FIELD: rolled tube production, namely processes for making seamless hot rolled mean and large diameter tubes, possibly in tube rolling plants with pilger mills.
SUBSTANCE: method comprises steps of heating blank-ingots, piercing them in helical 777rolling mill and rolling them in pilger mill at fixed feed value lowered from beginning to end of rolling process; rolling tubes in pilger mill at feed whose value is decreased from beginning of rolling process to its end depending upon elongation factor, wall thickness, tube diameter, rolling temperature, linear expansion coefficient of steel. Feed value is determined according to expression m=k*μ*S*D*α*t* where μ - elongation factor; D - diameter of tube, mm; S - wall thickness, mm; α - linear expansion coefficient of steel, 10-6*/oC; t - current temperature value of rolling process, C; k - coefficient equal to 0.038 1/mm for tubes with diameter 273-325 mm; 0.033 for tubes with diameter 351 mm; 0.03 - for tubes with diameter 377 mm and 0.026 - for tubes with diameter 426 mm.
EFFECT: lowered lengthwise wall thickness difference of tubes, enhanced operational reliability, improved effectiveness of mill.
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| Title | Year | Author | Number |
|---|---|---|---|
| METHOD FOR MANUFACTURE OF SEAMLESS HOT ROLLED TUBES | 2002 |
|
RU2238811C2 |
| PRODUCTION METHOD OF SEAMLESS PIPES OF MAJOR AND MIDDLE DIAMETRES FOR STEAM BOILERS, STEAM PIPELINES AND COLLECTORS OF UNITS WITH HIGH AND OVERCRITICAL STEAM PARAMETERS | 2007 |
|
RU2353446C2 |
| ROLL OF PILGRIM MILL FOR ROLLING OF THIN-WALLED PIPES FROM COLD-RESISTANT AND CORROSION-RESISTANT GRADES OF STEEL | 2012 |
|
RU2516887C2 |
| PRODUCTION OF REROLLED LONG-SIZED PIPES FROM IRON-NICKEL- AND NICKEL-BASED ALLOYS AT PRU WITH PILGER MILLS | 2012 |
|
RU2523399C1 |
| PRODUCTION OF SEAMLESS HOT-ROLLED 550×25 mm PIPES AT 8-16" PRU WITH PILGER MILLS | 2012 |
|
RU2547973C2 |
| 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 273-630 MM DIAMETER 8-90 MM DEEP WALL SEAMLESS HOT-ROLLED PIPES AT PIPE ROLLING PLANT 8-16'' WITH PILGER MILLS | 2012 |
|
RU2519195C1 |
| MANUFACTURING METHOD OF SEAMLESS HOT-DEFORMED PIPES OF LARGE AND MEAN DIAMETERS ON PIPE ROLLING UNITS WITH PILGER MILLS FROM CONTINUOUSLY CAST BILLETS | 2013 |
|
RU2545962C2 |
| METHOD FOR PRODUCING LARGE- AND MEAN-DIAMETER TUBES OF COLD-RESISTANT AND CORROSION-RESISTANT STEELS IN TUBE ROLLING PLANTS WITH PILGER MILLS | 2005 |
|
RU2306992C2 |
| PRODUCTION OF BILLETS WITH OUTER AND INNER PLATING PLIES FROM CORROSION-RESISTANT STEELS AND ALLOYS FOR PRODUCTION OF SEAMLESS THREE-LAYER HOT- AND COLD-ROLLED COMMERCIAL AND REROLLED LONGER-LIFE PIPES FOR GAS AND GAS CONDENSATE EXTRACTION IN HYDROGEN SULPHIDE-BEARING MEDIA, ITS TRANSPORTATION AND GENERAL PURPOSE PIPES | 2013 |
|
RU2535151C2 |
