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Introduction
ASTM A688 covers welded
austenitic stainless steel feedwater heater tubes intended primarily for use in
surface condensers, feedwater heaters, heat exchangers, and similar heat
transfer equipment. These tubes are manufactured from stainless steel strip with
longitudinal welded seams and are heat treated to provide excellent corrosion
resistance, mechanical strength, and reliable performance under
high-temperature and high-pressure operating conditions.
ASTM A688 stainless steel
tubes are widely used in power generation plants, petrochemical facilities,
chemical processing industries, refineries, marine applications, and industrial
heat exchanger systems. Their excellent resistance to corrosion, oxidation,
scaling, and stress corrosion cracking makes them ideal for demanding heat
transfer applications where long service life and dependable performance are
essential.
The specification ensures
high-quality welded stainless steel tubing with controlled dimensions, superior
weld integrity, excellent heat transfer efficiency, and outstanding fabrication
characteristics.
Ladhani Metal Corporation is
a manufacturer, supplier, and exporter of ASTM A688 Stainless Steel Tubes,
supplying premium-quality welded stainless steel feedwater heater tubes for
power generation, heat exchanger, and industrial applications worldwide.
Applicable Standard
Standard Specification: ASTM
A688
Organization: ASTM
International
Title: Standard Specification
for Welded Austenitic Stainless Steel Feedwater Heater Tubes
This specification covers
welded austenitic stainless steel feedwater heater tubes intended for use in
feedwater heaters, condensers, and heat exchangers.
Forms of Supply
ASTM A688 stainless steel
tubes are supplied in the following forms:
• Welded stainless steel
tubes
• Feedwater heater tubes
• Heat exchanger tubes
• Condenser tubes
• Straight length tubes
• U-bend tubes
• Annealed tubes
• Pickled and passivated tubes
• Polished tubes
• Cut-to-length tubes
• Custom fabricated tubes
• Industrial process tubes
Grades Covered Under
ASTM A688
• TP304
• TP304L
• TP316
• TP316L
• TP321
• TP347
Supply Condition
• Solution annealed
• Annealed and pickled
• Bright annealed
• Straight lengths
• U-bend condition (when specified)
• Passivated
Surface Finish
• Mill finish
• Pickled finish
• Bright annealed finish
• Polished finish
• Passivated finish
• Smooth surface finish
Standard Sizes
Stainless
Steel Tubes
Outside Diameter: 12.7 mm to
50.8 mm
Wall Thickness: 0.7 mm to 3.5
mm
Length: Up to 30 meters or as
specified
Custom dimensions, tube
lengths, and U-bend configurations are available according to customer
requirements.
Chemical Composition
of ASTM A688
|
Element |
TP 304 |
TP 304L |
TP 304LN |
TP 316 |
TP 316L |
TP 316LN |
TP XM-29 |
TP 304N |
TP 316N |
|
Carbon,
max |
0.08 |
0.035 |
0.035 |
0.08 |
0.035 |
0.035 |
0.060 |
0.08 |
0.08 |
|
Manganese,
max |
2.00 |
2.00 |
2.00 |
2.00 |
2.00 |
2.00 |
11.50–14.50 |
2.00 |
2.00 |
|
Phosphorus,
max |
0.040 |
0.040 |
0.040 |
0.040 |
0.040 |
0.040 |
0.060 |
0.040 |
0.040 |
|
Sulfur,
max |
0.030 |
0.030 |
0.030 |
0.030 |
0.030 |
0.030 |
0.030 |
0.030 |
0.030 |
|
Silicon,
max |
0.75 |
0.75 |
0.75 |
0.75 |
0.75 |
0.75 |
1.00 |
0.75 |
0.75 |
|
Nickel |
8.00–11.00 |
8.00–13.00 |
8.00–13.00 |
10.00–14.00 |
10.00–15.00 |
10.00–15.00 |
2.25–3.75 |
8.00–11.00 |
10.00–14.00 |
|
Chromium |
18.00–20.00 |
18.00–20.00 |
18.00–20.00 |
16.00–18.00 |
16.00–18.00 |
16.00–18.00 |
17.00–19.00 |
18.00–20.00 |
16.00–18.00 |
|
Molybdenum |
— |
— |
— |
2.00–3.00 |
2.00–3.00 |
2.00–3.00 |
— |
— |
2.00–3.00 |
|
Nitrogen |
— |
— |
0.10–0.16 |
— |
— |
0.10–0.16 |
0.20–0.40 |
0.10–0.16 |
0.10–0.16 |
Mechanical Properties
of ASTM A688
|
Grade |
Yield Strength (MPa) Min |
Tensile Strength (MPa) Min |
Elongation (%) Min |
|
TP304 |
205 |
515 |
35 |
|
TP304L |
170 |
485 |
35 |
|
TP316 |
205 |
515 |
35 |
|
TP316L |
170 |
485 |
35 |
|
TP321 |
205 |
515 |
35 |
|
TP347 |
205 |
515 |
35 |
Mechanical properties may
vary depending on tube dimensions and heat treatment condition.
