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{"title":"ASME SA179 Carbon Steel Seamless U Bend Tube for Shell & Tube Heat Exchanger","imgUrl":"https:\/\/img.chinax.com\/nimg\/84\/48\/ac39354c5a851b88c2585060f3f7-200x200-1\/asme_sa179_carbon_steel_seamless_u_bend_tube_for_shell_26_tube_heat_exchanger.jpg","attrs":{"Model Number":"ASTM A179\/ASME SA179 U BEND (U BENT) HEAT EXCHANGER TUBES","Material Grade":"Carbon Steel","Minimum Order Quantity":"500 KGS","Delivery Time":"Depends on order quantity"}}
{"title":"ASME SB163 UNS N04400 (Monel 400) U-Bend Seamless Tube for Heat Exchanger","imgUrl":"https:\/\/img.chinax.com\/nimg\/a4\/fb\/1b999631c4b27657b42b580556ba-200x200-1\/asme_sb163_uns_n04400_28monel_400_29_u_bend_seamless_tube_for_heat_exchanger_service.jpg","attrs":{"Payment Terms":"T\/T,L\/C","Model Number":"HEAT EXCHANGER TUBE","Minimum Order Quantity":"800KGS","Delivery Time":"Depends on order quantity"}}
{"title":"ASTM B622 C22 Seamless Nickel Alloy Steel Tube, For Marine Environments","imgUrl":"https:\/\/img.chinax.com\/nimg\/65\/e7\/c26a3cd30fe2c8e0c432eaca6065-200x200-1\/astm_b622_c22_seamless_nickel_alloy_steel_tube_2c_for_marine_environments.jpg","attrs":{"Brand Name":"YUHONG","Model Number":"ASTM B622 C22","Certification":"ISO 9001\/TUV\/PED","Place of Origin":"China"}}
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
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.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter,Trading Company,Seller
Year Established:
1990
Total Annual:
50M-75M
Employee Number:
50~850
Ecer Certification：
Verified Supplier
Yuhong Holding Group equipments production base at Jiangsu Jiangyin City, Jinjiang City and Yancheng City. Total production area around 184000 square meters, main products : Heat Exchanger, Condenser, Pressure Vessel , Fired Heater, Economizer, Columns, Reactor.
Jinjiang Factory:
Main Products: ...
Yuhong Holding Group equipments production base at Jiangsu Jiangyin City, Jinjiang City and Yancheng City. Total production area around 184000 square meters, main products : Heat Exchanger, Condenser, Pressure Vessel , Fired Heater, Economizer, Columns, Reactor.
Jinjiang Factory:
Main Products: ...
