PROCEDE DE FABRICATION D'ACIERS A USINABILITE ET A PROPRIETES MECANIQUES AMELIOREES SIMULTANEMENT

摘要

The machinability and mechanical properties of a steel are simultaneously improved by adding to the molten steel a sodium oxysulphide and one or more of selenium, tellurium and bismuth. The oxysulphide is suitably introduced into the ladle and the selenium, tellurium and bismuth into the molten steel when it is in the ingot mould.