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| نام تجاری: | YUHONG |
| شماره مدل: | لوله خم فولادی ضد زنگ ASTM A249 TP316L |
| مقدار تولیدی: | 1000 کیلوگرم |
| شرایط پرداخت: | L/C، T/T |
ASTM A249 TP316L Stainless Steel Welded Tube U Heat Exchanger Tube Bend Tubing
ASTM A249 TP316L welded U-bend tubes represent a specialized form of tubing, fabricated into a tight U-shaped configuration. Their production adheres to the ASTM A249 specification, which governs the manufacture of welded austenitic stainless steel tubing and should be cold worked before final heat treatment. The designation TP316L indicates the particular stainless steel, recognized for its exceptional resistance to corrosion, robustness at elevated temperatures, and favorable mechanical characteristics.
These U-bend tubes are primarily employed in the construction of heat exchangers, superheater and condensers. The U-bend design facilitates efficient fluid routing and optimizes the available surface area for thermal exchange. Critical parameters for the bent section, including the radius of the bend, its dimensions, surface (annealed/polish) and allowable variations, are precisely defined within the ASTM A249 standard to guarantee proper installation and performance.
Chemical Composition of ASTM A249 TP316L Stainless Steel Welded Tube U Bend Heat Exchanger Tube %
| Grade | UNS Designation | C | M | P | S | Si | Ch | Ni | Mo | N | Nb | Ti | Other |
| TP316L | S31603 | 0.035 | 2 | 0.045 | 0.03 | 1 | 16.0–18.0 | 10.0–14.0 | 2.00–3.00 | ... | ... | ... | ... |
Mechanical properties of ASTM A249 TP316L Stainless Steel Welded Tube U Bend Heat Exchanger Tube
Grade | Tensile Str (MPa) min | Yield Str 0.2% Proof (MPa) min | Elong (% in 50mm) min | Hardness | |
Rockwell B (HR B) max | Brinell (HB) max | ||||
316L | 485 | 170 | 40 | 95 | 217 |
General Inspection Scope of ASTM A249 TP316L Stainless Steel Welded Tube U Bend Heat Exchanger Tube
Chemical Analysis
Mechanical Tests (Tensile, Flattening, Flaring, Hardness Test ...)
Non-destructive Test (Eddy Current Test or Hydrostatic Test)
Dimensional Inspection
Visual Inspection
The Practical Choice for Most Heat Exchangers
For the vast majority of heat exchanger and condenser applications using TP316L, ASTM A249 welded tubes are the optimal and industry-standard choice. Their advantages are compelling:
They are cost-effective.
They offer excellent and consistent quality with a smooth internal finish.
Their dimensional uniformity makes them ideally suited for U-bending.
The rigorous, weld-focused testing of A249 provides documented confidence in the product's integrity.
Think of it this way: ASTM A213 (Seamless) is defined by what it lacks (a weld seam). A249 (Welded) is defined by what it has—a rigorously tested, high-performance weld that enables its economic and dimensional advantages. For U-bend tube bundles, the consistent wall thickness and bendability of ASTM A249 TP316L tubes often make them the superior technical and commercial solution.
Primary Application: Heat Exchangers
These tubes are the core component of U-tube bundle heat exchangers. Their design serves critical functions:
Thermal Expansion Accommodation: The U-bend allows each tube to expand and contract independently with temperature changes, eliminating thermal stress that could damage the unit.
Efficient Design: A single tube with a U-bend provides two flow legs, simplifying the tube sheet (only one end needs to be rolled or welded) and creating a compact, efficient bundle.
Maximized Surface Area: The bent configuration packs a large heat transfer area into a relatively small shell volume.
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