| 摘要 |
FIELD: technological processes. ^ SUBSTANCE: invention relates to metal plastic working and particularly to technology of manufacturing multilayer bellows from stainless steel 12H18N10T. Pipe billets are made of sheets with specified dimensions by a method of electric arc welding in medium of protective gases. The specified billets are assembled into a multilayer packet, which is welded at ends and is thermally treated in a protected medium, and then corrugated. Prior to corrugation the multilayer packet is heated inside and outside to the temperature that provides for preventing generation of deformational - transformation. Thermal treatment of the multilayer packet is carried out at the temperature of 1080-1100C with soaking at this temperature for 10-12 min, then this multilayer packet is cooled together with the oven to the temperature of 900C. At the same time from 900C to 500C it is cooled by means of blowing with an inert argon gas with a speed of 15C per minute. ^ EFFECT: improved efficiency of the method. ^ 3 cl, 1 ex |
