High-Performance U-Tubes: Premium Stainless Steel & Nickel-Based Alloys

At GAOLIN TECH, we specialize in the engineering and manufacturing of premium U-Bend Heat Exchanger Tubes, designed to meet the rigorous demands of heat exchangers, condensers, and boilers across global industries.

By combining precision manufacturing with an extensive material portfolio—including high-grade Stainless Steel and advanced Nickel-Based Alloys—GAOLIN TECH delivers the ultimate solution for thermal efficiency, longevity, and structural integrity in critical environments.

Expanded Material Portfolio for Demanding Applications

To serve the widest range of industrial needs, we have expanded our manufacturing capabilities to include both stainless steels and specialized nickel alloys:

1. Nickel-Based Alloys (Superalloys)

For the most extreme conditions, including high-temperature oxidation and severe chemical erosion, we offer a range of nickel alloys:

●Alloy 600 / 625 (Inconel®): Exceptional strength and corrosion resistance from cryogenic to elevated temperatures.

●Alloy 800 / 800H / 825 (Incoloy®): Superior resistance to oxidation, carburization, and stress corrosion cracking.

●Alloy 400 (Monel®): Excellent resistance to seawater and hydrofluoric acid.

●Alloy C276 (Hastelloy®): Outstanding resistance to pitting and crevice corrosion in a broad range of aggressive media.

2. Premium Stainless Steel Grades

Available in a wide range of austenitic and duplex grades (304/304L, 316/316L,317L,347H, 321, 2205,S32750), our tubes maintain high purity and reliability for sensitive chemical and pharmaceutical processes.

Why Choose GAOLIN TECH U-Tubes?

1. Precision Engineering & Stress Relief

Every U-tube undergoes a specialized, numerically controlled cold-bending process to ensure accurate dimensions. Following bending, we perform critical Stress Relief Annealing on the U-bend portion to prevent stress corrosion cracking (SCC), ensuring long-term reliability in high-pressure and high-temperature environments.

2. Exceptional Surface Finish

Utilizing advanced Bright Annealing (BA), Polished, or specialized surface treatment technology, our tubes can achieve ultra-smooth internal surfaces. This effectively reduces fouling, improves flow dynamics, and makes cleaning more efficient—crucial for medical, semiconductor, and food-grade applications.

3. Large Diameter & Heavy Wall Capabilities

To support heavy industrial heat exchange systems, our advanced production lines now offer larger dimensions, reaching outer diameters of up to 88.9mm with wall thicknesses up to 10mm.

Technical Specifications

Rigorous Quality Testing & Global Services

100% Quality Assurance

Every tube is subjected to a comprehensive, non-destructive testing (NDT) suite to guarantee performance and safety:

●Specification :ASTM A688 / A803

●Eddy Current Testing (ET) & Ultrasonic Testing (UT) for defect detection.

●Hydrostatic Pressure Testing (under high pressure).

●Pneumatic Underwater Testing for leaks.

●Spectrometric Analysis (PMI) for material verification.

●Dimensional & Geometry Inspection (Bending Radius, Wall Thinning, Ovality).

Global Export Partner

As a dedicated foreign trade partner, GAOLIN TECH provides seamless international logistics, secure industrial-grade packaging, and full documentation suites (including MTRs according to EN 10204 3.1 or 3.2) to ensure your project stays on schedule.

Whether you are upgrading a petrochemical refinery, building a nuclear condenser, or manufacturing a UHP gas system, we deliver the precision and materials you need. 

Contact us today for a custom quote or technical consultation.

GAOLIN TECH – Precision Tubing. Advanced Alloys. Proven Performance.