Study on the Control of Cleanliness for HSLA Steel in Smelting Process
In the current paper,the control methed for cleanliness in smelting process was analyzed for the evolution of non-metallic inclusions and related changes of composition in steel.The size,composition and the type of the non-metallic inclusions in HSLA steel were analyzed by aspex explorer automated scanning electron microscope in the steelmaking process for Pretreatment of hot metal → LD → LF refining → RH refining → Calcium treatment → CC.The results show that in the composition of the non-metallic inclusions,most of them were composed by the calcium aluminate and CaS.The others are complex-type non-metallic inclusions that the spinels are the core with the peripheral parcels for calcium aluminate inclusions.For the size of the non-metallic inclusions,the non-metallic inclusions larger than 100μm are converted to less than 10μm based small size non-metallic inclusions.The S content of the steel decrease from 0.012% to 0.0012% or less,while Al content is kept between 0.025% to 0.035% and the quality for the casting slab satisfies the requirement of the steel.The control strategy for the inclusions is small size,diffuse distribution and little amount of deformation after rolling.
high strength low alloy steel nonmetallic inclusions control strategy
CHU Rensheng LIU Jingang LI Zhanjun
Shougang Research Institute of Technology, Beijing 100043, China
国际会议
成都
英文
539-542
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）