고-경도 강 제품 및 그 제조 방법

• Main Authors: VIROLAINEN ESA, LIIMATAINEN TOMMI, SUIKKANEN PASI, GLADH MAGNUS, HEMMILAE MIKKO, LARSSON MAGNUS
• Format: Patent
• Language: Korean
• Published: 08.12.2021
• 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

중량 백분율로, 0.17% 내지 0.38% C, 0% 내지 0.5% Si, 0.1% 내지 0.4% Mn, 0.015% 내지 0.15% Al, 0.1% 내지 0.6% Cu, 0.2% 내지 0.8% Ni, 0.1% 내지 1% Cr, 0.01% 내지 0.3% Mo, 0% 내지 0.005% Nb, 0% 내지 0.05% Ti, 0% 내지 0.2% V, 0.0008% 내지 0.005% B, 0% 내지 0.025% P, 0.008% 이하의 S, 0.01% 이하의 N, 0% 내지 0.01% Ca, 및 나머지 Fe 및 불가피한 불순물로 이루어진 조성을 포함하는 열간-압연된 강 스트립 제품이며, 그러한 강 제품은 420 내지 580 HBW 범위의 브리넬 경도, 및 적어도 5의 부식 지수(ASTM G101-04)를 갖는다. A hot-rolled steel strip product comprising a composition consisting of, in terms of weight percentages, 0.17 % to 0.38 % C, 0 % to 0.5 % Si, 0.1 % to 0.4 % Mn, 0.015 % to 0.15 % Al, 0.1 % to 0.6 % Cu, 0.2 % to 0.8 % Ni, 0.1 % to 1 % Cr, 0.01 % to 0.3 % Mo, 0 % to 0.005 % Nb, 0 % to 0.05 % Ti, 0 % to 0.2 % V, 0.0008 % to 0.005 % B, 0 % to 0.025 % P, 0.008 % or less S, 0.01 % or less N, 0 % to 0.01 % Ca, and the remainder being Fe and inevitable impurities, wherein the steel product has a Brinell hardness in the range of 420 - 580 HBW, and a corrosion index (ASTM G101-04) of at least 5.