AS NZS 3678-350L15Z15-Z35 normalized state structural steel plate and manufacturing method thereof

The present invention relates to an AS NZS 3678-350L15Z15-Z35 normalized state structural steel plate. Fe serves as a basic element, and the structural steel plate comprises C: 0.13-0.17%, Si: 0.10-0.50%, Mn: 1.35-1.65%, P: less than or equal to 0.015%, S: less than or equal to 0.005%, Cr: less than or equal to 0.25%, Mo: less than or equal to 0.08%, Ni: 0.10-0.30%, Cu: 0.10-0.35%, Al: 0.02-0.04%,V: 0.02-0.045%, Nb: 0.02-0.045%, Ti: 0.01-0.025%, N: less than or equal to 0.008%, and inevitable impurity elements. The carbon equivalent is 0.43-0.46%. The mark is AS/NZS 3678-350L15 (Z15-Z35). TheAS/NZS 3678-350L15 (Z15-Z35) structural steel plate with a thickness of 100 mm and a delivery state of N (normalized) can be produced through production processes of molten iron pretreatment, converter smelting, LF furnace refining, RH furnace refining, casting by a continuous casting machine, billet heating, controlled rolling, cooling, normalizing and finishing, and the like. According to the structural steel plate, the