摘要
采用低碳、高锰、Nb-V-Ti微合金化工艺,成功开发出屈服强度为400 MPa以上,-40℃冲击功为25 J以上的耐低温高强门架型钢。针对生产过程中在型钢腹板出现的裂纹,分析出其产生原因是钢中的碳含量靠近亚包晶钢碳质量分数的下限,包晶转变率高,高温相变收缩程度大,通过将碳含量提高至0.13%左右,有效降低了铸坯裂纹的产生。
Low temperature resistant high strength gantry steel with over 400 MPa yield strength and more than 25 J impact energy at-40 ℃ was successfully developed with low carbon high manganese Nb-V-Ti micro alloying process. Aiming at the crack occurring at the web of the section during production, the reason was analyzed as carbon content in steel close to the lower limit of carbon mass fraction of hypo peritectic steel with high peritectic transformation ratio and big contraction at high temperature phase. By increasing carbon content to about 0.13%, the formation of slab crack was able to reduced effectively.
出处
《天津冶金》
CAS
2016年第1期25-27,共3页
Tianjin Metallurgy
