Products
ASTM A249/A269/A789 TUBE

ASTM A249-18a / ASME SA249

Standard Specification for

Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, andCondenser Tubes

ASTM A269-18a

Standard Specification for

Seamless and Welded Austenitic Stainless Steel Tubing for General Service

ASTM A789 /A789M - 18

Standard Specification for 

Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing forGeneral Service

ISO 9001:2015 Certified

PED 2014/68/EC& AD 2000 Certified


ASTM A249/ASTM A269 Product Specification 

Thickness (mm)/GA

0.5

0.6

0.7

0.8

0.9

1.00

1.2

1.25

1.50

1.65

2.00

2.11

2.77

3.05

3.50

Item No.

OD (mm)








18GA


16GA


14GA

12GA

11GA


1

15.88
















2

16
















3

19.05
















4

22
















5

25
















6

25.4
















7

28
















8

31.8
















9

32
















10

33.7
















11

38.1
















12

40
















13

42
















14

45
















15

50.8
















16

63.5
















17

70
















18

76.2
















19

88.9
















20

101.6
















21

104


















For both A249 and A269 specification

For A269 specification only


Permitted Variation 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 11⁄2 

≥25.4-38.1mm

±0.15mm

2 [50.8] or over +5.0mm/-0mm

Over 11⁄2 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 21⁄2

≥50.8-63.5mm

±0.25mm

21⁄2 to 3

≥63.5-76.2mm

±0.30mm

3 to 4

≥76.2-101.6mm

±0.38mm

Over 4 to 71⁄2

≥101.6-190.5mm

+0.38/-0.64mm

Over 71⁄2 to 9

≥190.5mm-228.6mm

+0.38/-1.14mm

*In accordance with Standard ASTM A1016/A1016M.



Permitted Variation for ASTM A269 Tubes

Outer Diameter in. [mm] Tolerance

Thickness Tolerance

Length Tolerance

Up to 1/2

≤12.7mm

±0.13mm

±15%THK

+3.2mm/0mm

1/2 to 1 1/2

≥12.7-38.1mm

±0.13mm

±10% THK

+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



Chemical Composition %

Elements 304 304L 316L 310L 321
C Carbon, max
0.08 0.03 0.03 0.08 0.08
Mn Manganese, max
2.00 2.00 2.00 2.00 2.00
P Phosphorus, max
0.045 0.045 0.045 0.045 0.045
S Sulfur, max
0.030 0.030 0.030 0.030 0.030
Si Silicon, max
1.00 1.00 1.00 1.00 1.00
Ni Nickle
8.0-11.0 8.0-12.0 10.0-14.0 19.0-22.0 9.0-12.0
Cr Chromium
18.0-20.0 18.00-20.0 16.0-18.0 24.0-26.0 17.0-19.0
Mo Molybdenum
... ... 2.00-3.00 ... ...
Fe Iron
bal. bal.
bal. bal. bal.
Cu Copper
... ... ... ... ...
N Nitrogen
... ... ... ...

0.10

Bright Annealing

Hydrogen bright annealed in line to 1900 ℉(1040℃)minimum and rapidly water quenched. 



Tensile and Hardness Requirements
Grade UNS Designation
Tensile Strength,
min, ksi
[MPa]
Yield Strength,
min, ksi[MPa]
Elongation in 2 in. or 50 mm,min, %
Rockwell Hardness
Number,max
304 S30400 75[515] 30[205] 35 B90
304L S30403 70[485] 25[170] 35 B90
316L S31603 70[485] 25[170] 35 B90
310S S31008 75[515] 30[205] 35 B90
321 S32100 75[515]
30[205] 35 B90

MW Mechanical Test:

Tension Test,Flatting Test,Flange Test,Reverse-Bend Test,Hardness Test

Hydrostatic or NondestructiveElectric Test:

MW Metal each tube issubjected to 100% online eddy Current Test.

AirUnderwater Pressure Test:

MW Metal all Tubing is examined by the airunderwater pressure test. Inspection is made of the entire external surface ofthe tube after holding the pressure for not less than 10 s after the surface ofthe water has become calm. If any tube shows leakage during the air underwatertest, MW Metal reject it. 


Mechanical Testing Test 
Test
ASTM
MW Metal
Flare
Not Required
Required
Flatten
Required
Required
Flange
Required
Required
Reverse Bend
Required
Required
Tesion Test
Required
Required
Eddy Current 
Required
Required
Hydrostatic
Required
Not Required
Air Underwater Test
Not Required
Required
Surface Condition:

The tubes, after final heat treatment, shall be chemically descaled or pickled free of scale. When bright annealing is used, picking or chemical descaling is not necessary.


Marking&Packing



Packing: 

Hexagon Bundle Package

Frame Package

Crate / Boxing Package

Tags must be secured to the bundles, frames and boxes. 





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