GCr15 high carbon chromium bearing steel on-line rapid spheroidizing annealing technology

A GCr15 high carbon chromium bearing steel on-line rapid spheroidizing annealing technology belongs to the field of material engineering. The GCr15 high carbon chromium bearing steel comprises, by mass, 0.95-1.05% of C, 1.30-1.65% of Cr, 0.20-0.40% of Mn, 0.15-0.35% of Si, S<=0.015%, P<=0.02%, and the balance Fe. The technology comprises the following steps: heating to 1150-1250 DEG C along with the furnace temperature and keeping the temperature; rapidly cooling to 920-960 DEG C and applying stress to generate 40-60% of compression deformation; then rapidly cooling to 740-780 DEG C and generating 30-50% of compression deformation; then slowly cooling to 500-600 DEG C at a cooling speed of 0.3-0.5 DEG C/s; and finally rapidly cooling to room temperature. The technology is simple, after thermal deformation, the hot-rolled workpiece has the microstructure that fine uniform spherical carbides are dispersively distributed on ferrite matrix and is suitable for subsequent processing, and microstructure preparation work is provided for final quenching and tempering.