... sleeves ,sealing ring, sliding sleeve Industrial machineries axis sleeve, gear, kawa, wear-resistant sleeve, grinding sleeve Oil drillingdrillable packers/drillable bridge ... density molten iron will sink, and then through U type channel bottom-up into the mold, so there ... flake graphite (external layer is small D-type graphite, internal is small A-type graphite small) Matrix structure: ferrite + ...