EAF Roof

CHNZBTECH Advanced Water-Cooled EAF Roof Solutions

        Traditional Electric Arc Furnace (EAF) roofs typically include fully water-cooled, refractory-lined, and semi water-cooled refractory designs. However, conventional roof structures often suffer from frequent maintenance due to refractory wear, thermal deformation, and the extreme high-temperature environment.

        CHNZBTECH offers state-of-the-art EAF roof systems engineered for enhanced operational safety, significantly longer campaign life, and stable furnace performance. Our roofs are fabricated from high-quality carbon steel and alloy steel, manufactured in full compliance with GB/JB, DIN, ASTM, and other international standards to meet customer specifications.

        Backed by extensive engineering and manufacturing experience across EAF capacities from 5T to 350T, CHNZBTECH maintains rigorous quality control throughout the entire production process — from raw material inspection and welding quality assurance to stress-relief treatment, shot blasting, dimensional inspection, and protective painting.

Overcoming Traditional Limitations

        Tubular water-cooled EAF roofs have effectively addressed many drawbacks of conventional designs. Nevertheless, during normal steelmaking operations, conductive slag can splash and accumulate around the roof center and water-cooled panels. When the slag layer becomes thick enough, it may create conductive paths, leading to localized overheating, burn-through, water leakage, and unplanned production stops.

        To further enhance reliability, CHNZBTECH continuously optimizes roof designs based on real operating conditions. In a 40T EAF project, the original integral water-cooled roof was redesigned into a segmented split-type structure. After implementation, roof service life increased dramatically — from less than 1,000 heats (with frequent repairs) to more than 4,500 heats under stable operation. Additionally, hydrogen content in the molten steel was reduced by 26.7%, contributing to lower overall production costs, improved steel quality, and higher smelting efficiency.

Structural Features of CHNZBTECH Water-Cooled EAF Roof

        The CHNZBTECH water-cooled EAF roof utilizes a densely arranged tubular cooling structure for superior heat dissipation, reliable performance, and extended service life. The system mainly consists of the roof body and the fume receiving hopper.

        •The main structural framework is made of seamless steel pipes formed into a robust circular ring. These pipes provide excellent mechanical strength while serving as primary cooling water inlet and outlet channels.

        •The remaining roof area features closely spaced smaller-diameter cooling tubes, delivering highly efficient thermal protection. The modular design allows easy replacement and maintenance, with a typical service life exceeding 3,000 heats under normal conditions.

        •The lower section of the fume receiving hopper adopts water-cooled piping to enhance heat resistance.

        •Cooling water connections use flange-type stainless steel flexible hoses with rotary joints for easy installation and maintenance.

        The center section of the roof features a small refractory-lined area with three electrode ports, constructed with high-performance refractory castables to ensure excellent high-temperature resistance and operational stability.

CHNZBTECH EAF roof systems deliver reliable cooling performance, extended service life, reduced maintenance, and consistent operation — helping modern steel plants worldwide improve productivity and reduce costs.