METHOD FOR PRODUCING seamless hot machined pipe dimensions 610 × 36,53 × 36,53 × 3100-3300 mm for communication refineries with increased requirements on geometrical sizes

摘要

A method of manufacturing seamless pipes gorjachedeformirovannyh machined size 610 × 36.53 mm × 3100-3300 refineries for communication with high requirements on the geometric dimensions comprising ingots smelting hearth and electric furnaces, forging in forging ingots measuring 680 × 1 400 ± 50 mm refacing forging billet into tube size 650 ± 1 400 ± 10 × 50 mm, drilled through the center hole diameter of 100 ± 5 mm, heating billets to plasticity temperature, firmware sleeve blanks in size 390vn 660 ×. × 2000 mm a helical rolling mill on mandrel with a diameter of 375 mm hood μ = 1,41 and elevation diameter 1.5-1.6%, heating to plasticity temperature liner with cold or hot posad firmware-mill rollers of the sleeves in the helical rolling on a mandrel 500 mm diameter in size or size with the outer diameter of the rise to 1.5-3.0% stretch μ = 1,4-1,5 and rolling pipes on commodity piligimovom mill size 550 × 25 mm × 8000-8700 caliber 562 mm with a diameter tolerance + 1.25 / -1.0%, while the wall 20 + / -5.0% otlichayuschiysyatem that forging in forging ingots measuring 650 × 1630 ± 50 mm, which grind and drilling into the workpiece size 630 × 100 × 1 630 ± 50 mm, the preform is heated to plasticity temperature, is sewn in a helical rolling mill on mandrel with a diameter of 350 mm in diameter with the rise of 1.6-1.8% in the sleeve 640 365vn ×. × 2150 - 2280 mm stretch μ = 1,35-1,40, the liner is cooled after the EEPROM storage racks for workpieces to ambient temperature with rotation through ≈180 ° over 20-30 minutes, repair, heated to plasticity temperature, if necessary, is sewn - is rolled in the rolling mill on mandrel screw diameter of 485 mm in the pig-liner blank