Thin high-flexibility pipeline steel plate and production method thereof

• Main Authors: TIAN PENG, ZHANG GUODONG, LI SHAOPO, WANG ZHIYONG, ZHA CHUNHE, DING WENHUA, SHEN TIEQIANG, DONG ZHANBIN, LI QUN, LI JIADING
• Format: Patent
• Language: Chinese; English
• Published: 16.04.2014
• 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 thin high-flexibility pipeline steel plate and a production method thereof, belonging to the technical field of low-carbon microalloyed steel. The steel plate comprises the following chemical components in percentage by weight: 0.05-0.10 percent of C, 0.10-0.45 percent of Si, 1.35-1.85 percent of Mn, not more than 0.020 percent of P, not more than 0.005 percent of S, 0.01-0.05 percent of Alt, 0.03-0.06 percent of Nb, 0.03-0.06 percent of V, 0.01-0.02 percent of Ti, 0.00-0.20 percent of Mo and the balance of Fe and inevitable impurity elements. The production method is mainly characterized in that a low-temperature control rolling process is adopted for replacing an accelerated cooling process: the rolling temperature in a second stage is controlled to be 800-850 DEG C, the finish rolling temperature is controlled to be 660-720 DEG C, and room temperature is reached by adopting an air natural cooling manner after rolling. The production method has the advantages that the thin high-fle