Graphite Crucible for Aluminum Melting and Holding Furnace
Product Overview
Our graphite crucibles for aluminum melting are high-capacity refractory vessels designed to hold and melt aluminum and aluminum alloys in gas-fired, oil-fired, and electric resistance furnaces. Unlike cast iron or steel crucibles that dissolve into molten aluminum and introduce iron contamination, graphite crucibles resist aluminum wetting, do not contaminate the melt, and provide long service life at 700-800°C operating temperatures. We manufacture round, rectangular, and custom-shaped aluminum melting crucibles in capacities from 5 kg to 500 kg, with optional pouring spouts and lifting lugs.
Aluminum melting is energy-intensive and crucible life directly affects foundry operating costs. At Jincheng Graphite, we manufacture aluminum melting crucibles from dense, high-purity graphite that resists oxidation and thermal shock. Each crucible is precision-machined with thick walls and bottom to withstand repeated heating cycles and thermal expansion. We supply crucibles for die casting furnaces, holding furnaces, and melting furnaces, and can custom-make crucibles to fit your specific furnace dimensions.
Key Features
- No iron contamination - graphite does not introduce iron into aluminum melts
- Aluminum non-wetting - molten aluminum does not stick to crucible walls
- Thick wall construction - designed for long service life in production furnaces
- Thermal shock resistant - withstands repeated cold charging and hot pouring
- Wide capacity range - 5 kg small crucibles to 500 kg melting crucibles
- Optional spout - precision pouring lip for controlled metal transfer
- Lifting lugs - reinforced lugs for safe crucible handling
- Energy efficient - high thermal conductivity ensures efficient melting
Technical Specifications
| Parameter | Value |
|---|---|
| Material | High-density molded / isostatic graphite |
| Bulk Density | 1.65 - 1.80 g/cm³ |
| Operating Temperature | 700 - 850°C |
| Capacities | 5, 10, 25, 50, 100, 200, 300, 500 kg aluminum |
| Wall Thickness | 15 - 40 mm (capacity-dependent) |
| Bottom Thickness | 20 - 50 mm |
| Max Diameter | 800 mm (larger rectangular on request) |
| Max Height | 800 mm |
| Dimensional Tolerance | ±2 mm |
| Service Life | 3 - 6 months (production foundry service) |
| Shape Options | Round, rectangular, with spout, with lugs |
| Lead Time | 15-25 business days |
Applications
- Die casting furnaces - holding crucibles for aluminum die casting machines
- Melting furnaces - bulk aluminum ingot melting in gas or electric furnaces
- Aluminum recycling - melting recycled aluminum scrap and returns
- Foundry casting - sand casting and permanent mold aluminum foundries
- Aluminum billet casting - holding crucibles for continuous billet casting
- Wheel casting - low-pressure casting crucibles for aluminum wheel production
Why Choose Jincheng Graphite?
- Foundry-grade crucibles - designed for continuous production foundry use
- Custom dimensions - crucibles made to your exact furnace cavity
- Thick-wall design - longer life vs. thin-wall imported crucibles
- Cost advantage - 40-60% lower than imported silicon carbide crucibles
- Bulk supply - reliable monthly crucible supply for foundries
- Technical support - we help optimize crucible size and preheating procedure
- Fast delivery - standard sizes ship within 15-20 business days
- Global shipping - aluminum foundries in 30+ countries
FAQ
Q: How do I prepare a new graphite crucible before first use?
A: Preheat the empty crucible gradually to 300-400°C over 2-3 hours to drive out moisture, then increase to operating temperature. Do not charge cold aluminum into a hot crucible, as thermal shock can cause cracking. Gradual preheating is the single most important step for long crucible life.
Q: How long does an aluminum melting crucible last?
A: Under normal production conditions (720-760°C, daily use), a graphite aluminum melting crucible lasts 3-6 months. Life depends on furnace temperature, charging practice, alloy type, and how often the crucible is fully emptied. We recommend regular wall-thickness inspection.
Q: Can you make rectangular crucibles to fit my furnace?
A: Yes. We manufacture both round and rectangular crucibles. Send us your furnace inner dimensions and required capacity, and we will design a crucible that fits your furnace with appropriate wall and bottom thickness.
Q: What is the advantage of graphite over silicon carbide crucibles?
A: Graphite crucibles do not wet aluminum and do not contaminate the melt with silicon. They are also easier to machine custom shapes. Silicon carbide crucibles are more oxidation-resistant but can introduce silicon into the aluminum alloy. For critical alloy work, graphite is the cleaner choice.
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