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ASTM A179 Irregular Carbon Steel U Bend Tube Heat Exchanger Tube Boiler Tube

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ASTM A179 Irregular Carbon Steel U Bend Tube Heat Exchanger Tube Boiler Tube

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Brand Name : YUHONG

Model Number : ASTM A179 Seamless Carbon Steel U Bend Tube

Certification : ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008

Place of Origin : CHINA

MOQ : 1000KGS

Payment Terms : L/C,T/T

Delivery Time : 7 DAYS

Packaging Details : PLYWOOD CASE, BUNDLE, WOVEN BAG

Product Name : U Bend Tube

Standard : ASTM A179, ASME SA179

O.D. : 6.35MM , 9.52MM, 12.7MM , 15.88MM , 19.05MM, 20MM, 22,23MM, 25MM, 25.4MM , 31.75MM, 38.1MM , 44.45MM, 50.8MM , 63.5MM , 76.2MM, 88.9MM, 101.6MM, 152.4MM

W.T. : 0.89MM, 1MM, 1.24MM, 1.5MM, 1.65MM, 2MM, 2.11MM, 2.463MM, 2.5MM, 2.77MM, 3.05MM, 3.4MM

Radius : can be customized

NDT : ET , UT, HT

Application : Boiler, Heat Exchanger, Oil and Gas Plant, Cooling, Condenser

High Light : ASME SA179 Carbon Steel Seamless Tube, SA179 Heat Exchanger Tube

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ASTM A179 Heat Exchanger Tube Low Carbon Steel Seamless U Bend Tube

The effect of irregular bend structures in oscillating heat pipes (OHPs) on thermal performance and unidirectional flow can be analyzed through several key mechanisms:

Thermal Performance

  1. Oscillation Dynamics:

    • Disruption vs. Enhancement: Irregular bends may disrupt regular oscillatory motion, potentially dampening oscillations and reducing heat transfer efficiency. Conversely, they could introduce turbulence or chaotic mixing, enhancing heat transfer by breaking thermal boundary layers.

    • Local Pressure Variations: Non-uniform bends create asymmetric pressure gradients, affecting vapor-liquid phase distribution. Sharp bends may increase pressure drops, while smoother sections could aid flow recovery, influencing thermal resistance.

  2. Fluid Distribution and Dry-Out:

    • Irregular geometries might lead to uneven fluid distribution, increasing the risk of dry-out in regions with poor fluid return. However, strategic irregularities could promote capillary-driven fluid replenishment in critical areas.

  3. Heat Transfer Mechanisms:

    • Enhanced nucleation sites in irregular bends might improve boiling/evaporation efficiency. Conversely, stagnant zones due to flow separation could reduce effective heat transfer areas.

Unidirectional Flow

  1. Directional Bias:

    • Asymmetrical bends can act as passive check valves, favoring net flow in one direction. This mimics a hybrid OHP-traditional heat pipe behavior, potentially reducing start-up time and improving heat transport under high loads.

  2. Oscillation vs. Circulation:

    • Moderate irregularities may sustain oscillations while promoting a directional bias. Excessive asymmetry might suppress oscillations, converting the OHP into a less effective continuous-flow system.

ASTM A179 Carbon Steel Seamless Tube Chemistry Composition:

C, %
Mn, %
P, %
S, %

0.06-0.18
0.27-0.63
0.035 max
0.035 max

ASTM A179 Carbon Steel Seamless Tube Mechanical Properties:

Tensile Strength, MPa
Yield Strength, MPa
Elongation, %
Hardness, HRB
325 min
180 min
35 min
72 max

ASTM A179 Carbon Steel Seamless Tube Outside Diameter & Tolerance

Outside Diameter, mm Tolerance, mm
3.2≤OD＜25.4 ±0.10
25.4≤OD≤38.1 ±0.15

38.1＜OD＜50.8

 ±0.20
50.8≤OD＜63.5 ±0.25
63.5≤OD＜76.2 ±0.30
76.2 ±0.38

ASTM A179 Carbon Steel Seamless Tube Wall thickness & Tolerance

Outside Diamter, mm Tolerance, %
3.2≤OD＜38.1 +20/-0
38.1≤OD≤76.2 +22/-0

Other Available Materials

Standard Steel grade Tensile(MPa) Yield(MPa) Elongate(%) Hardenss
20MnG 20MnG ≥415 ≥240 ≥22
25MnG 25MnG ≥485 ≥275 ≥20
15CrMoG 15CrMoG 440～640 ≥235 ≥21
12Cr2MoG 12Cr2MoG 450～600 ≥280 ≥20
12Cr1MoVG 12Cr1MoVG 470～640 ≥255 ≥21
12Cr2MoWVTiB 12Cr2MoWVTiB 540～735 ≥345 ≥18
10Cr9Mo1VNb 10Cr9Mo1VNb ≥585 ≥415 ≥20
ASME SA210 SA210A-1 ≥415 ≥255 ≥30 ≤143HB
SA210C SA210C ≥485 ≥275 ≥30 ≤179HB
ASME SA213 SA213 T11 ≥415 ≥205 ≥30 ≤163HB
SA213 T12 SA213 T12 ≥415 ≥220 ≥30 ≤163HB
SA213 T22 SA213 T22 ≥415 ≥205 ≥30 ≤163HB
SA213 T23 SA213 T23 ≥510 ≥400 ≥20 ≤220HB
SA213 T91 SA213 T91 ≥585 ≥415 ≥20 ≤250HB
SA213 T92 SA213 T92 ≥620 ≥440 ≥20 ≤250HB
DIN17175 ST45.8/Ⅲ 410～530 ≥255 ≥21 /
15Mo3 15Mo3 450～600 ≥270 ≥22
13CrMo44 13CrMo44 440～590 ≥290 ≥22
10CrMo910 10CrMo910 480～630 ≥280 ≥20

Applications:

  • Pharmaceutical Equipment
  • Chemical Equipment
  • Sea Water Equipment
  • Heat Exchangers
  • Condensers
  • Pulp and Paper Industry
  • Off-Shore Oil Drilling Companies
  • Power Generation
  • Petrochemicals
  • Gas Processing
  • Specialty Chemicals
  • Pharmaceuticals

ASTM A179 Irregular Carbon Steel U Bend Tube Heat Exchanger Tube Boiler Tube


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