Heat-resistant steel tray and charging basket with honeycomb grid - ZG casting for furnace material handling - ZHILI foundry
Tray and Charging Baskets ISO 9001:2015 SSAB Hardox Authorized

Tray and Charging Baskets

Precision-cast heat-resistant steel trays and charging baskets for continuous heat treatment furnaces, carburizing lines, and sintering operations. Engineered with ZG35Cr24Ni7SiN alloy for maximum thermal fatigue resistance.

Material ZG35Cr24Ni7SiN / ZG30Cr26Ni5 / ZG40Cr25Ni12Si2
Service Temperature Up to 1050 C continuous
Compatibility Ipsen, ALD, Seco/Warwick, Aichelin, Schmetz
Certification ISO 9001:2015 Certified
30+ Years of Manufacturing
500+ Global Clients
15 Days Lead Time
NO MOQ Custom OEM/ODM
Tray and Charging Baskets – Material Specifications | ZHILI

Tray and Charging Baskets

Material Specifications & Selection Guide

Grade Standard Max Temp Key Feature Application
ZG35Cr24Ni7SiN GB/T 8492 1050 C Nitrogen-strengthened, high creep resistance Carburizing trays, heavy-load baskets
ZG40Cr25Ni20Si2 GB/T 8492 1050 C Excellent oxidation & carburization resistance Quenching trays, continuous furnace grids
ZG35Cr28Ni48 GB/T 8492 1150 C Superior high-temp load-bearing strength Sintering trays, extreme-temperature grids
ZG40Cr25Ni12Si2 GB/T 8492 1000 C Good thermal shock & cost-effective General purpose baskets, medium-load trays
ZG30Cr26Ni5 GB/T 8492 950 C Economical, moderate load capacity Light-duty baskets, low-temp charging grids
ZG35Ni35Cr26 EN 10295 1100 C Best carburization resistance, long life Deep carburizing trays, gas carburizing fixtures
Grade C (%) Cr (%) Ni (%) Si (%) Mn (%) N (%) P/S Max
ZG35Cr24Ni7SiN 0.30-0.40 23.0-26.0 6.0-8.0 1.30-2.00 0.50-1.50 0.15-0.25 0.040
ZG40Cr25Ni20Si2 0.35-0.45 24.0-27.0 19.0-22.0 1.50-2.50 0.50-1.50 0.040
ZG35Cr28Ni48 0.30-0.40 26.0-30.0 46.0-50.0 1.00-2.00 0.50-1.50 0.040
ZG40Cr25Ni12Si2 0.35-0.45 24.0-27.0 11.0-14.0 1.50-2.50 0.50-1.50 0.040
ZG30Cr26Ni5 0.25-0.35 24.0-28.0 4.0-6.0 1.00-2.00 0.50-1.50 0.040
Grade Tensile (MPa) Yield (MPa) Elong. (%) Hardness (HBW) Density Creep Strength 1000 C (MPa)
ZG35Cr24Ni7SiN 480 245 8 170-220 7.75 18
ZG40Cr25Ni20Si2 450 235 8 180-240 7.75 15
ZG35Cr28Ni48 440 220 6 180-240 8.00 25
ZG40Cr25Ni12Si2 440 220 6 180-230 7.70 12
ZG30Cr26Ni5 450 235 10 170-220 7.80 10

Selection Quick Reference

  • Continuous carburizing trays (heavy load, long cycles): ZG35Cr24Ni7SiN – nitrogen strengthened for superior creep resistance at sustained temperatures
  • Gas carburizing & deep case carburizing: ZG35Ni35Cr26 or ZG40Cr25Ni20Si2 – high Ni content resists carbon diffusion embrittlement
  • Sintering / high-temp above 1100 C: ZG35Cr28Ni48 – best high-temp load-bearing, resists sagging under weight
  • Quenching & medium-temp operations: ZG40Cr25Ni12Si2 – balanced thermal shock resistance for rapid heating/cooling
  • All grades compatible with Ipsen, ALD, Seco/Warwick, Aichelin, Schmetz furnace designs

Certifications & Authorizations

Quality you can verify. Partners you can trust.

