THREADED JOINT FOR PIPE AND METHOD FOR MANUFACTURING THREADED JOINT FOR PIPE
摘要:
There is provided a threaded connection for pipe having an excellent galling resistance and an excellent appearance. A threaded connection for pipe according to the present embodiment includes a pin (3) and a box (4). The pin (3) and the box (4) have contact surfaces (34) and (44) that include thread parts (31) and (41), metal seal parts (32) and (42), and shoulder parts (33) and (43), respectively. The threaded connection for pipe includes a Zn-Ni alloy plating layer (100) on the contact surface (34) or (44) of at least one of the pin (3) and the box (4). The Zn-Ni alloy plating layer (100) contains Cu. The Cu content of the Zn-Ni alloy plating layer (100) is 4.5% by mass or less (zero excluded).
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