High strength steel, particularly concrete steel or raw material for wire drawing, with improved material properties and improved machinability

摘要

An elongated steel element of enhanced strength suitable for use as reinforcement for concrete or drawing feed stock has a cross section which is heterogenous in structure and strength, the cross section comprising a core, a peripheral layer and a transition region between the core and the peripheral layer, the transition region consisting essentially of higher strength, harder martensite, the peripheral layer being of lower strength than the transition region and the core being of lower strength than the peripheral layer.