Title

NEW DEVELOPMENTS FOR HIGH-PERFORMANCE COLD STRIP PROCESSING LINES

NEW DEVELOPMENTS FOR HIGH-PERFORMANCE COLD STRIP PROCESSING LINES

Authorship

Hartung, Hans Georg; Hunecke, Torsten; Sasse, Caesar; Fodra, Valdir

Hartung, Hans Georg

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Hunecke, Torsten

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Sasse, Caesar

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Fodra, Valdir

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DOI

10.5151/2594-5297-20623

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Abstract

Owing to certain developments, for example in the automotive industry, the demands on cold strip products have increased in many respects. Modern Continuous Annealing (CAL) and Hot-dip Galvanizing Lines (HDGL) must be able to process a broad range of materials including multi-phase steels combining high strength with good ductility. Of course while satisfying highest quality demands. The highest degree of cost-efficiency and productivity is also an essential condition. Environmental friendliness is becoming evermore important. SMS Siemag reacts to these challenges with a number of new developments. Furnace technology has undergone continuous improvement to achieve better material properties and to save energy: Through the application of Rebox® DFI systems, the design of a modern cold strip processing line can now be built in a much more compact manner. High cooling rates of up to 120 K/s/mm are achieved with the Ultra Fast Cooling system without extra hydrogen consumption. So high-strength DP and TRIP steel strips can be produced. Cooling rates of more than 1.000 K/s/mm, which are required for martensitic steel grades with yield strengths of more than 1,000 MPa, can be achieved with the water quench system by SMS Siemag. A large number of optimizations made on the air-knife system serve to increase the quality and speed of galvanizing lines and reduce the zinc consumption. An important example of these optimizations is the Demco strip stabilization system.

Owing to certain developments, for example in the automotive industry, the demands on cold strip products have increased in many respects. Modern Continuous Annealing (CAL) and Hot-dip Galvanizing Lines (HDGL) must be able to process a broad range of materials including multi-phase steels combining high strength with good ductility. Of course while satisfying highest quality demands. The highest degree of cost-efficiency and productivity is also an essential condition. Environmental friendliness is becoming evermore important. SMS Siemag reacts to these challenges with a number of new developments. Furnace technology has undergone continuous improvement to achieve better material properties and to save energy: Through the application of Rebox® DFI systems, the design of a modern cold strip processing line can now be built in a much more compact manner. High cooling rates of up to 120 K/s/mm are achieved with the Ultra Fast Cooling system without extra hydrogen consumption. So high-strength DP and TRIP steel strips can be produced. Cooling rates of more than 1.000 K/s/mm, which are required for martensitic steel grades with yield strengths of more than 1,000 MPa, can be achieved with the water quench system by SMS Siemag. A large number of optimizations made on the air-knife system serve to increase the quality and speed of galvanizing lines and reduce the zinc consumption. An important example of these optimizations is the Demco strip stabilization system.

Keywords

Strip processing lines; Continuous annealing lines; Hot-dip galvanizing lines; Furnace technology.

Strip processing lines; Continuous annealing lines; Hot-dip galvanizing lines; Furnace technology.