초록 ▼

A process for the fabrication of zirconium alloy sheet specifically intended for the manufacture of structural elements for boiling water reactors, which includes the following steps: a) producing in a vacuum an ingot having the composition of the desired alloy; b) forging and hot rolling the ingot;

A process for the fabrication of zirconium alloy sheet specifically intended for the manufacture of structural elements for boiling water reactors, which includes the following steps: a) producing in a vacuum an ingot having the composition of the desired alloy; b) forging and hot rolling the ingot; c) quenching of the blank thus obtained after reheating in the beta range; d) hot rolling after heating; e) heat treatment in the alpha range; f) at least one cycle of cold rolling followed by a heat treating in the alpha range; and g) final cold rolling followed by subcritical annealing in the alpha range; where the hot rolling of the sheet after quenching from the beta range is carried out in an initial direction, then in a direction perpendicular to the initial direction.

대표청구항 ▼

In a process for the production of zirconium alloy sheet with a thickness between 0.8 and 3.5 mm, comprising the sequence of steps: a) producing under vacuum an ingot having a composition by weight of 0.1 to 0.4% iron, 0.5 to 2% tin, 0 to 0.1% nickel, 0.05 to 0.2% chromium, optionally niobium or van

In a process for the production of zirconium alloy sheet with a thickness between 0.8 and 3.5 mm, comprising the sequence of steps: a) producing under vacuum an ingot having a composition by weight of 0.1 to 0.4% iron, 0.5 to 2% tin, 0 to 0.1% nickel, 0.05 to 0.2% chromium, optionally niobium or vanadium, and the balance zirconium and impurities; b) forging the ingot at a temperature higher than 700°C. and hot rolling at a temperature higher than 900°C., to form a blank; c) reheating the blank in the beta range and subsequently quenching to form a quenched blank; d) hot rolling the quenched blank while maintaining a temperature between 500°and 700°C., to form a hot rolled blank; e) heat treating the hot rolled blank in the alpha range to form a heat treated blank; f) at least one intermediate cycle of cold rolling the heat treated blank, followed by heat treating in the alpha range; and subsequently g) final cold rolling of the blank after said heat treating in the alpha range, followed by subcritical annealing in the alpha range; the improvement comprising carrying out the hot rolling of the quenched blank in an initial rolling direction of deformation in a proportion of between 30 and 40%, then in a direction perpendicular to the initial rolling direction in a proportion of between 30 and 70%.