Abstract:
PURPOSE:To provide a clad steel pipe consisting of an external pipe having high strength and an internal pipe having corrosion resistance by irradiating a laser beam to a double pipe which is slowly cooled after cladding and of which the external pipe is heat treated so as to maintain strength, thereby subjecting the surface of the internal pipe to a soln. heat treatment. CONSTITUTION:A tainless steel inside pipe 2 is superposed relatively on an external carbon steel pipe 1 and hot drawn to obtain a clad steel pipe 3 which is then heat treated by hardening and tempering to maintain the strength. The external pipe 1 is imparted with strength by such treatment. The pipe 3 is set on support rolls 6 and a motor 7 is started to rotate and advance the pipe. At the same time, a laser beam irradiation device 12 is started to radiate a laser beam 14 from a gun 13. The beam is reflected by a reflection mirror 11 to irradiate the inside surface of the internal pipe 2 of the pipe 3, thereby the inside surface is melted to undergo solution treatment. The chromium carbide deposited on the pipe 2 is eliminated and the corrosion resistance is restored and maintained.
Abstract:
A method of producing a nickel alloy clad steel pipe including: providing a hollow cylinder of nickel alloy cladding material and a hollow cylinder of steel, placing the hollow cylinder of the nickel alloy cladding material concentrically inside the hollow cylinder of steel or the hollow cylinder of the steel concentrically inside the hollow cylinder of nickel alloy cladding material to form a composite billet, heating the composite billet to 1121-1260° C., and extruding the composite billet, wherein the nickel alloy cladding material comprises 6.0-12.0 wt. % molybdenum, 19.0-27.0 wt. % chromium, 1.0 wt. % maximum tungsten, 0.6 wt. % maximum aluminum, 0.6 wt. % maximum titanium, 0.001-0.05 wt. % carbon, 0.001-0.035 wt. % nitrogen, 0.001-0.3 wt. % silicon, 1.0 wt. % maximum niobium, 2.5 wt. % maximum iron, 0.5 wt. % maximum manganese, 0.015 wt. % maximum phosphorous, 0.015 wt. % maximum sulfur, 1.0 wt. % maximum cobalt, and the balance nickel and may have a solidus temperature greater than 1312° C.
Abstract:
A pipe processing tool that is configured to deform the end of a pipe so that the circumferential shape of the end of the pipe generally matches the circumferential shape of an adjacent pipe end. Matching the circumferential shapes of the pipe ends is advantageous during a pipe attachment process. The pipe processing tool can include a deformation ring with a plurality of pipe deformation members. Each pipe deformation member faces radially inward and is actuatable in a radial direction toward and away from the center of the deformation ring in order to permit engagement with the pipe. Each pipe deformation member is individually and separately actuatable from the other pipe deformation members so that the circumferential shapes of the pipes can be altered by controlling suitable ones of the pipe deformation members.
Abstract:
Disclosed is a fluid conduit element (1), said fluid conduit element comprising a first fluid conduit member (11) and a second fluid conduit member (12), the fluid conduit members joined to each other, each fluid conduit member comprising a liner (115, 125) and a joint face (111, 121) at which the fluid conduit members are joined to each other, characterized in that the first fluid conduit member joint face (111) is convexly shaped whereby a first fluid conduit member inner wall (116) extends axially further on the joint face than a first fluid conduit member outer wall (117), the second fluid conduit member joint face (121) is concavely shaped whereby a second fluid conduit member outer wall (127) extends axially further on the joint face than a second fluid conduit member inner wall (126), wherein at least one of the first and second fluid conduit members (11, 12) comprises a buttering layer bonded to the respective fluid conduit member liner and arranged at least on one of the respective joint face and the outer wall of the respective fluid conduit member liner in an axial section abutting the respective joint face. Further disclosed is a method for producing a fluid conduit element.
Abstract:
A welding system includes an orientation sensing system associated with a welding torch and is configured to sense a welding torch orientation relative to a direction of gravity. The welding system also includes a processing system communicatively couple to the orientation sensing system and configured to determine an angular position of the welding torch relative to a pipe based at least in part on the sense welding torch orientation.
Abstract:
The present invention provides a method of production of electric resistance welded steel pipe able to stably reduce weld defects due to oxides by firing plasma and furthermore able to reduce plasma jet noise and comprises shaping steel plate 1 into a tube and electric resistance welding the abutting end faces 4 during which blowing on at least the abutting end faces 4a in the region 6 at the welding upstream side from the weld point 9 where the temperature becomes 650°C or more a reducing high temperature (pseudo) laminar plasma obtained by applying voltage to a reducing gas containing H 2 gas: 2 to 50 vol% to which is added a balance of Ar gas alone or a mixed gas of Ar gas to which N 2 gas, He gas, or both are added. At that time, it is preferable to make the applied voltage over 120V and the make the plasma blowing conditions satisfy the following formula (1). 150
Abstract:
Provided is a wire rod for an I-type oil ring, which includes right and left rail portions and a web portion connecting the rail portions, which has an oil hole or a molten through hole formed in the web portion, and which has a circumscribing circle diameter of 10 mm or less in its transverse contour. The molten through hole has such a remolten portion formed on its exit side as encloses the exit of the molten through hole. The remolten portion exceeds such a molten portion in the transverse section along the center of the molten through hole as is formed in the molten through hole, and is formed to have 200 µm or less from the outer circumference of the molten through hole and 100 µm or less in the depth direction of the molten through hole.