Introduction
Ladhani Metal Corporation is a leading manufacturer and global supplier of
high-performance boiler tube shields, engineered to withstand severe
operational environments found in thermal power, chemical, and petrochemical
plants. Among our specialized solutions, the U Type Inner Half Round Tube
Shield offers targeted protection for the inner radius of U-bend boiler tubes,
where erosion and thermal stress are most concentrated.
What is a U
Type Inner Half Round Tube Shield?
A U Type Inner Half Round Tube Shield is a custom-fabricated semi-cylindrical
shield specifically designed to protect the inner curve of U-bend tubes in
boilers and heat exchangers. These shields are crucial in preventing metal loss
and cracking due to the increased turbulence, erosion, and pressure
differential occurring at the inner surface of return bends. Commonly installed
in high-temperature sections such as superheaters, reheaters, and economizers,
these shields provide local reinforcement to preserve tube wall integrity and
extend operational lifespan.
Purpose and
Functionality
The U Type Inner Half Round Tube Shield acts as a sacrificial wear layer that
shields the base tube from direct exposure to ash, flue gases, and other
corrosive media. Its inner-radius profile is precisely formed to match the
curvature of the U-bend tube, ensuring full coverage and optimal performance.
It is easily replaceable during shutdowns, minimizing maintenance downtime and
long-term costs.
Key Features
· Tailored for the inner curve of U-bend tubes
· Designed to resist high-velocity flue gas erosion and thermal cycling
· Available in stainless steels and high-chromium alloys
· Precision fitment for tight-radius bends
· Suitable for tack welding or clip-on fixing
· Facilitates quick replacement during boiler maintenance
Product
Range
|
Product Name |
Description |
|
Half Round
Tube Shield |
Standard
semi-cylindrical shield for straight boiler or heat exchanger tubes. |
|
U Type
Half Round Tube Shield |
For U-bend
tube sections; protects bends from thermal stress and erosion. |
|
U Type
Outer Half Round Tube Shield |
Outer side
coverage for U-bends; higher erosion exposure protection. |
|
U Type
Inner Half Round Tube Shield |
Inner
curve protection for tight bend radii; prevents thinning. |
|
Half Round
Tube Shield for LTSH Tube |
Tailored
for Low Temperature Superheater tubes prone to corrosion. |
|
Half Round
Straight Tube Shield |
Designed
for long straight superheater or water wall tube lengths. |
|
Half Round
Tube Shield for R/H Tube |
For
high-temperature Reheater Tubes; made from high-alloy steel grades. |
|
Half Round
Tube Shield for WW Screen Tube |
Used on
water wall screen tubes exposed to flame and slag accumulation. |
|
Inner Tube
Shield for 90 Degree Bend |
Protects
inner radius of 90° bends where erosion and stress concentration occur. |
|
Boiler
Tube Shields |
General
category of protective shields for boiler tubes in all layouts. |
|
Half Round
Shield for Boiler Tube |
Versatile
design suitable for both vertical and horizontal tube arrays. |
|
Power
Plant Boiler Tube Shields |
Heavy-duty
shields made for large utility boilers in power generation sectors. |
Material
Grades Offered by Ladhani Metal Corporation
We manufacture U Type Inner Half Round Tube Shields in a wide range of
corrosion and heat-resistant materials to ensure performance in the most
demanding operating conditions. Options 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 upon 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 Inner Half Round Tube Shields are used in areas where inner bends are
exposed to intense wear conditions, including:
· Superheater
U-bend inner curves
· Economizer and reheater tube loops
· HRSG and waste heat boiler bend sections
· Biomass combustion systems
· Waste incinerator boiler return bends
Manufacturing
Capabilities
Ladhani Metal Corporation uses CNC-controlled rolling, forming, and welding
processes to manufacture custom radius shields with precision and consistency.
We accommodate special sizes, thicknesses, and alloy combinations for both
small and bulk orders.
Fixing and
Installation Options
· Tack-welded for permanent installation
· Clip-on type for faster, removable mounting
· Dual side wrap or bracketed configuration for high-vibration areas
Conclusion
Ladhani Metal Corporation is Manufacturer, Supplier and Exporter of U Type
Inner Half Round Tube Shield. Our solutions are engineered for durability,
performance, and cost-effectiveness in the most demanding heat exchange
environments. Every product is manufactured to international standards with
assured quality and traceability.
For
quotations, custom drawings, or technical consultation, contact us at info@ladhanimetals.com
or visit www.ladhanimetal.com.
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