Method for improving low-temperature impact toughness of economical duplex stainless steel medium plate for nuclear power

• Main Authors: FAN XINZHI, PEI MINGDE, LIANG XIANGXIANG, YANG CHANGCHUN, LI GUOPING, QIN YUHANG
• Format: Patent
• Language: Chinese; English
• Published: 04.11.2022
• 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; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a method for improving the low-temperature impact toughness of an economical duplex stainless steel medium-thickness plate for nuclear power, belongs to the technical field of special stainless steel, and aims at improving the low-temperature impact toughness of low-Ni economical duplex stainless steel represented by S32101 under the low-temperature condition of minus 40 DEG C, especially the low-temperature impact toughness of a medium-thickness plate with the wall thickness larger than 25 mm. According to the solution, through smelting component design, rolling process parameter design and solution heat treatment process parameter design, the requirement that the transverse impact energy is larger than 27 J under the condition of-40 DEG C is met, and safe application of the steel grade in the nuclear power field is guaranteed. 本发明涉及一种提高核电用经济型双相不锈钢中厚板低温冲击韧性的方法，属于特种不锈钢技术领域，提高S32101为代表的低Ni经济型双相不锈钢在-40℃低温条件下低温冲击韧性，尤其是壁厚＞25mm中厚板低温冲击韧性，解决方案为：通过冶炼成分设计、轧制工艺参数设计以及固溶热处理工艺参数设计，满足-40℃条件下，横向冲击功＞