摘要
对微氮合金生产的HRB400热轧带肋钢筋屈服强度不合格样品进行分析,通过对比样品成分与气体分析,结合金相组织以及析出相扫描电镜分析和物理化学相分析,屈服强度不合格的主要原因是钢材中全氧含量高,造成析出相围绕夹杂物长大,微氮合金未发挥作用,建议采取严格转炉终点控制管理、优化出钢工艺、强化吹氩及适当降低轧制加热和开轧温度等改进措施。
The yield strength disqualification simples from HRB400 hot-rolled ribbed steel bar produced by micro-nitrogen alloying were made analysis. By comparing the chemical composition and gas composition analysis, combining the metallographic structure, SEM analysis of precipitated phase and physicochemical phase analysis, the main causes of the yield strength disqualification are the high total oxygen content in the steel, which caused the precipitated phase grow up round the inclusions. The micro-nitrogen alloy did not play a role. The authors put forward proposals： strict the end-point control of the converter, optimizing hot metal tapping process, strengthening argon blowing effect, decreasing the heating temperature and rolling temperature and other measures.
出处
《山东冶金》
CAS
2012年第2期36-38,共3页
Shandong Metallurgy
