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冷轧双相钢氧化色与钢种内部Mn元素的选择性氧化现象相伴而生,氧化色严重的带钢表现出不同的电化学特性,耐蚀性较差。Mn元素的选择性氧化与闪冷段冷却风机位置氧含量密切相关,带钢出水淬槽后水的轻微残留更容易加速腐蚀反应从而加重氧化色。通过炉区退火模拟实验,验证氧含量对带钢表面状态的影响。氧含量较高时,可在带钢表面发现明显的氧化物颗粒。采用高H2冷却模式可以提高混合气体换热系数,减小冷却风机与带钢距离可明显降低冷却风机功率,减轻Mn元素在带钢表面的氧化富集,配合优化淬水槽挤干效果,可良好解决带钢表面氧化色问题。
The oxidation of the cold-rolled duplex steel is accompanied by the selective oxidation of Mn within the steel. Strips of severe oxidation color show different electrochemical properties and poor corrosion resistance. The selective oxidation of Mn element is closely related to the oxygen content of the fan at the cooling section of the flash cooling section. The slight residual water after the quenching tank of the steel strip is more likely to accelerate the corrosion reaction and thus increase the oxidation color. Through the furnace zone annealing simulation experiment, the effect of oxygen content on the surface condition of the strip steel was verified. High oxygen content, the surface of the strip can be found in the obvious oxide particles. The high H2 cooling mode can increase the heat transfer coefficient of the mixed gas. Reducing the distance between the cooling fan and the steel strip can obviously reduce the power of the cooling fan, and reduce the oxidation and enrichment of Mn on the surface of the steel strip. Solve the strip surface oxidation of color problems.