Armstrong, Nikaido, Marmelstein & Kubovcik
Free cutting steel
 Sulfur-containing free-cutting steel may have an improved machinability and fewer defects by adding certain amounts of Te, Pb and Bi to prevent elongation of sulfide inclusion particles, and by lowering Al-content to decrease Al.sub.2 O.sub.3 of oxide inclusions or by lowering O-content to decrease large Al.sub.2 O.sub.3 inclusion particles. The free-cutting steel may be produced by continuous casting. 
Daido Tokushuko Kabushiki Kaisha
C
C22C
inventional
Sadayuki Atsuyoshi Makoto
Nakamura Kimura Saito