The invention discloses a hollow
forging piece profiling
forging method of an overlong-asymmetric-
pipe-mouth-contained reactor
coolant piping. The method comprises: (1), electroslag ingots are selected preferably as steel ingots and first heating is carried out; to be specific, after peeling and
wound cleaning, the processed steel ingots are sent into a furnace and are heated to 1180 DEG C to 1220 DEG C and then heat preservation is carried out for 6 to 10 hours; after a blank is sent out of the furnace, upsetting,
punching, and external circle rolling are successively carried out; (2), second heating is carried out; to be specific, the blank is put into the furnace and is heated to 1180 to 1220 DEG C and then heat preservation is carried out for 6 to 10 hours; and after core bar drawing is carried out, the processed blank becomes a hollow blank; (3), third heating, fourth heating, and fifth heating are respectively carried out; to be specific, the blank is put into the furnace and is heated to 1020 to 1060 DEG C and heat preservation is carried out for 4 to 6 hours; and after the blank is sent out of the furnace, the core bar is inserted into the hole in the middle of the blank and segmented drawing is carried out to obtain a hollow blank with two flanges; (4), sixth heating is carried out; to be specific, the blank is placed into the furnace and is heated to 1020 to 1060 DEG C and then heat preservation is carried out for 4 to 6 hours; and after the blank is sent out of the furnace, the
pipe mouth is processed by pre-
forging treatment by means of differential-temperature forging; (5), seventh heating is carried out; to be specific, the blank is placed into the furnace and is heated to 1020 to 1060 DEG C and then heat preservation is carried out for 4 to 6 hours; and after the blank is sent out of the furnace, the inner holes of the flanges are cooled by a differential temperature process and
extrusion and finishing forging are carried out; and (6), the blank is corrected and the corrected
pipe blank is bent and moulded by a bending die.