摘要
分析发现，结晶器单Ni镀层硬度低，新镀层铜板初次使用容易引起开浇漏钢，使用Co—Ni镀层后，黏结和开浇漏钢得到明显控制；结晶器缓冷有利于改善铸坯纵裂，通过减少铜板水槽深度，提高铜板表面温度，纵裂纹发生率从0.065％降到0．0079％；不同材质镀层的硬度、耐磨性、热膨胀系数等性能差异较大，采用Co：Ni=1：9的镀层可以提高耐磨性，防止剥落，镀层一次使用寿命可以达到2500～3000炉。宝钢通过减少结晶器周边设备故障，提高操作水平，结晶器铜板综合使用寿命由200～300炉提高到400～500炉。
Analytical results indicate that hardness of the mould with pure Ni-eoating was poor. The new Ni-coated copper plate would apt to cause breakout when it was in the initial use. When the Co-Ni-coated copper plate was adopted, the incidents of sticking and breakout were reduced obviously. The slow cooling of the mould helped decrease slab＇ s longitudinal cracks. With reduction of the copper plate slot＇ s depth, the slab＇ s surface temperature was raised,and the rate of slab＇s longitudinal cracks was decreased from 0. 065% to 0. 007 9%. Different coating stuff would cause great difference in the coating＇ s hardness, wearproof performance and coefficient of the heat expansion. Supposing the copper plate＇ s coating is Co： Ni = 1 ： 9, the wearproof performance can be improved and the flaking can be prevented. The coating＇ s lifetime could reach 2 500 - 3 000 heats. As the operation has been perfected, the equipment failures around the mould were reduced. The comprehensive lifetime of the moulds＇ copper plates increased from 200 - 300 heats to 400 - 500 heats.
出处
《宝钢技术》
CAS
2008年第4期59-62,共4页
Baosteel Technology
关键词
结晶器
连铸坯
镀层
裂纹
mould
continuously cast slab
coating
crack
