
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.
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
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Custom OEM / ODM
From drawing to delivery — one-stop customization, no minimum order
Send Drawing
Upload your technical drawing (PDF, DWG, STEP, IGES) or share sample photos with dimensions
Engineering Review
Material recommendation, casting process design, DFM analysis — free quotation within 24 hours
Sampling & Test
Prototype production with full inspection: hardness test, spectrometer, dimensional check
Production & Ship
ISO 9001 certified. 15-25 days standard lead time. Global shipping with full documentation
Frequently Asked Questions
Unlike static structural castings, furnace trays withstand repeated thermal cycling, mechanical loading, and carburizing/oxidizing atmospheres simultaneously. Typical service life varies by application:
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%.
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.
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.
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.
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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