A249 316 316L stainless steel tube is manufactured as ASTM A249 standard specification, the A249 specifies delivery conditions of 316 welded tubes, annealed and pickling or bright annealed finishes are available, stainless steel 316 has excellent corrosion resistance in welded stainless steel heat exchanger tubes, better than 304/304L stainless steel due to adding of Mo content, A249 316/316L welded stainless steel tubing is applied for heat exchanger, super heater, boiler.
ASTM A249 316 Stainless Steel Tube Specifications
| Standard | ASTM A249/ASME SA249 |
|---|---|
| Material | 316 stainless steel |
| 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 |
ASTM A249 316 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 |
ASTM A249 316 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 |
Producing Of A249 316 316L Stainless Steel Tube
Nowadays, with the development of technology in welded stainless steel tube, in many circumstances, the seamless tube can be replaced by welded tube for the same purpose. for the A249 stainless steel welded tube, we focus on heat treatment, seam welding of important process in the welded tube production, and excellent corrosion performance.
TIG Welding & Welding Seam
TIG welding can effectively isolate from the surrounding air, not reaction, the arc in the process of tungsten argon arc welding and automatic removal of the role of the surface oxide film. The welding bead will be removed, and cold drawing will be made, and good corrosion performance.
Heat Treatment
Solution annealing is an important stage in the process of welding stainless steel tube, after full solution annealing, the tube will be soft and easy to form and fabrication, such as stainless steel U bending tube, stainless steel coiled tube, solution annealing will remove alloy segregation, and grains will recrystallize as a development of becoming stress relief. We will be concerned about annealing temperature and time depending on which stainless steel grade.
Tolerance Control As ASTM A249
| OD | WTH | L | |
|---|---|---|---|
| ＜25.40mm | ±0.10mm | ±10.00% | OD＜50.8mm +3.0mm -0mm OD≥50.8mm +5.0 -0mm |
| ≥25.4mm~38.1mm | ±0.15mm | ||
| ≥38.1mm~50.8mm | ±0.20mm | ||
| ≥50.8mm~63.5mm | ±0.25mm | ||
| ≥63.5mm~76.2mm | ±0.30mm | ||
| ≥76.2mm~101.6mm | ±0.38mm | ||
| ≥101.6mm~190.5mm | +0.38mm -0.64mm | ||
| ≥190.5mm~228.6mm | +0.38mm -1.14mm | ||
Testing Of A249 316 316L Stainless Steel Tube
Standard Testing
- Tensile Strength
- Flattening
- Flare
- Flange
- Dimensional
- PMI
- Hardness
- Eddy Current
Optional Testing
- Ultrasonic
- Hydrostatic
- Air Under Water
- Grain Size
- Corrosion
- radiographic inspection
- weld decay test
Custom Dimension Of A249 316 316L Stainless Steel Tube
| OD/WT (Mm) | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 | 1.0 | 1.2 | 1.5 | 1.65 | 2.0 | 2.11 | 2.5 | 3.0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 12.7 | Y | Y | Y | Y | Y | Y | Y | ||||||
| 14 | Y | Y | Y | Y | Y | Y | Y | Y | Y | ||||
| 15 | Y | Y | Y | Y | Y | Y | Y | Y | Y | ||||
| 16 | Y | Y | Y | Y | Y | Y | Y | Y | Y | ||||
| 19.1 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | ||
| 20 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | ||
| 22 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | ||
| 23 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | ||
| 25.4 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | |
| 28 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | |
| 30 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | |
| 31.8 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | |
| 34 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | |
| 35 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | ||
| 38.1 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | ||
| 40 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | |||
| 42.2 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | |||
| 44.5 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | |||
| 50.8 | Y | Y | Y | Y | Y | Y | Y | Y | Y | ||||
| 60.3 | Y | Y | Y | Y | Y | Y | Y | Y | |||||
| 63.5 | Y | Y | Y | Y | Y | Y | Y | Y | |||||
| 76.2 | Y | Y | Y | Y | Y | Y | Y | ||||||
| 88.9 | Y | Y | Y | Y | Y | Y | Y | ||||||
| 101.6 | Y | Y | Y | Y | Y | Y | Y |