SA 269 Stainless Steel

Types of ASTM A269 Stainless Steel Polish Tube

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Difference Between ASTM A249 and ASTM A269

ASTM A249需要广泛的mechanical testing for use in critical environments in boilers or heat exchangers. ASTM A269 requires reverse flattening, plus flange and hardness tests. It does not require tensile testing. ... It does not require tensile or hardness testing

ASTM A249, ASTM A269 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.

Specification	ASTM A249	ASTM 269
Tube Manufacturing	Welded	Welded And Seamless
Application	Boiler Superheater Heat-Exchanger Condenser	General Service
Sizes	OD: maximum 304.8 mm Wall Thickness: 0.4 – 8.1 mm	Inside Diameter: minium 3.4 mm Wall Thickness: 0.51 mm
ASTM / ASME	ASTM A249 ASME SA249	ASTM A269 / A269M
Test	Flange Test	Flange Test

• ASTM A269 “Specification for seamless and welded austenitic stainless steel tubing for general service”
• ASTM A249 “Specification for welded austenitic steel boiler, super heater, heat exchanger, and condenser tubes”

Scope Of Application

• ASTM A249 welded tubes are for boiler, super heater, heat exchanger, condenser system, the pressure equipment is used to transfer heat. Similar to the Seamless steel tubes standard specification ASTM A213.
• 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, TP316, TP316L, TP347, TP347H, TP321, TP321H, 904L grade is ideal material for various applications, they have some advantages that other steels do not have.

However, in some cases, Ferritic Stainless Steel Grade and Duplex stainless 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.

Common stainless steel grades of ASTM A249, and equivalents

• ASTM A249 TP304
• ASTM A249 TP304L
• ASTM A249 TP316/316L
• ASME SA249 TP304
• ASME SA249 TP316L

Common stainless steel grades of ASTM A269

• ASTM A269 TP304
• ASTM A269 TP304L
• ASTM A269 TP316
• ASTM A269 TP316L

Sizes And Dimension

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 size (BWG) is specified.

Size Tolerances

ASTM A249 welded tube and ASTM A269 Tubing dimensional tolerance are in accordance with ASTM A1016 specification, difference as below:

Specification	Outside Diameter	Outside Diameter	Wall Thickness	Length
A249	＜25.40mm	±0.10mm	±10.00%	OD＜50.8mm (-0, +3.0mm) OD≥50.8mm (-0, +5.0mm)
A249	≥25.4mm~38.1mm	±0.15mm	±10.00%	OD＜50.8mm (-0, +3.0mm) OD≥50.8mm (-0, +5.0mm)
A249	≥38.1mm~50.8mm	±0.20mm	±10.00%	OD＜50.8mm (-0, +3.0mm) OD≥50.8mm (-0, +5.0mm)
A249	≥50.8mm~63.5mm	±0.25mm	±10.00%	OD＜50.8mm (-0, +3.0mm) OD≥50.8mm (-0, +5.0mm)
A249	≥63.5mm~76.2mm	±0.30mm	±10.00%	OD＜50.8mm (-0, +3.0mm) OD≥50.8mm (-0, +5.0mm)
A249	≥76.2mm~101.6mm	±0.38mm	±10.00%	OD＜50.8mm (-0, +3.0mm) OD≥50.8mm (-0, +5.0mm)
A249	≥101.6mm~190.5mm	+0.38mm -0.64mm	±10.00%	OD＜50.8mm (-0, +3.0mm) OD≥50.8mm (-0, +5.0mm)
A249	≥190.5mm~228.6mm	+0.38mm -1.14mm	±10.00%	OD＜50.8mm (-0, +3.0mm) OD≥50.8mm (-0, +5.0mm)
A269	＜38.1mm	±0.13mm	OD＜12.7mm ±15% OD≥12.7mm ±10%	OD＜38.1mm (-0, +3.20mm) OD≥38.1mm (-0, +4.80mm)
A269	≥38.1mm~88.9mm	±0.25mm	OD＜12.7mm ±15% OD≥12.7mm ±10%	OD＜38.1mm (-0, +3.20mm) OD≥38.1mm (-0, +4.80mm)
A269	≥88.9mm~139.7mm	±0.38mm	OD＜12.7mm ±15% OD≥12.7mm ±10%	OD＜38.1mm (-0, +3.20mm) OD≥38.1mm (-0, +4.80mm)
A269	≥139.7mm~203.7mm	±0.76mm	OD＜12.7mm ±15% OD≥12.7mm ±10%	OD＜38.1mm (-0, +3.20mm) OD≥38.1mm (-0, +4.80mm)
A269	≥203.7mm~304.8mm	±1.01mm	OD＜12.7mm ±15% OD≥12.7mm ±10%	OD＜38.1mm (-0, +3.20mm) OD≥38.1mm (-0, +4.80mm)
A269	≥304.8mm~355.6mm	±1.26mm	OD＜12.7mm ±15% OD≥12.7mm ±10%	OD＜38.1mm (-0, +3.20mm) OD≥38.1mm (-0, +4.80mm)

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

Tube Surface

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.

Heat Treatment

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.

Mechanical Properties

• 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.

Nondestructive 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.

Dual Certification Standard

用户应该区分ASTM A249和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.