PLUG FOR MANUFACTURING HEAT TRANSFER TUBE WITH INTERNAL GROOVE

PROBLEM TO BE SOLVED: To prolong the life of a plug for groove rolling used for manufacturing heat transfer tubes with internal grooves for deep groove type various heat exchangers. SOLUTION: The plug material is composed of cemented carbide in which the average particle size of WC is 0.4 to 0.8 μm....

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	SAITO MINORU, NAKADA ISAO, BANSHO HIDEYUKI, SAITO TAKAHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL CHEMISTRY FERROUS OR NON-FERROUS ALLOYS MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To prolong the life of a plug for groove rolling used for manufacturing heat transfer tubes with internal grooves for deep groove type various heat exchangers. SOLUTION: The plug material is composed of cemented carbide in which the average particle size of WC is 0.4 to 0.8 μm. More preferably, the cemented carbide contains a bonding phase by 18 to 28 mass % and has the average deflective strength of >=3.5 GPa.