We offer ASTM A249/ASME SA249 welded stainless steel tube for Heat Exchanger, Condenser, and Boiler applications, the common stainless steel grades include 301/304L, 316/316L, 321, 347/347H, etc, our ASTM A249 welded tubes are manufactured from flat-rolled strip using automatic TIG welding method, which provides an excellent weld and proper corrosion resistance for the most demanding applications.
The A249 welded tubing sizes and thicknesses usually furnished are 1/8 in. [3.2 mm] in inside diameter to 12 in. [304.8 mm] in outside diameter and 0.015 to 0.320 in. [0.4 to 8.1 mm], inclusive, in wall thickness. Tubing having other dimensions may be furnished. The wall thickness of the tube can be Average Wall (A.W) and Minimum Wall (M.W.), heavy wall tubes are available.
ASTM A249 Stainless Steel Chemical Composition
| Grade | C, %, max | Mn, %, max | P, %, max | S, %, max | Si, %, max | Cr | Ni | Mo | Ti | Nb, %, | N B |
|---|---|---|---|---|---|---|---|---|---|---|---|
| TP304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0-20.0 | 8.0-11.0 | … | … | … . | … |
| TP304H | 0.04-0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0-20.0 | 8.0-11.0 | … | … | … | … |
| TP304L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0-20.0 | 8.0-13.0 | … | … | … | … |
| TP310S | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 24.0-26.0 | 19.0-22.0 | 0.75 | |||
| TP316 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0-18.0 | 11.0-14.0 | 2.00-3.00 | … | … | … |
| TP316L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | … | … | … |
| TP316H | 0.04-0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0-18.0 | 11.0-14.0 | 2.00-3.00 | … | … | … |
| TP316Ti | 0.08 | 2.00 | 0.045 | 0.030 | 0.75 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | 5x(C+N)-0.70 | … | 0.10 |
| TP321 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0-19.0 | 9.0-12.0 | … | 5C-0.70 | … | 0.10 |
| TP321H | 0.04-0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0-19.0 | 9.0-12.0 | … | 4C-0.60 | … | … |
| TP347 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0-19.0 | 9.0-13.0 | … | 10xC-1.00 | ||
| TP347H | 0.04-0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0-19.0 | 9.0-13.0 | … | … | 8xC-1.00 | … |
ASTM A249 Stainless Steel Mechanical Properties
| Grade | UNS | Yield Strength | Tensile Strength | Elongation In 2 In. Or 50 Mm | Hardness, Max | Hardness, Max |
|---|---|---|---|---|---|---|
| Designation | Min Ksi [MPa] | Min Ksi [MPa] | Min, %A, B | Rockwell | Brinell/Vickers | |
| TP304 | S30400 | 30 [205] | 75 [515] | 35 | 90HB | 192HBW/200Hv |
| TP304L | S30403 | 25 [170] | 70 [485] | 35 | 90HB | 192HBW/200Hv |
| TP304H | S30409 | 30 [205] | 75 [515] | 35 | 90HB | 192HBW/200Hv |
| TP304N | S30415 | 35 [240] | 80 [550] | 35 | 90HB | 192HBW/200Hv |
| TP310S | S31008 | 30 [205] | 75 [515] | 35 | 90HB | 192HBW/200Hv |
| TP310H | S31009 | 30 [205] | 75 [515] | 35 | 90HB | 192HBW/200Hv |
| TP316 | S31600 | 30 [205] | 75 [515] | 35 | 90HB | 192HBW/200Hv |
| TP316L | S31603 | 25 [170] | 70 [485] | 35 | 90HB | 192HBW/200Hv |
| TP316H | S31609 | 30 [205] | 75 [515] | 35 | 90HB | 192HBW/200Hv |
| TP316Ti | S31635 | 30 [205] | 75 [515] | 35 | 90HB | 192HBW/200Hv |
| TP317 | S31700 | 30 [205] | 75 [515] | 34 | 90HB | 192HBW/200Hv |
| TP317L | S31703 | 30 [205] | 75 [515] | 35 | 90HB | 192HBW/200Hv |
| TP321 | S32100 | 30 [205] | 75 [515] | 35 | 90HB | 192HBW/200Hv |
| TP321H | S32109 | 30 [205] | 75 [515] | 35 | 90HB | 192HBW/200Hv |
| TP347 | S34700 | 30 [205] | 75 [515] | 35 | 90HB | 192HBW/200Hv |
| TP347H | S34709 | 30 [205] | 75 [515] | 35 | 90HB | 192HBW/200Hv |
ASTM A249 Material Tubes
Common Grades
TP 201, TP201LN, TP202, TPXM-19, TPXM-29, TP301, TP304L, TP304H, TP304N, TP304LN, TP305, TP309S, TP309H, TP309Cb, TP309HCb, TP310S, TP310H, TP310Cb, TP316, TP316L, TP316H, TP316N, TP316LN, TP317, TP317L, TP321, TP321H, TP347, TP347H, TP348, TP348H, TPXM-15, Alloy 20, 800, 800H.
