The method consists of subjecting a coarse-grained titanium semi-product (1) with the pure titanium content of at least 99 wt % to a plastic deformation. In said plastic deformation the transverse cross-section surface area of the titanium semi-product is reduced by hydrostatic extrusion in which the titanium semi-product is the billet (1) extruded through the die (4). The reduction (R) of the transverse cross-section of the titanium billet (1) is realized in at least three but not more than five consecutive hydrostatic extrusion passes at the initial temperature of the billet (1) not above 50° C. and the extrusion velocity not above 50 cm/s. Prior to each hydrostatic extrusion pass, the titanium billet is covered with a friction-reducing agent. During the first hydrostatic extrusion pass, the reduction of the transverse cross-section surface area of the titanium semi-product is at least four, whereas during the second and third hydrostatic extrusion pass it is at least two and a half.

The present disclosure relates to methods of finishing extruded titanium alloy workpieces by generating an extruded near net shape workpiece, cooling the extruded near net shape workpiece to a cooled temperature below the beta transus temperature, and then rolling the extruded near net shape workpiece one or more times at a rolling temperature to yield a final shape workpiece with desired properties.

The present disclosure relates to methods of finishing extruded titanium alloy workpieces by generating an extruded near net shape workpiece, cooling the extruded near net shape workpiece to a cooled temperature below the beta transus temperature, and then rolling the extruded near net shape workpiece one or more times at a rolling temperature to yield a final shape workpiece with desired properties.

An extrusion press device according to the present invention includes: an extrusion unit that includes a container configured to store an extrusion material and an end platen configured to support a die-from which the extrusion material is extruded; and a control unit configured to control operation of the extrusion unit, including container sealing force that presses the container against the die. The control unit performs control to apply complementary pressure corresponding to reduced container sealing force that is increased along with progression of extrusion, to the container in a direction of the extrusion during a period from start to completion of the extrusion.

An extrusion press device according to the present invention includes: an extrusion unit that includes a container configured to store an extrusion material and an end platen configured to support a die-from which the extrusion material is extruded; and a control unit configured to control operation of the extrusion unit, including container sealing force that presses the container against the die. The control unit performs control to apply complementary pressure corresponding to reduced container sealing force that is increased along with progression of extrusion, to the container in a direction of the extrusion during a period from start to completion of the extrusion.

A lubricant includes at least 45 wt % paraffin oil, less than 8 wt % of a pyrophosphate or triphosphate, more than 6 wt % of a group 6 disulfide or diselenide and up to 27.5 wt % of graphite. The lubricant is used in a method for producing a magnesium alloy tube via extrusion, and is especially useful to form implants such as stents while maintaining the biocompatibility of the magnesium alloy.

A lubricant includes at least 45 wt % paraffin oil, less than 8 wt % of a pyrophosphate or triphosphate, more than 6 wt % of a group 6 disulfide or diselenide and up to 27.5 wt % of graphite. The lubricant is used in a method for producing a magnesium alloy tube via extrusion, and is especially useful to form implants such as stents while maintaining the biocompatibility of the magnesium alloy.

An implant, in particular an intraluminal endoprosthesis, or a semi-finished part for an implant, having a hollow cylindrical body, wherein the body includes magnesium, and the body is enriched with gallium or a gallium alloy in a region close to a surface.

An implant, in particular an intraluminal endoprosthesis, or a semi-finished part for an implant, having a hollow cylindrical body, wherein the body includes magnesium, and the body is enriched with gallium or a gallium alloy in a region close to a surface.

An extrusion forming apparatus includes a mold disposed in a front open end of an extruding channel of a housing, a holding seat disposed in front of the front open end and partially extending into the extruding channel to abut the mold, and a vibrating source connected to the housing in abutment with the holding seat and controllable to apply an ultrasonic energy to the mold through the holding seat. An extrusion forming method is carried out by the extrusion forming apparatus. An extruded product is made by the extrusion forming method using the extrusion forming apparatus.