FIELD: tube rolling industry, in particular, production of seamless hot rolled tubes of average and large diameter on equipment with pilger mills.
SUBSTANCE: method involves heating bars-ingots; piercing bars on helical rolling mill; rolling bars-ingots on pilger mill with fixed wall thickness, with rolling process being provided on pilger mill in passes having sizes reducing from initial stage to final stage depending on rolling temperature, tube diameter, and steel linear expansion coefficient; determining difference between maximal and minimal pass values from expression: Δ=Dp-Dt(1+αt), where Dp is diameter of pass by rolling table, mm; Dt is diameter of tube in cold state, mm; t is rolling temperature current value, 0C; α is steel linear expansion coefficient, 10-6 * 1/0C.
EFFECT: reduced difference in longitudinal tube wall thickness and enhanced reliability in operation of pilger mill during rolling of tubes from alloyed difficult-to-deform grades of steel and alloys.
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| Title | Year | Author | Number |
|---|---|---|---|
| SEAMLESS HOT ROLLED TUBE MANUFACTURING METHOD | 2002 |
|
RU2233720C2 |
| ROLL OF PILGRIM MILL FOR ROLLING OF THIN-WALLED PIPES FROM COLD-RESISTANT AND CORROSION-RESISTANT GRADES OF STEEL | 2012 |
|
RU2516887C2 |
| PRODUCTION OF SEAMLESS HOT-ROLLED 530 MM AND 550 MM DIAMETER PIPES AT PRU WITH PILGER MILLS FOR STEAM BOILERS, STEAM LINES AND MANIFOLDS OF UNITS OPERATING WITH HIGH AND SUPERCRITICAL PARAMETERS OF STEAM | 2013 |
|
RU2545952C2 |
| MANUFACTURING METHOD OF SEAMLESS HOT-ROLLED TUBES ON PIPE ROLLING UNITS WITH PILGER MILLS FOR STEAM BOILERS, STEAM LINES AND HEADERS OF UNITS WITH HIGH AND SUPERCRITICAL STEAM PARAMETERS | 2013 |
|
RU2545942C2 |
| PRODUCTION OF SEAMLESS COLD-RESISTANT AND NONCORROSIVE 377×9-16 AND 426×9-18 mm PIPES AT PRU 8-16 WITH PILGER MILLS WITH STRINGENT REQUIREMENTS TO CURVATURE | 2013 |
|
RU2542150C2 |
| PRODUCTION OF SEAMLESS HOT-ROLLED, SMOOTH, THREADED, BOILER-ROOM, THICK-WALL AND SPECIAL-PURPOSE PIPES 273-630 MM IN DIAMETER AT PRU WITH PILGER MILLS | 2013 |
|
RU2564505C2 |
| METHOD OF PRODUCTION OF SEAMLESS HOT-ROLLED LARGE- AND MEDIUM-DIAMETER PIPES FROM STEEL AND ALLOYS AT PIPE ROLLING PLANTS WITH PILGRIM MILLS FROM TUBULAR BLANKS | 2012 |
|
RU2502570C1 |
| METHOD FOR ROLLING SEAMLESS HOT ROLLED CASING TUBES WITH BUTTRESS THREAD | 2005 |
|
RU2311239C2 |
| PRODUCTION OF SEAMLESS HOT-ROLLED PIPES AT PRU WITH PILGER MILLS | 2013 |
|
RU2523385C1 |
| PRU WITH PILGER MILLS FOR ROLLING OF SEAMLESS HOT-ROLLED 273-630 mm-DIA PIPES | 2013 |
|
RU2533614C1 |
