METHOD OF STEEL PIECES SURFACE HARDENING Russian patent published in 1996 - IPC

FIELD: method is used ib chemical-thermal treatment of metals. SUBSTANCE: steel piece surface is heated by electrical short arc of reverse polarity carbon electrode and then it is cooled to temperature o-f phase transformations. Pressure is created till plastic deformation takes place in parallel on two limiting side rolls of heating seam by separate tool. So steel saturation with carbon, plastic deformation and hardening with increase of piece wearability are realized due to increase of surface firmness and decrease of roughness. EFFECT: increased piece wearability, its surface firmness, decreased its surface roughness. 2 cl, 2 dwg, 1 tbl