UNS
UNS S20100, S20153, S20910, S24000, S30400, S30403, S30409, S30415, S30451, S30453, S30500, S30615, S30815, S30908, S30909, S30601, S30940, S30941, S31008, S31009, S31040, S31041, S31050, S31254, S31266, S31277, S31600, S31603, S31609, S31651, S31653, S31655, S31700, S31703, S31725, S31726, S31727, S32050, S32053, S32100, S32109, S32615, S32654, S33228, S34565, S34700, S34709, S34800, S34809, S35045, S38100, S38815, N08020, N08367, N08800, N08810, N08811, N08926, N08904
Grades TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP316H, TP321H, TP347H, and TP348H are modifications of Grades TP304, TP309S, TP309Cb, TP310S, TP310Cb, TP316, TP321, TP347, and TP348, and are intended for high-temperature service such as for superheaters and reheaters.
ASTM A249 Dimensional Tolerances
Dimensional tolerances other than wall thickness tolerances shall be in accordance with Specification A1016/ A1016M. Wall thickness tolerances shall be +/-10 % of the nominal wall for all tubing sizes.
The wall thickness of the weld shall not exceed the wall thickness measured 90° from the weld by more than 6 % of the specified wall thickness or 0.004 in. [0.1 mm], whichever is greater.
| Specified Outside Diameter, In. [Mm] | OD, Over, In. [Mm] | OD, Under, In. [Mm] | Wall Thickness | Length, In. [Mm] |
|---|---|---|---|---|
| Under 1 [25] | 0.004 [0.1] | 0.004 [0.11] | +/-10.0% | +1/8″ (3.18) – 0 |
| 1 To 11⁄2 [25 To 40], Incl | 0.006 [0.15] | 0.006 [0.15] | +/-10.0% | +1/8″ (3.18) – 0 |
| Over 11⁄2 To 2 [40 To 50], Excl | 0.008 [0.2] | 0.008 [0.2] | +/-10.0% | +1/8″ (3.18) – 0 |
| 2 To 21⁄2 [50 To 65], Excl | 0.010 [0.25] | 0.010 [0.25] | +/-10.0% | +3/16″ [5] – 0 |
| 21⁄2 To 3 [65 To 75], Excl | 0.012 [0.3] | 0.012 [0.3] | +/-10.0% | +3/16″ [5] – 0 |
| 3 To 4 [75 To 100], Incl | 0.015 [0.38] | 0.015 [0.38] | +/-10.0% | +3/16″ [5] – 0 |
| Over 4 To 71⁄2 [100 To 200], Incl | 0.015 [0.38] | 0.025 [0.64] | +/-10.0% | +3/16″ [5] – 0 |
| Over 71⁄2 To 9 [200 To 225], Incl | 0.015 [0.38] | 0.045 [1.14] | +/-10.0% | +3/16″ [5] – 0 |
Surface Finish and Appearance
All tubes shall be furnished in the heat-treated condition in accordance with the requirements, the tubes, after final heat treatment, shall be chemically descaled or pickled free of scale. When bright annealing is used, pickling or chemical descaling is not necessary. Finished tubes shall have smooth ends free of burrs and shall not deviate from straightness by more than 0.030 in. [0.8 mm] in 3 ft [900 mm] of length.
Quality Control of ASTM A249 And ASME SA 249 Pressure Tubes
Quality control inspection and testing of tubing should be extensive and can be categorized as nondestructive tests, mechanical tests, or corrosion tests. ASME and ASTM pressure tubing specifications require that either a hydrostatic pressure test or a nondestructive electric test be performed on every length of tubing produced.
- Tension Test
- Flattening Test
- Flange Test
- Reverse-Bend Test
- Hardness Test
- Grain Size
Eddy Current Test
Pneumatic Test
Corrosion Tests (optional)
The ASTM A249-S7 weld decay test is considered widely to be a reliable corrosion test, but, in reality, the acid used in the test applies to less than 1 percent of real-life operational environments. Other tests, such as ASTM A262 practices A & E, may be far more practical for testing general corrosion.
Referenced Documents
- A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
- A480/A480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip
- A1016/A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes
- E112 Test Methods for Determining Average Grain Size
- E213 Practice for Ultrasonic Testing of Metal Pipe and Tubing
- E273 Practice for Ultrasonic Testing of the Weld Zone of Welded Pipe and Tubing
- E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
- 2.2 ASME Boiler and Pressure Vessel Code: Section VIII
- SAE J1086 Practice for Numbering Metals and Alloys (UNS)