STRESS-CORROSION-RESISTANT HIGH-STRENGTH AND HIGH-TOUGHNESS MEDIUM CARBON STEEL AND MANUFACTURING METHOD THEREFOR

Disclosed in the present invention is stress-corrosion-resistant high-strength and high-toughness medium carbon steel. The medium carbon steel contains Fe and inevitable impurities, and further contains the following chemical elements in percentages by mass: C: 0.37-0.43%, Si: 0.10-0.40%, Mn: 0.50-0.90%, Cr: 0.60-1.25%, Ni: 1.30-2.00%, Mo: 0.15-0.30%, Al: 0.02-0.05% and Nb: 0.001-0.030%. Correspondingly, further provided in the present invention is a manufacturing method for the stress-corrosion-resistant high-strength and high-toughness medium carbon steel. The steel of the present invention has good impact toughness, elongation and surface shrinkage, also has stress corrosion cracking resistance, and has good weather resistance and fatigue resistance. La présente invention divulgue de l'acier au carbone moyen à haute résistance et haute ténacité résistant à la corrosion sous contrainte. L'acier au carbone moyen contient du Fe et des impuretés inévitables, et contient en outre les éléments chimiques suivants