High-performance TMCP-state L415MB pipeline steel plate and manufacturing method thereof

• Main Authors: TAN QIN, XU DAN, PAN SHISONG, LIU JINWEN, HUANG WEITAO, YE ZHAORUI, LIU SONGLIANG, CHEN DAIQIAO
• Format: Patent
• Language: Chinese; English
• Published: 09.07.2024
• 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

The invention belongs to the technical field of pipeline steel production, and provides a high-performance TMCP-state L415MB pipeline steel plate and a manufacturing method thereof, and the pipeline steel plate comprises the following chemical components in percentage by weight: 0.05-0.09% of C, 0.15-0.35% of Si, 1.30-1.55% of Mn, less than or equal to 0.018% of P, less than or equal to 0.015% of S, less than or equal to 0.015% of P, less than or equal to 0.015% of P, less than S < = 0.007%; 0.020% to 0.060% of Alt; 0.030% to 0.040% of Nb; 0.025% to 0.045% of V; 0.010% to 0.020% of Ti; according to the L415MB pipeline steel plate, the problems that in the prior art, a TMCP-state L415MB pipeline steel plate is high in yield ratio, large in impact energy fluctuation and poor in performance qualification rate are solved, the yield ratio of the pipeline steel plate is reduced, the impact energy fluctuation is reduced, the strength and toughness of the pipeline steel plate are improved, and the performance qualifi