Nippon Steel Corporation

Akira Tsuto

Keishi Matsumoto

Takamitsu Takagi

Makoto Miyajima

Hiroyuki Kaitani

Sayuri Iwata

A method for producing a chemically treated alloy material is provided that suppresses a decrease in chemical treatability even in a case where chemical treatment is repeatedly performed. The method for producing a chemically treated alloy material of the present disclosure includes a chemical treatment step and a treatment solution regeneration step. In the chemical treatment step, an alloy material () is immersed in an oxalate treatment solution () containing oxalate ions and fluorine ions to perform a chemical treatment. In the treatment solution regeneration step, light is radiated to the oxalate treatment solution () during the chemical treatment and/or the oxalate treatment solution () after the chemical treatment.

Method for producing chemically treated alloy material, and chemical treatment solution regeneration apparatus used in method for producing chemically treated alloy material

A joint connection method is provided that is a method for connecting joints that are used for a hydraulic pressure test or the like to a long pipe by using a production facility which includes a conveyance system, a welding apparatus, a winding apparatus and an X-ray inspection apparatus. The joint connection method includes a step of girth welding a first joint to a front end portion of the long pipe by means of the welding apparatus, a step of inspecting a girth weld zone of the first joint by means of the X-ray inspection apparatus, a step of girth welding a second joint to a rear end portion of the long pipe by means of the welding apparatus, and a step of inspecting a girth weld zone of the second joint by means of the X-ray inspection apparatus.

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Tokyo, Japan

Akira Tsuto