X70-degree large deformation resisting pipeline steel plate with excellent tenacity and preparation method for pipeline steel plate

• Main Authors: XU XIAODONG, ZHANG GUODONG, LI SHAOPO, LI YONGDONG, ZHA CHUNHE, DING WENHUA, GU ZHANGFEI, JIANG ZHONGXING, LI QUN, BAI XUEJUN, LI JIADING
• Format: Patent
• Language: Chinese; English
• Published: 04.07.2012
• 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 provides an X70-degree large deformation resisting pipeline steel plate with excellent tenacity and a preparation method for the pipeline steel plate, and belongs to the technical field of low-carbon micro-alloy steel. The pipeline steel plate comprises the following chemical constituents by weight percent: 0.03 to 0.08 percent of C, 0.10 to 0.45 percent of Si, 1.40 to 1.69 percent of Mn, 0 to 0.015 percent of P, 0 to 0.005 percent of S, 0.01 to 0.06 percent of Alt, 0.01 to 0.05 percent of Nb, 0.004 to 0.014 percent of Ti, 0 to 0.008 percent of N, and 0 to 0.0002 percent of H, and further comprises one to four types of the following chemical constituents by weight percent: 0 to 0.30 percent of Mo, 0 to 0.30 percent of Ni, 0 to 0.30 percent of Cr, 0 to 0.30 percent of Cu, andFe and unavoidable impurity elements in balancing amount. The preparation method comprises the following steps: revolving furnace smelting, outside furnace refining, continuous casting, heating, controllable rolling, accelera