FIELD: rolled tube production, namely manufacture of conversion cast iron and technical-grade tubes with mean- and large-size diameters of center-die cast hollow billets of hard-to-form steels and alloys, possibly in tube rolling plants provided with pilger mills.
SUBSTANCE: method comprises steps of heating in furnaces at different rate hollow billets with diameter 300 - 650 mm until plasticity temperature; tilting them along furnace and rolling in pilger mills; holding billets with relation D/S in range 4.0≤D/S≤7.5 without tilting in tail part of furnace on grates at temperature 400 -480 C for 50 - 60 min depending upon relation D/S; heating billets up to temperature 800 -850 C at rate 1.6 - 1.8 C/min and then up to temperature 1150 -1200C at rate 2.5 - 2.7 C/min at tilting them in 15 - 20 min by angle 90 degrees ≤α≤ 180 degrees. Rolling process in pilger mill is realized with elongation factor μ≤5.0. Total period of heating center-die cast billets in heating furnaces is determined with use of relation 6.0≤th≤9.0 where th-heating time period in range 6 - 9 hours depending upon value D/S.
EFFECT: enhanced quality of tubes, lowered metal consumption, enlarged assortment of tubes of hard-to-form steels and alloys.
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