Process of producing thick-walled composite metal tubing
AssigneeUsui Kokusai Sangyo Kabushiki Kaisha
InventorKeizo Sugao
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Abstract
A thick-walled composite metal tubing comprising an inner tubular member made of a steel pipe and an outer tubular member made of a carbon steel pipe which are press-fitted together with integration bonding thereof involving disappearance of the boundary interface at least in part of the inner and outer tubular members, and process for producing the same.
Claims5
A process for producing a thick-walled composite metal fuel injection tubing which comprises inserting a small diameter steel pipe into a large diameter carbon steel pipe, subjecting the pipes to drawing to reduce the diameters and press-fit inner and outer tubular members resulting therefrom, and heat treating at 1000.degree. to 1200.degree. C. for at least 2.5 minutes and not more than 20 minutes the resulting press-fitted tubing in a furnace in non-oxidizing atmosphere to effect diffusion bonding of the mating faces of said inner and outer tubular members.
Dependencies are inferred from the claim text.