In view of the instability of Ds inclusion control of class I axle steel in European standard,the scanning energy spectrum analysis of the excessive DS inclusion in axle billet and axle is carried out,and the formation mechanism and influencing factors are studied and analyzed,and the control measures of Ds inclusion of axle steel are put forward.The results show that the Ds inclusions in axle billet and axle are mainly calcium aluminate,containing a small amount of spinel and CaS,which is the endogenous inclusion in steel.Through the stable control of calcium treatment,the oxygen content at the end point is controlled below 0.02%,the alkali of slag is controlled at 3.0～6.0,the CaO/Al2O3 is controlled at 1.2～2.0,the aluminum loss of RH refining process is within 20%,and the aluminum loss of the middle package is controlled within 30×10-6,which can effectively realize the stability control of the excessive DS inclusion of axle steel.
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