摘要
为了考察某中厚板厂板坯堆冷工艺过程中氢元素的去除效果,最终达到防止白点、提高探伤合格率的目的,依据菲克第二定律非稳态传质方程,以8块断面为250mm×1 600mm板坯为研究对象,利用有限元软件ABAQUS建立了中厚板铸坯堆冷过程二维氢扩散模型。计算结果表明,利用相变时的除氢峰效应,对连铸坯进行堆冷是一个很有力的除氢措施。在堆冷条件合理的情况下,下线连铸坯在堆冷24~48h后除氢率高达84.6%。如果以平均w(H)等于0.000 1%为防止产生"白点"的判断标准,则堆冷24h后可认为铸坯w(H)已处于安全范围;如果以最大w(H)等于0.000 1%为防止产生"白点"的判断标准,则堆垛36h后认为铸坯w(H)已完全处于安全范围。
In order to investigate the removal effect of hydrogen element in the slab slow cooling process of a medium plate plant,and finally to prevent the occurrence of white spots and improve the qualified rate of flaw detection,eight slabs with 250 mm×1 600 mm cross section were selected as the research objects according to the Fick′s second law unsteady mass transfer equation,and a two-dimensional hydrogen diffusion model for the stacking slowcooling process of medium and heavy slabs was established using the software ABAQUS.The calculation results show that the stacking slow-cooling of continuous casting slab is a powerful dehydrogenation measure by utilizing the dehydrogenation peak effect during phase transformation.After 24 to 48 hof the stacking cooling,the dehydrogenation rate of off-line continuous casting slab can reach over 84.6% when the stacking slow-cooling conditions are reasonable.If the average w(H)=0.000 1%is taken as the criterion to prevent the occurrence of " white spots",the hydrogen content in the slab can be considered to be in the safe range after 24 hof stacking cooling.If the maximum w(H)= 0.000 1%is taken as the criterion to prevent the occurrence of " white spots",the w(H)in the slab is considered to be in the safe range after 36 hof stacking.
作者
王卫华
李战军
初仁生
陈霞
WANG Wei-hua;LI Zhan-jun;CHU Ren-sheng;CHEN Xia(Research Institute of Technology,Shougang Group Co.,Ltd.,Beijing 100043,China;Beijing Key laboratory of Green Recyclable Process for Iron and Steel Production Technology,Beijing 100043,China)
出处
《钢铁》
CAS
CSCD
北大核心
2019年第11期49-55,共7页
Iron and Steel
关键词
堆垛
缓冷
氢扩散
有限元
模型
stacking
slow-cooling
hydrogen diffusion
finite element
model
