2535NbW + 800H Heat-Resistant Steel Furnace Cover – Ø563 × Ø531 mm

Custom High-Temperature Cylindrical Furnace Cover | OEM Manufacturing | FH® Alloy
FH® Alloy manufactures custom heat-resistant steel furnace covers for industrial furnaces, heat treatment equipment, and other high-temperature applications.

This customized cylindrical furnace cover is manufactured using a 2535NbW + 800H material combination, with a diameter specification of Ø563 × Ø531 mm. The structure is designed for demanding thermal environments where high-temperature strength, oxidation resistance, dimensional stability, and reliable installation are required.

FH® Alloy supports manufacturing according to customer drawings, samples, furnace dimensions, operating conditions, and replacement requirements.

Product Specifications

*16 mm nominal wall thickness applies if Ø563 mm and Ø531 mm are confirmed as OD and ID.

Dimensions
The main diameter specification for this furnace cover is:
Ø563 × Ø531 mm
If interpreted as outside and inside diameter:

• OD – Outside Diameter: Ø563 mm
  
• ID – Inside Diameter: Ø531 mm
  
• Nominal Wall Thickness: 16 mm
  

Other dimensions can be customized, including:

• Overall length
  
• Flange outside diameter
  
• Flange thickness
  
• Opening diameter
  
• Bolt-hole quantity
  
• Bolt-hole diameter
  
• PCD / bolt circle
  
• End-cap dimensions
  
• Support or reinforcing structure
  
• Installation tolerances
  

Final dimensions are manufactured according to the customer's engineering drawing.

2535NbW + 800H Material Combination
This product uses a 2535NbW + 800H combined material design according to the customer's structural and service requirements.

2535NbW
2535NbW is a high-Cr, high-Ni heat-resistant alloy used for furnace components exposed to demanding elevated-temperature conditions.
Depending on the actual grade specification and service environment, it can provide:

• Good high-temperature strength
  
• Good oxidation resistance
  
• Good dimensional stability
  
• Resistance to prolonged thermal exposure
  
• Suitability for heavily loaded furnace components
  

800H
800H is a nickel-iron-chromium alloy widely used in high-temperature industrial equipment.
Typical advantages include:

• Good high-temperature strength
  
• Good resistance to oxidation
  
• Good structural stability during prolonged service
  
• Suitability for fabricated and welded high-temperature components
  

Using different materials in different sections allows the structure to be optimized according to temperature, stress, fabrication requirements, and local service conditions.

Designed for High-Temperature Furnace Service
Heat-resistant steel covers are commonly used to protect or isolate critical components inside industrial furnace systems.
Depending on the application, the cover may function as:

• High-temperature protective enclosure
  
• Furnace internal cover
  
• Thermal shielding component
  
• Protective sleeve
  
• Structural enclosure
  
• High-temperature process component
  

The cylindrical design provides good structural continuity and can be adapted to different furnace installation arrangements.

Custom Cylindrical Structure
The furnace cover can be manufactured with customized structural features according to the equipment design.
Available options include:

• Open-end cylindrical cover
  
• Closed-end cylindrical cover
  
• Flange-mounted structure
  
• Machined sealing surfaces
  
• Custom openings
  
• Reinforcing plates
  
• Support brackets
  
• Lifting points
  
• Inspection holes
  
• Multi-material construction
  

The exact structure should be based on the customer's actual furnace and installation requirements.

Custom Flange & Connection Design
Flange and connection details can be fully customized.
Typical parameters include:

• Flange outside diameter
  
• Flange thickness
  
• Number of bolt holes
  
• Bolt-hole diameter
  
• Pitch circle diameter
  
• Sealing surface
• Connection opening
  
• Installation orientation
  

Accurate machining of these areas helps ensure correct alignment and reliable assembly with the furnace equipment.

