U TYPE OUTER HALF ROUND TUBE SHIELD FOR BOILER BENDS – MATERIAL GRADES, SPECIFICATIONS, AND APPLICATIONS

Ladhani Metal Corporation is a trusted manufacturer and global supplier of precision-engineered boiler tube protection systems, tailored for high-stress environments in thermal power, chemical, and petrochemical sectors. The U Type Outer Half Round Tube Shield is designed specifically for the outer curvature of U-bend tubes, which are frequently exposed to flue gas erosion, thermal fatigue, and slag impingement. These shields ensure long-term tube protection, operational safety, and performance reliability in demanding boiler systems.

What is a U Type Outer Half Round Tube Shield?
A U Type Outer Half Round Tube Shield is a semi-cylindrical metal sleeve fabricated to fit precisely over the external radius of U-bend tubes in boilers and heat exchangers. These shields serve as sacrificial barriers to protect the tube surface from mechanical wear and thermal damage. The outer radius of a bend is more prone to erosion and slag impact due to flow dynamics, and this shield mitigates that risk by absorbing heat, shock, and particulate matter.

Purpose and Functionality
The primary function of the U Type Outer Half Round Tube Shield is to extend the service life of U-bend tubes by acting as a wear-resistant covering on the outer curvature. It is manufactured to match the specific radius of the bend for a snug fit and is available with various mounting options, such as tack welding or clip-on mechanisms. These shields play a critical role in reducing maintenance costs, downtime, and unplanned outages caused by tube failures in high-temperature zones.

Key Features
· Designed for outer curvature of U-bend boiler tubes
· Shields against high-velocity flue gases, slag, and ash erosion
· Custom manufactured for precise bend radius and wall thickness
· Made from heat- and corrosion-resistant stainless steels and alloys
· Available with tack-weld or clip-on installation options
· Supports quick replacement and extended maintenance intervals

Product Range

Material Grades Offered by Ladhani Metal Corporation
U Type Outer Half Round Tube Shields are available in a wide range of heat-resistant and corrosion-resistant materials to suit varying boiler conditions and operational requirements. These include:

· Stainless Steel 304 / 304L
· Stainless Steel 316 / 316L
· Stainless Steel 310 / 310S
· Stainless Steel 410 / 420 / 430
· Cr25Ni20
· 1Cr25Ni20Si2
· Cr23Ni13
· 1Cr20Ni14Si2
· Other special alloys on request

Chemical Composition of the Following Grades

1Cr18Ni9Ti
• Carbon (C): ≤ 0.12%
• Silicon (Si): ≤ 1.00%
• Manganese (Mn): ≤ 2.00%
• Phosphorus (P): ≤ 0.035%
• Sulfur (S): ≤ 0.030%
• Chromium (Cr): 17.0 – 19.0%
• Nickel (Ni): 8.0 – 11.0%
• Titanium (Ti): ≥ 5×C and ≤ 0.80%
• Iron (Fe): Balance

Cr25Ni20 (Similar to AISI 310)
• Carbon (C): ≤ 0.20%
• Silicon (Si): ≤ 1.50%
• Manganese (Mn): ≤ 2.00%
• Phosphorus (P): ≤ 0.035%
• Sulfur (S): ≤ 0.030%
• Chromium (Cr): 24.0 – 27.0%
• Nickel (Ni): 19.0 – 22.0%
• Iron (Fe): Balance

1Cr25Ni20Si2
• Carbon (C): ≤ 0.20%
• Silicon (Si): 1.00 – 2.50%
• Manganese (Mn): ≤ 1.50%
• Phosphorus (P): ≤ 0.035%
• Sulfur (S): ≤ 0.030%
• Chromium (Cr): 24.0 – 27.0%
• Nickel (Ni): 19.0 – 22.0%
• Iron (Fe): Balance

Cr23Ni13
• Carbon (C): ≤ 0.20%
• Silicon (Si): ≤ 1.50%
• Manganese (Mn): ≤ 2.00%
• Phosphorus (P): ≤ 0.035%
• Sulfur (S): ≤ 0.030%
• Chromium (Cr): 22.0 – 24.0%
• Nickel (Ni): 12.0 – 14.0%
• Iron (Fe): Balance

