Abstract
The production of hot-rolled sheets of high-strength and wear-resistant special structural steels by direct quenching from the rolling heat is a cost effective and energy-saving alternative to traditional production via downstream quenching the previously cut-to-length plates. Reaching the required strength and toughness parameters in combination with best flatness of the sheets requires strict compliance with the pre-set rolling and cooling conditions over the entire strip width. Using two high-strength low-alloyed steels, plant trials have been carried out to study the effect of the cooling conditions and the coiling temperature on mechanical properties, impact toughness and flatness of cut-to-length sheets made of hot-rolled strip. The results showed that by applying optimized cooling pattern and low coiling temperatures, high-strength steel sheets with outstanding mechanical properties and good flatness can be produced.
Highlights
Demands regarding lightweight construction and cost reductions as well as the competition with other construction materials have prompted increased development of new grades of steel in recent years
Using two high-strength low-alloyed steels, plant trials have been carried out to study the effect of the cooling conditions and the coiling temperature on mechanical properties, impact toughness and flatness of cut-to-length sheets made of hot-rolled strip
The results showed that by applying optimized cooling pattern and low coiling temperatures, high-strength steel sheets with outstanding mechanical properties and good flatness can be produced
Summary
Demands regarding lightweight construction and cost reductions as well as the competition with other construction materials have prompted increased development of new grades of steel in recent years. Increased strengths and improved forming, application and processing characteristics distinguish the latest steel innovations. The production of hot-rolled sheets of high-strength and wear-resistant special structural steels by direct quenching from the rolling heat is a cost effective and energy-saving alternative to traditional production via downstream quenching the previously cut-to-length plates, especially for sheet thicknesses smaller than 10 mm. The influence of rolling and cooling parameters during hot strip rolling on the microstructure development, mechanical parameters and flatness of cut-to-length sheets produced from direct-quenched strip of two types of high-strength special structural steels is described
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