High-hardness martensitic cast steel concaves for primary gyratory crushers

CIM Bulletin, Vol. 86, No. 975, 1993

James L. Parks and David M. Kjos, M E International, Minneapolis, Minnesota

Designs, installation procedures and performance characteristics of martensitic cast steel concaves are reviewed. Longer wear life, fewer pieces to install and eliminating the need to scarf joints are the principal benefits of using martensitic steel to replace austenitic 12% Mn (Hadfield's) steel, the traditional concave material for large gyratory crushers. Installation procedures that reduce the risk of breakage are described. Operating practices that affect concave performance are also discussed.