METHOD FOR QUENCHING STEEL PIPE, EQUIPMENT FOR QUENCHING STEEL PIPE, AND METHOD FOR MANUFACTURING STEEL PIPE

• Main Authors: Nagayama, Yasuhiro, Fukuda, Hiroyuki, Yamasaki, Hiroyuki, Sasaki, Shunsuke, Tachi, Ryosuke
• Format: Patent
• Language: English
• Published: 25.03.2021
• Subjects: CHEMISTRY; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS

The invention is intended to provide a method for quenching a steel pipe, equipment for quenching a steel pipe, and a method of manufacturing a steel pipe that enable a steel pipe to be conveyed at high speed. The method for quenching a steel pipe includes the steps of: conveying a steel pipe onto a rotatable supporting member using a walking-arm type revolving conveyance apparatus; and rapidly cooling the steel pipe with first spray nozzles disposed above the pipe while the steel pipe is being rotated about a pipe axis of the steel pipe on the rotatable supporting member in a state where movements of the steel pipe in a direction parallel to and in a direction perpendicular to the pipe axis are stopped.