WIRE ROD HAVING HIGH STRENGTH AND IMPACT TOUGHNESS, AND METHOD FOR MANUFACTURING THEREOF

• Main Author: LEE, HYONG JIK
• Format: Patent
• Language: English; Korean
• Published: 07.06.2016
• 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 wire rod with high strength and impact toughness and a manufacturing method thereof are provided. The wire rod with high strength and impact toughness according to the present invention comprises, by weight%: 0.05 to 0.15% of carbon (C); 0.1% or less of silicon (Si); 3.0 to 4.0% of manganese (Mn); 0.1 to 0.6 of molybdenum (Mo); 0.020% or less of phosphorus (P); 0.020% or less of sulfur (S); 0.0010 to 0.0030% of boron (B); 0.010 to 0.030% of titanium (Ti); 0.0050% or less of nitrogen (N); and the remainder including Fe and inevitable impurities, wherein a microstructure thereof includes bainite of 90 area% or more and the remainder of martensite-austenite (MA). 강도와 충격 인성이 우수한 선재 및 그 제조방법이 제공된다. 본 발명은, 중량%로, 탄소(C):0.05~0.15%, 실리콘(Si):0.1%이하, 망간(Mn):3.0~4.0%, 몰리브덴(Mo):0.1~0.6%, 인 (P):0.020%이하, 황(S):0.020%이하, 붕소(B):0.0010~0.0030%, 타이타늄(Ti): 0.010-0.030%, 질소(N):0.0050%이하, 잔부 Fe 및 불가피한 불순물을 포함하여 조성되고, 그 미세조직이 90 면적% 이상의 베이나이트와 잔부 도상 마르텐사이트(MA)로 이루어진 인장 강도와 충격 인성이 우수한 선재에 관한 것이다.