Products Description
Product Specifications
| Standards | ASTM A249 / ASME SA249 |
| Steel Grades | TP201 TP202 TPXM-19 TPXM-29 TP304 TP304L TP304H TP304N TP304LN TP305 TP309S TP309H TP309Cb TP309HCb TP310 TP310S TP310H TP310Cb TP310HCb TP316 TP316L TP316H TP316N TP316LN TP317 TP317L TP321 TP321H TP347 TP347H TP348 TP348H TPXM-15 |
| Equivalent Standards | EN 10216-5;JIS G3463 |
| Outer Diameter (OD) | 5mm-290mm |
| Wall Thickness (WT) | 0.5mm-10mm |
| Length | 1–12 m ,customized |
| Surface Treatment | Pickled |
| Production Process | TIG welded / laser welded |
| Condition | Solution annealed |
Wastewater is highly corrosive; however, the surface of austenitic stainless steel is capable of forming a dense Cr₂O₃ oxide film, which endows it with excellent corrosion resistance, as well as good plasticity and toughness. Consequently, it can effectively withstand the chlorinated wastewater, acidic and alkaline waste liquids, and other aggressive media encountered during wastewater treatment processes.
Welded stainless steel pipe demonstrates excellent compatibility during equipment maintenance and welding operations, where manual shielded metal arc welding (SMAW) is the standard construction method. The core welding parameters offer a high degree of controllability; specifically, the welding current is lower than that required for carbon steel (typically 90–110 A for a 3.2 mm electrode), and the interpass temperature can be reliably maintained below 150°C. Welding is performed using a rapid, short-arc technique; post-weld, only cold straightening is required to correct any deformation, making the welding process both convenient and capable of producing consistent, high-quality weld profiles.
Customized Services
- Customizable pipes are available with outer diameters ranging from 5mm to 420mm and wall thicknesses from 0.5mm to 15mm; individual lengths can reach up to 12 meters, with support for cut-to-length specifications.
- We offer customized end treatments, including plain ends, beveled ends, threading, and flange connections (slip-on and weld-neck types).
- TORICH provides a range of surface treatments, such as pickling and passivation, mechanical polishing, and bright annealing.
Chemical Composition
| Grade | C | Cr | Ni | Mo | Ti | Mn | Si |
|---|---|---|---|---|---|---|---|
| TP316L | ≤0.03 | 16–18 | 10–14 | 2–3 | - | ≤2.0 | ≤1.0 |
| TP321 | ≤0.08 | 17–19 | 9–12 | - | 5×C min | ≤2.0 | ≤1.0 |
| TP310S | ≤0.08 | 24–26 | 19–22 | - | - | ≤2.0 | ≤1.5 |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| TP316L | ≥485 | ≥170 | ≥35 |
| TP321 | ≥515 | ≥205 | ≥35 |
| TP310S | ≥520 | ≥210 | ≥35 |
Possible Alternative Grades
- For wastewater treatment applications involving relatively low corrosivity-such as standard municipal sewage-TP304 may be selected as an alternative to TP316L. This choice offers lower costs, superior processing characteristics, and reduced welding difficulty, making it suitable for bulk procurement and use in conventional operating environments.
- For applications involving seawater or highly corrosive wastewater within the chemical industry, materials such as S32205 or 2507 are recommended; these grades possess strong resistance to intergranular corrosion and demonstrate excellent high-temperature performance.
- For wastewater characterized by high acidity or extreme chemical corrosivity, 904L is the recommended choice.
application Areas
ASTM A249 welded stainless steel pipes are widely utilized in heat exchangers, boilers, and ancillary equipment within wastewater treatment plants. Specific application scenarios include:
Wastewater treatment plant waste heat recovery exchangers
Wastewater cooling exchangers
Sludge treatment boilers
Chemical wastewater treatment exchangers
Industrial wastewater treatment boilers
Seawater desalination pretreatment exchangers
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
TORICH offers a wide range of packaging options, including plastic end caps, woven bags, wooden crates, and iron frames. Custom packaging solutions, logo branding, and other personalized requirements are also available to meet specific customer needs.
FAQ
Q: Can welded tubes withstand corrosive wastewater environments?
A: Yes. TIG welded seams, plus pickling and passivation, provide strong corrosion resistance. Quality is ensured via eddy current, hydrostatic, and IGC testing.
Q: How to handle scaling in pipelines?
A: Use high-pressure water flushing (1.0–1.5 MPa) with neutral cleaner. For heavy scaling, apply citric acid cleaning, then thoroughly rinse to prevent corrosion.
Q: What operating conditions are ASTM A249 tubes suitable for?
A: Suitable for heat exchangers and boilers in moderate to high temperatures, corrosive wastewater/chemical media, and wet–dry cycling environments.
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