1Cr20Ni14Si2
• Carbon (C): ≤ 0.15%
• Silicon (Si): 1.00 – 2.50%
• Manganese (Mn): ≤ 1.50%
• Phosphorus (P): ≤ 0.035%
• Sulfur (S): ≤ 0.030%
• Chromium (Cr): 19.0 – 21.0%
• Nickel (Ni): 13.0 – 15.0%
• Iron (Fe): Balance

Stainless Steel 304 / 304L
• Carbon (C): ≤ 0.08% / ≤ 0.03%
• Silicon (Si): ≤ 1.00%
• Manganese (Mn): ≤ 2.00%
• Phosphorus (P): ≤ 0.045%
• Sulfur (S): ≤ 0.030%
• Chromium (Cr): 18.0 – 20.0%
• Nickel (Ni): 8.0 – 12.0%
• Iron (Fe): Balance

Stainless Steel 316 / 316L
• Carbon (C): ≤ 0.08% / ≤ 0.03%
• Silicon (Si): ≤ 1.00%
• Manganese (Mn): ≤ 2.00%
• Phosphorus (P): ≤ 0.045%
• Sulfur (S): ≤ 0.030%
• Chromium (Cr): 16.0 – 18.0%
• Nickel (Ni): 10.0 – 14.0%
• Molybdenum (Mo): 2.0 – 3.0%
• Iron (Fe): Balance

Stainless Steel 310 / 310S
• Carbon (C): ≤ 0.25% / ≤ 0.08%
• Silicon (Si): ≤ 1.50%
• Manganese (Mn): ≤ 2.00%
• Phosphorus (P): ≤ 0.045%
• Sulfur (S): ≤ 0.030%
• Chromium (Cr): 24.0 – 26.0%
• Nickel (Ni): 19.0 – 22.0%
• Iron (Fe): Balance

Stainless Steel 410
• Carbon (C): 0.08 – 0.15%
• Silicon (Si): ≤ 1.00%
• Manganese (Mn): ≤ 1.00%
• Phosphorus (P): ≤ 0.040%
• Sulfur (S): ≤ 0.030%
• Chromium (Cr): 11.5 – 13.5%
• Iron (Fe): Balance

Stainless Steel 420
• Carbon (C): 0.15 – 0.40%
• Silicon (Si): ≤ 1.00%
• Manganese (Mn): ≤ 1.00%
• Phosphorus (P): ≤ 0.040%
• Sulfur (S): ≤ 0.030%
• Chromium (Cr): 12.0 – 14.0%
• Iron (Fe): Balance

Stainless Steel 430
• Carbon (C): ≤ 0.12%
• Silicon (Si): ≤ 1.00%
• Manganese (Mn): ≤ 1.00%
• Phosphorus (P): ≤ 0.040%
• Sulfur (S): ≤ 0.030%
• Chromium (Cr): 16.0 – 18.0%
• Iron (Fe): Balance

Applications
U Type Outer Half Round Tube Shields are installed in various heat exchange systems and boiler units, particularly where the outer bend is directly exposed to flue gas velocities and particulate impact:

· Superheater outer U-bend zones
· Economizer and reheater tube bends
· HRSG boiler return bends
· Biomass and coal-fired boiler U-bends
· Petrochemical heater tube curves

Manufacturing Capabilities
Ladhani Metal Corporation employs precision rolling, CNC forming, and alloy welding processes to manufacture high-quality U Type Outer Half Round Tube Shields. Custom sizes, alloy combinations, and radius dimensions are offered based on client specifications.

Fixing and Installation Options
· Tack-welded for permanent applications
· Clip-on type for quick installation and removal
· Available in dual-wrap or full-bend configurations

Conclusion
Ladhani Metal Corporation is Manufacturer, Supplier and Exporter of U Type Outer Half Round Tube Shield. Our boiler tube protection solutions are engineered to provide exceptional erosion resistance, mechanical strength, and thermal reliability. Each shield is manufactured under strict quality standards to ensure durability in the most aggressive service conditions.

For technical assistance, quotations, or custom drawings, contact us at info@ladhanimetals.com or visit www.ladhanimetal.com.

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