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针对中小断面方坯侧分水口浇铸技术,以实际180 mm×240 mm断面方坯连铸结晶器为原型,基于相似原理,采用1:1的物理模型,比较了直通型和侧分旋流型水口浇注时在不同拉速和浸入深度下的结晶器内自由表面流速和渣层状态。结果表明:相同的浸入深度和拉速下,旋流型水口浇注时结晶器内各测点表面流速比直通型水口大;在实验条件下,直通型水口表面流速为0.010~0.023 m/s,旋流型水口为0.010~0.055 m/s,拉速和浸入深度对旋流型水口表面流速的影响较直通型水口显著;此外,采用旋流水口时结晶器的渣层波动要比采用直通型水口时频繁,拉速1.0 m/min、浸入深度120 mm时,其渣层波动适宜,钢渣界面活跃且无卷渣和裸钢现象发生,此时两测点的表面流速分别为0.028和0.032 m/s,是较适宜的工艺条件。
Aimed at the billet side dimple casting technology of small and medium section, taking the actual 180 mm × 240 mm section billet continuous casting mold as the prototype, based on the similar principle, a 1: 1 physical model was used to compare the straight through and side swirling Free surface flow rate and slag status in the mold at different casting speeds and immersion depths at nozzle pouring. The results show that under the same immersion depth and pulling speed, the flow velocity at each measuring point in the mold during the pouring of the swirling nozzle is larger than that of the through-flow nozzle. Under the experimental conditions, the flow velocity of the through-flow nozzle is 0.010 ~ 0.023 m / s, Swirl nozzle is 0.010 ~ 0.055 m / s, pull speed and depth of immersion on the surface of the swirl flow velocity than the straight through the nozzle significantly; In addition, the use of swirl nozzle crystallizer slag layer fluctuations than the straight through When the nozzle was frequently used, the pulling speed was 1.0 m / min and the immersion depth was 120 mm, the slag layer fluctuated properly, the interface of the steel slag was active and no slag-laden and bare steel occurred. The surface velocities of the two measuring points were 0.028 and 0.032 m / s, is more appropriate process conditions.