Continuous Annealing Lines (CAL) Silica Ceramic Hearth Roller

Designed for ultra-high surface quality requirements and rapid thermal cycling, our Fused Quartz Ceramic Hollow Rollers feature an ultra-low coefficient of thermal expansion and zero reactivity with hot metal surfaces. Made from 99.9% pure fused silica, these hollow rollers eliminate strip scratch defects caused by metallic nodulation, making them the preferred choice for premium silicon steel annealing, bright annealing, and horizontal glass tempering.

• Exceptional Thermal Shock Resistance: Near-zero thermal expansion coefficient allows the roller to withstand abrupt heating and cooling cycles without cracking, distortion, or thermal shock damage.

• 100% Anti-Pick-Up & Zero Scratching: Chemically inert fused silica prevents iron powder adhesion and oxide pick-up, ensuring pristine surface finish for high-grade electrical steels, aluminum foils, and optical glass.

• Patented Flexible Metal-to-Ceramic Joint: Equipped with engineered thermal-expansion expansion joints connecting the 42CrMo forged journals to the ceramic body, guaranteeing robust torque transmission without end-cap loosening at high temperatures.

• Lightweight & Energy Efficient: Hollow tubular structure drastically lowers rotational inertia for fast speed synchronization, while low thermal conductivity minimizes furnace heat loss.

Technical Specifications

• Body Material: High-Purity Fused Silica / Quartz Ceramic

• Shaft Journal Material: 42CrMo / 40CrNiMo Forgings (Quenched & Tempered)

• Structure: Hollow Ceramic Tube with Flexible Metal End-Caps

• Outer Diameter (OD): 100 - 800mm (Customizable)

• Barrel Length: Up to 5000mm

• Max Working Temperature: Up to 1100℃

• Surface Finish: Micro-polished / Ground (Ra 0.2-0.4um)

• Concentricity & TIR: ≤0.1mm

Primary Applications

• Non-Oriented & Grain-Oriented Silicon Steel (Electrical Steel) Annealing Lines

• Horizontal Glass Tempering Furnaces & Annealing Lehrs

• High-Precision Aluminum & Copper Alloy Foil Bright Annealing

• Electronic Ceramic & Battery Material Sintering Roller Hearth Kilns