Abstract: This invention pertains to a process for producing shaped components from high-strength and ultra high-strength steels with tensile strengths >780 MPa, wherein a steel sheet-metal strip is fed to a roll-forming installation and in the roll-forming installation is passed through roll stands and deformed by means of deformation rollers acting on the steel sheet, and wherein to avoid hydrogen embrittlement in plastically deformed regions of the deformed steel sheet-metal strip compressive stresses are introduced by stamping and/or upset-forging and/or overbending and bending-back or by machining the strip edges.

Abstract: A connecting member of a construction machine has an intermediate support member disposed between first and second support plates. The intermediate support member has a bottom plate formed with a draw-out hole for drawing out a casting mold and disposed facing the boom, and a cover plate continuous with the bottom plate and disposed facing the arm so as to cover the draw-out hole. A projection protruding in a draw-out direction of the casting mold is formed in at least a part of an edge facing the draw-out hole, in the bottom plate, the projection having an inner peripheral wall and an outer peripheral wall with respect to the draw-out hole.

Abstract: This invention pertains to a process for producing shaped components from high-strength and ultra high-strength steels with tensile strengths >780 MPa, wherein a steel sheet-metal strip is fed to a roll-forming installation and in the roll-forming installation is passed through roll stands and deformed by means of deformation rollers acting on the steel sheet, and wherein to avoid hydrogen embrittlement in plastically deformed regions of the deformed steel sheet-metal strip compressive stresses are introduced by stamping and/or upset-forging and/or overbending and bending-back or by machining the strip edges.

Abstract: Provided is a boom top comprising first and second support plates and an intermediate support member disposed between the first and second support plates. The intermediate support member has a bottom plate formed with a draw-out hole for a casting mold, and a cover plate covering the draw-out hole. A projection protruding in a draw-out direction of the casting mold is formed on the entire perimeter of an edge facing the draw-out hole, in the bottom plate.