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ASTM A249/A269

ASTM A249/A269

ASTM A249/ASME SA249 is a standard specially for welded Austenitic steel boiler, superheater, heat-exchanger, and condenser tubes, covers nominal-wall-thickness welded tubes and heavily cold worked welded tubes. ASTM A269/ASME SA 269 is a standard for seamless and welded Austenitic stainless steel tubing for general corrosion-resisting and low-or high-temperature service. These steel are susceptible to embitterment if used for prolonged periods at elevated temperatures. As a welded tube factory, MW supplies above standards in welded condition. Above standards are widely used for industrial pressure tubing and piping. And MW is certified with PED 2014/68/EU and AD2000, which is specialized certification for pressure tubing and piping. Bright Annealing: Hydrogen bright annealed in line to 1900 ℉(1040℃) minimum and rapidly water quenched is processed for all grades. Surface Condition: The tubes, after final heat treatment(Bright annealing), shall be chemically descaled or pickled free of scale. When bright annealing is used, pickling or chemical descaling is not necessary.

Available Grades and Chemical Requirements

Available Grades and Chemical Requirements

Grade

Composition, %

C

Mn

P

S

Si

Ni

Cr

Mo

N

max

max

max

max

Austenitic

304

0.08

2.0 max

0.045

0.03

1.00

8.0-11.0

18.0-20.0

304L

0.03

2.0 max

0.045

0.03

1.00

8.0-13.0

18.0-20.0

316L

0.03

2.0 max

0.045

0.03

1.00

10.0-14.0

16.0-18.0

2.0-3.0

310S

0.08

2.0 max

0.045

0.03

1.00

19.0-22.0

24.0-26.0

321

0.08

2.0 max

0.045

0.03

1.00

9.0-12.0

17.0-19.0

Austenitic-Ferritic

S31803

0.03

2.0 max

0.03

0.02

1.00

4.5-6.5

21.0-23.0

2.5-3.5

0.08-0.2

2205

0.03

2.0 max

0.03

0.02

1.00

4.5-6.5

22.0-23.0

3.0-3.5

0.14-2.0

2507

0.03

1.2 max

0.035

0.02

0.80

6.0-8.0

24.0-26.0

3.0-5.0

0.24-0.32

Mechanical Properties

Mechanical Properties

Grade
UNS
Designation
Tensile Requirements
Hardness Requirements
Tensile Strength, min
Yield Strength, min
Elongation in 2 in. or (50mm), min
Rockwell, max
Vickers max
ksi
Mpa
ksi
Mpa
%
304
S30400
75
515
30
205
35
B90
200
304L
S30403
70
485
25
170
35
B90
200
316L
S31603
70
485
25
170
35
B90
200
310S
S31008
75
515
30
205
35
B90
200
321
S32100
75
515
30
205
35
B90
200
S31803
90
620
65
450
25
30
290
2205
S32205
95
655
70
485
25
30
290
2507
S32750
116
800
80
550
15
32
300

Mechanical Test

Mechanical Test

Test
ASTM
MW
Flare
Not Required
Required
Flattening
Required
Required
Flange
Required
Required
Reverse Bend
Required
Required
Reverse Flatening
Required
Required
Tesion Test
Required
Required
Hardness
Required
Required
Eddy Current
Required
Required ᵃ
Hydrostatic
Required
Not Required
Air Underwater Test
Not Required
Required ᵇ
Note:
ᵃ : Hydrostatic or Nondestructive Electric Test: MW each tube is subjected to 100% online eddy Current Test.
ᵇ : Air Underwater Pressure Test: MW all Tubing is examined by the air underwater pressure test. Inspection is made of the entire external surface of the tube after holding the pressure for not less than 10 s after the surface of the water has become calm. If any tube shows leakage during the air underwater test, MW Metal reject it.

Tolerances for ASTM A249 tubes

Tolerances for ASTM A249 tubes

Outer Diameter in. [mm] Tolerance
Thickness Tolerance
Length Tolerance
Under 1"
＜25.4mm
±0.10mm
±10%
Under 2 [50.8] +3.0mm/-0mm
1" to 1 1⁄2"
≥25.4-38.1mm
±0.15mm
2 [50.8] or over +5.0mm/-0mm
Over 1 1⁄2" to 2"
≥38.1-50.8mm
±0.20mm
For lengths greater than 24 ft [7.3m], the above over-tolerances shall be increased by 1/8 in. [3 mm] for each 10 ft [3m] or fraction thereof over 24 ft or 1/2 in. [13 mm], whichever is the lesser.
2"to 2 1⁄2"
≥50.8-63.5mm
±0.25mm
2 1⁄2 "to 3"
≥63.5-76.2mm
±0.30mm
3" to 4"
≥76.2-101.6mm
±0.38mm
Over 4"to 7 1⁄2"
≥101.6-190.5mm
+0.38/-0.64mm
Over 7 1⁄2" to 9"
≥190.5mm-228.6mm
+0.38/-1.14mm
*In accordance with Standard ASTM A1016/A1016M.

