METHOD OF HEATING INGOTS AND BLANKS MADE FROM TITANIUM-BASED ALLOY FOR PIERCING IN SKEW ROLLING MILLS Russian patent published in 2007 - IPC C21D1/34 B21B21/00 C22F1/00 

FIELD: pipe rolling process; heating ingots and blanks for rolling.

SUBSTANCE: for smooth heating of ingots and blanks and for production of quality sleeves, proposed method excludes drilling central hole 100±5.0 mm in diameter in ingots and blanks; ingots and blanks are placed in muffles on clean hearth of continuous heating furnace; they are placed on hearth in one row at interval of 10-15 minutes and are heated in three zone-type continuous heating furnaces to temperature of 1155-1180^°C , after which they are kept in pit for 6.0-19.0 minutes and are pierced for forming sleeves in skew rolling mill; they are heated at rate of (3.0-4.0) ^°C/min and are manipulated through angle of α=180±30^° ; manipulating to pit is performed from the third port of first zone of furnace; ingots and blanks are kept in pit for 5.0-8.0 min. In case rolling mill is stopped for 30 min and there is no place in furnace, to and fro manipulating is performed in 15.00-20.0 min through angle of α=180±30^° and in case rolling mill is stopped for more than 30 min, articles are unloaded from furnace in 15.0-20.0 min and are manipulated along furnace through angle of 180±30^°.

EFFECT: reduced consumption of expensive titanium-based alloys; low cost of process.

5 cl, 1 tbl