Working principle: The molten metal flows into the graphite cavity, and the external water-cooling jacket quickly and uniformly dissipates the heat, forming a stable solidification shell. Combined with the pull-stop-push process, the rods/tubes/blank pieces are continuously pulled out. The graphite has high temperature resistance, low expansion, self-lubrication, non-sticking to copper, and high thermal conductivity, which avoids defects such as scratching, mold sticking, slag inclusion, and shrinkage cavities.
Structural composition
Graphite mold body (core): Made of high-purity isostatic pressure graphite, divided into the inlet section (hot end), shaping section, and outlet section; it can be in a monolithic form or in a segmented combined form; for rod materials, it uses graphite sleeves; for pipe materials, it uses graphite outer molds + graphite core rods.
Water-cooled copper sleeve / cooling shell: Wraps the graphite outer layer, has internal cooling water channels, ensuring uniform heat exchange and stable temperature control.
Separation ring / sealing components: Separates the steel ladle / intermediate ladle from the graphite at the inlet end, preventing leakage and oxidation.
Positioning / fastening components: Flanges, covers, heat insulation pads, ensuring coaxiality, preventing deformation, and facilitating disassembly.
Data in English
Purity: ≥99.95% (Ash content ≤0.05%)
Density: ≥1.85 g/cm³
Thermal conductivity: 120–165 W/(m·K)
CTE (Coefficient of thermal expansion): ≤2.5×10⁻⁶ /℃
Compressive strength: ≥150 MPa
Flexural strength: ≥60 MPa
Surface roughness: Ra ≤0.4–0.8 μm
Working temperature: up to 3000℃ (in inert atmosphere)
Service life (Cu rod): 7–15 days (with coating & nitrogen protection)
Dimensional tolerance: ±0.03–0.05 mm
Open porosity: ≤5%
Application industry
Copper and copper alloy processing (core business)
Oxygen-free copper rods, low-oxygen copper rods, brass rods, bronze rods, white copper rods, copper strips, copper tubes, copper profiles; used in wires and cables, motors, transformers, busbars, refrigeration copper tubes, plumbing fittings.
Wire and cable / Electrical industry: High conductivity copper rods, contact wires, copper busbars, conductor blanks.
New energy / Automotive / Rail transportation: New energy vehicle wiring copper materials, high-speed rail contact wires, connector copper alloy blanks, heat dissipation copper components.
Water heating and bathroom / Valves / Hardware: Brass rods, brass tubes, precision copper piece blanks.
Aluminum / Zinc / Lead and other non-ferrous metals: Aluminum rods, aluminum tubes, zinc alloy billets for continuous casting.
Key points for usage and factors affecting lifespan
Lifespan: Ordinary copper molds 30-60 furnaces, high purity + coating 60-120 furnaces; aluminum molds have a slightly shorter lifespan;
Factors affecting lifespan: Graphite purity/density, surface coating, casting temperature, casting speed, cooling water flow rate / water quality, mold installation concentricity, metal liquid purity;
Failure forms: Inner hole wear, hot cracking, slag dropping, oxidation, deformation; Segmented replaceable front section, cost savings
Market Characteristics
The largest user of continuous casting technology in global non-ferrous metals industry and the country with the highest import volume of graphite products;
There is almost no mid-to-low-end production capacity overseas. Southeast Asia, Japan, South Korea, Europe, and the United States purchase a large amount of Chinese graphite molds;
The products are highly standardized, have various specifications, can be customized according to drawings, have a short delivery time, and offer outstanding cost performance.
Why choose us
1. Top-quality raw materials, stable performance and longer lifespan
Using high-purity isotropic isostatic pressure graphite (imported / domestic high-quality substrate), with a purity of ≥ 99.95%, high density, fine grains, low porosity, strong thermal shock resistance, extremely low thermal expansion, no deformation at high temperatures, no copper leakage, and no mold adhesion; optional pyrolytic carbon / boron nitride coating can be selected to enhance surface hardness, oxidation resistance, and erosion resistance, with a lifespan increase of 30%–100%, reducing downtime for mold replacement and lowering overall costs.
2. Precise processing, accurate dimensions, good surface quality, high output rate
CNC precision processing + grinding and polishing, cavity surface finish Ra ≤ 0.4 μm, size tolerance ± 0.03 mm; strict control of coaxiality and straightness, no scratches, no cracks on the casting surface, good dimensional consistency, small subsequent processing allowance, and significant improvement in yield.
3. Modular customization, compatible with all models
Can be made as complete / segmented, single-flow / multi-flow, round bars, square bars, tubes, irregular shapes; compatible with various domestic / imported horizontal continuous casting machines (such as copper rods, copper tubes, copper wire); can be equipped with graphite core rods, separation rings, insulation sleeves, and one-stop supply of crystallizer assemblies.
4. Strict quality inspection, strong consistency, stable batches
Raw material testing → full inspection during processing → final inspection of size / finish / density / purity / flaw detection; full inspection upon delivery, data traceability, avoiding batch fluctuations, eliminating cracks / defects, and reducing customer scrap rate.
5. Fast delivery, favorable price, professional service
Own factory + stable supply chain, regular specifications available in stock / delivery within 7–15 days; compared to imported graphite crystallizers, the same quality has a more favorable price, faster after-sales response, and complete technical support; can provide selection, structural optimization, usage guidance, and wear repair services.
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