METHOD OF HEAT TREATMENT OF STRUCTURES Russian patent published in 1999 - IPC

FIELD: heat treatment of structures made of age-hardenable alloys and operating under conditions of high and low temperatures, vibration and corrosive media, particular, treatment of soldered-welded structures having parts of maraging steel and age-hardenable nickel alloy. SUBSTANCE: the claimed method includes heating of structure for soldering or welding up to temperature of 1200 ± 10 C, holding at this temperature for 6-9 min, and cooling at cooling rate of 50-70 C/min. Further on, structure is subjected to double heating up to temperature of 860 ± 10 C, holding at this temperature for 4-5 h and cooling in the air. Then, it is treated with cold at temperature of minus 50 minus 70 C for 2-3 h and tempering at temperature of 200-250 C for 2-3 h. EFFECT: high enough mechanical characteristics of soldered-welded structure serviceable under extreme operating conditions without failure. 1 tbl