FH® 1.4849 (ZG40Cr19Ni39Nb) Heat Resistant Steel Well-type Furnace Fixtures – Max 1150°C, Anti-Carburization

FH® 1.4849 Well-type Furnace Fixture System

Key Benefits

• Genuine 1.4849 (X15CrNiSi25-21)
  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® 1.4849 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: Why choose 1.4849 over 310S for my well-type carburizing furnace?
A: 1.4849 offers significantly higher creep strength and better anti-carburization than 310S. At 930°C with heavy loads, a 310S fixture may start sagging after 150–200 cycles, while 1.4849 typically lasts 400–600 cycles. The higher initial cost is offset by 2x longer life and fewer production interruptions. We can provide a lifecycle cost analysis for your specific conditions.

Q2: What is included in a complete FH® 1.4849 well-type furnace fixture system?
A: A standard system includes:

1 base tray – reinforced with raised feet for gas circulation

Multiple stacking baskets (quantity based on furnace depth) – open grid design

1 top grid – secures the top layer
All components are made from certified 1.4849 and designed to stack together stably.

Q3: How do I clean and maintain 1.4849 fixtures?
A: Every 80–120 cycles, remove fixtures during scheduled shutdown and lightly bead blast (glass beads, ≤0.3 MPa) to remove carbon soot and loose scale. Check base tray flatness – if sag exceeds 5 mm per 1000 mm, consider replacement. Do not hammer or heat-straighten. Avoid using carbon steel brushes.

Q4: My well-type furnace is 1300 mm diameter. Can you make a one-piece base tray?
A: For diameters over 1000 mm, we recommend segmented base trays (3–4 interlocking pieces). Segments are easier to install through the top opening without entering the furnace. They also accommodate thermal expansion better. One-piece is possible if your furnace has side or bottom access – please confirm.

Q5: Can 1.4849 fixtures be used in a well-type gas nitriding furnace?
A: Yes, 1.4849 performs well in gas nitriding (500–580°C). However, for nitriding only (not carburizing), 310S is often sufficient and more cost-effective. If you run both carburizing and nitriding in the same furnace, 1.4849 is the better choice for its versatility. All stainless steel fixtures will develop a surface nitride layer – clean every 50–80 cycles.

Q6: How do I determine how many stacking baskets I need?
A: Based on your furnace depth and part height. Example: Furnace depth = 1800 mm, base tray height = 150 mm, each basket = 250 mm tall. Usable height = 1800 – 150 – 100 (clearance) = 1550 mm → 6 baskets (6 × 250 = 1500 mm). FH® will calculate this for you during the design phase.

Q7: Do you offer spare parts or repair services?
A: Yes. We stock common components. For damaged baskets, we offer weld repair (if damage is localized) or replacement. Base trays are typically replaced rather than repaired due to their critical role. Contact us with photos for a repair assessment.

Q8: What is your warranty and do you provide material certificates?
A: 12 months against manufacturing defects (weld cracks, casting flaws, material defects). Normal creep, surface carburization, and gradual sagging are considered normal wear – not covered. Every fixture comes with a 1.4849 material test certificate (MTC) and weld/cast inspection report.