Abstract
The inclusions in ultra-low oxygen spring steel during process were studied. Sufficient aluminium was used during tapping. The refining slag has high basicity and strong reducibility. The total oxygen is only 10×10-6 in billet and the oxide inclusions in the steel have finished the transformation during refining and some complex oxide inclusions are easy to remove at steelmaking temperature. Residual oxide inclusions in the steel are CaO-MgO-Al2O3 complex inclusions with a relatively lower melting point, which have a little deform-ability during hot-working and can improve the fatigue properties of high speed wheel steel effectively.
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