FH® Well-type Furnace Base Tray | Bottom Support for Pit / Well-type Furnaces

FH® Pit /Well-type Furnace Base Tray

Key Benefits

• Heavy-Load Bearing Capacity
  Reinforced rib structure and strategically placed support feet distribute weight evenly – supports tall stacks of parts or multiple baskets without center sagging.
• High Creep Strength Material
  1.4849, 310S, 2.4879 or 1.4828 heat-resistant alloys maintain dimensional stability at 850–1050°C – no progressive deformation over hundreds of cycles.
• Gas Circulation Optimized
  Raised feet create a gap between tray and furnace bottom – allows hot gas or atmosphere to flow under the lowest layer for uniform heating.
• Anti-Carburization / Anti-Nitriding
  High-silicon alloys (1.4849 / 1.4828) resist carbon and nitrogen penetration – extends service life in aggressive atmospheres.
• Custom Shape & Size
  Circular or rectangular – precisely matched to your furnace internal diameter or dimensions. Segmented options for large diameters.

Technical Specifications

Why Choose FH® Pit/ Well-type Furnace Base Trays?
1. The Foundation of Your Entire Load
The base tray supports everything above it. If it sags, cracks, or fails, the entire batch is compromised – parts may tip, baskets may bind, and heating becomes uneven. FH® base trays are engineered specifically for this critical role.

2. Design Features That Matter

3. Anti-Carburization = Longer Life

In carburizing furnaces, carbon penetrates and embrittles ordinary trays. FH® uses:

• High-silicon alloys (1.4828, 1.4849) – silicon forms a barrier against carbon diffusion
• Pre-oxidation treatment – creates stable Cr₂O₃ / SiO₂ layer
• Smooth surfaces – reduces carbon adhesion and soot buildup

Applications

• Well-type / pit carburizing furnaces
• Well-type annealing furnaces
• Well-type tempering furnaces (medium-high temperature)
• Well-type gas nitriding furnaces (with 310S or 1.4849)
• Parts: large gears, shafts, rings, dies, tooling, long tubes, heavy castings

Genuine Photos of FH® Pit/ Well-type Furnace Base Trays

Material Grade Table:

Ordering Process

1. Provide furnace internal diameter (or length × width) and depth
2. Share max load weight and operating temperature
3. Specify atmosphere (air, carburizing, endogas, nitrogen, ammonia)
4. FH® proposes material grade, grid pattern, foot height, and rib layout
5. Production: 10–20 working days
6. Delivery includes: MTC, flatness inspection report, installation guide

FAQ:

Q1: Why do I need a special base tray for my well-type furnace?
A: Placing baskets directly on the furnace floor blocks gas circulation under the bottom layer, causing uneven heating. FH® base trays feature raised feet for gas flow and reinforced ribs to distribute heavy loads evenly.

Q2: What material do you recommend for a well-type carburizing furnace at 930°C with 1200 kg load?
A: 1.4849 is our recommendation – best creep strength and anti-carburization for heavy loads at 930°C. Expected life: 400–600 cycles. 310S would be borderline at that load and temperature.

Q3: How do I clean and maintain the base tray?
A: Every 100–150 cycles, remove tray and lightly bead blast (glass beads, ≤0.3 MPa). Check flatness – if sag exceeds 5 mm over 1000 mm, consider replacement. Do not hammer or heat-straighten.

Q4: My furnace is 1400 mm diameter. Can you make a one-piece base tray?
A: For diameters over 1000 mm, we recommend segmented designs (3–4 interlocking pieces) for easier installation through the top opening. One-piece is possible with side/bottom access.

Q5: What is your warranty?
A: 12 months against manufacturing defects. Normal creep, surface carburization/nitriding, and gradual sagging are considered wear – not covered. Every tray comes with MTC and inspection report.