Annealing method of precipitation hardening stainless steel

• Main Authors: WEI ZHENGYAN, SHI PUJI, QIAO XIAOMEI, LI XIAO, TAN GUOHUA
• Format: Patent
• Language: Chinese; English
• Published: 12.07.2022
• 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 the field of stainless steel annealing. The invention relates to an annealing method of precipitation-hardening stainless steel, which comprises the following steps: putting precipitation-hardening martensitic stainless steel into an annealing furnace of which the furnace temperature is kept at 400-450 DEG C, heating to 800 +/-10 DEG C at the speed of 80 DEG C/h, preserving heat for 4-6 hours, taking out the precipitation-hardening martensitic stainless steel from the annealing furnace, cooling to 650 +/-10 DEG C within 20 minutes, and preserving heat for 10-15 hours at 650 +/-10 DEG C; and the precipitation-hardening martensitic stainless steel is cooled to 300 DEG C at the speed of 30 DEG C/h, and the precipitation-hardening martensitic stainless steel is taken out and cooled to the room temperature in air. The method has no special requirements on the temperature, the charging amount and the like when the forged bar is fed into the furnace, can be used for stacking annealing, is co