Composite tube assemblies and thin-walled tubing are disclosed. In embodiments, the composite tube assemblies include a functional tube and a sacrificial tube disposed within or around the functional tube. The sacrificial tube may be removed by exposure to a corrosive media, without substantially affecting the functional tube. Methods of forming composite tube assemblies and thin-walled tubing are also described.

A threading die (100) for cold-drawing a metal wire (4) is described; the threading die comprises a hole (103) for the inlet of the wire to be drawn and the hole comprises a conical part (106) for drawing the metal wire and a truncated-cone shaped part (105) which precedes the conical part in the advance path of the metal wire and wherein no decrease in the diameter of the metal wire occurs; the base with the greater diameter (111) of the truncated-cone shaped part precedes the base with the shorter diameter (112) in the advance path of the metal wire.

A wire drawing process of a light storage wire includes a feeding step, a mixing step, a first drying step, a hot melt extrusion step, a first cooling step, a shaping/organizing wire step, a hot-temperature remodeling step, a stretching step, a second cooling step, a strand winding/rolling step, and a second drying step.

A threading die (100) for cold-drawing a metal wire (4) is described; the threading die comprises a hole (103) for the inlet of the wire to be drawn and the hole comprises a conical part (106) for drawing the metal wire and a truncated-cone shaped part (105) which precedes the conical part in the advance path of the metal wire and wherein no decrease in the diameter of the metal wire occurs; the base with the greater diameter (111) of the truncated-cone shaped part precedes the base with the shorter diameter (112) in the advance path of the metal wire.

A wire drawing process of a light storage wire includes a feeding step, a mixing step, a first drying step, a hot melt extrusion step, a first cooling step, a shaping/organizing wire step, a hot-temperature remodeling step, a stretching step, a second cooling step, a strand winding/rolling step, and a second drying step.

Provided are a high-strength bead wire and a method of manufacturing the same. The method includes preparing a wire rod containing 0.86% to 1.02% by weight of carbon, applying 5 g/m.sup.2 to 10 g/m.sup.2 of phosphate coating onto the surface of the wire rod, and drawing the wire rod onto which the phosphate coating is applied. In the drawing, the wire rod is drawn by a drawing apparatus including a drawing die capable of drawing the wire rod and a pressure die installed in front of the drawing die and capable of applying pressure to the wire rod. The diameter of the pressure die is 1.05 times to 1.20 times the diameter of the drawing die. The high-strength bead wire includes a wire rod containing 0.86% to 1.02% by weight of carbon and 5 g/m.sup.2 to 10 g/m.sup.2 of the phosphate coating applied onto the surface of the wire rod and is manufactured by the above-described method.

Composite tube assemblies and thin-walled tubing are disclosed. In embodiments, the composite tube assemblies include a functional tube and a sacrificial tube disposed within or around the functional tube. The sacrificial tube may be removed by exposure to a corrosive media, without substantially affecting the functional tube. Methods of forming composite tube assemblies and thin-walled tubing are also described.

A steel sheet is provided. The steel sheet includes a multilayer coating including at least one zinc-based layer being 0.1% to 20% magnesium by weight which is covered by a fine temporary protective layer of 5 to 100 nm. The fine temporary protective layer is composed of metal or metal oxide selected from the group consisting of aluminum, chromium, aluminum oxides AlOx, with x being strictly between 0.01 and 1.5 and chromium oxides CrOy, with y being strictly between 0.01 and 1.5. The at least one zinc-based layer is not alloyed with the temporary protective layer. Manufacturing methods for a sheet and part are also provided.

A device 10 for drawing a tubular workpiece is provided with a drawing die 20 and a drawing plug 30. The drawing die 20 includes a first curved surface section 1C from which the workpiece 40 is detached while being reduced in diameter, a die bearing section 2B arranged radially inward of and downstream of a workpiece separation point K of the first curved surface section 1C, and a guide section 2D having a second curved surface section 2C which smoothly continues to an upstream end of the die bearing section 2B and configured to again come into contact with the workpiece 40 detached from the first curved bearing section 1C to guide the workpiece to the die bearing section 2B while reducing a diameter of the workpiece 40. The drawing plug 30 has a plug bearing section 3B shorter than a length L4 of the die bearing section 2B. The plug bearing section 3B is arranged at a position corresponding to the die bearing section 2B.