Ensure optimal thermal efficiency and structural longevity in your industrial furnaces with our premium ASTM A351 Gr. HK40 Intermediate Tube Sheet. Engineered specifically for fired heaters, reformer furnaces, and petrochemical processing units, this high-temperature alloy casting is designed to support, guide, and protect vital radiant tubes under extreme operating conditions.

Why Choose Our HK40 Intermediate Tube Sheets?

Exceptional Heat Resistance: Manufactured from ASTM A351 Grade HK40 (Austenitic stainless steel), our tube sheets deliver unmatched structural stability at temperatures up to 1050 °C (1920 °F).
Superior Creep & Carburization Resistance: The specialized chemical composition (approx. 25% Chromium and 20% Nickel) ensures maximum durability against thermal cycling, carburization, and oxidation in harsh process environments.
Precision Casting & Machining: Produced using advanced static or centrifugal casting techniques, resulting in a fine-grained, high-density microstructure free from casting defects like porosity and slag inclusions.
Custom OEM Capabilities: Fully machined and fabricated according to your exact engineering blueprints, ensuring perfect alignment and seamless integration into your existing fired heater or cracking furnace.

Material Specifications (ASTM A351 HK40)

Grade: ASTM A351 Gr. HK40 (UNS J94204)
Equivalent Standards: JIS SCH22, DIN 1.4848
Chemical Composition:
- Chromium (Cr): 23.00 - 27.00 %
- Nickel (Ni): 19.00 - 22.00 %
- Carbon (C): 0.35 - 0.45 %
Operating Temperature: 800 °C - 1100 °C
Mechanical Properties: Tensile Strength ≥ 425 MPa, Yield Strength ≥ 240 MPa

Typical Applications

Petrochemical processing heaters
Hydrogen and ammonia reformers
Ethylene pyrolysis furnaces
Oil and gas refinery fired heaters
Industrial heat treatment equipment

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Enhanced Heat Transfer Tube

Fin Tube Support

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Heat Exchanger Tube

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Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube

Copper Alloy Steel Heat Exchanger Tube

Titanium Alloy Steel Heat Exchanger Tube

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Carbon Steel Heat Exchanger Tubes

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Nickel Alloy Steel Boiler Tube

Stainless Steel Boiler Tube

Duplex Stainless Steel Boiler Tube

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Carbon Steel Boiler Tube

Fired Heater Parts

Baffle Plate

Tubesheet

products details

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube