A MANUFACTURING METHOD OF STEEL BOLT HAVING HIGH TENSILE STRENGTH

A method for manufacturing a high-strength bolt is disclosed. The method for manufacturing a high-strength bolt comprises: a step of forming an alloy wire rod comprising 0.3-0.4 wt% of C, 0.1 wt% or less of Si, 0.4-0.6 wt% of Mn, 0.9-1.1 wt% of Cr, 0.2-0.5 wt% of Mo, 0.05-0.15 wt% of V, 0.02-0.05 wt...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	AHN, HAK GI, LEE, YOU HWAN, HAHN, HOWARD SUNG
Format:	Patent
Sprache:	eng ; kor
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 FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL THERMAL INSULATION IN GENERAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	A method for manufacturing a high-strength bolt is disclosed. The method for manufacturing a high-strength bolt comprises: a step of forming an alloy wire rod comprising 0.3-0.4 wt% of C, 0.1 wt% or less of Si, 0.4-0.6 wt% of Mn, 0.9-1.1 wt% of Cr, 0.2-0.5 wt% of Mo, 0.05-0.15 wt% of V, 0.02-0.05 wt% of Al, 0.2-0.5 wt% of Ni, 0.015 wt% or less of P, 0.015 wt% or less of S, 0.1 wt% or less of Cu, 0.01-0.05 wt% of Ti, 0.001-0.005 wt% of B, 0.005-0.020 wt% of N, 0.005 wt% or less of O, and the remainder consisting of Fe and other inevitable impurities while having an abnormal ferrite-pearlite structure into a shape of a bolt; a step of primarily and thermally treating the formed bolt within the temperature range of Ae3 + 20°C or higher and Ae3 + 120°C or lower; a step of cooling the thermally treated bolt at the cooling speed of 200°C/s or greater and 400°C/s or lower; and a step of secondarily and thermally treating the cooled bolt within the temperature range of 400°C or higher and 500°C or lower. The secondarily and thermally treated bolt has a tempered martensite structure and a carbide structure comprising one among vanadium (V), titanium (Ti), and iron (Fe).