FIELD: rolled tube production, namely preparation of centrifugally cast billets of hard-to-form steels and alloys to further hot rolling of seamless tubes in tube rolling plants having pilger and automatic mills.
SUBSTANCE: method comprises step of mechanically working, namely turning and boring of cast billets by value depending upon their wall thickness and diameters; increasing layer removed by turning as wall thickness increases and lowering such layer as diameter of cast billet increases; determining value of removed layer according to expression: Δ S = S x (K1 - K2 x D/S), where Δ S -value of removed metal layer at turning billets, mm; K1 - coefficient directly lowering from 0.0175 until 0.0165 as wall thickness increases from 30 up to 100 mm; K2 - coefficient directly increasing from 0.075 up to 0.0125 for billets with diameter 100 - 300 mm and from 0.009 until 0.013 for billets with diameter 350 - 600 mm.
EFFECT: enhanced efficiency of process due to eliminating operations for cutting off rings and for rejecting billets according to macrostructure of rings without sufficient proof, lowered metal consumption at conversion of centrifugally cast billet to hot rolled tube, lowered cost of hot rolled tubes of hard-to-form steels and alloys.
2 cl, 2 tbl
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| METHOD FOR MAKING CONVERSION CAST IRON AND TECHNICAL-GRADE TUBES FROM CENTER-DIE CAST HOLLOW BILLETS OF HARD-TO-FORM STEELS AND ALLOYS | 2002 |
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| METHOD FOR PREPARING FORGED AND CONTINUOUSLY CAST BILLETS, ELECTROSLAG REFINING INGOTS, HOLLOW-SLEEVE-BLANKS OF ELECTROSLAG REFINING FOR ROLLING BOILER TUBES AND PREPARING HOLLOW SLEEVE-BLANKS OF HARD-TO-FORM STEELS AND ALLOYS FOR ROLLING COMMERCIAL AND CONVERSION TUBES | 2005 |
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RU2306993C2 |
| METHOD FOR PRODUCING HOT ROLLED COMMERCIAL AND CONVERSION TUBES OF LARGE AND MEAN DIAMETERS OF CORROSION RESISTANT HARD-TO-FORM KINDS OF STEELS AND ALLOYS IN TUBE ROLLING PLANTS WITH PILGER MILLS | 2006 |
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RU2315673C2 |
| 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 |
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RU2311979C1 |
| PRODUCTION OF SEAMLESS COLD-FORMED OIL-WELL TUBING SIZED TO 168,3×10,6×5000-10000 mm | 2013 |
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| PRODUCTION OF SEAMLESS COLD-FORMED OIL-WELL TUBING SIZED TO 88,9×6,45×9000-10700 mm FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ-Ш" GRADE | 2012 |
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RU2527578C2 |
| 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 |
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RU2311980C1 |
| METHOD OF PRODUCING COLD-DEFORMED PIPES OF 88,9x6,45x9000-10700 mm SIZE FROM CORROSION-RESISTANT ALLOY OF "ХН30МДБ" GRADE | 2016 |
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RU2615924C1 |
