Production method of X65M-grade pipeline steel plate with thin specification and high crack arrest performance

• Main Authors: LI FULEI, KONG YA, HAN QIBIAO, WANG PENGFEI, WANG ZHENHUA, GONG PIHAI, ZHU SHIPENG, WANG XING
• Format: Patent
• Language: Chinese; English
• Published: 07.04.2020
• 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; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a production method of an X65M-grade pipeline steel plate with thin specification and high crack arrest performance. The method comprises the following steps of KR desulfurization, converter smelting, LF, RH, CCM, casting blank cutting and sizing, slow cooling for 48 h, plate blank heating, high-pressure water descaling, rolling, pre-straightening, water cooling, straightening, flaw detection, cutting, inspection, number spraying and warehousing. The cost of the alloy can be effectively reduced by about 200-400 yuan/ton by optimizing a C-increasing Mo-removing component system; based on a new component system in the invention, a new TMCP (controlled rolling and controlled cooling) production process is provided, the controlled cooling process has the characteristics of the high final cooling temperature and the low cooling speed, the control accuracy is high, the temperature uniformity of the steel plate after water cooling is good, the generation of internal stress of the steel plate