SA 269 Stainless Steel

 ASTM A269 / A269M Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service

Chemical Properties:

• Carbon: n/a
• Manganese: n/a
• Potassium: n/a
• Sulfur: n/a

• Silicon: n/a
• Nickel: n/a
• Chromium: n/a
• Molybdenum: n/a

Mechanical Properties:

• Tensile Strength:
  • ksi: n/a
  • MPa: n/a
• Yield:
  • ksi: n/a
  • MPa: n/a
• Elongation in 2in. or 50mm, min. %: n/a
• Max. Hardness Rockwell B: n/a

The ASTM A269 specification covers nominal-wall-thickness, seamless and welded austenitic steel tubing for general corrosion-resisting and low- or high-temperature service.

Upon completion, all material shall:

• shall be furnished in the heat-treated condition.
• conform to the chemical composition requirements.
• different mechanical test requirements that includes, flaring test, flange test, hardness test, and reverse flattening test are presented.
• shall be subjected to the non-destructive electric test or the hydrostatic test.

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.

Size Tolerances

ASTM A269 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.

Standard	OD		WTH	L
ASTM A269	＜38.1mm	±0.13mm	OD＜12.7mm ±15% OD≥12.7mm ±10%	OD＜38.1mm +3.20mm -0mm OD≥38.1mm +4.80 -0mm
	≥38.1mm~88.9mm	±0.25mm
	≥88.9mm~139.7mm	±0.38mm
	≥139.7mm~203.7mm	±0.76mm
	≥203.7mm~304.8mm	±1.01mm
	≥304.8mm~355.6mm	±1.26mm

Tube Type ( Manufacture Process）

ASTM A269 tubes should be welded type or seamless type, which is made in cold finished or hot finished.

More specifically, the ASTM A269 specification is intended for uses such as:

• boiler
• superheater
• heat exchanger
• condenser tubes

Upon complete, the material shall :

• be furnished in the heat-treated condition in accordance with the required solution temperature and quenching method.
• conform to the prescribed tensile and hardness properties such as tensile strength, yield strength, elongation, and Rockwell hardness number.
• undergo mechanical tests such as tension test, flattening test, flange test, reverse-bend test, hardness test, and hydrostatic or nondestructive electric test.  

316 / 316L Stainless Steel Chemical Composition

Grade	C	Mn	P	S	Si	Ni	Cr	Mo
316	0.08	2.00	0.045	0.030	1.0	11-14	16-18	2-3
316L	0.035	2.00	0.045	0.030	1.0	10-14	16-18	2-3

316 / 316L Mechanical Property

Grade	Tensile Strength(Mpa)	Yield Point(Mpa)	Elongation(%)	Elongation(%)
316L	485	170	35	25
316	515	205	35	25

ASTM A269 TP316L Stainless Steel Tubing Application

From TP316L chemical composition and mechanical property data sheet, TP316L is obvious a ideal material in high temperature and corrosion environment, excellent corrosion resistance performance in wide applications.

