One method for producing a bimetallic tubular component comprises hot isostatic pressing an assembly comprising two concentrically-positioned tubes including an inner tube comprising a corrosion-resistant nickel alloy, and an outer tube comprising a steel alloy, thereby forming a bimetallic tubular preform. The bimetallic tubular preform is flowformed, thereby forming a bimetallic tubular component comprising an inner corrosion-resistant nickel alloy layer and an outer steel alloy layer.

A process of producing a duplex stainless steel tube comprises the steps of: a) producing an ingot or a continuous casted billet of said duplex stainless steel; b) hot extruding the ingot or the billet obtained from step a) into a tube; and c) cold rolling the tube obtained from step b) to a final dimension thereof.

The outer diameter D and the wall thickness t of the cold rolled tube is 50-250 mm respectively is 5-25 mm, and, for the cold rolling step, R and Q are set such that the following formula is satisfied:

Rp0.2target=416.53+113.26.Math.log Q+4.0479.Math.R+2694.9.Math.C %82.750.Math.(log Q).sup.20.04279.Math.R.sup.22.2601.Math.log Q.Math.R+16.9.Math.Cr %+26.1.Math.Mo %+83.6.Math.N %+Z(1)

wherein Rp0.2target is targeted yield strength and is 800-1100 MPa and 0<Q<3.6.

Method for the producing of an extruded frame element with battery pack profile for use in a bicycle frame comprising a plurality of frame elements, where the frame elements are interconnected and constitute a structure with such great rigidity that the bicycle frame under ordinary loading does not change its geometrical shape, wherein the at least one frame element is extruded with variable material thicknesses in a given cross sectional profile, and a recess is made in the at least one extruded frame element, as well as a bicycle frame comprising such a frame element, wherein a stable bicycle frame with sufficient strength is achieved, and wherein the bicycle frame becomes as discreet as possible.

A roof segment for a vehicle, particularly a motor vehicle, wherein the roof segment has a flat base element with a wall, wherein the wall is created from a single, plastically deformed starting material, forms a closed hollow cross section, and encloses one or more cavities. The invention further relates to a method for producing a roof segment that may include plastic deformation of a single starting material to produce a blank that has a wall with a closed hollow cross section, and hotforming the blank to produce the flat base element.

A metallic ingot for impact pressing includes a contact surface of the metallic ingot to contact a male mold in impact pressing having a maximum height roughness Rz of 20 m to 50 m and an average length of a roughness curve element RSm of 150 m to 400 m, the male mold being to be used in combination with a female mold in the impact pressing.

A special-purpose die for shaping an aluminum-magnesium alloy by rotating extrusion is provided, including a male die and a female die, wherein a trapezoidally-sectioned groove is formed at an end portion of a working area of the male die, an inner portion of the male die is hollow, with the hollow inner portion having sections of equal area, a circumferential wall of a die cavity of the female die is provided with at least two symmetrical axial grooves, and a cavity is formed inside a clamping part of the female die. The present disclosure remarkably reduces the axial extrusion force such that the deformation of the formed workpiece is more uniform, which greatly improves the mechanical property of the formed workpiece.

A hot extrusion die tool and a method of making the hot extrusion die tool are provided. The hot extrusion die tool includes a die tool component including a nickel-based super alloy; and a wear resistant coating deposited on the die tooling component. The method of making the hot extrusion die tool includes coating at least one portion of an extrusion die tool component comprising a nickel-based super alloy with a wear resistant coating at a high temperature; and hardening the extrusion die tool component and the at least one coated portion.

An exhaust gas recirculation (EGR) cooler having a tube, including a tube made of an aluminum alloy is installed to cool exhaust gas recirculated from an exhaust line of an internal combustion engine to an intake line of the EGR cooler. The aluminum alloy includes a predetermined weight ratio (wt %) of each of zirconium, silicon, iron, magnesium, and manganese.

An extrusion method using an extrusion press including an end platen to which a pressure ring is provided, a die, a container, a drive part for movement of the container, and a main cylinder device having an extrusion stem to form a billet into a shape includes extruding the billet loaded in the container by the extrusion stem from the die to shape it to an extruded material, releasing sealing pressure from the die, cutting the billet between the die and the container and between the die and the pressure ring by moving the die, and resuming shaping of extruded materials by the billet remaining inside the container.

There are provided: a seamless steel pipe formed from a cylindrical steel material billet through a hot isostatic extrusion step, wherein a depth of a contiguous flaw formed on an inner periphery surface and an outer periphery surface of the steel pipe is 50 m or less; a hollow spring obtained by forming a hollow body in a shape of a coil or a bar or a bar with curved part from the seamless steel pipe made of spring steel and applying a surface treatment to the hollow body so that the hollow body has compressive residual stress; and a method for producing seamless steel pipe including: a billet molding step; a first heating step; a hot isostatic extrusion step; a second heating step; an extension step; a third heating step; and a pickling step.