Key Features of ASTM
A688 Stainless Steel Tubes
• Excellent corrosion
resistance
• Superior oxidation resistance
• High-temperature performance
• Excellent weld integrity
• Outstanding heat transfer efficiency
• Good mechanical strength
• Excellent dimensional accuracy
• Superior fabrication characteristics
• Long service life
• Low maintenance requirements
Applications of ASTM
A688 Stainless Steel Tubes
Power Generation Industry
• Feedwater heaters
• Surface condensers
• Steam condensers
• Boiler auxiliary equipment
Heat Exchanger Industry
• Shell and tube heat
exchangers
• Industrial heat exchangers
• Cooling systems
• Thermal processing equipment
Petrochemical Industry
• Process heat exchangers
• Refinery equipment
• Process condensers
• Industrial processing systems
Chemical Processing Industry
• Chemical heat exchangers
• Process equipment
• Cooling units
• Corrosion-resistant systems
Marine Industry
• Marine condensers
• Seawater cooling systems
• Offshore heat exchangers
• Shipboard processing equipment
Industrial Manufacturing
• Industrial cooling systems
• Process piping equipment
• Energy recovery systems
• Thermal transfer applications
Fabrication and
Welding
ASTM A688 stainless steel
tubes provide excellent fabrication characteristics.
• Excellent weld quality
• Good bending performance
• Suitable for tube expansion operations
• Easy fabrication and installation
• Excellent dimensional stability
• Compatible with conventional welding procedures
Proper fabrication techniques
should be followed to maintain corrosion resistance and tube performance.
Heat Treatment
ASTM A688 tubes are generally
supplied in the solution annealed condition.
• Solution annealing restores
corrosion resistance
• Controlled heat treatment ensures uniform grain structure
• Stress relieving may be performed after fabrication when required
• Proper thermal processing improves service life
• Heat treatment enhances mechanical performance and corrosion resistance
Advantages of ASTM
A688 Stainless Steel Tubes
• Excellent corrosion
resistance
• Superior heat transfer performance
• Outstanding weld integrity
• High-temperature service capability
• Long operational life
• Excellent fabrication characteristics
• Low maintenance requirements
• Reliable performance in condensers and feedwater heaters
• Cost-effective lifecycle performance
• Suitable for critical heat exchanger applications
Conclusion
ASTM A688 Stainless Steel
Tubes are premium-quality welded austenitic stainless steel feedwater heater
tubes designed for high-performance heat transfer applications. Available in
TP304, TP304L, TP316, TP316L, TP321, and TP347 grades, these tubes offer excellent
corrosion resistance, mechanical strength, and durability, making them ideal
for power generation, heat exchangers, condensers, petrochemical plants, and
industrial processing systems.
Ladhani Metal Corporation
supplies ASTM A688 stainless steel tubes in various grades, sizes, wall
thicknesses, surface finishes, and customized dimensions, delivering dependable
tubing solutions for power generation, industrial processing, and heat
exchanger applications worldwide.
FOR REQUIREMENT OF THIS GRADE
OR FOR DETAIL CONTACT US AT :-
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