BENT PIPE AND PROCEDURE FOR ITS FABRICATION

摘要

FIELD: machine building. ^ SUBSTANCE: steel sheet is used for fabrication of bent pipe out of base metal of high strength and impact resistance and with metal of weld seam of high resilience. The sheet is fabricated by cooling upon hot rolling at rate of cooling in the central part in the direction of sheet thickness maximum 5C/s at 700-500C; the sheet is formed as a primary pipe. The primary pipe is heated to 900-1100C and bent. Further, it is cooled to temperature maximum 300C with rate of cooling in the central part in the direction of thickness minimum 5C per second at 700-500C upon which it is tempered at 300-500C. ^ EFFECT: increased operational reliability. ^ 11 cl, 1 ex, 5 tbl, 5 dwg