METHOD FOR PRODUCING PIPE SIZE VN.279 × 36 VN.346 × 40 mm made of steel grade 08X18H10T-W FOR OBJECTS OF NUCLEAR ENERGY

摘要

A method of producing pipes of vn.279 and vn.346 × 36 × 40 mm made of steel grade 08Cr18Ni10Ti-III for nuclear facilities comprising electroslag remelting ingots casting size 470 × 1800 ± 25 and 1675 ± 585 × 25 mm, the central bore in ingots hole diameter of 100 ± 5.0 mm, heating the ingots to a temperature ductility, firmware ingots measuring 470 × 100 × 1800 mm ± 25 mill helical rolling sleeve sized 500 × × vn.290 2210-2270 mm on the mandrel diameter of 275 mm , rolling the sleeves at TPU 8-16 'with pilger in steel making, hot-rolled tube size 370 × 55 × 4200-4 500 mm 259/265 mm on the mandrel with backing carbonaceous rings, firmware ingots with diameter of 585 ± 1 675 × 25 mm mill helical rolling in the sleeve-blank size 240vn 590 ×. × 1830-1890 mm on the mandrel diameter of 225 mm, heating the liner -zagotovok with cold or hot posad to plasticity temperature, firmware --rollers size liners blanks × 590 × 240vn 1830-1890 mm mill helical rolling sleeve in size × 620 × vn.365 2135-2205 mm diameter on the mandrel 350. mm, hot rolling the metal recycling pipe size 445 × 58 × 4800-5000 mm 330/336 mm on the mandrel with backing carbon rings segment technological wastes - pilger seed heads and ends of the hot saw cutting, or mechanically straightening tubes, heat treatment - austenitization, machining - refacing and bore size, respectively, and vn.279 × 36 × 40 mm vn.346 with the removal of the metal of 8-10 mm on the side with a surface roughness of the outer and inner surfaces Rne more than 10 microns, characterized in that the preforms used as electroslag remelting ingots measuring 620 × 100 × 1 750 ± 50 mm, which was heated in methodical ne