Continuous strip casting device comprises a pair of parallel casting rolls (3a, 3b) onto which molten metal is supplied by metal supply means (1). Casting rolls (3a, 3b) are enclosed by a casting chamber (4) into which hot strip (10) is delivered downwardly from the casting rolls. Strip (10) passes downwardly into a cooling chamber (15) where it can either fall into a moveable scrap box (17) at the bottom of chamber (15) or be guided by operation of moveable apron (14) through an exit door (20) from chamber (15) into a heat exchange chamber (19) provided with heaters (53). A pair of seal rolls (6a, 6b) are moveable in a seal chamber (5) to form a seal between chambers (4) and (15). Chambers (4), (15) and (19) are provided with respective gas inlets (24), (29) and (57) to admit oxidation inhibiting gas into those chambers. Scrap box (17) is moveable into an out of the bottom of chamber (15) via a scrap box exchange chamber (17) fitted with an airtight door (42).