FH® High Temperature Well-type Furnace Fixtures | Alloy Steel Trays & Racks

FH® 1.4849 Well-type Furnace Fixture System

Key Benefits

• Genuine 1.4849 (ZG40Cr19Ni39Nb)
  Higher nickel, chromium, and silicon content than 310S – exceptional creep strength and anti-carburization at temperatures up to 1050°C.
• Complete System Solution
  Base tray + intermediate baskets + top grid – designed as an integrated system for stable stacking and optimal gas flow.
• Heavy-Load Bearing
  Reinforced rib structures and support feet distribute weight evenly – supports tall stacks of parts or multiple baskets without center sagging.
• Anti-Carburization Performance
  High silicon content (1.5–2.5%) forms a SiO₂ barrier against carbon penetration – extends service life in rich carburizing atmospheres.
• Gas Circulation Optimized
  Raised feet on base tray + open grid patterns allow hot gas to flow around all surfaces – uniform heating from bottom to top.
• Custom Configuration
  Circular or rectangular – precisely matched to your furnace internal diameter. Segmented options for large diameters.

Technical Specifications

Why Choose FH® 1.4849 Well-type Furnace Fixtures?
1. 1.4849 – The Superior Choice for Well-type Furnaces

2. Complete System – Designed to Work Together

3. Anti-Carburization Technology
In carburizing well-type furnaces, carbon penetrates and embrittles ordinary fixtures. FH® 1.4848 fixtures feature:

• High silicon content – forms a stable SiO₂ barrier
• Pre-oxidation treatment – creates protective Cr₂O₃ layer
• Dense surface finish – reduces carbon adhesion

4. Designed for Well-type Furnace Challenges

Applications

• Well-type / pit carburizing furnaces
• Well-type carbonitriding furnaces
• Well-type annealing furnaces (high temperature)
• Well-type hardening furnaces
• Parts: large gears, shafts, rings, dies, tooling, heavy castings, long tubes

Material Grade Table:

Genuine Photos of FH® Heat Treatment Fixtures

Ordering Process

• Provide furnace internal diameter (or L×W), depth, and access method
• Share part dimensions, max load weight per batch, and operating temperature
• Specify atmosphere (carburizing, carbonitriding, annealing, etc.)
• FH® engineers propose complete system design + 3D layout
• Confirm component quantities (one base tray + number of baskets)
• Production: 15–25 working days
• Delivery includes: MTC, inspection reports, stacking diagram, care guide
  
  

FAQ:

Q1: What does a complete FH® well-type furnace fixture system include?
A: A standard system includes three components:

• Base tray – sits on the furnace bottom with raised feet for gas circulation
• Stacking baskets – hold parts, stack on top of each other
• Top grid – secures the top layer and prevents tipping
  

All components are designed to work together for stable stacking and uniform heating. Custom configurations are available.

Q2: How do I determine the right fixture size for my well-type furnace?
A: We need three measurements:

• Internal diameter (or length × width for rectangular furnaces)
• Usable depth (from furnace bottom to the lowest interference point)
• Top opening diameter (for installation clearance)

FH® will then design fixtures that fit with proper clearance for gas flow and thermal expansion.

Q3: Why do I need raised feet on the base tray?
A: Raised feet create a gap (typically 50–150 mm) between the base tray and furnace bottom. This allows hot gas or atmosphere to flow under the lowest basket, ensuring uniform heating from bottom to top. Without raised feet, the bottom layer heats slower and unevenly.

Q4: Can FH® fixtures be used in both carburizing and nitriding furnaces?
A: Yes, FH® offers fixture solutions for both applications. However, we recommend dedicated fixtures for each atmosphere type when possible – switching between carburizing and nitriding can accelerate surface degradation. Please specify your atmosphere when ordering so we can recommend the optimal design.

Q5: My well-type furnace has a small top opening. How do I install large fixtures?
A: For furnaces with top opening smaller than the internal diameter, FH® offers segmented designs:

• Segmented base trays (3–4 interlocking pieces)
• Split or hinged baskets

These are installed piece-by-piece through the top opening and assembled inside the furnace. No furnace entry required.

Q6: Can you repair damaged FH® fixtures?
A: Yes, for localized damage:

• Cracked welds can be re-welded (by FH® or qualified shop)
• Minor sagging is not repairable – replacement recommended
• Severely carburized or nitrided fixtures become brittle and should be replaced

Contact FH® with photos for a repair assessment.