长水口又称保护套管，用于钢包和中间包之间钢流的保护浇注，可以防止钢液二次氧化和从周围空气中吸收氮，同时，也避免了敞开浇注的卷渣问题。本公司生产的免烘烤型铝碳长水口具有抗热震性高，抗冲刷和抗侵蚀能力强等优点，性能达到或超过国际同类产品的先进水平。

The long nozzle is also called guard casing , beingused to shroud the casting stream between ladle andtundish , having the function of reducing reoxidationand nitrogen absorption from the ambient air andavoding slag rollcaused by open casting . The Al , O-Cbasedno baking long nozzle produced by the companyIs characterized by high thermal shock resistance , andhigh antiscour and erosiln resistance , it s performancecomes up to or surpasses advanced Oworld level .