Duplex flanges
Duplex flanges
Duplex flanges
Duplex flanges
Duplex flanges
Duplex flanges
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Product Introduction
TOKO TECH Duplex Stainless Steel Flanges Product Introduction
Product Overview
TOKO TECH duplex stainless steel flanges are precision-manufactured from premium duplex stainless steel materials (such as 2205/S31803, 2507/S32750, etc.). Featuring a dual-phase microstructure of austenite and ferrite, they achieve an outstanding balance between strength, corrosion resistance, and cost-effectiveness. They are the ideal choice for pipeline connections in demanding service conditions within industries like offshore engineering, petrochemicals, and power generation.

Key Features & Advantages

Feature
Description
High Strength & Toughness​
Yield strength is approximately twice that of 316L stainless steel, offering excellent mechanical properties to withstand higher pressure and impact loads.
Exceptional Corrosion Resistance​
Outstanding resistance to chloride stress corrosion cracking, pitting, and crevice corrosion; especially suitable for seawater and chloride-containing media.
Good Weldability​
Proper matching of welding consumables and procedures ensures the performance of welded joints, with comprehensive welding procedure qualifications.
Excellent Fatigue Performance​
Suitable for dynamic load and vibration environments, such as offshore platforms and marine systems.
Cost-Effectiveness​
Significant cost advantage compared to high-nickel alloys while offering comparable corrosion resistance grades.

Main Material Grades

Material Grade
UNS Number
PREN Value
Key Characteristics
Typical Applications
2205
S31803/S32205
≥34
Standard duplex steel, balanced strength and corrosion resistance
Seawater systems, chemical pipelines, oil & gas transportation
2507
S32750
≥40
Super duplex steel, higher strength and corrosion resistance
High-chloride environments, sour oil & gas, deep-sea applications
Zeron 100
S32760
≥40
High-molybdenum super duplex steel, excellent overall corrosion resistance
Highly corrosive chemical media, FGD systems

Product Range & Standards

Item
Specification
Pressure Ratings​
Class 150, 300, 600, 900, 1500, 2500 (ANSI/ASME B16.5)
PN6, PN10, PN16, PN25, PN40, PN63, PN100 (EN/DIN)
Connection Types​
Weld Neck, Slip-On, Threaded, Blind, Lap Joint
Facing Types​
Raised Face (RF), Flat Face (FF), Male & Female (M/F), Tongue & Groove (T/G), Ring Type Joint (RTJ)
Size Range​
DN15~DN1200 (½"~48"), custom sizes available upon request
Manufacturing Standards​
ASME B16.5, EN 1092-1, MSS SP-44, API 6A, NORSOK L-005, etc.

Manufacturing Process & Quality Control

Process Stage
Control Points
Material Selection​
Use plate/forgings with dual certification (from material mill and TOKO TECH), ensuring composition and phase balance (ferrite/austenite ≈ 50/50) meet requirements.
Forging Process​
Multi-directional die forging or open die forging with strict control of forging temperature and deformation to prevent precipitation of harmful intermetallic phases.
Heat Treatment​
Solution annealing (1020~1100°C water quench) to ensure optimal corrosion resistance and mechanical properties.
Machining​
CNC precision machining; sealing face roughness ≤ Ra 3.2μm; dimensions compliant with ASME B16.5 tolerances.
Weld Repair​
Any repairs performed per qualified WPS, with subsequent re-heat treatment and inspection of repaired areas.
Non-Destructive Testing​
Liquid Penetrant Testing (PT) and Magnetic Particle Testing (MT) for comprehensive surface defect inspection; Ultrasonic Testing (UT) for internal quality.

Application Fields

Industry
Typical Applications
Marine & Shipbuilding​
Seawater cooling system flanges, ballast water pipe connections, subsea pipeline end terminals
Oil & Gas​
Sour oil & gas (containing H₂S/CO₂) transmission pipelines, LNG cryogenic connections, offshore platform process piping
Chemical & Petrochemical​
Strong acid (sulfuric, hydrochloric) reactor connections, chloride media transmission pipelines
Power Generation​
Flue Gas Desulfurization (FGD) systems, high-pressure RO units in seawater desalination
Pulp & Paper​
Bleaching section piping, chemical recovery systems

Certificates & Test Reports

  1. Raw Material Certificate (EN 10204 3.1/3.2 compliant)
  2. Chemical Composition Report (Spectrometry Analysis)
  3. Mechanical Properties Report (Tensile, Impact, Hardness)
  4. Metallographic Examination Report (Phase Balance, Grain Size, Intermetallic Phases)
  5. Corrosion Test Report (per ASTM G48 / A923 Method C)
  6. Dimensional Inspection Report
  7. Non-Destructive Testing Report (PT/MT/UT)
  8. Material Traceability Marking (Unique identification number for each product)

Why Choose TOKO TECH Duplex Stainless Steel Flanges?

  1. Phase Balance Control Technology​ – Proprietary heat treatment process ensures optimal ferrite/austenite ratio (40~60%), preventing sigma phase embrittlement.
  2. Full Process Traceability​ – Complete quality data traceable from steelmaking to final product.
  3. Rich Application Experience​ – Successfully supplied flanges for numerous offshore platforms, LNG projects, and chemical plants.
  4. One-Stop Service​ – Provide flange, gasket, and bolt packages to ensure integrity of the connection system.
  5. International Certifications​ – Hold approvals from major classification societies and directives such as ABS, DNV, LR, and PED.
Contact Us
TOKO TECH duplex stainless steel flanges, with their exceptional corrosion resistance and high reliability, are the preferred connection solution for pipeline systems in demanding service conditions. For sizing support, technical consultation, or project quotations, please feel free to contact us.
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