High-density precipitated phase containing low-alloy high-strength steel plate strip and rolling process thereof

• Main Authors: QIAO TUANJIE, WANG JIAN, WANG ZHIWEN, ZHANG HUI, WANG HAIMING, KANG LIMING, QIAO LINSUO, WANG XIAOPING, ZHENG YONGCHUN, GAO ZHIGUO, CHENG DEFU
• Format: Patent
• Language: Chinese; English
• Published: 05.03.2014
• 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 high-density precipitated phase containing low-alloy high-strength steel plate strip and a rolling process thereof. The high-density precipitated phase containing low-alloy high-strength steel plate strip comprises the following chemical compositions in percentage by weight: 0.05-0.12% of C, less than or equal to 0.50% of Si, 1.20-2.00% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, greater than or equal to 0.030% of Alt, 0.060-0.080% of Nb, 0.051-0.070% of V, 0.11-0.15% of Ti, 0.24-0.44% of Mo, greater than 0.23% of Nb+V+Ti, and the balance of Fe and unavoidable impurities. A hot rolling process is implemented as follows: the heating temperature of a steel ingot is 1190-1260 DEG C, the heat preservation time is 1-5 hours, the rough rolling time is 1150-1200 DEG C, the finish rolling temperature is 950-990 DEG C, the final rolling temperature is 850-900 DEG C, the total rolling reduction of two-section rolling is greater than or equal to 80%, and the tem