Method of manufacturing seamless pipe size 377 × 14-60 mm for steam boilers, steam pipelines and manifolds applications with high and supercritical steam parameters of ingots ESR steel grade 10H9MFB-W

摘要

1. A method for manufacturing seamless pipes of 377 mm × 14-60 for steam boilers, steam lines and sewers systems with high and supercritical steam parameters of electroslag remelting ingots steel 10H9MFB-III comprising electroslag remelting ingots smelting, machining, refacing ingots Ingots -zagotovki, drilling ingot billet center hole diameter of 100 ± 5 mm, heating the ingots, billets to plasticity temperature, their firmware in mills helical rolling sleeve for rolling the sleeves pilger mills in commodity pipe size 377 × 20-60 mm, heat treating, etching, edit, ultrasonic inspection and acceptance of a tolerance on pipe diameter + 1.25 / -1.0% and a wall thickness of 20 + / -5.0% characterized in that the tube size 377 × 14-19 mm produced from ingots, billets electroslag remelting size 565 × 100 × 1 750 ± 50 mm, which was heated to a temperature of 1200-1210 ° C, is sewn to mill helical rolling gilzy- workpiece size 580hvn.290 × 2040-2160 mm to 275 mm diameter mandrel with hood μ = 1,20 and elevation diameter 2.6-2.8%, sleeve-blank Okhla give, if necessary repaired, the sleeve-blank with cold posad reheated to a temperature of 1210-1220 ° C,-liner blank is sewn and rolled in mill helical rolling sleeve in size 600hvn.415 × 2690-2850 mm on the mandrel diameter of 400 mm stretch μ = 1,32 and elevation diameter of 3.4-3.6%, the liner is rolled on TPU 8-16 "with a steel making pilger pipe size 426 × 21 × 11800-12700 × 23 and 426 × 10150-11000 mm extracts μ = 5,52, μ = 5,07 and reducing the diameter of 29.0% and is cut process waste hot saw cutting rule to correct a six