Method for improving strength of S32205 series duplex stainless steel

• Main Authors: PEI MINGDE, HUO ZHENRONG, LIANG XIANGXIANG, YANG CHANGCHUN, LI GUOPING, QIN YUHANG
• Format: Patent
• Language: Chinese; English
• Published: 29.04.2022
• 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; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a method for improving the strength of S32205 series stainless steel, and belongs to the field of development and application of special stainless steel varieties. The invention discloses a method for improving the strength of S32205 series duplex stainless steel. The method comprises the following steps: step 1, selecting a strengthening element V with a proper content: adding 0.30-1.50 wt% of microalloy vanadium into S32205; 2, ferrite phase content balance is maintained, specifically, the content of Cr, the content of Ni, the content of Mo and the content of N are adjusted so that the ferrite phase proportion can be maintained between 30% and 70%; 3, hot rolling is conducted, specifically, the blooming temperature is 1080-1150 DEG C, and the rolling time is 3-6 min; and 4, annealing treatment is conducted, specifically, annealing treatment is conducted at the temperature of 1000-1100 DEG C according to the speed of 0.3-10 min/mm. By the adoption of the method, the strength of the S