Casting steel strip

摘要

Continuous casting of steel strip in twin-roll caster comprising casting rolls (16). Molten steel is delivered by a delivery system comprising a distributor (18) and delivery nozzle (19) to casting pool (68) supported above the nip (69) between the casting rolls (16) which are rotated to deliver a solidified steel strip (20) downwardly from the nip. Delivery nozzle (19) dips into casting pool (68). To minimise reactions between carbon in the delivery nozzle with oxygen containing compounds in the casting pool the delivery nozzle is made of refractory material containing a major proportion of a refractory aggregate and a minor proportion of graphite of at least 96% purity in the range of 15% to 25% by weight and an anti-oxidant additive being aluminium or an alloy thereof. The refractory aggregate may be comprised mainly of alumina.