CRACK ARREST STEEL PLATE FOR BCA2-GRADE CONTAINER SHIP AND MANUFACTURING METHOD FOR CRACK ARREST STEEL PLATE

• Main Authors: ZHAO, Jinbin, CHE, Majun, ZHANG, Miao, LI, Hengkun, QIU, Baowen, BO, Feihu, DENG, Yang, ZHANG, Xiaoxue
• Format: Patent
• Language: Chinese; English; French
• Published: 19.05.2022
• 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; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The present invention relates to the technical field of steel production. Disclosed is a crack arrest steel plate for a BCA2-grade container ship. The crack arrest steel plate comprises the following chemical components by mass percentage: 0.04%-0.10% of C, 1.60%-2.00% of Mn, 0.30%-0.60% of Ni, 0.005%-0.05% of Nb, 0.005%-0.02% of Ti, 0.015%-0.060% of Al, 0.01%-0.25% of Cr, 0.10%-0.35% of Cu, 0.10%-0.40% of Si, not more than 0.010% of P, not more than 0.004% of S, and the balance being Fe and other inevitable impurities. Ferrite is induced to be separated out by means of grain boundary deformation, generation of carbide at the grain boundary is suppressed, the crack initiation probability is reduced, and the crack initiation energy is increased; and coarse carbide particles between bainite strip bundles are refined, the amount of coarse carbide is reduced, the length of a crack propagation path is increased, the brittle crack propagation resistance is effectively increased, and thus the crack arrest toughness