ksi, with a minimum yield
  strength of 65 ksi.
• Hardness is generally measured at a maximum of 31
  Rockwell C, ensuring the durability of the
  material in demanding applications.
• The density of duplex plates is approximately
  7800 kg/m³, contributing to their robust
  mechanical performance.

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Types of Duplex Steel Sheet

• Duplex Stainless Steel Sheet

• Duplex Steel Coil

• Thick plates, typically 6mm or thicker, used in
  structural applications and chemical processing
  due to their high strength and corrosion
  resistance.

• Rolls of duplex steel, often used in
  manufacturing and construction, offering
  flexibility in production and installation.

• Duplex Foil

• Clad Plate

• Thin sheets, less than 0.2mm thick, used in
  packaging and insulation applications, providing
  excellent corrosion resistance.

• Duplex plates with a layer of stainless steel
  bonded to a carbon steel base, enhancing
  corrosion resistance while maintaining structural
  integrity.

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Material Grades and Properties

• Overview of Duplex Material Grades

• UNS S31803 is the most common duplex stainless
  steel grade, known for its good corrosion
  resistance and strength.
• UNS S32205 offers higher corrosion resistance and
  strength, particularly in chloride environments.
• These grades are widely used in various
  industries including oil and gas, marine, and
  chemical processing.

• Mechanical Properties

• Yield strength of UNS S31803 is approximately 65
  ksi (450 MPa).
• UNS S32205 demonstrates a higher yield strength
  of around 70 ksi (480 MPa).
• Elongation for both grades typically ranges from
  25 to 30, indicating good ductility.

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Comparison with SS 316

• Advantages of Duplex Plates

• Lower price at approximately 3.45 per kg
  compared to SS 316's 4.98 per kg.
• Higher resistance to chloride pitting and crevice
  corrosion due to superior chemical composition.
• Better overall toughness and strength, capable of
  withstanding harsh environments.

• Disadvantages of Duplex Plates

• Lower molybdenum content than SS 316, which may
  affect certain corrosion resistance properties.
• Potential for rust when exposed to temperatures
  above 600F, unlike SS 316 which has higher heat
  resistance.
• Less well-known than SS 316, which may influence
  purchasing decisions in some industries.

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Applications and Usage

• Marine Industry

• Oil and Gas Sector

• Chemical Processing

• Duplex plates are widely used in shipbuilding and
  offshore structures due to their high corrosion
  resistance and strength, essential for marine
  environments.

• In oil and gas exploration, duplex plates are
  utilized for pipelines and equipment that require
  durability against harsh conditions and corrosive
  substances.

• Chemical processing plants employ duplex plates
  for storage tanks and reactors, benefiting from
  their resistance to chloride pitting and stress
  corrosion cracking.