Medium-Cr ultrapure ferritic stainless steel thick plate and production method thereof

• Main Authors: SUN QIWEI, FANG JIANFENG, LIU WENHUA, TAN YULIANG, CUI QINGJUN, XU XIANGDONG, BANG GUN
• Format: Patent
• Language: Chinese; English
• Published: 01.12.2023
• Subjects: ALLOYS; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; 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; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a medium-Cr ultrapure ferrite stainless steel thick plate and a production method thereof. The steel plate comprises the following chemical components: less than or equal to 0.030% of C, less than or equal to 1.00% of Si, less than or equal to 1.00% of Mn, less than or equal to 0.040% of P, less than or equal to 0.030% of S, 16.0-20.0% of Cr, less than or equal to 0.030% of N and less than or equal to 0.15% of Al. (Ti + Nb) is greater than or equal to [8 * (C + N)] and less than or equal to 0.80%. The black-skin steel coil is firstly subjected to heating and heat preservation treatment through the cover type annealing furnace and then subjected to online continuous high-temperature annealing through the hot-rolling annealing line, so that the problems that the hot-rolled black-skin steel strip is prone to brittle fracture due to the fact that the ductile-brittle transition temperature is high, and stamping cracking occurs due to insufficient annealing in subsequent stamping machining