Half Round Tube Shield Half Round Tube Shields by Ladhani Metal Corporation are precision-engineered components used to protect boiler and heat exchanger tubes from erosion, scaling, and high-temperature corrosion. These shields are widely applied in industrial systems exposed to thermal cycling, aggressive gases, and particulate flow. Their half-round shape allows for simple and secure installation over straight or curved tube surfaces, extending tube life and reducing maintenance needs. SS 420 U Type Half Round Tube Shield The SS 420 U Type Half Round Tube Shield is manufactured from hardenable martensitic stainless steel, providing robust mechanical strength, surface hardness, and oxidation resistance in high-temperature service environments. Designed specifically for U-bend sections in heat exchangers, boilers, and superheaters, this shield offers dependable protection against scaling, thermal fatigue, and particulate erosion. The U-type configuration enables targeted shielding of both the inner and outer arcs of tube bends—critical areas where temperature gradients and gas velocity are highest. • Outer U Type Half Round Tube Shield – Protects the outer curve of U-bends from slag accumulation, flame impingement, and surface wear caused by high-velocity gas flow. • Inner U Type Half Round Tube Shield – Shields the inner arc against turbulence-induced erosion, scaling, and corrosion under thermal stress conditions. Ladhani Metal Corporation supplies SS 420 U Type Half Round Tube Shields tailored to meet the demands of thermal power, petrochemical, and process industries operating in elevated temperature ranges with limited corrosive exposure. Chemical Composition of SS 420 – Hardenable Martensitic Stainless Steel • Carbon (C): 0.15 – 0.40% • Manganese (Mn): ≤ 1.00% • Phosphorus (P): ≤ 0.040% • Sulfur (S): ≤ 0.030% • Silicon (Si): ≤ 1.00% • Chromium (Cr): 12.0 – 14.0% • Nickel (Ni): ≤ 0.75% • Iron (Fe): Balance Applications: Ideal for systems requiring wear resistance, oxidation stability, and mechanical strength in dry, heat-intensive environments. Uses • Protection of U-bend tubes in thermal power plant superheaters and reheaters • Coverage for curved tube sections in WHRBs and HRSGs exposed to abrasive gas flow • Shielding tube bends in chemical reactors and reformers where thermal shock and particulate wear are common • Erosion prevention in return bends of condensers, evaporators, and economizers • Suitable for heat exchanger systems with low moisture and minimal chemical corrosion Features • Excellent surface hardness – SS 420 can be heat-treated for increased hardness and wear resistance, making it suitable for erosive and abrasive service. • Good oxidation resistance – Performs effectively in dry air at elevated temperatures, helping prevent surface scaling and material degradation. • Full bend protection – Offered in both inner and outer U-type forms to ensure total shielding of critical tube bend areas. • Tight and secure fit – Engineered to match tube radius and diameter, ensuring vibration-free performance and minimal exposure. • Simple installation – Can be easily mounted using banding, clamping, or light tack welding without requiring full system shutdown. • Cost-effective solution – Provides a balance of performance and affordability for moderately aggressive service conditions. Applications • thermal and captive power plants – Used on U-bends in reheaters and superheaters to combat flue gas erosion and temperature cycling. Ensures better tube life and heat retention. • refinery and process industries – Suitable for return bends in units with dry, high-temperature gas flow and minimal moisture-induced corrosion. • waste heat recovery systems – Shields U-shaped tubes in WHRBs from slag, particulate impact, and scale buildup. • cement and glass industries – Installed on high-temperature tubes exposed to solid-laden gas streams for wear resistance and surface stability. • chemical plants – Applied in select heat exchanger areas where scaling and erosion are more critical than chemical corrosion. Conclusion The SS 420 U Type Half Round Tube Shield by Ladhani Metal Corporation offers a rugged and efficient solution for protecting U-bend tubes exposed to heat, slag, and abrasive gas flow. With its ability to resist scaling, erosion, and surface fatigue, SS 420 is ideal for industries operating in dry, high-temperature environments. Precision fit, dual-arc protection, and easy installation make these shields a valuable addition to any boiler or heat exchanger system. For technical consultation, custom orders, or quotations, please contact Ladhani Metal Corporation.
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