FIELD: rolled tube production, namely production of hot rolled and conversion large- and mean-diameter tubes of corrosion-proof hard-to-form steels and alloys, possibly in tube rolling plants with pilger mills.
SUBSTANCE: method comprises steps of turning ingots and forged blanks; drilling central opening with diameter 100 +-5 mm; heating them till yielding temperature; piercing for further rolling out in skew rolling mill to sleeves; rolling sleeves in pilger mill to hot rolled conversion tubes with lowered pilger heads and relatively thick wall at using for after-rolling pilger heads of supporting carbonaceous rings. First piercing of electroslag refining ingots and forged blanks in skew rolling mill is realized at bottom end turned forward; second piercing- rolling out is realized by means of shrinkage end turned forward. Tubes are rolled in pilger mill to sleeves at relation D/S =6.5 -8.0 with elongation degree μ ≤ 4.5. Blank is guided to pilger mill at feed value consisting of 0.4 - 0.6 of feed value of stabilized rolling process along tube length equal to path of roll away of feeding apparatus. Rolling out-after rolling of pilger head is realized in end part of sleeve 200 - 300 mm before beginning rolling out of supporting carbonaceous ring at feed value 1.1 - 1.3.
EFFECT: high quality of hot rolled conversion tubes of hard-to-form steels and alloys, lowered metal consumption of conversion "electroslag refining ingot- hot rolled tube", improved efficiency of pilger mill due to elimination of additional heating of curved sleeves, reduced cost of tubes.
3 cl, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR PRODUCING BY ELECTROLAG REFINING INGOT-BLANKS OF HARD-TO-FORM STEELS AND ALLOYS AND FOR ROLLING OF THEM COMMERCIAL TUBES OF LARGE AND MEAN DIAMETERS IN TUBE ROLLING PLANTS WITH PILGER MILLS AND CONVERSION TUBES FOR FURTHER REROLLING IN TUBE COLD ROLLING MILLS | 2006 |
|
RU2322317C2 |
| METHOD FOR PRODUCTION OF BAR-INGOTS BY ELECTROSLAG REMELT FROM ALLOYED AND LOW-ALLOYED STEEL GRADES, ROLLING OF COMMERCIAL AND CONVERSION PIPES OF LARGE AND MEDIUM DIAMETERS ON TUBE-ROLLING PLANTS WITH PILGER ROLLING MILL | 2006 |
|
RU2346765C2 |
| METHOD FOR PRODUCING INGOT-BLANKS BY ELECTROSLAG REFINING OF HARD-TO-FORM STEELS AND ALLOYS AND FOR ROLLING OF THEM COMMERCIAL TUBES OF LARGE AND MEAN DIAMETERS IN TUBE ROLLING PLANTS WITH PILGER MILLS AND CONVERSION TUBES FOR REROLLING IN TUBE COLD ROLLING MILLS | 2006 |
|
RU2322316C2 |
| METHOD FOR PRODUCING HOT ROLLED COMMERCIAL AND CONVERSION TUBES OF LARGE- AND MEAN-DIAMETERS OF HARD-TO-FORM STEELS AND ALLOYS IN TUBE ROLLING PLANTS WITH PILGER MILLS | 2005 |
|
RU2306991C2 |
| METHOD FOR PRODUCING HOT ROLLED COMMERCIAL AND CONVERSION TUBES OF LARGE AND MEAN DIAMETERS OF HARD-TO-FORM STEELS AND ALLOYS IN TUBE ROLLING PLANTS WITH PILGER MILLS | 2006 |
|
RU2311979C1 |
| METHOD FOR PRODUCING HOT ROLLED SEAMLESS TUBES FROM FORGED OR CONTINUOUSLY CAST BILLETS, ELECTROSLAG REFINING INGOTS IN TUBE ROLLING AGGREGATES WITH PILGER MILLS | 2004 |
|
RU2276625C2 |
| METHOD FOR PRODUCING HOT ROLLED COMMERCIAL AND CONVERSION TUBES WITH LARGE AND MEAN DIAMETERS FROM HARD-TO-FORM STEELS AND ALLOYS IN TUBE ROLLING PLANTS WITH PILGER MILLS | 2006 |
|
RU2311980C1 |
| MANUFACTURING METHOD OF COLD-ROLLED MARKETABLE TUBES WITH DIMENSIONS OF 150×2×1200 mm WITH INCREASED ACCURACY AS TO DIAMETER AND WALL FROM STEEL GRADE "12Х12М1БФРУ-Ш" FOR FAST NEUTRON REACTORS OF NEW GENERATION | 2013 |
|
RU2542147C1 |
| MANUFACTURING METHOD OF THREE-LAYERED HOLLOW CENTRIFUGAL CAST SECTIONS FROM DIFFICULT-TO-FORM STEEL GRADES AND ALLOYS, WHICH ARE CLADDED WITH DUCTILE CARBON STEEL GRADES, AND ROLLING FROM THEM ON PIPE ROLLING UNITS WITH PILGER MILLS OF HOT-ROLLED MECHANICALLY TREATED MERCHANTABLE AND PROCESS PIPES OF LARGE AND MEAN DIAMETERS | 2013 |
|
RU2550040C2 |
| METHOD OF CONVERSION PIPE MANUFACTURING IN PIPE ROLLING PLANTS WITH PILGER MILLS OF LOW-ELASTICITY STEEL WITH BORON CONTENT OF 1,3-1,8% | 2006 |
|
RU2334571C2 |
