Super duplex stainless steel and annealing method thereof

• Main Authors: FAN XINZHI, PEI MINGDE, HUO ZHENRONG, YANG CHANGCHUN, ZHANG FENG, LI GUOPING, QIN YUHANG
• Format: Patent
• Language: Chinese; English
• Published: 24.06.2022
• Subjects: CHEMISTRY; 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

The invention belongs to the field of development and application of super duplex stainless steel varieties, and relates to super duplex stainless steel and an annealing method thereof. The annealing method of the super duplex stainless steel comprises the following steps: controlling the heating time according to the cold rolling deformation rate, and heating the super duplex stainless steel to 750-1020 DEG C; the heat preservation time is controlled according to the cold rolling deformation rate, so that the super duplex stainless steel is subjected to heat preservation at the temperature of 1020-1100 DEG C; and cooling. According to the annealing method for the super duplex stainless steel, by combining the precipitation characteristic of a harmful phase of the super duplex stainless steel and the influence rule of cold rolling deformation on a precipitated phase, key process parameters such as annealing temperature rise, heat preservation temperature and time length of cold coils or cold plates with diffe