THREADED CONNECTION FOR PIPES AND METHOD FOR PRODUCING THREADED CONNECTION FOR PIPES

The present invention provides a threaded connection for pipes and a method for producing the threaded connection for pipes. The threaded connection for pipes includes a pin (4), a box (5) and a Zn-Ni alloy plating layer (6). The pin (4) has a pin-side contact surface (40) that includes a pin-side t...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KIMOTO, Masanari, OSHIMA, Masahiro
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS THEREFOR BLASTING CHEMISTRY ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING METALLURGY PIPES PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	The present invention provides a threaded connection for pipes and a method for producing the threaded connection for pipes. The threaded connection for pipes includes a pin (4), a box (5) and a Zn-Ni alloy plating layer (6). The pin (4) has a pin-side contact surface (40) that includes a pin-side thread part (41). The box (5) has a box-side contact surface (50) that includes a box-side thread part (51). The Zn-Ni alloy plating layer (6) is formed on at least one of the pin-side contact surface (40) and the box-side contact surface (50). The Zn-Ni alloy plating layer (6) is consisting of Zn, Ni, trace amount of Cr and impurities. The trace amount of Cr content of the Zn-Ni alloy plating layer (6) is 5.0×10 counts/sec or more in terms of Cr intensity as measured by secondary ion mass spectrometry using O2+ions as bombarding ions.