FH® 310S Welded Racks Fixture for Nitriding Furnace

FH® 310S Welded Fixture / Rack | For Gas & Plasma Nitriding Furnaces

Key Benefits

• Genuine 310S (UNS S31008)
  Higher chromium and nickel content than 304/309 – superior oxidation resistance and creep strength up to 650°C.
• Optimized Welding for Furnace Service
  Laser + TIG hybrid welding with minimal heat input – reduces weld sensitization and cracking risk in cyclic heating.
• Reinforced Anti-Creep Design
  FEA-optimized rib layout and gussets – minimizes sagging and distortion under load at nitriding temperatures.
• Optional Anti-Stick Coating
  FH® ceramic-based coating reduces part adhesion and slows nitride buildup on rack surfaces (extends cleaning interval).
• Custom Sizes & Configurations
  Single or multi-layer, round or square – designed to your furnace retort and part geometry.
  
  

Technical Specifications

Why FH® 310S Racks Fixtures?

1. The Right Material for Most Nitriding Jobs
310S is a proven, cost-effective choice for nitriding fixtures. It offers better high-temperature strength than 304 and resists scaling longer than 309. FH® uses only prime 310S with full traceability.

2. Welds That Last
Poor welding causes cracks and dropped parts. Our hybrid laser-TIG process produces smooth, full-penetration welds with minimal carbide precipitation – critical for thermal cycle resistance.

3. Practical Design for Real Furnace Use

• Rounded edges reduce arc risk in plasma nitriding
• Gusseted corners prevent rack twisting
• Feet or stands keep parts off the furnace floor

4. Honest Guidance
We don’t claim 310S is “immune” to nitriding – it will develop a surface nitride layer over time. But with proper cleaning (e.g., light blasting every 30–50 cycles), FH® 310S racks deliver reliable, predictable service at a fair price.

Applications

1. Gas nitriding (ammonia atmosphere)

2. Plasma / ion nitriding

3. Tempering after nitriding

3. Parts: gears, shafts, dies, molds, fasteners, valve parts

Material Grade Table:

Genuine Photos of FH® Heat Treatment Fixtures

Ordering Process

• Provide furnace ID, part dimensions, and max batch weight
• FH® team proposes a 3D layout and load calculation
• Confirm coating (standard or anti-stick)
• Production: 10–15 working days for custom sizes
• Delivery includes MTC, weld inspection photos, and first-use guide
  
  

FAQ:

Q1: How long can a 310S rack last in a nitriding furnace?
A: With regular cleaning (every 30–50 cycles), an FH® 310S rack typically lasts 80–150 cycles. 310S outperforms 304/309 but will develop a surface nitride layer over time. For extremely long life or heavy loads, consider Inconel – please consult us.

Q2: How do I clean and maintain the rack?
A: Light bead blasting (glass beads, ≤0.3 MPa) or mild pickling paste every 30–50 cycles. Do not use carbon steel brushes or heavy grinding – they damage the protective oxide layer.

Q3: Will the rack warp or sag at nitriding temperatures (600–650°C)?
A: Minimal. FH® racks feature FEA-optimized ribs and gussets. Typical creep deformation is <2 mm per 500 mm length after 100 cycles. Overloading or exceeding 650°C accelerates warping.

Q4: Do you offer an anti-nitriding coating? What does it do?
A: Yes. Our optional ceramic-based coating significantly slows nitride buildup, extending the cleaning interval to 80–100 cycles. The coating is a consumable and can be reapplied by FH®.

Q5: What is your warranty and do you provide material certificates?
A: 12 months against manufacturing defects (weld cracks, material flaws). Surface nitriding and gradual warping are normal wear – not covered. Every rack comes with a 310S mill test certificate (MTC).