METHOD FOR PRODUCING PIPE large and medium diameter for steam boilers, steam pipelines and manifolds applications with high and supercritical steam parameters of steel grade 10H9MFB-W

摘要

1. A method of producing pipes of large and middle diameters for steam boilers, steam lines and sewers systems with high and supercritical steam from steel 10H9MFB-III comprising electroslag remelting ingots smelting, machining - turning bars in billet size ingots × 1750 ± 430 25, 1750 ± 470 × 25 × 585 1750 ± 50 and 1750 ± 620 × 25 mm, drilling ingot billet diameter central opening (100 ± 5) mm, heating the ingots, billets to plasticity temperature, their insertion in transverse mill helical rolling sleeve proc ku sleeves for pilger mills in pipe diameter 273-550 mm with wall thicknesses of 10 to 75 mm and extracts, depending on the dimensions of the ingots, billets and tube sizes, heat treatment, straightening, ultrasonic inspection and acceptance of a tolerance on tube diameter 1 25 / -1.0% and a wall thickness of 20 + / -5.0%, characterized in that the product pipe size 16-60 × 273, 299 × 16-60 mm produced from ingots, billets measuring 430 × 100 × 1750 ± 25 mm on technology: heating ESR ingots, billets to plasticity temperature, ingots, billets piercing mill in helical rolling gil PS elevation diameter 4.5 and 4.7%, the rolling of sleeves in pilger mills in the pipe, heat treatment, ultrasonic inspection and acceptance trub.2. A method according to claim 1, characterized in that the tube size 273 × 299 × 10-15, and 10-15 mm are produced from ingots, billets measuring 470 × 100 × 1 750 ± 25 mm on Technology: heating billets ESR ingot to plasticity temperature, ingot-piercing mill blanks in a helical rolling in elevation of the sleeve diameter or 6.2-6.4 10,4-10,6% pilger rolling of sleeves in tube mills in the steel making tolerances on diameter and ± 1,25 column