FH® Cr25Ni20 Combined Heat Treatment Charging Basket for Salt Bath Roller Hearth Furnace

FH® Salt Bath Furnace Combined Charging Baskets 

Key Benefits

• Modular / Combination Design
  Interlocking base, side walls, dividers, and hanging frames – configure multiple basket sizes from one set of components.
• Salt-Bath Specific Design
  Optimized open area for rapid salt drainage when lifting from furnace – minimizes salt carryout and drag-out losses.
• Corrosion-Resistant Materials
  Special alloys selected for molten salt environments (chloride, nitrate, cyanide, or neutral salt baths) – resists pitting and intergranular attack.
• Thermal Shock Resistant
  Engineered to withstand repeated immersion into 500–1050°C molten salt followed by quenching – no cracking or distortion.
• Quick Drainage Geometry
  Sloped or tapered bottom bars, large drainage openings, and non-stick surfaces – salt flows off rapidly, reducing cooling and solidification on the basket.
• Easy Maintenance & Repair
  Modular components can be replaced individually – no need to discard the entire basket when one section wears out.

Technical Specifications

Why Choose FH® Salt Bath Modular Baskets?

1. Designed Specifically for Salt Bath Challenges

2. Modular/ Combined = Flexible + Cost-Effective

3. Material Selection for Salt Baths

4. Rapid Drainage – Reduce Salt Loss
Every kilogram of salt carried out of the furnace costs money and creates housekeeping issues. FH® salt bath baskets feature:

• Minimum 60% open bottom area
• Tapered or rounded bars – salt runs off instead of clinging
• Smooth, non-stick surface finish
• Optimized lifting speed recommendations

Standard Configurations

• Configuration A – Single Layer
  Base + hanging frame only – for large, heavy individual parts
• Configuration B – Multi-Layer with Dividers
  Base + side walls + 2–3 divider levels – for medium parts stacked separately
• Configuration C – Fine Parts Basket
  Base + perforated insert + lid – for small parts like fasteners, pins
• Configuration D – High-Density Stack
  Base + full-height side walls + multiple dividers – for high part density

All configurations are interchangeable using the same base module.

Applications

• Salt bath hardening (tool steel, high-speed steel)
• Salt bath tempering (nitrate salts)
• Salt bath carburizing / carbonitriding (cyanide salts)
• Martempering / austempering
• Solution treating of non-ferrous alloys
• Parts: drills, taps, dies, punches, gears, springs, fasteners, tooling/fixtures

Material Grade Table:

Genuine Photos of FH® Heat Treatment Fixtures

Ordering Process

1. Provide:

• Salt type and operating temperature
• Furnace working dimensions (depth, diameter or width)
• Part size range (minimum to maximum)
• Batch weight per cycle
• Lifting method (crane hook, manual tongs, automated hoist)

2. FH® proposes:

• Material grade based on salt chemistry
• Modular configuration (base + which modules)
• Drainage optimization
• CAD drawing for approval

3. Production: 10–20 working days

4. Delivery includes: MTC, assembly instructions, salt-bath care guide

FAQ:

Q1: Why do I need a special basket for salt bath furnaces? Can't I use my regular hardening basket?
A: Regular baskets are not designed for molten salt. They trap salt in corners and closed sections, leading to:

• Excessive salt carryout (waste and mess)
• Salt solidification inside tubes or hollow sections (impossible to clean)
• Accelerated corrosion from stagnant salt
• Thermal shock cracking
  

FH® salt bath baskets feature open drainage, non-stick surfaces, and corrosion-resistant alloys.

Q2: What does "modular" mean and why is it useful?
A: Modular means the basket is built from interchangeable components – base, side walls, dividers, inserts. Benefits:

• One base works with different side heights and dividers
• Change configuration for different part sizes without buying a new basket
• Replace only worn sections instead of the entire basket
• Easier cleaning – disassemble for full access

Q3: How do I prevent salt from sticking to the basket after removal?
A: Three factors:

• Design – open bottom and tapered bars allow salt to drain quickly
• Surface finish – smooth, non-stick surface (shot-blasted or pre-oxidized)
• Lifting speed – withdraw slowly (2–4 seconds per 100 mm) to allow drainage
  

FH® baskets are optimized for all three.

Q4: How do I clean salt residue from the basket?
A: After each use, allow the basket to cool and then:

• Soak in hot water to dissolve nitrate/nitrite salts (catch rinse water – do not drain to sewer without treatment)
• For chloride/cyanide salts, follow your plant's safety procedure (typically water rinse with neutralization)
• Light bead blasting for stubborn residue
  

Never use carbon steel brushes – they leave embedded particles that promote corrosion.

Q5: Can I use the same basket for different salt types (e.g., nitrate and chloride)?
A: Not recommended. Cross-contamination can:

• Create hazardous chemical reactions (e.g., nitrate + cyanide)
• Accelerate corrosion
  

We recommend dedicated baskets per salt type. FH® can mark baskets by salt type for clear identification.

Q6: The basket will be lifted by an overhead hoist. Do you provide lifting lugs?
A: Yes. All FH® salt bath baskets include a hanging frame or bail with reinforced lifting lugs. We need your lifting hook type and clearance height to design proper engagement.

Q7: Can I get a perforated insert for very small parts (e.g., 2 mm pins)?
A: Yes. We offer removable perforated inserts or fine mesh liners that drop into the modular basket. Perforation size from 1 mm upward. The insert is removable for cleaning and part unloading.

Q8: What is your warranty?
A: 12 months against manufacturing defects (weld cracks, material flaws, poor fit of modules). Corrosion and thermal fatigue are process-dependent and not covered – but FH® will recommend the right material for your specific salt bath to maximize life.