Seamless Stainless Steel U tube

High-Precision Seamless Stainless Steel U Tubes | ASTM A213 & B163 Manufacturer

Seamless Stainless Steel U-tubes are specialized heat exchanger components engineered by cold-bending high-quality seamless straight tubes into a precise"U"configuration. Manufactured from a single solid billet without any longitudinal weld seams, these tubes provide unmatched structural integrity for high-pressure and high-temperature thermal management systems.

The unique U-bend design is a mechanical necessity for shell and tube heat exchangers, as it allows for independent thermal expansion and contraction of the tube bundle. This eliminates the need for expansion joints, reduces the equipment's overall footprint, and enables multi-pass fluid flow to maximize heat transfer efficiency.

International Compliance and Technical Standards

Our U-tubes are produced in strict accordance with global specifications to ensure performance in critical infrastructure:

• ASTM A213 / ASME SA213: Standard for seamless ferritic and austenitic alloy-steel boiler, superheater, and heat exchanger tubes.
• ASTM A789 / ASME SA789: Specification for seamless duplex stainless steel tubing.
• ASTM B163: Specification for seamless nickel and nickel alloy condenser and heat exchanger tubing.
• ASTM B161 / B167 / B668: Specialized standards for Nickel, Ni-Cr-Fe, and UNS N08028 alloys.
• EN 10216-5: European technical delivery conditions for stainless steel tubes.

Key Features and Engineering Advantages

• Optimized Thermal Management: The multi-pass U-shape design significantly increases the effective surface area within a compact shell, enhancing overall thermal efficiency.
• Unrivaled Pressure Resistance: The seamless construction eliminates weld-related weak points, allowing for higher safe working pressures in demanding environments.
• Superior Corrosion Resistance: Utilizing premium grades like 304/304L, 316/316L, and Duplex steels ensures long-term resistance to oxidation, pitting, and stress corrosion cracking (SCC).
• Space-Saving Design: Compared to straight-tube configurations, U-tube bundles offer a reduced footprint, making them ideal for offshore platforms and compact industrial facilities.
• Enhanced Fatigue Life: The absence of a weld seam prevents stress concentration, ensuring durability under constant mechanical vibration and thermal cycling.

Advanced Manufacturing Process

EveryGZH (or your brand) U-tube undergoes a rigorous, multi-stage fabrication process to ensure dimensional precision:

1. Seamless Tube Production: Starting from a solid billet, tubes are pierced and then Cold DrawnorCold Rolled to achieve tight tolerances.
2. Solution Annealing: The straight tubes are heat-treated to ensure a uniform metallurgical structure before bending.
3. Precision U-Bending: Using advanced cold-bending technology, tubes are shaped to specific radii (R) while maintaining strict wall thickness integrity at the bend.
4. Stress Relieving (Post-Bend): Heat treatment is often applied to the U-bend area to relieve residual stresses induced during the bending process.
5. Rigorous Testing: 100% integrity verification through Hydrostatic Testing,Eddy Current Testing, and dimensional verification of the leg length and pitch.

Strategic Industrial Applications

• Power Generation: Critical for condensers, feed-water heaters, and nuclear steam generators.
• Petrochemical & Refining: High-pressure heat exchangers for corrosive fluid processing.
• Marine Engineering: Compact ship condensers and saltwater cooling systems.
• HVAC & Refrigeration: High-efficiency chillers and industrial heat pumps.