METHOD FOR MANUFACTURING NON-HEAT-TREATED SMALL SCREW

PROBLEM TO BE SOLVED: To provide a new technical means which can manufacture a non-heat-treated high strength small screw excellent in toughness and delayed cracking resistance at a low cost by saving the resources and processes. SOLUTION: To a hot-rolled steel wire rod having a chemical component c...

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Hauptverfasser:	MURAMATSU EIJIRO, TORITSUKA SHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a new technical means which can manufacture a non-heat-treated high strength small screw excellent in toughness and delayed cracking resistance at a low cost by saving the resources and processes. SOLUTION: To a hot-rolled steel wire rod having a chemical component composition by mass% of ≤0.15% C, ≤0.60% Si, 0.05-1.50% Mn, ≤0.030% P, ≤0.025% S, ≤0.060% Al and the balance Fe with inevitable impurities, a spheroidizing annealing treatment is applied and a steel wire is adjusted by reducing the diameter with cold wire-drawing or the cold wire-drawing and the other cold-plastic working, and the steel wire is forming-worked into the small screw with a cold-heading or the cold-heading and the other cold-working to manufacture the non-heat-treated high strength small screw. COPYRIGHT: (C)2009,JPO&INPIT