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Introduction
ASTM A803
/ A803M covers welded ferritic stainless steel feedwater heater tubes intended
for feedwater heaters, condensers, heat exchangers, and other heat transfer
equipment operating in corrosive and elevated-temperature environments. These
ferritic stainless steel tubes provide excellent resistance to stress corrosion
cracking, oxidation, erosion, and pitting while offering good thermal
conductivity, weldability, and mechanical strength.
ASTM A803
welded ferritic stainless steel feedwater heater tubes are extensively used in
power generation plants, nuclear power stations, thermal power plants,
petrochemical industries, desalination plants, marine condensers, industrial
heat exchangers, and process equipment. Their excellent corrosion resistance
and long service life make them ideal for feedwater heating systems where
reliability and efficiency are essential.
The
specification ensures high-quality welded ferritic stainless steel tubing with
controlled chemical composition, excellent dimensional accuracy, superior
corrosion resistance, and dependable mechanical performance for demanding heat
exchanger applications.
Ladhani
Metal Corporation is a manufacturer, supplier, and exporter of ASTM A803 /
A803M Welded Ferritic Stainless Steel Feedwater Heater Tubes, supplying
premium-quality stainless steel tubes for power generation, heat exchanger,
marine, and industrial applications worldwide.
Applicable Standard
Standard
Specification: ASTM A803 / A803M
Organization:
ASTM International
Title:
Standard Specification for Welded Ferritic Stainless Steel Feedwater Heater
Tubes
This
specification covers welded ferritic stainless steel tubes intended for
feedwater heaters, condensers, and heat exchanger applications requiring
excellent corrosion resistance and reliable heat transfer performance.
Forms of Supply
ASTM A803
stainless steel tubes are supplied in the following forms:
• Welded
ferritic stainless steel tubes
• Feedwater heater tubes
• Heat exchanger tubes
• Condenser tubes
• Straight length tubes
• U-bend tubes
• Polished tubes
• Pickled and passivated tubes
• Mill finish tubes
• Custom-cut tubes
• Fabrication-ready tubes
• Custom-sized tubes
Grades Covered Under
ASTM A803 / A803M
• TP409
• TP439
• TP XM-27
• TP XM-33
• 25-4-4
• 26-3-3
• 29-4
• 29-4-2
• 18-2
• 29-4C
Supply Condition
• Welded
• Annealed
• Solution annealed
• Pickled and passivated
• Straightened
• Fabrication-ready condition
Surface Finish
• Mill
finish
• Bright annealed finish
• Pickled finish
• Passivated finish
• Polished finish
• Smooth finish
Standard Sizes
Tubes
Outside
Diameter: 12.7 mm to 76.2 mm
Wall
Thickness: 0.7 mm to 6.0 mm
Length:
Up to 18 meters
Custom
diameters, wall thicknesses, U-bends, and cut lengths are available according
to customer requirements.
Chemical Composition
of ASTM A803 / A803M
|
Grade |
TP409 |
TP439 |
TP XM-27 |
TP XM-33 |
25-4-4 |
26-3-3 |
29-4 |
29-4-2 |
18-2 |
29-4C |
|
Carbon
(C), Max % |
0.08 |
0.07 |
0.01A |
0.06 |
0.025 |
0.03 |
0.01 |
0.01 |
0.025 |
0.03 |
|
Manganese
(Mn), Max % |
1.00 |
1.00 |
0.40 |
0.75 |
1.00 |
1.00 |
0.30 |
0.30 |
1.00 |
1.00 |
|
Phosphorus
(P), Max % |
0.045 |
0.04 |
0.02 |
0.04 |
0.04 |
0.04 |
0.025 |
0.025 |
0.04 |
0.04 |
|
Sulfur
(S), Max % |
0.03 |
0.03 |
0.02 |
0.02 |
0.03 |
0.03 |
0.02 |
0.02 |
0.03 |
0.03 |
|
Silicon
(Si), Max % |
1.00 |
1.00 |
0.40 |
0.75 |
0.75 |
1.00 |
0.20 |
0.20 |
1.00 |
1.00 |
|
Nickel
(Ni), % |
0.50 Max |
0.50 Max |
0.5B Max |
0.50 Max |
3.5–4.5 |
1.0–3.5 |
0.15 Max |
2.0–2.5 |
1.00 Max |
1.00 Max |
|
Chromium
(Cr), % |
10.5–11.7 |
17.0–19.0 |
25.0–27.5 |
25.0–27.0 |
24.5–26.0 |
25.0–28.0 |
28.0–30.0 |
28.0–30.0 |
17.5–19.5 |
28.0–30.0 |
|
Molybdenum
(Mo), % |
— |
— |
0.75–1.50 |
0.75–1.50 |
3.5–4.5 |
3.0–4.0 |
3.5–4.2 |
3.5–4.2 |
1.75–2.50 |
3.6–4.2 |
|
Aluminum
(Al), % |
— |
0.15 Max |
— |
— |
— |
— |
— |
— |
— |
— |
|
Copper
(Cu), % |
— |
— |
0.20 Max |
0.20 Max |
— |
— |
0.15 Max |
0.15 Max |
— |
— |
|
Nitrogen
(N), % |
— |
0.04 Max |
0.015 Max |
0.040 Max |
0.035 |
0.040 Max |
0.020 MaxC |
0.020 MaxC |
0.035 Max |
0.045 Max |
Notes:
- A: Special carbon requirement as
specified in the ASTM standard.
