High-strength bolt

Provided is a high-strength bolt having a tensile strength of 1200 MPa or more, which further has excellent ductility and delayed fracture property, and excellent impact resistance which could not be obtained before. The high-strength bolt has a tensile strength of 1.2 GPa or more, and has a threade...

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Bibliographische Detailangaben
Hauptverfasser:	KIMURA YUUJI, FUKUDA MATAICHI, INOUE TADANOBU, MURASAKI SHUJI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ALLOYS BLASTING CHEMISTRY DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS ORMACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS,CLIPS, WEDGES, JOINTS OR JOINTING ENGINEERING ELEMENTS AND UNITS FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL ENGINEERING METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS THERMAL INSULATION IN GENERAL TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS
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Beschreibung
Zusammenfassung:	Provided is a high-strength bolt having a tensile strength of 1200 MPa or more, which further has excellent ductility and delayed fracture property, and excellent impact resistance which could not be obtained before. The high-strength bolt has a tensile strength of 1.2 GPa or more, and has a threaded portion and a neck cylindrical portion. In the high-strength bolt, if the effective section area of the neck cylindrical portion having a diameter larger than that of the threaded portion is represented by Ao, the hardness of a portion at which Ao is measured is represented by Ho, the effective section area of the threaded portion is represented by As, and the hardness of the threaded portion is represented by Hs, K=(Ao * Ho)/(As * Hs) is 0.8 or more, and Ho < Hs is satisfied.