FIELD: process engineering.
SUBSTANCE: invention relates to pipe rolling. Hollow ingots-billets sized to 680×Din.×3300 mm are cast by ESR process, the inner ID Din is defined by mathematical relationships. Hollow ingots-billets are machined to billets. Billets are heated in the furnace to ductility temperature and rolled at Pilger mills at rolls with body diameter of 1150 mm. Note here that pipes with D/S≥20 ratio are rolled with grinding factor of 3.0-3.5, while pipes with D/S≤20 factor are rolled with grinding factor of 2.5-3.0. Scale from inner surface of ingots-billets is removed by blowing after their discharge from the furnace.
EFFECT: lower power and metal input and costs, higher efficiency.
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| Title | Year | Author | Number |
|---|---|---|---|
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|
RU2523394C1 |
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|
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|
RU2542053C1 |
| METHOD FOR PRODUCING IN TUBE ROLLING PLANTS WITH PILGER MILLS SEAMLESS HOT-DEFORMED ELONGATED TUBES FOR STEAM BOILERS, STEAM CONDUITS AND MANIFOLDS OF PLANTS WITH HIGH AND SUPER-CRITICAL PARAMETERS OF STEAM | 2006 |
|
RU2322315C2 |
| PRODUCTION OF 426×90 MM SEAMLESS HOT-ROLLED PIPES FOR STEAM BOILERS, STEAM PIPELINES AND MANIFOLDS OF PLANTS WITH HIGH AND SUPERHIGH STEAM PARAMETERS OF "10Х9МФБ-Ш"-GRADE STEEL AT PRU 8-16'' WITH PILGER MILLS | 2013 |
|
RU2537639C1 |
