|
| ชื่อแบรนด์: | YUHONG |
| เลขรุ่น: | ASTM A269 TP316L ท่อเชื่อมสแตนเลสสตีล |
| ขั้นต่ำ: | 500กก |
| รายละเอียดการบรรจุ: | กล่องไม้ / กล่องเหล็ก / มัดพร้อมฝาพลาสติก |
| เงื่อนไขการจ่ายเงิน: | แอล/C,ที/ที |
Pressure / Mechanical Integrity
Seamless has no weld seam → inherently stronger for high pressure (e.g., > 3000 psi) and cyclic fatigue applications. Preferred for ASME Section VIII, high‑pressure steam, hydraulic lines.
Welded (with BA) – after bright annealing, the weld recrystallizes and has properties nearly equal to the base metal. Suitable for low to medium pressure (typically < 1500 psi) and non‑cyclic service.
Chemical Composition % of ASTM A269 TP316L Stainless Steel Welded Heat Exchanger Tube
| Grade | UNS Designation | C | M | P | S | Si | Ch | Ni | Mo |
| 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 A269 TP316L Stainless Steel Welded 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
|
Physical Properties of ASTM A269 TP316L Stainless Steel Welded Heat Exchanger Tube
|
Grade
|
Density
(kg/m3) |
Elastic Modulus
(GPa) |
Mean Co-eff of Thermal Expansion (m/m/0C)
|
Thermal Conductivity
(W/m.K) |
Specific Heat 0-1000C
(J/kg.K) |
Elec Resistivity
(nΩ.m) |
|||
|
0-1000C
|
0-3150C
|
0-5380C
|
At 1000C
|
At 5000C
|
|||||
|
316/L
|
8000 |
193
|
15.9
|
16.2
|
17.5
|
16.3
|
21.5
|
500 |
740 |
Why Bright Annealed for Heat Exchangers?
For heat exchanger service, surface quality directly impacts performance. The BA finish offers distinct advantages:
No Scale or Oxide: Eliminates "chalking" or flaking that could contaminate process fluids or block small tubes.
Smoother Surface (Ra ≤ 20 µin typical): Reduces fouling (deposit buildup) and improves heat transfer efficiency compared to pickled or as-welded surfaces.
Cleanliness: Ready for high-purity applications (pharma, food, ultra-pure water) without chemical cleaning.
Uniform Corrosion Resistance: The weld is fully solution annealed, eliminating galvanic effects between weld and base metal.
Application
Shell & Tube Heat Exchangers (condensers, evaporators, chillers)
U-tube bundles (BA finish allows bending without cracking)
Hydraulic & Instrumentation lines in corrosive environments
Pharmaceutical / Biotech (clean steam, WFI systems)
Chemical processing (acetic acid, chlorides, sulfites)
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