FIELD: metallurgy.
SUBSTANCE: movable steel items are subjected to heating. Items (13, 14, 33, 34, 35) are heated with DFI-burners (6-11, 16-20) (where "DFI" is abbreviation of "direct impact of flame "), also burners are arranged to ensure one row of burners (6, 7, 8, 9, 10, 11), (16, 17, 18, 19, 20) in essence closing items along perimetre. Also, the burners are built in devices (2-4, 13) which transfer an item in the direction perpendicular to plane, where in essence the flame of burners spreads.
EFFECT: uniform item heating.
5 cl, 6 dwg
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