Method of manufacturing a metal structural component for a vehicle, the component being a profile with at least one portion having a U-shaped cross-section, the portion having a bottom and two lateral walls (2, 3), the portion having a longitudinal direction, a first transverse direction and a second transverse direction, so that in the U-shaped cross-section of the portion are defined: - a bottom of the portion, the bottom having a direction coinciding with the first transverse direction; - a first lateral wall and a second lateral wall of the portion, the two lateral walls (2, 3) having directions coinciding with the second transverse direction; an intermediate zone of the portion having a U-shaped cross-section, having a first determined length (l) according to the longitudinal direction, wherein the intermediate zone comprises a metal having greater ductility than a main material of the component that surrounds the intermediate zone, the method comprising the steps of: a) providing a planar blank which spans the longitudinal and the first transverse directions; b) cutting out the blank to create an opening having a first portion and wherein the first portion of the opening has a second length (It) in the first transverse direction; c) welding a patch to the blank so as to cover the opening, the patch being made of the metal having greater ductility than the material of the blank; d) stamping the assembly formed by the blank and the patch to obtain the component having the at least one portion having a U-shaped cross-section so that at least part of the bottom of the portion corresponds to the patch on said first determined length (l) and the first portion of the opening of the blank having the second length (It) in the first transverse direction extends from the first lateral wall to the second lateral wall of the at least one portion. - a bottom of the portion, the bottom having a direction coinciding with the first transverse direction; - a first lateral wall and a second lateral wall of the portion, the two lateral walls (2, 3) having directions coinciding with the second transverse direction; an intermediate zone of the portion having a U-shaped cross-section, having a first determined length (l) according to the longitudinal direction, wherein the intermediate zone comprises a metal having greater ductility than a main material of the component that surrounds the intermediate zone, the method comprising the steps of: a) providing a planar blank which spans the longitudinal and the first transverse directions; b) cutting out the blank to create an opening having a first portion and wherein the first portion of the opening has a second length (It) in the first transverse direction; c) welding a patch to the blank so as to cover the opening, the patch being made of the metal having greater ductility than the material of the blank; d) stamping the assembly formed by the blank and the patch to obtain the component having the at least one portion having a U-shaped cross-section so that at least part of the bottom of the portion corresponds to the patch on said first determined length (l) and the first portion of the opening of the blank having the second length (It) in the first transverse direction extends from the first lateral wall to the second lateral wall of the at least one portion. a) providing a planar blank which spans the longitudinal and the first transverse directions; b) cutting out the blank to create an opening having a first portion and wherein the first portion of the opening has a second length (It) in the first transverse direction; c) welding a patch to the blank so as to cover the opening, the patch being made of the metal having greater ductility than the material of the blank; d) stamping the assembly formed by the blank and the patch to obtain the component having the at least one portion having a U-shaped cross-section so that at least part of the bottom of the portion corresponds to the patch on said first determined length (l) and the first portion of the opening of the blank having the second length (It) in the first transverse direction extends from the first lateral wall to the second lateral wall of the at least one portion.