WHAT IS THE QUENCHING & TEMPERING OF THE BAR? RN RN- DURING THE HOT ROLLING, THE NON-RECRYSTALLIZATION REGION IS APPROPRIATELY CONTROLLED THROUGH LOW-TEMPERATURE ROLLING AND RAPID COOLING, MANUFACTURING HIGH-YIELD STRENGTH. RNRN - ADJUSTMENT OF STEEL PROPERTIES BASED ON FERROALLOYS ARE PERFORMED THROUGH THE CONTROLLED ROLLING, LEADING TO REDUCING COSTS. RNRN - THERE IS A GROWING TREND TOWARD USING THIS KIND OF COOLING TO MANUFACTURE STEEL PRODUCTS AS THE LEVEL OF COOLING AFFECTS CHANGES IN CONDITIONS OF STEEL STRUCTURE, HELPING ENHANCING THE STEEL STRENGTH. RNRNRNSTRENGTHSRN- EASILY AND ECONOMICALLY PRODUCE HIGH-STRENGTH STEEL PRODUCTS EVEN UNDER THE CONDITIONS OF ORDINARY STEEL BAR PROPERTIES OR LOW-CARBON STEEL PROPERTIES, WITHOUT THE ADJUSTMENT OF FERROALLOY PROSPERITIES RN - ABLE TO IMPROVE TENSILE STRENGTH AND YIELD STRENGTH BY APPLYING THE EXISTING STEEL BAR PROPERTIES RN - HAVE BETTER WELDABILITY, TOUGHNESS AND BENDABILITY, COMPARED TO OTHER HIGH-STRENGTH PRODUCTS CONTAINING FERROALLOY PROPERTIES RN - EASY TO MANAGE THE PROCESSES BECAUSE CHANGES IN COOLING CONDITIONS MAKE IT EASIER TO MANUFACTURE STEEL PRODUCTS OF VARIOUS STANDARDS RNRNWEAKNESSESRN- SERIOUS DAMAGES TO THE OXIDE FILM CREATED ON THE SURFACE CAN OCCUR DURING THE RAPID COOLING PROCESS, INCREASING A RISK OF CORROSION. RN