STEEL MATERIAL FOR SHEAR REINFORCING BAR WITH HIGH STRENGTH, AND WELD-CLOSED SHEAR REINFORCING BAR WITH HIGH STRENGTH

PROBLEM TO BE SOLVED: To provide a weld-closed shear reinforcing bar, which has high strength, high yield strength, and equivalent or rather superior characteristics of welded parts to the base material. SOLUTION: A method for manufacturing the wire rod comprises hot-rolling steel having particular...

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Bibliographic Details
Main Authors TAKAHAMA TAKESHI, TAKEI MASAMITSU, IWAMOTO TAKASHI
Format Patent
LanguageEnglish
Published 15.11.2002
Edition7
Subjects
ALLOYS
CHEMISTRY
CLADDING OR PLATING BY SOLDERING OR WELDING
CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING
FERROUS OR NON-FERROUS ALLOYS
GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS
MACHINE TOOLS
MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
METALLURGY
METALLURGY OF IRON
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
PERFORMING OPERATIONS
SOLDERING OR UNSOLDERING
TRANSPORTING
TREATMENT OF ALLOYS OR NON-FERROUS METALS
WELDING
WORKING BY LASER BEAM
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Summary:PROBLEM TO BE SOLVED: To provide a weld-closed shear reinforcing bar, which has high strength, high yield strength, and equivalent or rather superior characteristics of welded parts to the base material. SOLUTION: A method for manufacturing the wire rod comprises hot-rolling steel having particular components into a linear rod with a round or deformed shape, and cooling it at a cooling rate of 0.2-50 deg.C/sec, to give it a structure consisting mainly of fine martensite. The wire rod has tensile strength of 1420 N/mm or higher, 0.2% yield strength of 1275 N/mm or higher, and butt elongation until fracture of 5% or higher, in an as-rolled state after welding.
Bibliography:Application Number: JP20010129522