TRIAL PRODUCTION OF 22MnTiBREE GEAR STEEL BY LARGE CONVERTERS

The 22MnTiBRE gear steel produced by large converters and its associated production process and material properties are briefly introduced in this paper. The steel liquld is purified through an addition of 200kg/heat calcium deoxidizer to the ladle before tapping and feeding of aluminium wire and complex packed wire containing Ca,Ba,RE,Si,C and F after tapping.Besides,the method of hanging the RE rod and bright agent is adopted consequently,problems involved in the production of this steel by large converter have been solved,resulting in lower oxygen content in the steel liquid more consistent composition of steel liquid and large ingot,less finishing work and improved upsetting property of the steel. And gear steel with small variation in hardenability,fine grain and good cleaniness has been produced.