National Invention Patent Certificate — Multi-hammer Sand Mold Casting Process — Luoyang Zhili ZL 2016 1 0056588.5
ISO 9001:2015 Quality Management System Certificate — Luoyang Zhili New Materials — GICG UK Certified IAF Accredited Valid until 2027

Custom OEM / ODM

From drawing to delivery — one-stop customization, no minimum order

01

Send Drawing

Upload your technical drawing (PDF, DWG, STEP, IGES) or share sample photos with dimensions

02

Engineering Review

Material recommendation, casting process design, DFM analysis — free quotation within 24 hours

03

Sampling & Test

Prototype production with full inspection: hardness test, spectrometer, dimensional check

04

Production & Ship

ISO 9001 certified. 15-25 days standard lead time. Global shipping with full documentation

UPLOAD DRAWING & GET QUOTE No minimum order quantity | Free quotation within 24 hours | Full technical support
Tray and Charging Baskets – FAQ

Frequently Asked Questions

1 What is the typical service life of furnace trays, and what causes tray failure?

Unlike static structural castings, furnace trays withstand repeated thermal cycling, mechanical loading, and carburizing/oxidizing atmospheres simultaneously. Typical service life varies by application:

Gas Carburizing (920 C)
12,000-18,000 hrs
Quenching Tray (850 C)
15,000-25,000 hrs
Sintering (1120 C)
6,000-10,000 hrs
Neutral Annealing
20,000-30,000 hrs

Three main failure modes:

  • Carburization embrittlement: Carbon diffusion in gas carburizing furnaces increases the tray carbon content, causing progressive embrittlement. High-Ni grades (ZG35Ni35Cr26, ZG35Cr28Ni48) resist carbon uptake 3-5x longer than standard grades.
  • Thermal fatigue cracking: Repeated heating (20-1000 C) and quenching creates surface crack networks. ZG35Cr24Ni7SiN with nitrogen strengthening reduces crack propagation by 40%.
  • Creep-induced sagging: Under sustained load at temperature, trays gradually deform. This is the primary retirement reason for sintering trays. ZG35Cr28Ni48 has 60% higher creep strength at 1100 C vs standard grades.

Design tip: Request honeycomb or slotted grid patterns instead of solid plates. Open patterns reduce thermal mass, improve gas circulation, and extend service life by 20-30%.

2 Can ZHILI manufacture trays and baskets to my furnace specifications, and what information do you need?

Yes. ZHILI produces trays and charging baskets for all major furnace brands. We can manufacture from your drawings, samples, or furnace specifications with full reverse engineering capability. Here’s what we need:

  • Dimensional specifications: Furnace model, workspace dimensions (W x H x D), grid spacing requirements, and any mechanical interference constraints.
  • Operating parameters: Maximum temperature, atmosphere type (carburizing, endothermic, ammonia, vacuum), cycle duration, and quenching method (oil, water, gas).
  • Loading conditions: Maximum part weight per tray, loading/unloading method (manual, robot, fork), and required stacking/multi-level configuration.
  • Existing tray details (if available): Photos, drawings, or the worn tray itself for 3D laser scanning and reverse engineering.
Standard Lead Time
15-20 Days
Reverse Engineering
+3-5 Days
Casting Tolerance
+/- 1.0 mm
Minimum Order
No MOQ

Typical tray dimensions we manufacture: 600×900 mm, 750×1200 mm, 900×1500 mm up to 1200×1800 mm. Custom patterns and fixture integration (posts, pins, locators) supported.

3 What design features can extend the service life of my furnace trays?

Based on 30+ years of heat treatment casting experience, we recommend these proven design optimizations that can increase tray service life by 30-60%:

  • Radius all corners: Sharp corners concentrate thermal stress. Minimum 5-8 mm internal radius reduces cracking at corners by up to 50%.
  • Taper ribs and cross-members: Wider at the base, narrower at the top — reduces mass at the hottest surface while maintaining structural strength.
  • Stress-relief slots: Strategic slot placement in high-restraint areas allows controlled thermal expansion instead of uncontrolled cracking.
  • Honeycomb vs solid grid: Open patterns improve gas circulation, reduce mass by 25-35%, and provide superior thermal shock resistance.
  • Material grade zoning: For large trays, use ZG35Cr24Ni7SiN for outer frame and ZG30Cr26Ni5 for inner grid (if temperature permits) to optimize cost.
Honeycomb Pattern
+20-30% life
Stress-Relief Slots
+15-25% life
Radiussed Corners
+30-50% life
Combined Design
+40-60% life

Send us your current tray failure pattern (photos of cracked/worn areas) and our engineering team will propose specific design improvements.

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