摘要
为降低板坯低合金高强度结构钢Q345C的成本,进行了优化Q345C成分设计试验。根据各元素对强度的贡献值及合金成本,降低钢中锰含量0.30%左右;加入微合金元素钒,使钢中钒含量控制在0.025%~0.035%;钢中铝含量不再做要求,减少钙铁线的喂入量。结果表明：该成分体系能够降低钢中有害元素P、S的含量;能够改善铸坯中心偏析,铸坯角部未发现裂纹;冲击韧性和延展性有所提高,抗拉强度和屈服强度稍低于优化前的Q345C钢,钢板力学性能满足国标要求;晶粒度与优化前相比差别不明显,带状组织有所减轻,优化成分设计后吨钢合金成本降低了5.3~8.0元。
In order to reduce the cost of high- strength low alloy steel Q345 C slab,this paper carried out an experiment to optimize the composition of Q345 C. According to the contribution of each element to the strength and the cost of the alloy,the manganese content in steel decreased by 0. 30%,added micro alloying element vanadium into the steel,the content of vanadium in steel is controlled in 0. 025% ~ 0. 035%,the aluminum content in the steel is no longer required,the feeding amount of calcium iron wire was reduced. The results show that the composition system can reduce the content of harmful elements P and S in steel,can improve the center segregation of casting slab,no cracks are found in the corner of the slab,the mechanical properties of steel plate meet the requirements of the national standard,strength is slightly lower than the original steel Q345 C,but impact toughness and ductility is better; grain size and compared to the original did not have significant differences,banded structure eased. the cost of alloy reduces 5. 3 ~ 8. 0 yuan per ton steel.
出处
《河南冶金》
2016年第3期23-27,共5页
Henan Metallurgy