- B: Nickel requirement as
specified in the ASTM standard.
- C: Special nitrogen requirement
as specified in the ASTM standard.
The
chemical composition requirements vary according to the selected ASTM A803 /
A803M grade.
Mechanical Properties
of ASTM A803 / A803M
|
Grade |
Tensile Strength, Min (ksi [MPa]) |
Yield Strength, Min (ksi [MPa]) |
Elongation in 2 in. or 50 mm, Min
(%) |
|
TP 409 |
55 [380] |
30 [205] |
20 |
|
TP 439 |
60 [415] |
30 [205] |
20 |
|
TP XM-27 |
65 [450] |
40 [275] |
20 |
|
TP XM-33 |
68 [470] |
45 [310] |
20 |
|
25-4-4 |
90 [620] |
75 [515] |
20 |
|
26-3-3 |
85 [585] |
65 [450] |
20 |
|
29-4 |
80 [550] |
60 [415] |
20 |
|
29-4-2 |
80 [550] |
60 [415] |
20 |
|
18-2 |
60 [415] |
35 [240] |
20 |
|
29-4C |
75 [515] |
60 [415] |
18 |
Note:
- For longitudinal strip tests, reduce the elongation requirement
by 0.90 percentage points
for 29-4C and 1 percentage point for all other
grades for each 1/32 in. (0.8 mm)
decrease in wall thickness below 5/16
in. (8 mm).
Mechanical
property requirements vary according to the selected grade, tube dimensions,
and supply condition.
Key Features of ASTM
A803 / A803M Tubes
•
Excellent resistance to stress corrosion cracking
• Superior resistance to pitting and crevice corrosion
• High oxidation resistance
• Excellent heat transfer efficiency
• Good weldability
• High dimensional accuracy
• Excellent resistance to erosion
• Long operational service life
• Good thermal conductivity
• Suitable for high-temperature feedwater systems
Applications of ASTM
A803 / A803M Tubes
Power Generation Industry
•
Feedwater heaters
• Surface condensers
• Steam condensers
• Heat recovery systems
Thermal & Nuclear Power Plants
•
Feedwater piping systems
• Condenser tubing
• Heat exchanger equipment
• Steam generation systems
Petrochemical Industry
• Heat
exchangers
• Process coolers
• Condensers
• Chemical processing equipment
Marine Industry
•
Seawater condensers
• Marine heat exchangers
• Cooling systems
• Offshore processing equipment
Industrial Processing
• Cooling
equipment
• Industrial condensers
• Heat recovery units
• Process heat exchangers
Desalination Plants
•
Evaporators
• Condensers
• Heat recovery equipment
• Water treatment systems
Fabrication and
Welding
ASTM A803
/ A803M ferritic stainless steel tubes offer excellent fabrication and welding
characteristics.
•
Suitable for conventional welding processes
• Good tube bending characteristics
• Excellent formability
• Easy fabrication into heat exchanger assemblies
• Good dimensional stability
• Reliable welded joint performance
Proper
welding procedures should be followed to maintain corrosion resistance and
mechanical properties.
Heat Treatment
ASTM A803
/ A803M tubes are generally supplied in the annealed or solution-annealed
condition.
•
Solution annealing improves corrosion resistance
• Annealing enhances ductility and formability
• Stress relieving minimizes fabrication stresses
• Controlled heat treatment ensures uniform mechanical properties
• Proper heat treatment improves long-term service performance
Advantages of ASTM
A803 / A803M Tubes
• Excellent
corrosion resistance
• Superior resistance to stress corrosion cracking
• High oxidation resistance
• Excellent heat transfer performance
• Long service life
• Reliable mechanical strength
• Low maintenance requirements
• Outstanding weldability
• Excellent dimensional stability
• Cost-effective solution for feedwater heater applications
Conclusion
ASTM A803
/ A803M Welded Ferritic Stainless Steel Feedwater Heater Tubes are
high-performance stainless steel tubes designed for feedwater heaters,
condensers, heat exchangers, and industrial heat transfer equipment requiring
excellent corrosion resistance, oxidation resistance, weldability, and
long-term reliability.
Ladhani Metal Corporation
supplies ASTM A803 / A803M welded ferritic stainless steel feedwater heater
tubes in various grades, sizes, wall thicknesses, surface finishes, and
customized dimensions, delivering reliable tubing solutions for heat exchanger,
power generation, and industrial engineering projects worldwide.
FOR REQUIREMENT OF THIS GRADE
OR FOR DETAIL CONTACT US AT :-
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