A method of producing a bimetallic tubular component includes providing a first tubular workpiece having an inner diameter and a second tubular workpiece having an outer diameter. The first and second tubular workpieces have dissimilar cold-working processing parameters. The method further includes diffusion bonding the inner diameter of the first tubular workpiece to the outer diameter of the second tubular workpiece, and flowforming the diffusion bonded tubular workpieces to form the bimetallic tubular component.

Provided is a corrosion resistant copper tube which can exhibit a further improved resistance to ant nest corrosion, and which is suitably usable as a heat transfer tube and refrigerant tube in air-conditioning equipment and refrigerating equipment. The copper tube is formed of a copper material comprising a copper alloy consisting of 0.15-0.50% by weight of phosphorus and the balance being copper and impurities, wherein the copper material includes phosphorus oxide particles, such that a number density of particles having a circle equivalent diameter of not less than 0.1 m among the phosphorus oxide particles is not more than 50000/mm.sup.2.

Provided is a copper alloy tube that is a drawn tube made from a CuCrZr alloy which suppresses the deterioration of mechanical strength and, in particular, the coarsening of crystal grains even in a temperature zone of a solutionizing treatment, and is thus excellent in high-temperature brazeability, as well as the manufacturing method therefor. The manufacturing method comprises a solutionizing step of heating and holding a tubular extrusion material at a solutionizing temperature of 900? C. or greater and then water-quenching the tubular extrusion material; a main process step comprising a set of steps including a drawing process step of drawing the tubular extrusion material, and an intermediate annealing step of heating at an annealing temperature and then water-quenching the drawn material; and an adjusting process step of further drawing the drawn material and setting average crystal grain sizes in a vertical cross section along an axis as well as a horizontal cross section orthogonal to the axis to 50 ?m or less each. The average crystal grain sizes of the vertical cross section and the horizontal cross section are each set to 100 ?m or greater and the annealing temperature is set to 900? C. or greater after the solutionizing step, thereby making it possible to make the average crystal grain sizes of the vertical cross section and the horizontal cross section 100 ?m or less after the adjusting process step, even if heating is performed at at least 980? C. for 30 minutes followed by air-cooling.

A tube for use in conjunction with a deep drilled hole comprises a light metal tube made of an aluminium alloy, having sections of different wall thicknesses arranged in the longitudinal direction of the tube and a respective coupling at each end for connecting the tube to a further tube, wherein the light metal tube is produced from an aluminum alloy containing the following elements: 2.5-5.0 wt. % Cu, 0.2-1.0 wt. % Mg, 0.8-2.0 wt. % Li, max. 0.15 wt. % Si, max. 0.15 wt. % Fe, max. 0.5 wt. % Mn, max. 1.0 wt. % Zn, max. 0.1 wt. % Ti, max. 0.5 wt. % Ag, the remainder being Al and unavoidable impurities. Also described is a method for producing a light metal tube for a tube of this type configured for example as a bore tube. Said method comprises the steps of forming the light metal tube by means of an extrusion method and subsequent solution annealing, then drawing out the extruded tube over the entire length thereof, until the section or sections having the smallest wall thickness are drawn out by at least 2 to 2.5%, and the drawn light metal tube is artificially aged in a subsequent process step at a temperature of between 164 C. and 180 C.

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.

An extruded multi-port tube for use in a heat exchanger comprises a main body extending longitudinally from a first end to a second end thereof. The main body is divided into a plurality of longitudinally extending segments. Each of the ports formed in the main body extend from the first end to the second end thereof for conveying a fluid therethrough. Each of the ports extend substantially parallel to the main body along each of the segments thereof. Both the main body and each of the ports of one of the segments are offset laterally relative to both the main body and each of the ports of an adjacent one of the segments.

A high-strength aluminum alloy exhibiting excellent stress corrosion cracking resistance and excellent extrudability, and a method for producing an extruded shape using the same are disclosed. The aluminum alloy includes 1.6 to 2.6 mass % of Mg, 6.0 to 7.0 mass % of Zn, 0.5 mass % or less of Cu, and 0.01 to 0.05 mass % of Ti, with the balance being Al and unavoidable impurities.

An improved apparatus and method of fabricating long nanostructured or ultrafine grained tubes includes, in one implementation, expanding and extruding a sample material through cyclic deformations. The first cycle begins with expanding the sample through a die unit by applying pressure using a punch box, then with extruding the sample by applying back pressure using a stationary mandrel, which in turn reduces the expanded sample diameter to the original diameter. The next cycle begins with inverting the die unit to further extrude the sample with no need to apply back pressure. Furthermore, resistant forces against the sample are reduced by using a lubricant material inside the die unit, thus allowing continuation of additional cycles without constraining the sample length, resulting in desired strength and elongation.

A feedstock may include at least 1 wt % of aluminum scrap composition comprising: an extrudable floated fragmentizer aluminum scrap composition, an extrudable fragmentizer aluminum scrap composition, an extrudable secondary aluminum scrap composition; or a mixture of at least two thereof. A feedstock may include at least 0.01 wt % of an alloying element composition at least partially intermixed relative to the aluminum scrap composition, the alloying element composition comprising: silicon, copper, iron, magnesium, chromium, manganese, zinc, oxygen; a rare earth element, or a mixture of at least two thereof.

A feedstock may include at least 1 wt % of an extrudable floated fragmentizer aluminum scrap composition, extrudable fragmentizer aluminum scrap composition, or an extrudable mixture thereof comprising an impurity, the impurity comprising at least one of: silicon, copper, iron magnesium, manganese, zinc or an extrudable mixture thereof; or a mixture of at least two thereof.