摘要
2016年,由含硼热轧低碳SPHC钢板冷轧的钢带边部出现大量裂纹。对SPHC钢进行了连续冷却转变试验及现场试验,发现SPHC钢带边部开裂是由于其精轧温度低于钢的相变温度,产生了先共析铁素体,甚至出现纤维状组织所致。据此采取了一些预防措施:优化温度等除鳞工艺参数,减少粗轧和精轧的除鳞道次,使终轧温度从878℃提高到888℃以上、卷取温度从620℃提高到660℃。结果,钢带边部组织由纤维状改善为粗晶组织,解决了钢带边部开裂问题。
A large amount of cracks appeared on the edge of hot-rolled boron-containing low-carbon SPHC steel strip during cold rolling in 2016. The SPHC steel was subjected to continuous cooling transformation test as well as field test. From these tests it was found that edge cracking of the SPHC steel strip was attributed to its precision rolling temperature lower than transformation temperature and therefore forming proeutectoid ferrite, even forming a fibre structure. In view of the above, some precautions, among which were: optimizing descaling process parameters such as temperature, decreasing descaling passes during rough rolling and finish rolling, increasing the finish-rolling temperature from 878 ℃ to above 888 ℃, and increasing the coiling temperature from 620 ℃ to 660 ℃, were adopted. As a result, fibre structure on the steel strip edge was improved to a coarse-grained structure, thus removing the problem of edge cracking of steel strip.
作者
夏小明
裴新华
黄绪传
廖松林
王进
XIA Xiaoming;PEI Xinhua;HUANG Xuchuan;LIAO Songlin;WANG Jin(Hot Strip Mill of Shanghai Meishan Iron & Steel Co., Ltd., Nanjing Jiangsu 210039, China;Technology Center of Shanghai Meishan Iron & Steel Co., Ltd., Nanjing Jiangsu 210039, China)
出处
《上海金属》
CAS
北大核心
2019年第4期7-11,共5页
Shanghai Metals
关键词
含硼低碳钢
冷轧
边部开裂
预防措施
boron-containing low-carbon steel
cold-rolling
edge cracking
precaution
