ASTM A213 TP316L Stainless Steel Seamless U Bend Tube
Product Overview
Precision U Bend Tubes for Heat Exchanger Tube Bundles
ASTM A213 TP316L Seamless U Bend Tubes are manufactured from seamless stainless steel tubes through precision cold bending and heat treatment processes for shell and tube heat exchangers, condensers and boilers.
Compared with straight tubes, U bend tubes eliminate intermediate welded joints inside the heat exchanger, reducing potential leakage points while improving structural reliability and thermal efficiency. Each tube is bent to the specified centerline radius and inspected to ensure dimensional accuracy, wall thickness integrity and surface quality.
The low-carbon TP316L stainless steel provides excellent resistance to pitting and intergranular corrosion after welding, making these tubes suitable for chloride-containing cooling water, chemical processing fluids and industrial heat transfer systems.
Technical Specifications
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Item
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Specification
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Product Name
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ASTM A213 TP316L Seamless U Bend Tube
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Standard
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ASTM A213 / ASME SA213
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Material Grade
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TP316L / UNS S31603
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Product Type
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Seamless U Bend Tube
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Manufacturing Process
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Cold Drawn + CNC U Bending
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Bend Radius
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Customized According to TEMA
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Outside Diameter
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12.7–50.8 mm
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Wall Thickness
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0.8–3.5 mm
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Tube Length
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Customized
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Surface Finish
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Annealed & Pickled
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Heat Treatment
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Solution Annealed After Bending
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Inspection
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Hydrostatic, Eddy Current, PMI
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Certificate
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EN10204 3.1
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Chemical Composition
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Element
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Content (%)
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Carbon
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≤0.030
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Chromium
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16.0–18.0
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Nickel
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10.0–14.0
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Molybdenum
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2.0–3.0
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Manganese
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≤2.00
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Silicon
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≤1.00
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Phosphorus
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≤0.045
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Sulfur
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≤0.030
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Mechanical Properties
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Property
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Requirement
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Tensile Strength
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≥485 MPa
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Yield Strength
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≥170 MPa
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Elongation
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≥35%
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Hardness
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≤90 HRB
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Product Features
- Seamless Construction for Leak-Free Heat Transfer
Without longitudinal welds, seamless tubes provide consistent wall thickness and reliable performance under pressure.
Controlled bending minimizes wall thinning and ovality while maintaining dimensional consistency throughout the tube bundle.
- Low Carbon TP316L Material
The low carbon content improves resistance to intergranular corrosion after welding and fabrication.
- Optimized for Tube Bundle Assembly
Every U bend tube is manufactured according to customer drawings and TEMA requirements, ensuring smooth installation into tubesheets.
Each production batch can be supplied with material identification, inspection records and EN10204 3.1 certification.
Available Dimensions
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Parameter
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Range
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Outside Diameter
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12.7–50.8 mm
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Wall Thickness
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0.8–3.5 mm
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Straight Leg Length
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Customized
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Bend Radius
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Customized
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Tube Length
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According to Drawing
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Applications
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Shell & Tube Heat Exchangers
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Surface Condensers
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Waste Heat Recovery Units
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Industrial Boilers
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Petrochemical Plants
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Fertilizer Plants
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Pharmaceutical Equipment
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Food Processing Systems
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Power Stations
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Offshore Heat Exchange Equipment
Inspection & Testing
Why Choose YUHONG U Bend Tubes
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Precision cold bending with controlled bend radius
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Solution annealed after bending
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Seamless construction for pressure applications
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Customized dimensions according to TEMA drawings
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Complete inspection documentation available
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Export packaging for long-distance transportation
Frequently Asked Questions
1. What is a TP316L U bend tube used for?
TP316L U bend tubes are mainly used in shell and tube heat exchangers, condensers and boiler tube bundles.
2. Why are seamless U bend tubes preferred?
Seamless tubes eliminate longitudinal welds, providing uniform strength and reducing potential leakage points.
3. Can the bend radius be customized?
Yes. Bend radius, straight leg length and overall dimensions can be manufactured according to customer drawings or TEMA requirements.
4. What inspection reports are available?
EN10204 3.1 MTC, hydrostatic testing, eddy current testing, PMI and dimensional inspection reports are available.
Related Products
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ASTM A213 TP304 U Bend Tube
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ASTM A213 TP321 Seamless U Tube
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ASTM A213 TP347H U Bend Tube
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ASTM A179 Carbon Steel U Bend Tube
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ASTM B163 Monel 400 U Bend Tube
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ASTM B338 Titanium Grade 2 U Bend Tube
U Bend Tube vs Straight Tube
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Feature
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U Bend Tube
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Straight Tube
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Welded Joint Inside Bundle
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None
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Required in return section
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Heat Exchanger Design
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Preferred
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Standard
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Tube Bundle Assembly
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Simplified
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Additional connections may be required
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Leakage Risk
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Reduced
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Depends on joint design
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