Tolerances for ASTM A269 tubes

Tolerances for ASTM A269 tubes

Outer Diameter in. [mm] Tolerance
Thickness Tolerance
Length Tolerance
Up to 1/2"
≤12.7mm
±0.13mm
±10%
+3.2mm/0mm
1/2"to 1 1/2"
≥12.7-38.1mm
±0.13mm
+3.2mm/0mm
1 1/2" to 3 1/2"
≥38.1-88.9mm
±0.25mm
+4.8mm/0mm, these tolerance apply to cut lengths up to and including 24ft(7.3m). For lengths greater than 24ft(7.3m), the above tolerance shall be increased by 1/8 in.(3mm) for each 10ft(3m) or fraction thereof over 24ft. Or 1/2 in (13mm), whichever is lesser.
3 1/2" to 5 1/2"
≥88.9-139.7mm
±0.38mm
5 1/2"to 8"
≥139.7-203.2mm
±0.76mm
8" to 12"
≥203.2-304.8mm
±1.01mm
12" to 14"
≥304.8-355.6mm
±1.26mm
*In accordance with Standard ASTM A269

Relationship Product

Typical Chemical Composition %

Typical Mechanical Properties

ASTM A554 Wall Thickness/Outside Dimention Tolerances

Wall Thickness Tolerances
± 10% of specified wall thickness

APPLICATIONS

Boiler
Boiler
ASTM A249/A269 standard stainless steel welded pipes are specifically designed for boiler, superheater, heat exchanger, and condenser applications. These standards dictate strict criteria for the chemical composition, mechanical properties, heat treatment, and testing methods to ensure the pipes can withstand high pressure and temperatures. The high corrosion resistance and durability of these pipes make them an optimal choice for the demanding conditions of boiler systems, contributing to their efficiency and longevity.
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Superheater
Superheater
ASTM A249 and A269 standard stainless steel welded pipes are extensively used in superheater applications due to their excellent resistance to high-temperature oxidation and corrosion. For superheater applications, the materials must withstand high temperatures and pressures, which is why the chemical composition and heat treatment processes defined by these standards are critical for ensuring the pipes' strength and durability. The pipes are subjected to various tests, such as hydrostatic testing and nondestructive electric tests, to ensure their quality and reliability in the extreme environments of a superheater.
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Heat-exchanger
Heat-exchanger
ASTM A249 and A269 standards are important for stainless steel welded pipes used in heat exchanger applications. These specifications govern the manufacturing process, quality, and properties of austenitic stainless steel welded tubes designed to handle high temperatures and corrosive conditions. In heat exchanger applications, these pipes' durability and ability to resist corrosion are crucial, as they are used to transfer heat between two or more fluids. The stainless steel's resistance to pitting, stress corrosion cracking, and crevice corrosion is essential to maintain the heat exchanger's functionality and to prevent failures that could be costly or dangerous. Regular testing, as per the standards' requirements, ensures that the pipes will perform reliably even under the thermal cycling and chemical exposure typical of heat exchangers.
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Condenser
Condenser
In condenser systems, stainless steel welded pipes play a critical role in condensing the steam or vapor into a liquid state by removing heat. The corrosion resistance properties of the stainless steel are vital, as the condensers can handle different types of coolants which may be corrosive. The tubes need to maintain their structural integrity and surface smoothness to ensure efficient heat transfer and to prevent any fouling or scaling, which could reduce the condenser's performance. Both standards ensure that the stainless steel welded pipes used in condensers are capable of meeting the rigorous demands of heat transfer applications while providing reliability and longevity in potentially corrosive environments.
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Distillation Column
Distillation Column
ASTM A249 and A269 standards specify requirements for stainless steel welded tubes in distillation column applications: ASTM A249 is designed for welded austenitic tubes in high-temperature environments, requiring an automatic welding process, post-weld heat treatment, and comprehensive mechanical and nondestructive testing. These tubes are ideal for parts of distillation columns, including reboilers and condensers, where high temperature and structural integrity are critical. ASTM A269 covers both seamless and welded austenitic stainless steel tubing with an emphasis on corrosion resistance, suitable for less extreme temperature and pressure conditions in distillation processes. Tubes must pass thermal treatment and nondestructive tests to ensure quality and corrosion resistance. Choosing between ASTM A249 and A269 for distillation columns hinges on process-specific factors like temperature, pressure, and corrosive exposure. ASTM A249 tubes are preferable for high-temperature zones, whereas ASTM A269 tubes are adequate for areas where corrosion resistance is the priority.
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