摘要
采用连铸坯轧材,直线型裂纹、耳子、三角口裂纹和结疤为主要的表面缺陷,裂纹数量随连浇过程的继续呈减少趋势,耳子和折叠数量随规格的增大而减少。连浇操作、中间包烘烤及水口质量是影响连铸坯表面质量的主要因素;限制轧制最大规格,可防止因连铸坯表面缺陷带来的危害进一步扩大。加强中间包预热,采用液面自动控制,规范清除渣圈的操作,可使各钢类裂纹总量减少41%。
Main surface defects appeared in bar rolled with continuously casting slab are linear cracks,ears,triangle cracks and scabs.The amounts of the cracks have decreasing trend with the increase of continuous heats.The amounts of ears and shuts decrease with the aggrandizement of bar specification.The operation in continuously casting,tundish baking and the quality of nozzle are the main factors that inflect the surface quality of the slab.Limiting roll for the maximum size can prevent the harm brought by surface defects of the slab from further expansion.Through strengthening tundish preheating,adopting liquid level automatic control technique and standardizing the operation of clean residue rings,the amounts of total cracks decrease by 41%.
出处
《山东冶金》
CAS
2011年第2期45-48,共4页
Shandong Metallurgy
关键词
特殊钢棒材
表面缺陷
分布
直线型裂纹
special steel bars
surface defects
distribution
linear crack