A269 Instrumentation Tube Weight Chart

OD inches	Ave. Wall inches	D/t Ratio	ID inches	Tube Cross Sectional Area (in2)	Internal Area (in2)
0.250	0.020	12.50	0.210	0.0145	0.0346
0.250	0.028	8.93	0.194	0.0195	0.0296
0.250	0.035	7.14	0.180	0.0236	0.0254
0.250	0.049	5.10	0.152	0.0309	0.0181
0.250	0.065	3.85	0.120	0.0378	0.0113
0.375	0.020	18.75	0.335	0.0223	0.0881
0.375	0.028	13.39	0.319	0.0305	0.0799
0.375	0.035	10.71	0.305	0.0374	0.0731
0.375	0.049	7.65	0.277	0.0502	0.0603
0.375	0.065	5.77	0.245	0.0633	0.0471
0.500	0.020	25.00	0.460	0.0302	0.1662
0.500	0.028	17.86	0.444	0.0415	0.1548
0.500	0.035	14.29	0.430	0.0511	0.1452
0.500	0.049	10.20	0.402	0.0694	0.1269
0.500	0.065	7.69	0.370	0.0888	0.1075
0.500	0.083	6.02	0.334	0.1087	0.0876
0.625	0.020	31.25	0.585	0.0380	0.2688
0.625	0.028	22.32	0.569	0.0525	0.2543
0.625	0.035	17.86	0.555	0.0649	0.2419
0.625	0.049	12.76	0.527	0.0887	0.2181
0.625	0.065	9.62	0.495	0.1144	0.1924
0.625	0.083	7.53	0.459	0.1413	0.1655
0.625	0.095	6.58	0.435	0.1582	0.1486
0.625	0.109	5.73	0.407	0.1767	0.1301
0.750	0.028	26.79	0.694	0.0635	0.3783
0.750	0.035	21.43	0.680	0.0786	0.3632
0.750	0.049	15.31	0.652	0.1079	0.3339
0.750	0.065	11.54	0.620	0.1399	0.3019
0.750	0.083	9.04	0.584	0.1739	0.2679
0.750	0.095	7.89	0.560	0.1955	0.2463
0.750	0.109	6.88	0.532	0.2195	0.2223
0.750	0.120	6.25	0.510	0.2375	0.2043
0.875	0.020	43.75	0.835	0.0537	0.5476
0.875	0.028	31.25	0.819	0.0745	0.5268
0.875	0.035	25.00	0.805	0.0924	0.5090
0.875	0.049	17.86	0.777	0.1272	0.4742
0.875	0.065	13.46	0.745	0.1654	0.4359
0.875	0.083	10.54	0.709	0.2065	0.3948
0.875	0.095	9.21	0.685	0.2328	0.3685
0.875	0.109	8.03	0.657	0.2623	0.3390
0.875	0.120	7.29	0.635	0.2846	0.316L7
1.000	0.028	35.71	0.944	0.0855	0.6999
1.000	0.035	28.57	0.930	0.1061	0.6793
1.000	0.049	20.41	0.902	0.1464	0.6390
1.000	0.065	15.38	0.870	0.1909	0.5945
1.000	0.083	12.05	0.834	0.2391	0.5463
1.000	0.095	10.53	0.810	0.2701	0.5153
1.000	0.109	9.17	0.782	0.3051	0.4803
1.000	0.120	8.33	0.760	0.3318	0.4536
1.000	0.134	7.46	0.732	0.3646	0.4208
1.250	0.035	35.71	1.180	0.1336	1.0936
1.250	0.049	25.51	1.152	0.1849	1.0423
1.250	0.065	19.23	1.120	0.2420	0.9852
1.250	0.083	15.06	1.084	0.316L3	0.9229
1.250	0.095	13.16	1.060	0.3447	0.8825
1.250	0.109	11.47	1.032	0.3907	0.8365
1.250	0.120	10.42	1.010	0.4260	0.8012
1.250	0.134	9.33	0.982	0.4698	0.7574
1.500	0.035	42.86	1.430	0.1611	1.6061
1.500	0.049	30.61	1.402	0.2234	1.5438
1.500	0.065	23.08	1.370	0.2930	1.4741
1.500	0.083	18.07	1.334	0.3695	1.3977
1.500	0.095	15.79	1.310	0.4193	1.3478
1.500	0.109	13.76	1.282	0.4763	1.2908
1.500	0.120	12.50	1.260	0.5202	1.2469
1.500	0.134	11.19	1.232	0.5750	1.1921
1.500	0.148	10.14	1.204	0.6286	1.1385
1.750	0.035	50.00	1.680	0.1886	2.2167
1.750	0.049	40.82	1.902	0.3003	2.8413
1.750	0.065	26.92	1.620	0.3441	2.0612
1.750	0.083	21.08	1.584	0.4347	1.9706
1.750	0.095	18.42	1.560	0.4939	1.9113
1.750	0.109	16.06	1.532	0.5619	1.8433
1.750	0.120	14.58	1.510	0.6145	1.7908
1.750	0.134	13.06	1.482	0.6803	1.7250
1.750	0.148	11.82	1.454	0.7449	1.6604
1.750	0.165	10.61	1.420	0.8216	1.5837
2.000	0.035	57.14	1.930	0.2161	2.9255
2.000	0.049	40.82	1.902	0.3003	2.8413
2.000	0.065	30.77	1.870	0.3951	2.7465
2.000	0.083	24.10	1.834	0.4999	2.6417
2.000	0.095	21.05	1.810	0.5685	2.5730
2.000	0.109	18.35	1.782	0.6475	2.4941
2.000	0.120	16.67	1.760	0.7087	2.4328
2.000	0.134	14.93	1.732	0.7855	2.3561
2.000	0.148	13.51	1.704	0.8611	2.2805
2.000	0.165	12.12	1.670	0.9512	2.1904

ASTM A269 Steel Tubing Tolerance

Diameter Tolerance ASTM A269 Tube

NPS	ASTM A269 Tube OD Tolerance
	+		–
	inch	mm	inch	mm
1/8~1 1 /2 > 1 1 /2~4 > 4~8 > 8~18 > 18~26 > 26~34 > 34~48	1/64(0.015) 1/32(0.031) 1/16(0.062) 3/32(0.093) 1/8(0.125) 5/32(0.156) 3/16(0.187)	0.4 0.8 1.6 2.4 3.2 4.0 4.8	1/32(0.031) 1/32(0.031) 1/32(0.031) 1/32(0.031) 1/32(0.031) 1/32(0.031) 1/32(0.031)	0.8 0.8 0.8 0.8 0.8 0.8 0.8

WALL THICKNESS TOLERANCE ASTM A269 STEEL TUBE

NPS	ASTM A269 Tube Tolerance, %
	+	–
1/8-2 1 /2	20.0	12.5
3~18, t/D≤ 5%	22.5	12.5
3~18, t/D> 5%	15.0	12.5
≥ 20, welded	17.5	12.5
≥ 20, seamless, t/D≤ 5%	22.5	12.5
≥ 20, seamless, t/D> 5%	15.0	12.5

Types of ASTM A269 Stainless Steel Polish Tube

• ASTM A269 Standard Seamless Tube
• ASTM A269 Electropolish Tube
• A269 Instrumentation Tube
• ASME SA269 Cold Rolled Coiled Tubing
• SA269 Heat exchager Tube
• ASTM A269 Stainless Steel Polish Tube
• Welded ASTM A269 Stainless Tube
• ASTM A269 Steel Decorative Tube
• ASTM A269 SS EFW Tube

• A269 Stainless Steel Exhaust Tube
• A269 Stainless Capillary Tube
• A269 Steel ERW Tube
• A269 SS Hot Rolled Tube
• A269 Standard Cold Drawn Tube
• Stainless Steel ASTM A269 Santiary Tube
• Stainless ASTM A269 Round Tube
• Steel ASTM A269 Tube
• SS ASTM A269 Tubing

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Difference Between ASTM A249 and ASTM A269

ASTM A249 requires extensive 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

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.



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