냉연 열처리 강판 및 그 제조 방법

• Main Authors: LIN BRIAN, PANAHI DAMON, SONG HYOJIN, CHALLA VENKATA SAI ANANTH
• Format: Patent
• Language: Korean
• Published: 21.06.2024
• 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

냉연 열처리 강판으로서, 다음의 원소들: 0.2% ≤ C ≤ 0.35%; 0.2% ≤ Mn ≤ 1.2%; 0.1% ≤ Si ≤ 0.9%; 0% ≤ Al ≤ 0.1%; 0.2% ≤ Cr ≤ 0.8%; 0.01% ≤ Nb ≤ 0.1%; 0.1% ≤ Ni ≤ 0.9%; 0.1% ≤ Mo ≤ 0.9%; 0.01% ≤ Ti ≤ 0.1%; 0% ≤ P ≤ 0.02%; 0% ≤ S ≤ 0.03%; 0% ≤ N ≤ 0.09%; 0.0001% ≤ B ≤ 0.010%; 0% ≤ V≤ 0.1%; 0% ≤ Cu ≤ 2%; 0% ≤ Ca ≤ 0.005%; 0% ≤ Ce ≤ 0.1%; 0% ≤ Mg ≤ 0.05%; 0% ≤ Zr ≤ 0.05% 로 구성되고, 잔부 조성이 철 및 가공으로 인한 불가피한 불순물로 구성되고, 상기 강의 미세조직이, 면적 백분율로, 적어도 75% 의 템퍼드 마르텐사이트, 0% 내지 10% 의 프레시 마르텐사이트, 3% 내지 20% 의 페라이트 및 0 내지 5% 의 베이나이트를 포함하는, 냉연 열처리 강판. A cold rolled and heat treated steel sheet comprising of the following elements 0.2 % ≦ C ≦ 0.35 %; 0.2 % ≦ Mn ≦ 1.2 %; 0.1% ≦ Si ≦ 0.9 %; 0% ≦ Al ≦ 0.1 %; 0.2% ≦ Cr ≦ 0.8 %; 0.01% ≦ Nb ≦ 0.1%; 0.1% ≦ Ni ≦ 0.9%; 0.1% ≦ Mo ≦ 0.9% 0.01% ≦ Ti ≦ 0.1%; 0% ≦ P ≦ 0.02%; 0% ≦ S ≦ 0.03%; 0% ≦ N ≦ 0.09%; 0.0001% ≦ B ≦ 0.010%; 0% ≦ V≦ 0.1%; 0% ≦ Cu ≦ 2%; 0% ≦ Ca≦ 0.005%; 0% ≦Ce≦ 0.1%; 0% ≦ Mg≦ 0.05%; 0% ≦ Zr≦ 0.05%; the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel comprising, by area percentage, at least 75% of tempered martensite, 0% to 10% Fresh Martensite, 3 to 20% of Ferrite and 0 to 5% Bainite.