Free machining steel with bismuth and manganese sulfide

Details Free machining steel with bismuth and manganese sulfide Free machining steel with bismuth and manganese sulfide

C - Chemistry, Metallurgy

22

C

75/150, 75/1.2

C22C 38/60 (2006.01) C22C 38/00 (2006.01)

Patent

CA 1156068

ABSTRACT A free machining cast steel shape has in its micro- structure, both bismuth-containing inclusions and manganese sulfide inclusions. The manganese sulfide inclusions act as microcrack initiators, and the bismuth-containing inclusions act as liquid metal embrittlers, propagating the microcracks. The mean size and spacing of the manganese-sulfide inclusions are controlled.

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