Typical Applications
2535NbW + 800H heat-resistant covers can be customized for:

• Heat treatment furnaces
  
• Annealing furnaces
  
• Carburizing furnaces
  
• Continuous furnaces
  
• High-temperature process equipment
  
• Steel processing lines
  
• Furnace burner assemblies
  
• Protective atmosphere systems
  
• Petrochemical thermal equipment
  
• Custom industrial heating systems
  

The final material configuration should be selected according to the actual operating temperature, atmosphere, and mechanical load.

Manufacturing Process
Depending on the design, the production process may include:
Material Preparation → Shell Forming / Tube Production → End Component Fabrication → Assembly → Welding → Flange Machining → Dimensional Inspection → Surface Finishing → Final Inspection

Key manufacturing controls include:

• Outside and inside diameter
  
• Wall thickness
  
• Shell roundness
  
• Overall straightness
  
• Flange concentricity
  
• Weld quality
  
• End geometry
  
• Material transition area
  
• Overall dimensions
  

For large cylindrical components, controlling roundness and flange alignment is particularly important for final installation.

Key Product Advantages
2535NbW + 800H Combined Material Design
Different materials can be applied according to the thermal and structural requirements of different areas.
Large Ø563 mm Cylindrical Structure
Suitable for customized high-temperature equipment requiring large protective components.
Heavy-Wall Construction
If Ø563 / Ø531 mm represent OD / ID, the nominal wall thickness is 16 mm.
High-Temperature Performance
Designed for demanding industrial thermal environments.
Custom Flange & End Structure
Installation interface and end geometry can be manufactured according to the drawing.
Replacement Manufacturing
Existing components can be reproduced according to original drawings, samples, or measured dimensions.

Quality Control
Depending on customer requirements, inspection can include:

• Material verification
  
• Chemical composition analysis
  
• Outside / inside diameter inspection
  
• Wall thickness measurement
  
• Roundness inspection
  
• Overall dimension inspection
  
• Flange inspection
  
• Weld inspection
  
• Visual inspection
  
• Final assembly inspection
  

Additional inspection requirements can be agreed before production.

Why Choose FH® Alloy?
FH® Alloy specializes in custom heat-resistant alloy components for industrial furnaces and high-temperature equipment.
Our product range includes:

• Heat-resistant steel furnace covers
  
• High-temperature protective sleeves
  
• Radiant tubes
  
• Furnace rollers
  
• Centrifugal cast tubes
  
• Heat treatment fixtures
  
• Furnace trays and baskets
  
• Heat-resistant castings
  
• Custom high-temperature alloy fabrications
  

We support OEM manufacturing, drawing-based production, replacement manufacturing, and customized material selection for international customers.

Request a Quote
For an accurate quotation, please provide:

1. Product drawing
   
2. Outside diameter
   
3. Inside diameter or wall thickness
   
4. Overall length
   
5. Material specification
   
6. Flange dimensions
   
7. Opening dimensions
8. Operating temperature
   
9. Furnace atmosphere
   
10. Required quantity
    

Send your drawing or existing component specifications to FH® Alloy for technical review and quotation.

FAQ
Q1: Can you manufacture Ø563 × Ø531 mm heat-resistant furnace covers?
Yes. FH® Alloy can manufacture this specification and can also customize the diameter, length, flange, and connection structure according to the customer's drawing.

Q2: What is the wall thickness?
If Ø563 mm is the outside diameter and Ø531 mm is the inside diameter, the nominal radial wall thickness is 16 mm.

Q3: Can 2535NbW and 800H be used in the same component?
Yes. Different alloy materials can be used in different sections according to the engineering drawing and operating requirements.

Q4: Can the flange be customized?
Yes. Flange diameter, thickness, PCD, bolt-hole quantity, hole diameter, and sealing surface can all be customized.

Q5: Can you manufacture replacement furnace covers?
Yes. Existing components can be reproduced from technical drawings, samples, photographs, or measured dimensions.

Q6: What information is required for material selection?
Please provide the operating temperature, furnace atmosphere, mechanical load, service cycle, and expected service life.