莱钢热轧生产线半连轧工艺改造

Transformation of Semi-tandem Rolling Process in the Rolling Line at Laigang

莱钢特钢厂热轧生产线采用横列式布置,设备装备与工艺技术水平落后,生产出的合金钢大棒材尺寸精度低,尺寸废品率高。通过对轧线Ф650mm×1/Ф550mm×1/Ф550mm×4进行半连轧布置、精轧机组应用高刚度轧机等改造,提高了合金钢大棒的尺寸精度,使尺寸废品率从0.6%降低到0.25%。

The hot wiling line in the Special Steel of Lalgang used open-train mills, which equipment and technical level is behindhancl and the size precision of big alloy steel bar produced is low and the size defective index is high. Therefore, the transformatian was carried out, that is, the wiling line of φ650mm×1/φ550mm×1/×550mm×4 is disposed to semi-tandem wiling and high rigidity wiling mills is used for finish wiling etc, so the size precision of the products is increased and the size defective index is reduced to 0.25% from 0.6%.