FIELD: tube rolling.
SUBSTANCE: proposed method includes making of ingots with subsequent turning and drilling of central hole, heating of ingots to plasticity temperature, piercing in skew rolling mills into shells with fit to diameter of 8-16% and rolling on pilger mills with tolerance to wall of +20/-15%. Thickness of cut metal layer at turning of ingots is increased with increased in diameter whose value is found from expression ▵S=0.0125*D where D is diameter of ingot, mm. Diameter of central drilling of ESR ingots is found from expression ddr=do+▵(Dc-Do) where do=100 mm is value of central drilling of ingots, diameter 500 mm; ▵=0.075 is coefficient taking into account outer diameter of ingots; Dc is current of outer diameter of ingots; Do - is ingot, diameter 500 mm. Reduction of ingots at piercing is decreased with increase in diameter and is found from expression εt=εo-εt(dc-do) where εo is reduction of ingots, diameter 400 mm, equal to 16%; εt is coefficient = 0.003%/mm; dt is current diameter of ingots, mm; do is diameter of ingot, 400 mm. Rolling of tubes on pilger mill is carried out with tolerance in thickness of wall equal to +15/ - 10%.
EFFECT: reduced power consumption at piercing, reduced consumption of metal at making of boiler tube from ESR ingot, improved mechanical properties of tube metal.
4 cl, 2 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR MANUFACTURING SEAMLESS HOT-DEFORMED BOILER TUBES OF LARGE AND MEAN DIAMETERS IN TUBE ROLLING AGGREGATES WITH PILGER MILLS FOR STEAM BOILERS, STEAM CONDUITS AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERCRITICAL PARAMETERS OF STEAM FROM INGOTS OF ELECTROSLAG REFINING AND CONTINUOUSLY CAST BILLETS | 2004 |
|
RU2275977C2 |
| METHOD FOR PRODUCING IN TUBE ROLLING PLANTS WITH PILGER MILLS SEAMLESS HOT-DEFORMED LARGE- AND MEAN-DIAMETER TUBES FOR STEAM BOILERS, STEAM PIPES AND COLLECTORS OF PLANTS WITH HIGH AND SUPER-CRITICAL PARAMETERS OF STEAM FROM INGOTS OF ELECTROSLAG REFINING AND CONTINUOUSLY CAST BILLETS | 2005 |
|
RU2297891C2 |
| METHOD FOR PRODUCING IN TUBE ROLLING PLANTS WITH PILGER MILLS SEAMLESS HOT-DEFORMED LARGE- AND MEAN-DIAMETER TUBES FOR STEAM BOILERS, STEAM CONDUITS AND MANIFOLDS OF PLANTS WITH HIGH AND SUPER-CRITICAL PARAMETERS OF STEAM FROM ELECTROSLAG REFINING INGOTS OR CONTINUOUSLY CAST BILLETS | 2006 |
|
RU2322314C2 |
| METHOD OF PRODUCTION OF 325×31-60 mm SEAMLESS PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH CRITICAL AND SUPERCRITICAL STEAM PARAMETERS OF STEEL GRADE "10Х9МФБ-Ш" | 2014 |
|
RU2570150C1 |
| METHOD OF PRODUCTION OF 325×16-30 mm SEAMLESS PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH CRITICAL AND SUPERCRITICAL STEAM PARAMETERS OF STEEL GRADE "10-9¦L+-+" | 2014 |
|
RU2578060C2 |
| METHOD FOR PRODUCING IN TUBE ROLLING PLANTS WITH PILGER MILLS SEAMLESS HOT DEFORMED LARGE- AND MEAN-DIAMETER TUBES FOR STEAM BOILERS, STEAM PIPES AND COLLECTORS OF PLANTS WITH HIGH AND SUPERCRITICAL PARAMETERS OF STEAM | 2005 |
|
RU2297892C2 |
| PRODUCTION OF SEAMLESS HOT-ROLLED PIPES SIZED TO 610×28-32 mm FROM "15Х1М1Ф"- AND "10Х9МФБ-Ш"-GRADE STEELS AT PRU 8-16'' WITH PILGER MILLS FOR PIPELINES OF BOILER UNIT STEAM INTERMEDIATE OVERHEATING WITH HIGHER MECHANICAL PROPERTIES | 2012 |
|
RU2523394C1 |
| METHOD FOR PRODUCTION OF WELDLESS DRAWN PIPES WITH SIZE OF 299×10-13 mm FOR STEAM BOILERS, PIPELINES AND HEADERS OF PLANTS WITH HIGH AND SUPERCRITICAL PARAMETERS OF STEAM FROM STEEL OF GRADE OF "10Х9МФБ-Ш" | 2013 |
|
RU2547360C2 |
| METHOD OF FABRICATION OF SEAMLESS PIPES WITH SIZES 325×26-45 mm FOR BOILERS, STEAM LINES AND MANIFOLDS OF UNITS WITH HIGH AND SUPERCRITICAL STEAM PARAMETERS FROM "10Х9МФБ-Ш" BRAND STEEL | 2014 |
|
RU2564498C1 |
| METHOD OF PRODUCTION OF 325×16-25 mm SEAMLESS PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH CRITICAL AND SUPERCRITICAL STEAM PARAMETERS OF STEEL GRADE "10Х9МФБ-Ш" | 2014 |
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RU2567407C1 |
