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長水口又稱保護套管，用于鋼包和中間包之間鋼流的保護澆注，可以防止鋼液二次氧化和從周圍空氣中吸收氮，同時，也避免了敞開澆注的卷渣問題。本公司生產的免烘烤型鋁碳長水口具有抗熱震性高，抗沖刷和抗侵蝕能力強等優點，性能達到或超過國際同類產品的先進水平。

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 .