Carbon Steel H Type And Double H Type Fin Tube ASTM A179/ASME SA179
The main differences between H-type fin tubes and double H-type fin
tubes are reflected in structure, performance and applicable
scenarios. H-type fin tubes form an "H"-shaped cross-section by
symmetrically welding two vertical fins on both sides of the base
tube. It has a large heat transfer area and medium fluid
resistance. It is suitable for conventional high-temperature
environments (such as boiler economizers and petrochemical heating
furnaces). Its fin spacing is wide, the risk of ash accumulation is
low, and it is easy to clean and maintain, with high cost
performance.
Double H-type fin tubes superimpose two sets of H-type fins on the
base tube to form a "double H" composite structure, which further
increases the heat transfer surface area and turbulence effect, and
significantly improves the heat transfer efficiency, but the fluid
resistance is higher and the structure is more complex, the
manufacturing precision requirements are strict, and the cost is
high. It is suitable for scenarios with strict requirements on heat
exchange efficiency (such as supercritical power generation units
and high-temperature cracking furnaces), but the dense fin layout
may increase the probability of ash accumulation and requires
high-frequency maintenance.
H-type fin tubes are known for their economy and easy maintenance,
while double H-type fin tubes have efficient heat transfer as their
core advantage. It is necessary to balance performance and cost
according to working conditions.
Chemical Composition Requirements
| Element | Weight Percent |
|---|
| C | 0.06~0.18 |
| Mn | 0.27~0.63 |
| P | ≤0.035 |
| S | ≤0.035 |
Mechanical Properties
T.S. min.
ksi [MPa] | 47 [325] |
|---|
Y.S. min.
ksi [MPa] | 26 [180] |
El. in 2"
min. % | 35 |
Hardness,
Max. HRB | 72 |
Fin Tube Material
| Bare Tube Materials |
| Carbon Steel Tubes | A179, A192, SA210 Gr A1/C, A106 Gr B, A333 Gr3 Gr6 Gr8, A334 Gr3
Gr6 Gr8, 09CrCuSb, DIN 17175 St35.8 St45.8, EN 10216 P195 P235
P265, GB/T3087 Gr10 Gr20, GB/T5310 20G 20MnG, |
| Alloy Steel Tubes | A209 T1 T1a,A213 T2 T5 T9 T11 T12 T22 T91,A335 P2 P5 P9 P11 P12 P22
P91,EN 10216-2 13CrMo4-5 10CrMo9-10 15NiCuMoNb5-6-4 |
| Stainless Steel Tubes | TP304/304L, TP316/TP316L TP310/310S TP347/TP347H |
| Copper Tubes | UNS12200/UNS14200/UNS70600, CuNi70/30, CuNi 90/10 |
| Titanium Tubes | Gr. 2 |
| Fin materials |
Aluminum (Alu.1100, Alu.1060)
|
Application
H-type finned tubes are widely used in the following scenarios due
to their simple structure, economical and practical, and easy
maintenance:
Power industry: boiler economizers, air preheaters, used for medium
and low temperature flue gas waste heat recovery;
Petrochemical industry: heating furnace convection section,
catalytic cracking unit, processing gas with high dust content;
Environmental protection engineering: industrial dust removal
equipment, low temperature flue gas waste heat recovery system,
suitable for environments that require regular dust cleaning;
Conventional heat exchangers: general heat exchange equipment in
chemical, papermaking and other fields, balancing heat transfer
efficiency and cost.
Double H-type finned tubes are mainly used in fields with demanding
performance requirements:
High-efficiency waste heat recovery: supercritical generator sets,
gas turbine exhaust systems, maximize heat energy utilization;
High-temperature and high-pressure environment: petroleum cracking
furnaces, synthetic ammonia reactors, withstand high temperatures
(≤800°C) and highly corrosive media;
Compact equipment: ships, offshore platforms and other
space-constrained scenarios, reduce equipment volume through
high-density fins;
High-dust environment (need to cooperate with dust cleaning
system): cement kiln exhaust heat exchange, metallurgical industry
high-temperature flue gas treatment, enhance heat transfer while
controlling dust accumulation risks.
