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Quality ASTM A789 UNS S32205 Duplex Stainless Steel Heat Exchanger Tube with High Mechanical Strength factory
Quality ASTM A789 UNS S32205 Duplex Stainless Steel Heat Exchanger Tube with High Mechanical Strength factory
Quality ASTM A789 UNS S32205 Duplex Stainless Steel Heat Exchanger Tube with High Mechanical Strength factory
Quality ASTM A789 UNS S32205 Duplex Stainless Steel Heat Exchanger Tube with High Mechanical Strength factory
Quality ASTM A789 UNS S32205 Duplex Stainless Steel Heat Exchanger Tube with High Mechanical Strength factory

ASTM A789 UNS S32205 Duplex Stainless Steel Heat Exchanger Tube with High Mechanical Strength

Place of Origin: CHINA
Brand Name: YUHONG
Certification: ASME, ABS, DNV-GL , BV, LR , KR, CCS, PED, TUV, ISO9001, AD2000
Model Number: HEAT EXCHANGER TUBE
Minimum Order Quantity: 500KGS
Price: Negotiable
Packaging Details: Wooden case/ Ply-Wooden Cases with Steel Frames
Delivery Time: Depends on order quantity
Payment Terms: T/T,L/C
Supply Ability: 500 Tons/ Month
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Specifications
Highlight Features

UNS S32205 Duplex Stainless Steel Tube

,

Corrosion Resistant Heat Exchanger Tube

,

High Mechanical Strength ASTM A789 Tube

Product Description
ASTM A789 S32205 TUBE
Yuhong Group Co., Ltd. specializes in heat transfer equipment and precision-engineered tubular components for shell-and-tube heat exchangers, pressure vessels, and air coolers. Our engineering and manufacturing capabilities are backed by ASME Code compliance and TEMA standards.
Chemical Composition - ASTM A789 UNS S32205
UNS S32205 is a 22% chromium, 3% molybdenum, 5-6% nickel nitrogen-alloyed duplex stainless steel with tighter compositional control compared to UNS S31803.
Element Composition (%) Notes
Carbon (C) ≤ 0.030
Manganese (Mn) ≤ 2.00
Silicon (Si) ≤ 1.00
Phosphorus (P) ≤ 0.030
Sulfur (S) ≤ 0.020
Chromium (Cr) 22.0 - 23.0 Primary corrosion resistance element
Nickel (Ni) 4.5 - 6.5 Austenite stabilizer
Molybdenum (Mo) 3.0 - 3.5 Pitting resistance enhancer
Nitrogen (N) 0.14 - 0.20 Strengthens austenite phase
Mechanical Properties & Manufacturing
Tensile Properties (ASTM A789 / ASME SA789)
Property Requirement
Tensile Strength, min 655 MPa (95 ksi)
Yield Strength (0.2% offset), min 450 MPa (65 ksi)
Elongation in 50 mm, min 25%
Hardness, max 293 HBW
Manufacturing Process
Tubes are manufactured by seamless or welded process with no filler metal added.
Critical manufacturing controls:
  • Heat Treatment: Solution annealed at 1020-1100°C (1870-2010°F) to restore optimal ferrite-austenite phase balance
  • Quenching: Rapid cooling to prevent precipitation of intermetallic phases
  • Pitting Resistance Equivalent (PRE): PRE > 36 (calculated as %Cr + 3.3 * %Mo + 16 * %N)
Required Tests (per ASTM A789)
Test Requirement
Flattening Test Per ASTM A450/A450M
Flaring Test Per ASTM A450/A450M
Hardness Test Brinell or Rockwell
Hydrostatic Test Each tube
Nondestructive Electric Test Optional per specification
Intergranular Corrosion Test When specified
Supporting Fabrication Capabilities
Component Material Compatibility Manufacturing Standard
U-bend tubes S32205, S31803, S32750 Cold bending on automatic U-bend machines
Tube bundles Full assembly TEMA, ASME Section VIII
Tubesheets Carbon steel, alloy, duplex clad Drilling, machining
Baffles Various TEMA Standards
Channel heads / Covers Carbon steel, alloy ASME Section VIII
Application Fields
Industry Typical Applications
Oil & Gas Offshore platform heat exchangers, process coolers, wet H₂S service
Chemical Processing Reactors, heat exchangers handling chlorine/sulfur-containing media
Petrochemical Shell-and-tube exchangers, condensers
Power Generation Cooling water systems, feedwater heaters
Seawater Systems Desalination, seawater cooling
Pulp & Paper Digester heat exchangers, recovery boilers
LNG Liquefied natural gas heat exchangers
Technical Advantages & Customization
Performance Characteristics
  • Superior chloride pitting resistance: PRE ≥36 provides excellent resistance to pitting and crevice corrosion
  • Stress corrosion cracking resistance: Dual-phase microstructure resists chloride stress corrosion cracking
  • High mechanical strength: Yield strength approximately double that of 304/316 austenitic grades
Customization Options
  • Outside diameter: 3.18 mm to 101.6 mm (and larger upon request)
  • Wall thickness: 0.5 mm to 20 mm
  • Length: Random or cut-to-length
  • End finish: Plain ends, beveled ends
  • Tube configuration: Straight, U-bend, or finned
  • Supplementary testing: Intergranular corrosion, ultrasonic examination, eddy current testing
  • Post-bend heat treatment: Available upon specification
Frequently Asked Questions
What is the difference between UNS S32205 and UNS S31803?
Both are 2205 duplex grades. S32205 has tighter compositional limits (Cr 22.0-23.0% vs. 21.0-23.0%; Mo 3.0-3.5% vs. 2.5-3.5%; N 0.14-0.20% vs. 0.08-0.20%) and is considered the preferred grade for ASTM A789 tubing due to its enhanced corrosion resistance and weldability.
Why is solution annealing critical for duplex tubing?
Solution annealing at 1020-1100°C followed by rapid cooling restores the optimal 50/50 ferrite-austenite phase balance. Improper heat treatment can precipitate sigma phase, which reduces corrosion resistance and toughness. All Yuhong-supplied welded S32205 tubes undergo full solution annealing.
TEMA heat exchanger equipment
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