ASTM A249 and ASTM A269 standard specification are issued by American Society for Testing and Materials (ASTM), the two specifications indicate detailed conditions for stainless steel tube, like material, sizes, tests and other conditions.
ASTM standards organization develops and approvals technical standards, to improve materials, products, systems, and services requirements. The number following the designation indicates the year of revision, such as ASTM A249 / A249M – 18, it is current version.
ASTM A249 / A249M – 18
Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes.
ASTM A269 / A269M – 15a
Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service.
ASTM A249, ASTM A269 Specification Comparison
ASTM A249 and ASTM A269 specifications are two standards for Austenitic stainless steel tubes, there are the same requirements in technical, also they have some differences.
scope of application
ASTM A249 welded tubes are for boiler, super heater, heat exchanger, condenser system, the pressure equipment is used to transfer heat.
ASTM A269 tubing is for general service, usually, it is applied in equipment and instruments, also under low or high temperature environment, therefore, ASTM A269 tubing is also used for heat transfer equipment.
Material and grades
ASTM A249 and ASTM A269 Specifications indicate tube material is Austenitic Stainless Steel grades, which is wide used in stainless steel families, TP304, TP304L, TP316L, TP321 grade is ideal material for various applications, they have some advantages that other steels do not have.
Common Austenitic stainless steels are used in tubes.
However, in some cases, Ferritic and Duplex steel tubes are produced to comply with A249 or A269 standard, Ferritic steel tubes can reduce cost, and duplex steel tubes increase strength and longevity.
Sizes and Dimensions
Usually, ASTM A249 tubing sizes and wall thickness separately are 1/8 in (3.2 mm) in inside diameter to 12 in (304.8 mm) in outside diameter and 0.015 in to 0.32 in (0.4 – 8.1 mm). The tubing sizes and thicknesses furnished to ASTM A269 are 1/4 in. (6.4 mm) in inside diameter and larger and 0.020 in. (0.51 mm) in nominal wall-thickness and heavier.
Tube size is stated in inch or millimeter, sometimes, tube gauge (BWG) size is specified.
ASTM A249 welded tube dimensional tolerance are in accordance with ASTM A1016 specification, wall thickness tolerance is +/-10% of thickness, comparing with ASTM A269 tube size tolerance as follow.
|ASTM A249||＜25.40mm||±0.10mm||±10.00%||OD＜50.8mm +3.0mm -0mm
OD≥50.8mm +5.0 -0mm
|ASTM A269||＜38.1mm||±0.13mm||OD＜12.7mm ±15%
|OD＜38.1mm +3.20mm -0mm
OD≥38.1mm +4.80 -0mm
Tube Type ( manufacture process）
ASTM A249 indicate welded tubes, the tubes should be cold worked or cold drawn method, prior to final heat treatment. ASTM A269 tubes should be welded type or seamless type, which is made in cold finished or hot finished.
Testing and Quality Control
Both ASTM A249 and ASTM A269 specifications, after heat treatment, tubes should be pickled free of scale, when bright annealing is used, pickling is not necessary.
All the tubes under ASTM A249 and ASTM A269 standards should be heat treated condition unless in special condition, there are different annealing temperatures for different materials.
ASTM A249: flattening, flange and reverse bend, tensile testing and hardness.
ASTM A269: flaring test for seamless tubing, flange test for welded tube, reverse Flattening Test and hardness test.
Each tube should be conducted to the nondestructive test or the hydrostatic test, in many cases, nondestructive test refer to eddy current test or air underwater test.
What should be attention?
Users should distinguish between ASTM A249 and ASTM A269 specification, although they are typical standards for stainless steel tube technical requirement, but different.
In some cases, users require stainless steel tube conform to dual certified standard A249/A269, it means the tubes should comply to both ASTM A249 and ASTM A269, and get best value or result specified in the two specifications, the tubes will be high quality.
ASME SA249 is the same standard with ASTM A249 specification, ASME SA-249 is published by ASME, but ASME have no equivalent standard with ASTM A269.
DONGSHANG stainless produces welded and seamless stainless steel tubing as ASTM A269 specification, in 304/340L, 316/316L, 321 and duplex steels.
DONGSHANG stainless is a supplier of A249 304L stainless steel welded tube, A249 specification, 304L stainless steel grade, bright annealing finishing.
Dongshang Stainless offer ASTM A269 TP316L stainless steel tubing for general service, cold drawing welded and seamless process stainless steel tubing.
DONGSHANG Stainless produce welded stainless steel boiler tube as ASTM A249 and ASTM A269 specification, 316/316L stainless steel grade and others.
We are a supplier in ASTM A249 welded stainless steel tubing many years, 304/304L, 316/316L stainless steel grade conforming to A249 specification.