Industrial 304H Stainless Steel Plate High Chromium-Nickel Content ASME SA240 Custom Sizes

Heat-Resistant 304H SS Plate For Furnace Components & Pressure Vessels Annealed & Pickled Surface

Products Specification

Introduction

Key Parameters

Product Types

• Sheets and Plates: Used for structural components, heat exchangers, and pressure vessels.
• Bars and Rods: Includes round, square, and hexagonal bars for machining into shafts, bolts, or gears.
• Tubes and Pipes: Seamless or welded, suitable for high-temperature fluid transport (e.g., in boilers or chemical plants).
• Wire and Mesh: Used in filters, screens, or architectural applications requiring corrosion resistance.
• Fittings and Forgings: Custom components for high-temperature systems, such as flanges or valves.

Key Characteristics

1. High-Temperature Resistance
   • Maintains strength and dimensional stability at temperatures up to ~870°C, making it ideal for applications where 304 stainless steel might lose mechanical properties.
   • Reduced risk of creep deformation under prolonged heat exposure.
2. Corrosion Resistance
   • Similar to 304, it offers excellent resistance to atmospheric corrosion, mild acids, and alkaline solutions.
   • Not suitable for highly corrosive environments (e.g., seawater or chlorides) without additional protection.
3. Weldability and Formability
   • Good weldability, though post-weld annealing may be needed to minimize carbide precipitation (sensitization) in critical applications.
   • Can be cold-formed into complex shapes, though higher carbon content slightly reduces ductility compared to 304.
4. Non-Magnetic and Hygienic
   • Austenitic structure makes it non-magnetic, suitable for applications near magnetic fields.
   • Smooth surface finish allows easy cleaning, making it usable in food processing or pharmaceutical industries.

Applications

• Power Generation: Boiler components, superheaters, and heat exchangers in thermal power plants.
• Petrochemical and Refining: Reactors, distillation columns, and pipelines for processing high-temperature fluids.
• Aerospace and Automotive: Exhaust systems, engine components, and parts exposed to combustion byproducts.
• Heat Treatment Equipment: Furnace parts, trays, and fixtures for heat-treating processes.
• Industrial Furnaces: Components in kilns, ovens, and incinerators operating at elevated temperatures.
• Chemical Processing: Vessels and tanks for storing or processing chemicals at high temperatures.

Comparison with 304 and 316 Stainless Steels

• 304 vs. 304H: 304H’s higher carbon content enhances high-temperature strength but slightly reduces corrosion resistance (due to potential carbide precipitation if not properly processed).
• 304H vs. 316H: 316H adds molybdenum (2-3%), improving corrosion resistance in harsh environments (e.g., seawater or acids), while 304H prioritizes cost-effectiveness and general high-temperature strength.

Maintenance and Considerations

• To avoid sensitization (carbide precipitation at grain boundaries), post-weld heat treatment may be required for critical applications.
• Regular cleaning with non-abrasive agents helps maintain corrosion resistance in aggressive environments.
• When selecting 304H, ensure the application’s temperature and corrosion requirements align with its properties to maximize service life.

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