PIG IRON FOR RAPIDLY WEARING PARTS Russian patent published in 1994 - IPC

FIELD: mechanical engineering. SUBSTANCE: pig iron for a rapidly wearing support of a turbodrill contains (mass % ): 2.6-2.9 C, 17- 19 Cr, 0.3-0.8 Si, 1.0-1.5 Mn, 0.8-1.0 Ni, 0.4-0.6 V, 0.4-0.6 Mo, 0.05-0.1 Ti, and iron the remainder. The pig iron undergoes complex treating with a melt (mass % ): 30- 80 CaF₂, 0.5-30 Li₂CO₃, 5-50 Fe₂O₃, 40 CaO, that constitutes 3- 5% of the melt mass. After removing oxidized slag the melt is desulfonated by adding mass % 0.05-0.1 ferrocerium. A modifying is carried out by using a mixture which contains (mass % ): 0.6-2.1 Bi, 3-24 Al, 3- 30 B, and SiCa the remainder. Total amount of the mixture is 0.3% of the melt mass. A heat treating is performed by hardening from 1150and tempering at 200- 250. An article undergoes a heat treating which includes annealing at 1150during 2 h and subsequent cooling at a rate no more than 20 deg/h at an interval 680-550 . EFFECT: enhanced operation characteristics and longevity of the pig iron article. 6 tbl