摘要
针对高碳钢SWRH82B盘条冬季生产中时效时间较长的问题,试验研究了SWRH82B盘条断面收缩率与自然时效时间的关系。结果表明:高碳钢SWRH82B盘条断面收缩率主要受其氢含量的影响,随着时效时间的延长氢质量分数持续降低,断面收缩率逐渐升高。-25~-20℃温度下,盘条时效15~17 d,氢质量分数降至0.24×10^(-6)时,断面收缩率升高至28%,随着时效时间的延长,氢质量分数及断面收缩率变化趋于平缓。提高时效温度、延长时效时间,可以减少盘条中的氢含量。为此,对SWRH82B盘条控冷工艺进行优化,将辊道速度由0.70 m/s控制为0.80 m/s,1号~3号风机开口100%,4号~6号风机开口90%,7号~10号风机开口70%,其他位置风机关闭,利用盘条相变后余热进行缓冷,实现了在线时效,时效时间可缩短至4 d,提高了生产效率。
In view of the problem of long natural aging time in the production of high carbon steel SWRH82B wire rod in winter,the relationship between the reduction of area of SWRH82B wire rod and natural aging time was investigated.The results show that the reduction of area of high carbon steel SWRH82B wire rod is mainly affected by its hydrogen content.With the extension of aging time,the hydrogen mass fraction continues to decrease,and the reduction of area gradually increases.When the temperature is between-25℃and-20℃,the wire rod is aged for 15-17 d and the hydrogen mass fraction is reduced to 0.24×10^(-6),the reduction of area increases to 28%.With extension of aging time,the change of hydrogen mass fraction and reduction of area tends to stabilize.Improving the aging temperature and extending the aging time can reduce hydrogen content in the wire rod.In this regard,the cooling process of SWRH82B wire rod is optimized,and the roller table speed is controlled from 0.70 m/s to 0.80 m/s,the opening of fan No.1-No.3 is 100%,the opening of fan No.4-No.6 is 90%,the opening of fan No.7-No.10 is 70%,and the fans at other positions are closed,and the wire rod is slowly cooled by the residual heat after phase transformation,which realizes online aging,and the aging time can be shortened to 4 d,which improves the production efficiency.
作者
曹树卫
李文武
王鲁义
CAO Shuwei;LI Wenwu;WANG Luyi(Jiangsu Yonggang Group Co.,Ltd.,Zhangjiagang 215628,China)
出处
《轧钢》
北大核心
2025年第2期156-160,共5页
Steel Rolling
