The invention generally relates to a process for the preparation of water-absorbent polymer particles, comprising the process steps of (i) preparing an aqueous monomer solution comprising at least one partially neutralized, monoethylenically unsaturated monomer bearing carboxylic acid groups (α1) and at least one crosslinker (α3) (ii) optionally adding fine particles of a water-absorbent polymer (iii) adding a polymerization initiator or a at least one component of a polymerization initiator system that comprises two or more components (iv) optionally decreasing the oxygen content of the aqueous monomer solution (v) charging the aqueous monomer solution into a polymerization reactor (vi) polymerizing the monomers in the aqueous monomer solution in the polymerization reactor, thereby obtaining a polymer gel (vii) discharging the polymer gel out of the polymerization reactor and prior or after the discharging comminuting the polymer gel by a comminuting device, thereby obtaining polymer gel particles (viii) drying the polymer gel particles (ix) grinding the dried polymer gel particles thereby obtaining water-absorbent polymer particles (x) sizing the grinded water-absorbent polymer particles and (xi) optionally treating the surface of the grinded and sized water-absorbent polymer particles wherein the comminuting device comprises a rotating component, comprising a component steel, comprising alloying elements in specific amounts.De manière générale, linvention concerne un procédé de préparation de particules polymères absorbant leau, comprenant les étapes de procédé (i) de préparation dune solution aqueuse de monomères comprenant au moins un monomère à insaturation monoéthylénique partiellement neutralisé, portant des groupes acide carboxylique (alpha 1) et au moins un agent de réticulation (alpha 3) (ii) éventuellement laddition de fines particules dun polymère absorbant leau (iii) lajout dun initiateur de polymérisation ou dun au moins un constituant dun système i
