In order to study the effect of tellurium on sulfide morphology of non-quenched and tempered steel 38MnVS6 for automobile crankshaft

0.012% Te is added by feeding 70 m Mn-Te wire in the smelting process to achieve the purpose of tellurium treatment. The nonmetallic inclusions in Φ380 mm continuous casting round bloom and Φ105 mm hot rolling round bar are studied by metallographic microscope and scanning electron microscope. Through the research

it is found that the morphology of sulfide is the same in the transverse and longitudinal direction of continuous casting bloom. MnS and MnTe form eutectic compounds

and the existence of MnTe changes the precipitation morphology of MnS

which can make the sulfide morphology change to short rod or even ellipsoid

and the overall length and size become smaller performance to reduce average  length from 45 μm to 15 μm.Affer adding0.012%Te

MnTe and MnS inclusions occur solid solution

and the morphology of inclusions is very similar in both size and morphology in bloom and rolled bar

while the sulfide in rolled bar without Te treatment is obviously elongated with the rolling direction.