STEEL BAR FOR PRESTRESSED CONCRETE AND METHOD FOR PRODUCING THE SAME

• Main Authors: TOMOYUKI YOKOTA, TETSUO SHIRAGA, SHIGERU MIZOGUCHI, EIJI YAMASHITA, HAJIME NITTA
• Format: Patent
• Language: English
• Published: 29.07.2005
• Subjects: 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

A METHOD OF MANUFACTURING A PC STEEL BAR HAVING A TENSILE STRENGTH OF 1,080 N/MM2 OR MORE AND EXCELLENT IN HIGHLY UNIFORM ELONGATION AND HIGH-TEMPERATURE CHARACTERISTICS AT A LOW YIELD RATIO, INCLUDES HARDENING STEEL AT 1,160°C TO 1,300°C AND THEN TEMPERING THE STEEL. THE STEEL CONTAINS 0.5 TO 0.7 WTOF C, 0.2 TO 2.0 WT%OF MN, AND SI AND AI WITHIN THE RANGE OF 2.0 WT% < SI + AI < 5.0 WT%