Process for manufacturing clad metal tubing
AssigneeSumitomo Metal Industries, Ltd.
InventorsYoshihisa Ohashi, Mutsuo Nakanishi, Shigeharu Takai, Junichi Kikuchi, Tadashi Fukuda, Nobushige Hiraishi
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Abstract
A process for manufacturing clad metal tubing from two different types of metals having different deformation resistances is disclosed. The process comprises preparing a combined billet having two blank pipes arranged concentrically with each other, the pipes being made of different metals, and applying hot extrusion to the billet while adjusting the heating temperature of the pipe such that a pipe of the metal having a higher deformation resistance is heated to a higher temperature.
Claims35
A process for manufacturing clad metal tubing from two different types of metals having different deformation resistances, which comprises:
- preparing a billet comprising a first pipe having a first deformation resistance and a second pipe having a second deformation resistance, the second deformation resistance being greater than the first deformation resistance, the first and second pipes being arranged concentrically with each other and the pipes being made of different metals,
- heating the billet;
- adjusting heating temperatures of the first and second pipes such that the second pipe is at a higher temperature than the first pipe;
- and
- applying hot extrusion to the billet while maintaining the heating temperatures of the first and second pipes such that the second pipe is at a higher temperature than the first pipe.
A process for manufacturing clad metal tubing from two different types of metals having different deformation resistances, which comprises:
- preparing a billet comprising a first pipe having a first deformation resistance and a second pipe having a second deformation resistance, the second deformation resistance being greater than the first deformation resistance, the first and second pipes being arranged concentrically with each other, the first pipe being prepared from a wrought metal by machining and the second pipe comprising a powder-packed layer disposed on an inner or outer surface of the first pipe,
- heating the billet;
- adjusting heating temperatures of the first and second pipes such that the second pipe is at a higher temperature than the first pipe;
- and
- applying hot extrusion to the billet while maintaining the heating temperatures of the first and second pipes such that the second pipe is at a higher temperature than the first pipe.
A process for manufacturing clad metal tubing from two different types of metals having different deformation resistances, which comprises:
- preparing a billet comprising a first pipe having a first deformation resistance and a second pipe having a second deformation resistance, the second deformation resistance being greater than the first deformation resistance, the first and second pipes being arranged concentrically with each other, the first pipe comprising a carbon steel or low alloy steel and the second pipe comprising a nickel-base alloy,
- heating the billet;
- adjusting heating temperatures of the first and second pipes such that the second pipe is at a higher temperature than the first pipe;
- and
- applying hot extrusion to the billet while maintaining the heating temperatures of the first and second pipes such that the second pipe is at a higher temperature than the first pipe.
Dependencies are inferred from the claim text.