Patent ID: 8919173

Claim:
A method for making a composite hose, comprising: a first step of preparing a corrugated metal tube including a corrugated portion formed with corrugation hills and corrugation valleys, a second step of constructing an outer peripheral portion with flexibility on an outer periphery of the corrugated metal tube by forming an elastic layer on an outer periphery of the corrugated metal tube and providing a reinforcing layer on an outer periphery of the elastic layer, and a third step of plastically deforming the corrugated metal tube outwardly by exerting a deforming pressure beyond a yield point of the corrugated metal tube in an inside of the corrugated metal tube provided with the outer peripheral portion on an outer periphery thereof until the corrugation hills plastically deform; wherein the deforming pressure is applied so that the corrugation hills have Vickers hardness that is greater than Vickers hardness of the corrugation valleys.