INFLUENCE OF MICRO-SEGREGATION IN PB-S-ALLOYED FREE MACHINING STEELS ON THE SURFACE QUALITY OF THE ROLLED WIRE-ROD

  • U. Leuschke
  • N. Rajesh Puvvada
  • Rajesh Puvvada

Abstract

Free machining steel billets were manufactured at the continuous casting machine. The manufactured billets did not exhibit any kind of surface defects but surface cracks and slivers appeared when the billets were rolled into wires and rods at the wire-rod mill. The defects on rolled wire-rod have been detected by a hot eddy current system. Further investigations in these defects with the help of microprobe analysis system and scanning electron microscope equipped with image analysis system revealed micro-segregation of the elements manganese, sulphur and phosphorous in the interdendritic zones.
Published
2008-05-29
Section
Memorie