ASTM A376 TP347H solid Spiral High Frequency weld HFW Fin Tube With 11Cr
Brand Name:YUHONG
Certification:ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
Model Number:ASTM A376 TP347H
Minimum Order Quantity:1000KG
Delivery Time:15-30DAYS
Payment Terms:T/T, L/C at sight
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Ningbo Zhejiang China
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20TH FLOOR,NO.1 NEW WORLD BUILDING ,NO.1018 MINAN ROAD,YINZHOU DISTRICT, NINGBO CITY, ZHEJIANG PROVINCE, CHINA
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ASTM A376 TP347H solid Spiral High Frequency weld HFW Fin Tube With
11Cr
This is a fintube that uses ASTM A376 TP347H austenitic stainless
steel bare tube as the base tube and is covered with 11% chromium
(11Cr) low-alloy steel fins.
The base tube has excellent high-temperature strength, creep
resistance and corrosion resistance, and is suitable for
high-pressure and high-temperature conditions (such as power
station boiler superheaters); 11Cr steel fins are low-cost and have
a certain resistance to high-temperature oxidation, and are often
used for contact with external flue gas/airflow.
This design optimizes costs while meeting the stringent
requirements of the internal medium, but it is necessary to be
vigilant about the electrochemical corrosion that may occur between
the stainless steel base tube and the low-alloy steel fins in a
humid/electrolyte environment, and ensure that the operating
temperature of the fin does not exceed its oxidation resistance
limit (about 650℃). It is mainly used in high-temperature heat
exchangers, waste heat boilers and other equipment.
Chemical Analysis
| Element | 347 | 347H |
| Chromium | 17.00 min.-19.00 max. | 17.00 min.-19.00 max. |
| Nickel | 9.00 min.-13.00 max. | 9.00 min.-13.00 max. |
| Carbon | 0.08 | 0.04 min.-0.10 max. |
| Manganese | 2.00 | 2.00 |
| Phosphorus | 0.045 | 0.045 |
| Sulfur | 0.03 | 0.03 |
| Silicon | 0.75 | 0.75 |
| Columbium & Tantalum | 10 x (C + N) min.-1.00 max. | 8 x (C + N) min.-1.00 max. |
| Iron | Balance | Balance |
Mechanical Properties
| Yield Strength 0.2% Offset | Ultimate Tensile Strength | Elongation in 2 in. | Hardness | ||
| psi (min.) | (MPa) | psi (min.) | (MPa) | % (min.) | (max.) |
| 30,000 | 205 | 75,000 | 515 | 40 | 201 Brinell |
Application
Power station boilers: economizers, air preheaters, using flue gas
waste heat to preheat air/feed water.
Waste heat generator (HRSG): Recover gas turbine exhaust heat to
improve overall energy efficiency.
Heating furnace convection section: Increase the preheating
temperature of crude oil, heavy oil and other media (e.g.
atmospheric pressure furnace, reduced pressure furnace).
Catalytic cracking unit: Regeneration flue gas waste heat recovery
(high wear and corrosion resistance requirements).
Natural gas processing: acid gas (H₂S/CO₂) heat exchanger (requires
sulfur-resistant materials such as N08825/duplex steel).
Industrial boilers and heating, high-efficiency condensing boilers
ASTM A376 TP347H solid Spiral High Frequency weld HFW Fin Tube With 11Cr
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