Controlling of Nitrogen Content in 40CrB Steel Smelting Process
ZHENG Guiyun
ZHAI Zhenglong
LIANG Na
SUN Yongxi
Abstract：Taking the smelting process of producing 40CrB steel in Laiwu Steel’s 50 t electric furnace line as research object, the nitrogen content change of boron steel in smelting process was analyzed. The results showed that the nitrogen content is first decreased and then increased and then decreased trend to increase. In smelting process, the nitrogen content is lowest in the end of EAF and is highest in the billet. VD treatment is propitious to decrease the nitrogen content. From EAF tapping to the refining stage, the nitrogen content increases most obviously and secondly in continuous casting stage. By controlling the mix population of liquid iron (or pig iron), the amount of refining slag, the operation of VD furnace and protective casting, the nitrogen content would be controlled below 50×10-6.
Keywords：boron steel40CrB steelsmelting processnitrogen content control
Publication Date：2013-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：3( 15-17 )