Outer Tube Shield for 90 Degree Bend – Boiler Tube Bend Protection Against Erosion & Wear

Introduction
Ladhani Metal Corporation is a trusted manufacturer and exporter of specialized boiler tube shields engineered for thermal protection and erosion control. The Outer Tube Shield for 90 Degree Bend is designed specifically for the external radius of 90° bend tubes in boilers, HRSGs, and heat exchangers. It is engineered to resist high-velocity gas erosion and temperature-induced stress commonly concentrated at outer bend surfaces.

What is an Outer Tube Shield for 90 Degree Bend?
An Outer Tube Shield for 90 Degree Bend is a semi-cylindrical, precision-formed shield designed to cover the outer curvature of boiler tubes that are bent at a 90° angle. These shields offer enhanced protection where fluid velocity, ash impact, and mechanical wear are most aggressive. Unlike standard straight tube shields, they are contoured to conform to the bend radius and are typically installed on superheaters, reheaters, economizers, and water walls.

Purpose and Functionality
The primary purpose of the Outer Tube Shield for 90 Degree Bend is to protect the outer curve of boiler bend tubes, which typically face higher erosion rates due to accelerated flue gas velocities and particulate impacts. These shields serve as a sacrificial layer that absorbs wear, prevents wall thinning, and extends tube life. They can be quickly installed using tack-welding or clip-on mechanisms for easy replacement during scheduled maintenance.

Key Features
· Custom curvature for accurate fit over 90° bends
· Enhanced erosion and abrasion resistance at high-stress points
· Formed using CNC processes for dimensional precision
· Available in heat-resistant and corrosion-resistant alloys
· Offered in weld-on or clip-on installation variants
· Facilitates maintenance with fast removal and replacement
· Designed for tight bends and high-velocity impact zones

Product Range

Material Grades Offered by Ladhani Metal Corporation
Outer Tube Shields for 90 Degree Bends are manufactured from corrosion- and heat-resistant stainless steels and high-performance alloys. Available grades 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 available 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
Outer Tube Shields for 90 Degree Bends are extensively used in areas of high gas flow velocity and ash concentration, including:

· Superheater and reheater 90° bends
· Economizer return bends
· Water wall elbows
· Furnace side and convection pass turns
· Waste heat recovery units

Manufacturing Capabilities
Ladhani Metal Corporation employs advanced CNC rolling and forming equipment to produce radius-specific tube shields tailored to customer drawings or in-house design. All shields undergo dimensional inspection and material testing as per international quality standards.

Fixing and Installation Options
· Tack-welded for secure fitment
· Clip-on design for non-welded applications
· Dual and extended coverage for wide-angle bend protection

Conclusion
Ladhani Metal Corporation is Manufacturer, Supplier and Exporter of Outer Tube Shield for 90 Degree Bend. Our solutions are engineered to withstand the most challenging operational conditions in thermal power, petrochemical, and industrial boilers. We deliver precision-fit shields that combine long-lasting protection with efficient installation.

For specifications, custom sizes, or quotations, contact us at info@ladhanimetals.com or visit www.ladhanimetal.com.

PRODUCT LINKS: