The invention relates to an electrical transportation wire made of aluminum alloy comprising aluminum, zirconium and unavoidable impurities, characterized in that said alloy comprises at least 80 parts by weight of zirconium in the form of precipitates (Al.sub.3Zr) per 100 parts by weight of zirconium in said aluminum alloy.

An aluminum alloy wire is composed of an aluminum alloy. The aluminum alloy contains equal to or more than 0.005 mass % and equal to or less than 2.2 mass % of Fe, and a remainder of Al and an inevitable impurity. In a transverse section of the aluminum alloy wire, a surface-layer crystallization measurement region in a shape of a rectangle having a short side length of 50 m and a long side length of 75 m is defined within a surface layer region extending from a surface of the aluminum alloy wire by 50 m in a depth direction, and an average area of crystallized materials in the surface-layer crystallization measurement region is equal to or more than 0.05 m.sup.2 and equal to or less than 3 m.sup.2.

An aluminum alloy wire is composed of an aluminum alloy. The aluminum alloy contains equal to or more than 0.005 mass % and equal to or less than 2.2 mass % of Fe, and a remainder of Al and an inevitable impurity. In a transverse section of the aluminum alloy wire, a surface-layer crystallization measurement region in a shape of a rectangle having a short side length of 50 m and a long side length of 75 m is defined within a surface layer region extending from a surface of the aluminum alloy wire by 50 m in a depth direction, and an average area of crystallized materials in the surface-layer crystallization measurement region is equal to or more than 0.05 m.sup.2 and equal to or less than 3 m.sup.2.

An aluminum alloy wire is composed of an aluminum alloy. The aluminum alloy contains equal to or more than 0.005 mass % and equal to or less than 2.2 mass % of Fe, and a remainder of Al and an inevitable impurity. In a transverse section of the aluminum alloy wire, a surface-layer crystallization measurement region in a shape of a rectangle having a short side length of 50 m and a long side length of 75 m is defined within a surface layer region extending from a surface of the aluminum alloy wire by 50 m in a depth direction, and an average area of crystallized materials in the surface-layer crystallization measurement region is equal to or more than 0.05 m.sup.2 and equal to or less than 3 m.sup.2.

Subject matter of the present invention is a method of applying coating layers (9) to a substrate (1, 11, 21, 31), wherein the substrate (1, 11, 21, 31) is drawn through a coating chamber (2) containing a pressurized coating agent (3) being liquefied or softened by means of a thermal exposure, wherein the substrate (1, 11, 21, 31) is drawn through a drawing tool (8), wherein the coating agent (3) serves as a lubricant between the drawing tool (8) and a surface of the substrate (8) and wherein at the same time the coating layer (9) is applied to the surface of the substrate (8). Subject matter of the invention is also a corresponding apparatus for applying a coating layer (9) to a substrate (1, 11, 21, 31). By means of the invention coating layers can be applied to a substrate in an efficient and economical way.

A method for producing a heat transfer tube for a steam generator comprises a step of providing a tube and then applying cold drawing to the tube by using a high-pressure lubricating oil of 40 MPa or more in pressure. After the step of applying cold drawing to the tube, a step of applying a solid solution heat treatment to the tube is conducted. After the step of applying a solid solution heat treatment to the tube, a step of straightening the tube by using a roll straightening machine is conducted. An offset amount of 5 mm or less is formed for at least successive three pairs of upper and lower straightening rolls of the roll straightening machine.

A method for producing a heat transfer tube for a steam generator comprises a step of providing a tube and then applying cold drawing to the tube by using a high-pressure lubricating oil of 40 MPa or more in pressure. After the step of applying cold drawing to the tube, a step of applying a solid solution heat treatment to the tube is conducted. After the step of applying a solid solution heat treatment to the tube, a step of straightening the tube by using a roll straightening machine is conducted. An offset amount of 5 mm or less is formed for at least successive three pairs of upper and lower straightening rolls of the roll straightening machine.

The invention relates to a device (1) for drawing wire (5), comprising a plurality of cone pairs (2, 3, 4) arranged in a row and drawing dies (23, 33, 43) arranged between cones (21, 22, 31, 32, 41, 42) of a cone pair (2, 3, 4), wherein wire (5) being drawn extends from one cone pair (2, 3, 4) to the next cone pair (2, 3, 4). According to the invention, a motor (6, 7, 8) is provided for each cone pair (2, 3, 4) in order to drive said cone pair (2, 3, 4).

The invention relates to a device (1) for drawing wire (5), comprising a plurality of cone pairs (2, 3, 4) arranged in a row and drawing dies (23, 33, 43) arranged between cones (21, 22, 31, 32, 41, 42) of a cone pair (2, 3, 4), wherein wire (5) being drawn extends from one cone pair (2, 3, 4) to the next cone pair (2, 3, 4). According to the invention, a motor (6, 7, 8) is provided for each cone pair (2, 3, 4) in order to drive said cone pair (2, 3, 4).

An annealing furnace for annealing a strand of steel. The annealing furnace including a first heating apparatus for heating the strand during operation of the annealing furnace. A transport device advances the strand in a direction of transport through the annealing furnace during operation of the annealing furnace. The annealing furnace also includes a first cooling device for cooling the outer surface of the strand with a gas guide in the direction of transport behind the first heater, wherein the gas guide is arranged in such a manner that a gas flows along the outer surface of the strand during operation of the annealing furnace for cooling the strand.