Microalloyed bridge steel plate and normalizing rolling technology thereof

• Main Authors: GAO JUN, LI WENYI, ZHANG DAZHI, YAN BO, LIU ZHE, DING XIAOZHI, ZHANG JUN, LIU XIUYING, GAO ZHIHUI, WEN LIJUN, LIU ZETIAN, GAO ZHIGUO, DONG RUIFENG
• Format: Patent
• Language: Chinese; English
• Published: 07.11.2012
• 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 relates to a microalloyed bridge steel plate and a normalizing rolling technology thereof, and belongs to the technical field of metallurgy. The microalloyed bridge steel plate comprises, by weight, 0.15-0.20% of C, 0.30-0.45% of Si, 1.4-1.8% of Mn, P<=0.015%, S<=0.008%, 0.020-0.060% of Nb, 0.020-0.060% of V, 0.008-0.030% of Ti, 0.15-0.35% of Ni, Ce<=0.0010%, Alt >=0.025 and the balance Fe and inevitable impurities. The rolling technology includes that the heating temperature is 1200-1250 DEG C, the heating time is larger than or equal to 200 minutes, the socking time is larger than or equal to 30 minutes, the initial rough rolling temperature of normalizing rolling is 1190-1230 DEG C, the initial precision rolling temperature is 885-955 DEG C and the finishing rolling temperature is 835-875 DEG C. The microalloyed bridge steel plate and the normalizing rolling technology thereof have the advantages that the steel plate is formed by the normalizing rolling technology, steel plates with a thickne