圆坯连铸铸坯抖动原因分析及改进措施

Cause Analysis and Improvement Measures on Round Billet Continuous Casting Slab Jitter

结合实际情况分析了铸坯抖动的主要原因及其改进措施。研究表明,铸坯在二冷室中抖动是由设备精度差和结晶器铜管锥度过大两个方面原因造成。当生产20号、16Mn、37Mn5等坯壳较软、塑性变形较容易的钢种时不会发生抖动或者抖动幅度较轻,但生产40Mn2、26CrMo、27CrMo44等具有较高强度和硬度的钢种时发生严重抖动,使用较低黏度、低熔点的保护渣后,润滑性能增加,铸坯抖动明显减小,但始终未能根除。

In this investigationcauses for casting billet jitter were analyzed and improvement measures were proposed under the consideration of actual situation. Result shows that, in two strand cold chamber the jitter is due to equipment preci- sion and overlarge taper of the crystallizer copper tube. For the production of No. 20, 16Mn, 37Mn5 shell which is relatively soft and ductile, jitter does not occur or only slight jitter occurs; but for the production of 40Mn2, 26CrMo, 27CrMo44 which have higher strength and hardness, severe wobble occurs. The using of low viscosity, low melting slag can increase lubrication performance and reduce billet jitter obviously, but fails to eradicate jitter.