Major revamp ensures greater reliability and production of materials for new markets

Modernization of a 20-high reversing mill at Hyundai Bng Steel, Korea

The 20-high reversing mill at HYUNDAI BNG STEEL underwent extensive modernization by ANDRITZ Sundwig. The complete control electronics were exchanged and now reflect state-of-the-art equipment. Furthermore, the main drives were replaced and designated drive motors completely overhauled. A modular and digital control system, consisting of automatic thickness, strip shape, and strip tension controls, as well as new spray plates with nozzles is now being used.

The challenge: A leap forward in product quality, capacity, and cost efficiency

HYUNDAI BNG STEEL, one of world’s largest steel producers, approached us with a more ambitious goal in mind. The objective was the modernization of a 20-high reversing mill in order to improve production capacity and product quality, with focus on foil strips down to 50 μm strip thickness.

The requirements in short:

to achieve the shortest possible down-time
to amortize the modernization in a very short time
to have a mill that is easy to handle and requires little maintenance an increase in production output
to enhance product quality, especially strip surface, flatness, and thickness

Our solution: Engineering and design review as closed loop development

The engineering professionals at ANDRITZ Sundwig considered every process step in order to find an innovative solution. Their exact knowledge of the line and process technology as well as many years of experience enabled them to develop sophisticated solutions that would give HYUNDAI BNG STEEL a competitive advantage for years to come.

The 20-high reversing mill underwent extensive modernization by ANDRITZ Sundwig. The complete control electronics were exchanged and now reflect state-of-the-art equipment. Furthermore, the main drives were replaced and designated drive motors completely overhauled. A modular and digital control system, consisting of automatic thickness, strip shape, and strip tension controls, as well as new spray plates with nozzles is now being used.

The result: The figures speak for themselves

After modernization, the requirements mentioned above were fulfilled. On the strength of our highly experienced technical and mechanical engineering teams, the first saleable strip was rolled 10 days after completion of installation. As a result of the modernization, the tonnage increased by approximately 10%. The various types of technological control in combination with the new hydraulic screw down made it possible to achieve a minimum strip thickness of 50 μm and flatness tolerances (3 I-units).