HARDENED AND TEMPERED STEEL AND METHOD FOR PRODUCING PARTS OF SAID STEEL

摘要

The invention relates to a quench hardened and tempered steel with a specific composition of the following elements: 0.22% ‰¤ C ‰¤ 0.30%, 0.40% ‰¤ Mn <1.00%, 1.00% ‰¤ Cr ‰¤ 2.50%, 1.80,% ‰¤ Ni ‰¤ 4.00%, 0.30% ‰¤ Mo < 0.90% and 0.01 % ‰¤ V < 0.50%, which with a method for obtaining said steel achieves low P and S contents, contributes to increasing the mechanical strength of the steel to values greater than 1200 N/mm 2 and with high toughness, KV resilience at low temperature, -20°C, with values greater than 60 J, when a part for the manufacture of which said steel has been selected is subjected to a specific quench hardening and tempering treatment.