ASME SA 249 TP316L stainless steel tube is a type of welded tube, ASME SA 249 specification specifies Aaustemitic steel welded tubes for heat exchanger systems, It is the same as ASTM A249 standard, it covers 304, 304L, 316, 316L, 321, 316Ti grade and others, 316L stainless steel is a typical grade used in harsh environments, which require good corrosion resistance steel.
SA249 tubing is manufactured to utilize automatic welding technology, these welding methods include TIG, PAW and laser welding. SA249 316L grade material is used for heat exchanger, condenser, and boiler tubes. ASME SA213 is a seamless tube specification adopted for heat exchanger tubes.
ASME SA 249 TP316L Stainless Steel Tube Specifications
| Standard | ASME SA249 |
|---|---|
| Tube Type | Welded Tube |
| Grade | TP 316L |
| Finishes | Annealing Pickling Bright Annealing Polished |
| Outside Diameter | 6 Up To 219.1 Mm |
| Thickness | 0.5 Up To 8 Mm |
316L Stainless Steel
316L stainless steel is an Austenitic steel material, it is low carbon content based on TP316, with a carbon content max 0.035%, and there is Molybdenum (Mo) alloy to be added, therefore, TP316 has good properties on corrosion resistance, TP316L grade tubes are usually used in the marine environment, particular in sulfuric acid condition.
ASME SA 249 TP316L Stainless Steel Chemical Composition, %, Max
| C | Mn | P | S | Si | Ni | Cr | Mo | Fe | |
|---|---|---|---|---|---|---|---|---|---|
| 316 | 0.08 | 2.00 | 0.045 | 0.030 | 1.0 | 11-14 | 16-18 | 2-3 | Balance |
| 316L | 0.035 | 2.00 | 0.045 | 0.030 | 1.0 | 10-14 | 16-18 | 2-3 | Balance |
ASME SA 249 TP316L Stainless Steel Properties
| Tensile Strength(Mpa), Min | Yield Point(Mpa), Min | Elongation(%), Min | Hardness, Max | |
|---|---|---|---|---|
| 316 | 515 | 205 | 35 | B90 |
| 316L | 485 | 170 | 35 | B90 |
316L Stainless Steel Alternatives
There are several alternatives of TP316 in different standards, some of them referring to chemical composition are little difference, noticing SUS316L is JIS standard grade, Ni content 12% – 15%.
- UNS S 31603
- EN 02Cr17Ni12Mo2
- DIN 1.4404
- JIS SUS316L
- China GB 022Cr17Ni12Mo2
ASME SA 249 TP316L Stainless Steel Tube
Tolerances
We offer TP316L welded stainless steel tubes conforming to ASME SA 249 / ASTM A249, outside diameter and wall thickness tolerances should be controlled according to SA249 and ASTM A1016, aiming to offer closer tolerances welded tubes.
SA249 Tubing Tolerances
| 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 |
Size Range
Tube sizes and dimensions range from 1/8 inch to 12 inch in outside diameter, wall thickness ranges from 0.02 inch to 0.3 inch, and common OD sizes are 12.7, 15.88, 19.05, 25.4, 31.8, 38.1, 45, 50.8 mm and so on.
Full-size chart of ASME A249 welded tubes for heat exchanger, see Stainless Steel Heat Exchanger Tube.
Finishes
TP316L welded tubes have annealed pickling and bright annealing finishes, ensuring the tube surface is bright, clean, and smooth, both straight and U-bend tubes are available.
Welding Bead
The welding bead should be removed, and the inside and outside beads should be ground.
Application
ASME SA 249 TP316L stainless steel tube is applied in the condenser, boiler, superheater, heat exchanger, and other pressure equipment, TP316L stainless steel has high strength and corrosion resistance characteristics compared to typical Austenitic stainless steel 304. The tubes can work under high temperatures and corrosive environments, of course, the TP316L tube is a good option, and it is durable and cost-effective.
ASME SA 249 TP316L Stainless Steel Tube In Quality Control
Dimensions
Eddy Current Test
Mechanical Properties
Quality Assurance
From raw materials to final products, we monitor each process containing the manufacturing process, quality control ensures our tubes have high quality. All the tubes should be inspected as per ASME SA249 / ASTM A1016.
Eddy Current And Air Under Water Test
The tests include destructive tests and nondestructive tests. For TP316L welded tubes, eddy current test and air underwater test are usually conducted according to standard.
Mechanical Properties
Mechanical properties tests are also required for checking the quality, such as flattening test, flaring test, flange test, and reverse bend test, they are all destructive tests.