Corrosion Resistant Stainless Steel Heat Exchanger Tube Bundle with Custom Fin Tube and Seamless Tube

Yuhong Group Co., Ltd. is an integrated manufacturer of high-grade raw tubing, pressure equipment components, and direct replacement thermal cores. We design and fabricate custom heat exchanger tube bundle assemblies, straight/bent tubing cores, extended surface Fin Tube modules, and heavy-forged heat exchanger tubesheet plates engineered specifically for corrosive chemical, petrochemical, and power generation duties.

Operating our own direct seamless tube mills allows Yuhong Group to control raw material metallurgy, outer diameter (OD) tolerances, and surface roughness from billet piercing to final bundle assembly. In addition to high-performance Stainless Steel Seamless Tube arrays, our material inventory includes Furnace Tube, Nickel Alloy Tube, and Copper alloy tube options. We build complete process Heat Exchanger pressure vessels and standalone core replacements built to TEMA, ASME Section VIII Division 1, and API 660 standards.

We fabricate thermal replacement cores to match OEM mechanical specifications or custom fluid dynamics across standard TEMA configurations:

• Removable U-Tube Bundles (TEMA U): Features cold-formed U-bent Heat Exchanger Tube arrays anchored to a single tubesheet. This structure accommodates differential thermal expansion between shell and tubes without generating cyclic stress on tube joints.
• Floating Head Tube Bundles (TEMA S/T): Built with a stationary heat exchanger tubesheet and an internal floating head cover, allowing complete bundle removal for mechanical hydro-blasting of aggressive shell-side foulants.
• Fixed Tubesheet Bundles (TEMA E/F): Rigid dual-tubesheet assemblies suited for clean process fluids or operating environments with minimal thermal gradients.
• Air-Cooled Finned Core Assemblies: Integrates high-density Fin Tube modules (extruded aluminum sleeve, L-foot, or embedded G-fin) onto stainless base tubes to ensure heat transfer performance in ambient air coolers.

• Austenitic Stainless Steels: 304/304L (UNS S30400/S30403) and 316/316L (UNS S31600/S31603) for general acid resistance and organic chemical handling.
• Duplex & Super Duplex Steels: Duplex 2205 (UNS S31803/S32205) and Super Duplex 2507 (UNS S32750) for high-chloride water cooling and high-yield strength applications.
• Specialty Alloys: Nickel Alloy Tube (Inconel 625, Hastelloy C276, Monel 400), ASTM A213 alloy Furnace Tube grades, and Copper alloy tube (CuNi 90/10, CuNi 70/30) for severe marine environments.

• Direct Tube Mill Integration: Manufacturing Stainless Steel Seamless Tube stock in-house guarantees tight dimensional tolerances, controlled grain size, and low surface roughness (Ra≤0.8) across every Heat Exchanger Tube.
• Precision Expansion & Weld Integrity: Automated torque-controlled expansion combined with orbital TIG strength-welding or seal-welding into serrated tubesheet grooves prevents joint leakage at working pressures exceeding 15 MPa.
• Solution Annealing for U-Bends: Cold-formed U-bend radii undergo controlled solution heat treatment to restore passivation layers and prevent Stress Corrosion Cracking (SCC) in chloride-bearing environments.
• Rigorous NDT Protocols: Inspection methods include Hydrostatic Pressure Testing, Eddy Current Testing (ET) on tubing, Positive Material Identification (PMI), Radiographic Testing (RT) on pressure welds, and Liquid Penetrant Testing (PT).

1. Pitting Resistance Equivalent Number (PREN): For seawater or chloride applications, selecting materials with adequate PREN values is critical (PREN = %Cr + 3.3%Mo + 16%N). Duplex 2205 (PREN ≥ 35) provides pitting resistance superior to 316L (PREN ≈ 25) in brackish process fluid loops.
2. Mitigating Crevice Corrosion at Tubesheet Joints: In aggressive chemical environments, mechanical tube expansion alone can leave microscopic gaps between the tube outer diameter and tubesheet hole. Specifying full-penetration orbital welding eliminates crevice sites where localized corrosion initiates.
3. Optimizing Tube Pitch Layout: Selecting a 90° or 45° square tube pitch provides accessible cleaning lanes for high-pressure hydro-blasting during plant maintenance. A 30° triangular pitch maximizes tube surface density for non-fouling process media.

• Chemical & Fertilizer Processing: Nitric acid cooling, urea synthesis loops, organic solvent condensers, and phosphoric acid reboilers.
• Petrochemical Refining: Desulfurization units, hydrocracker overhead condensers, and amine gas sweetening reboilers.
• Power & Utilities: Nuclear and fossil boiler feedwater heaters, auxiliary steam condensers, and deaerator preheaters.
• Marine & Offshore: Seawater evaporators, FPSO cooling modules, and high-pressure gas coolers.

Contact our technical sales team for engineering quotes or specification assistance on complete process Heat Exchanger vessels, replacement heat exchanger tube bundle assemblies, custom Fin Tube elements, or precision heat exchanger tubesheet fabrications: