长水口 (或称保护管) 是指用于钢包与中间包之间，保护钢水不受二次氧化,防止钢流飞溅，使用前进行预热，否则在开浇时，易发生开裂、断裂等事故。它对钢种适应性强，耐侵蚀性好。目前已有不烘烤即能使用的长水口，称为事故备用水口。
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长水口砖 extended nozzle
水手长口笛 boatswain's pipe
长江口水域异甲藻 Heterocapsa circularisquama
长江取水口 changjiang water intake
长江口深水航道 Yangtze estuary deepwater channel
长江口深水外航道 Outer Navigation Channel in the Changjiang Estuary
长江口北支水道 north branch of the yangtze estuary
长江口深水航道回淤 back silting of Yangtze Estuary Deepwater Channel
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长水口颈部应力过大是其颈部开裂的主要原因。
Too high stress in the neck of long nozzle is a major cause that results in fracture in the neck.
长水口密封碗高温性能好，在开浇后高温下不粉化、不粘附；
Elongated nozzle sealing bowl has better resistance to high temperature. There is no pulverization and no adhesion after casting.
长水口是实现钢水无氧化浇注的重要元件，在使用过程中常常因为热机械应力过大而损坏。
Shroud is an important component for non-oxidation casting of steel. Thermomechanical stress is a major cause that results in its damage.
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