ASTM A312 TP321H HWF Fin Tube with Carbon Steel Fin For Boiler

ASTM A312 TP321H HWF Fin Tube with Carbon Steel Fin

ASTM A312 TP321H is a high-carbon version of the stabilized austenitic stainless steel grade 321. The "H" designation signifies its suitability for high-temperature service, guaranteeing enhanced elevated temperature strength while maintaining excellent resistance to intergranular corrosion due to its titanium stabilization.

The ASTM A312 TP321H HWF (High-Frequency Welded) Fin Tube with Carbon Steel Fin is a specialized bimetallic component engineered for demanding heat transfer applications. It combines a TP321H stainless steel base tube with a carbon steel external fin, creating a cost-effective solution where the corrosion resistance and high-temperature strength of the base tube are critical, while the fin operates in a less aggressive environment.

Chemical Composition

Mechanical Properties (Base Tube - TP321H)

Key Features & Advantages

1.Optimized Cost-Efficiency: The carbon steel fin provides substantial cost savings compared to an all-stainless-steel construction, without compromising the core tube's performance.

2.Superior High-Temperature Strength: The TP321H base tube offers guaranteed minimum strength at elevated temperatures, making it suitable for superheater and high-temperature heat exchanger applications.

3.Excellent Intergranular Corrosion Resistance: Titanium stabilization prevents chromium carbide precipitation in the base tube during exposure to the sensitization temperature range (450°C - 850°C).

4.Robust Mechanical Bond: The HWF process creates a strong, metallurgical bond between the carbon steel fin and the stainless steel base tube, ensuring low thermal contact resistance and high durability.

5.Enhanced Heat Transfer: The extended fin surface significantly increases the external heat transfer area, improving overall thermal efficiency.

Comparison with Related Options

TP321H HWF with CS Fin vs. Solid TP321H Fin Tube:
The solid TP321H fin tube offers uniform corrosion resistance throughout but at a significantly higher material cost. The bimetallic version is the economical choice where the finned section is not exposed to a corrosive or oxidizing atmosphere severe enough to require stainless steel.

TP321H vs. TP321:
Standard TP321 has a lower maximum carbon content and prioritizes corrosion resistance. TP321H is specifically required for ASME-code high-temperature pressure components due to its guaranteed high-temperature strength.

Applications of ASTM A312 TP321H HWF FinTube

1.Power Plant Boilers: As superheater and reheater tubes in sections where the base tube must withstand high-temperature steam corrosion, while the fins are exposed to less aggressive flue gas.

2.Heat Recovery Steam Generators (HRSGs): In economizer and evaporator sections for recovering energy from turbine exhaust gases.

3.Petrochemical Heaters: For convection bank tubes in fired heaters where process-side corrosion resistance is needed, but the fin-side environment is manageable for carbon steel.

4.Industrial Air Heaters: Pre-heating combustion air or process streams, leveraging the cost-effectiveness of carbon steel fins for gas-side heat transfer enhancement.

Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories,  the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always.   The factories already got certificates like : ABS, LR, DNV-GL, BV, KR, CCS, ASME, ISO 9001, ISO14001, ISO18001, ect.

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Factory 1th: Stainless steel seamless tube, Duplex steel seamless tube, Super duplex steel seamless tube, Nickel alloy steel seamless tube;

Factory 2th: Carbon steel seamless tube, Alloy steel seamless tube; Enhanced Heat Tranfer Tube, low fin tube ,U bending workshop;
Factory 3th: High frequency welding fin tube(HFW fin tube, Solid Fin tube, Studded Tube, Serrated Fin tube, Longitudinal welding fin tube), Wound fin tube(L type fin tube, LL type fin tube,  KL type fin tube), Embedded G type fin tube , Extruded fin tube,  low fin tube, U bend & 180deg. Return;

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