15CrMoR steel plate with excellent low temperature impact toughness and production method thereof

• Main Authors: LI JIE, GUAN XIUBING, GU ZIYOU, LIU LIXIAN, WANG DONGYANG, WU YANYANG, ZHAO ZIJUAN, LI YANGBING, YIN WEIJIANG, LONG JIE, WANG JIANGUO, NIU HONGXING, YUAN JINCHENG, PANG HUIYONG, HOU JINGCHAO
• Format: Patent
• Language: Chinese; English
• Published: 13.11.2020
• 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 discloses a 15CrMoR steel plate with excellent low temperature impact toughness and a production method thereof and belongs to the technical field of metallurgy. The 15CrMoR steel platecomprises the following chemical compositions in percentage by mass: 0.12-0.16% of C, 0.25-0.35% of Si, 0.45-0.60% of Mn, equal to or less than 0.015% of P, equal to or less than 0.010% of S, 0.90-1.10% of Cr, 0.5-0.6% of Mo, 0.02-0.03% of Nb, 0.02-0.04% of Al and the balance of Fe and unavoidable impurities. The production method comprises the following steps of smelting, continuous casting, heating, rolling, quenching and tempering; and quenching at a two-phase region at the quenching temperature being 840-860 DEG C. Through the two-phase region quenching and the tempering thermal treatmenttechnology, all performance indexes of the produced steel plate are obviously better than those of the steel plate produced through the normalizing and tempering technology, and the 15CrMoR steel plate has excellent impact tou