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ASTM A249 TP304 stainless steel tubes are designed for pressure vessel systems including boiler, super-heater, heat exchanger and condenser, ASTM A249 standard specifies the manufacturing, grades, tolerance, tests, and other conditions for welded tubes, we produce ASTM A249 tubes using the TIG welding and plasma welding processes from flat-rolled strips, ASTM A249 304 is the most used stainless steel grade with excellent corrosion resistance and properties.
The A249 stainless steel 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 TP304 Stainless Steel Tube Specifications| Standard | ASTM A249 |
|---|---|
| Material | TP304 |
| Tube Type | Welded Tube |
| Finishes | Annealing Pickling, Bright Annealing |
| Outside Diameter | 6 Up To 304.8 Mm |
| Thickness | 0.5 Up To 6 Mm |
| Application | Heat Exchanger System |
| Grade | C | Si | Mn | Cr | Ni | S | P | Fe |
|---|---|---|---|---|---|---|---|---|
| TP304 | 0,08 | 1,0 | 2 | 18 – 20 | 8 – 11 | 0,03 | 0,045 | Bal. |
| Grade | Tensile Strength (Mpa) | Yield Point (Mpa) | Elongation (%) |
|---|---|---|---|
| TP304 | 515 | 205 | 35 |
ASTM A249 specification nominal-wall-thickness welded tubes and heavily cold-worked welded tubes made from austenitic steels, with various grades intended for such use as boiler, superheater, heat exchanger, or condenser tubes, for welded tubes, dual standard ASTM A249/A269 is used for heat exchanger tubes.
StripQuality welded tube is made from the quality strip, quality requires fine edge conditions and uniform wall.
TIG WeldingWe use the tungsten inert gas (TIG) welding method, TIG is an automatic process of welding two edges of a strip and forming a tubular shape, this process achieves a precise joint between the bead and base metal.
Related: TIG Welding Stainless Steel Tube
Cold WorkingAfter welding, the inside and outside of the tube must be forged to achieve high integrity, then have correct properties, and also possess precise dimensions.
Heat TreatmentAnnealing is a very important process, tubes are heated to the required solution temperature and rapidly cooled, ASTM A249 TP304 stainless steel requires a minimum solution temperature is 1040 degrees, it can restabilize microstructure to ensure premium properties.
Bright Annealing OptionBright annealing welded tube is often required, The tube passes through in closed furnace, inserting hydrogen gas to isolate the surrounding atmosphere, finally forming a passive oxide film on the surface.
Related: Bright Annealing Tubing
ASTM A249 TP304 Stainless Steel Tubes SizesWe offer large sizes and dimensions for heat exchanger tubes, common sizes are provided below, and others are available.
Outside Diameter: 12.7, 15.88, 19.05, 25.4, 31.8, 38.1, 45, 50.8, 60.3, 76.2 mm
Wall Thickness: 0.51, 0.71, 0.89, 1.0, 1.25, 1.65, 2.11, 2.77, 3.05 mm.
Most Common Types of ASTM A249 TP316 Tubes
| 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 | … |
| 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 |
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.
UNSUNS 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.
Dimensional InspectionAll the tubes should meet to requirements of ASTM A249 specification, including tolerance of the tube outside diameter (OD), wall thickness, and length, and minimum wall thickness tube is available.
ASTM A249 TolerancesDimensional 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 |
There are destructive tests are performed on tube samples these tests have tests flattening test, flange test, and reverse bend test.
Hardness TestASTM A249 TP304 requires hardness in Rockwell B90 maximum.
Corrosion Tests (Optional)ASTM A249 specification requires corrosion testing in SUPPLEMENTARY REQUIREMENTS, the purchaser should indicate the test when it is needed, intergranular corrosion and weld decay tests are considered widely to be a reliable corrosion test.
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.
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